Merge remote-tracking branch 'jgallagher/master' into tail

# Conflicts:
#	src/inner_connection.rs
#	src/lib.rs

.travis.yml

@@ -26,22 +26,23 @@ script:
   - cargo build
   - cargo build --features bundled
   - cargo build --features sqlcipher
+  - cargo build --features "bundled sqlcipher"
   - cargo test
-  - cargo test --features backup
+  - cargo test --features "backup blob"
-  - cargo test --features blob
+  - cargo test --features "collation functions"
-  - cargo test --features functions
+  - cargo test --features "hooks limits"
-  - cargo test --features hooks
-  - cargo test --features limits
   - cargo test --features load_extension
   - cargo test --features trace
   - cargo test --features chrono
   - cargo test --features serde_json
+  - cargo test --features url
   - cargo test --features bundled
   - cargo test --features sqlcipher
   - cargo test --features i128_blob
-  - cargo test --features "unlock_notify bundled"
+  - cargo test --features uuid
-  - cargo test --features "array bundled csvtab vtab"
+  - cargo test --features "bundled unlock_notify window"
-  - cargo test --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab"
+  - cargo test --features "array bundled csvtab series vtab"
-  - cargo test --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab buildtime_bindgen"
+  - cargo test --features "backup blob chrono collation csvtab functions hooks limits load_extension serde_json trace url uuid vtab"
-  - cargo test --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab bundled"
+  - cargo test --features "backup blob chrono collation csvtab functions hooks limits load_extension serde_json trace url uuid vtab buildtime_bindgen"
-  - cargo test --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab bundled buildtime_bindgen"
+  - cargo test --features "backup blob chrono collation csvtab functions hooks limits load_extension serde_json trace url uuid vtab bundled"
+  - cargo test --features "backup blob chrono collation csvtab functions hooks limits load_extension serde_json trace url uuid vtab bundled buildtime_bindgen"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rusqlite"
-version = "0.16.0"
+version = "0.20.0"
 authors = ["John Gallagher <jgallagher@bignerdranch.com>"]
 edition = "2018"
 description = "Ergonomic wrapper for SQLite"
@@ -28,6 +28,7 @@ load_extension = []
 backup = ["libsqlite3-sys/min_sqlite_version_3_6_23"]
 # sqlite3_blob_reopen: 3.7.4
 blob = ["libsqlite3-sys/min_sqlite_version_3_7_7"]
+collation = []
 # sqlite3_create_function_v2: 3.7.3 (2010-10-08)
 functions = ["libsqlite3-sys/min_sqlite_version_3_7_7"]
 # sqlite3_log: 3.6.23 (2010-03-09)
@@ -47,7 +48,12 @@ csvtab = ["csv", "vtab"]
 # pointer passing interfaces: 3.20.0
 array = ["vtab"]
 # session extension: 3.13.0
-session = ["libsqlite3-sys/session", "hooks", "fallible-streaming-iterator"]
+session = ["libsqlite3-sys/session", "hooks"]
+# window functions: 3.25.0
+window = ["functions"]
+# 3.9.0
+series = ["vtab"]
+
 
 [dependencies]
 time = "0.1.0"
@@ -56,18 +62,24 @@ lru-cache = "0.1"
 chrono = { version = "0.4", optional = true }
 serde_json = { version = "1.0", optional = true }
 csv = { version = "1.0", optional = true }
+url = { version = "2.0", optional = true }
 lazy_static = { version = "1.0", optional = true }
 byteorder = { version = "1.2", features = ["i128"], optional = true }
-fallible-streaming-iterator = { version = "0.1", optional = true }
+fallible-iterator = "0.2"
+fallible-streaming-iterator = "0.1"
+memchr = "2.2.0"
+uuid = { version = "0.7", optional = true }
 
 [dev-dependencies]
 tempdir = "0.3"
 lazy_static = "1.0"
 regex = "1.0"
+uuid = { version = "0.7", features = ["v4"] }
+unicase = "2.4.0"
 
 [dependencies.libsqlite3-sys]
 path = "libsqlite3-sys"
-version = "0.12"
+version = "0.16"
 
 [[test]]
 name = "config_log"
@@ -80,7 +92,7 @@ name = "deny_single_threaded_sqlite_config"
 name = "vtab"
 
 [package.metadata.docs.rs]
-features = [ "backup", "blob", "chrono", "functions", "limits", "load_extension", "serde_json", "trace", "vtab" ]
+features = [ "backup", "blob", "chrono", "collation", "functions", "limits", "load_extension", "serde_json", "trace", "url", "vtab", "window" ]
 all-features = false
 no-default-features = true
 default-target = "x86_64-unknown-linux-gnu"

README.md

@@ -11,7 +11,7 @@ an interface similar to [rust-postgres](https://github.com/sfackler/rust-postgre
 
 ```rust
 use rusqlite::types::ToSql;
-use rusqlite::{Connection, NO_PARAMS};
+use rusqlite::{Connection, Result, NO_PARAMS};
 use time::Timespec;
 
 #[derive(Debug)]
@@ -22,8 +22,8 @@ struct Person {
     data: Option<Vec<u8>>,
 }
 
-fn main() {
+fn main() -> Result<()> {
-    let conn = Connection::open_in_memory().unwrap();
+    let conn = Connection::open_in_memory()?;
 
     conn.execute(
         "CREATE TABLE person (
@@ -33,7 +33,7 @@ fn main() {
                   data            BLOB
                   )",
         NO_PARAMS,
-    ).unwrap();
+    )?;
     let me = Person {
         id: 0,
         name: "Steven".to_string(),
@@ -44,22 +44,22 @@ fn main() {
         "INSERT INTO person (name, time_created, data)
                   VALUES (?1, ?2, ?3)",
         &[&me.name as &ToSql, &me.time_created, &me.data],
-    ).unwrap();
+    )?;
 
     let mut stmt = conn
-        .prepare("SELECT id, name, time_created, data FROM person")
+        .prepare("SELECT id, name, time_created, data FROM person")?;
-        .unwrap();
     let person_iter = stmt
-        .query_map(NO_PARAMS, |row| Person {
+        .query_map(NO_PARAMS, |row| Ok(Person {
-            id: row.get(0),
+            id: row.get(0)?,
-            name: row.get(1),
+            name: row.get(1)?,
-            time_created: row.get(2),
+            time_created: row.get(2)?,
-            data: row.get(3),
+            data: row.get(3)?,
-        }).unwrap();
+        }))?;
 
     for person in person_iter {
         println!("Found person {:?}", person.unwrap());
     }
+    Ok(())
 }
 ```
 
@@ -74,27 +74,30 @@ newer SQLite version; see details below.
 Rusqlite provides several features that are behind [Cargo
 features](https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section). They are:
 
-* [`load_extension`](https://docs.rs/rusqlite/0.16.0/rusqlite/struct.LoadExtensionGuard.html)
+* [`load_extension`](https://docs.rs/rusqlite/~0/rusqlite/struct.LoadExtensionGuard.html)
   allows loading dynamic library-based SQLite extensions.
-* [`backup`](https://docs.rs/rusqlite/0.16.0/rusqlite/backup/index.html)
+* [`backup`](https://docs.rs/rusqlite/~0/rusqlite/backup/index.html)
   allows use of SQLite's online backup API. Note: This feature requires SQLite 3.6.11 or later.
-* [`functions`](https://docs.rs/rusqlite/0.16.0/rusqlite/functions/index.html)
+* [`functions`](https://docs.rs/rusqlite/~0/rusqlite/functions/index.html)
   allows you to load Rust closures into SQLite connections for use in queries.
   Note: This feature requires SQLite 3.7.3 or later.
-* [`trace`](https://docs.rs/rusqlite/0.16.0/rusqlite/trace/index.html)
+* [`trace`](https://docs.rs/rusqlite/~0/rusqlite/trace/index.html)
   allows hooks into SQLite's tracing and profiling APIs. Note: This feature
   requires SQLite 3.6.23 or later.
-* [`blob`](https://docs.rs/rusqlite/0.16.0/rusqlite/blob/index.html)
+* [`blob`](https://docs.rs/rusqlite/~0/rusqlite/blob/index.html)
   gives `std::io::{Read, Write, Seek}` access to SQL BLOBs. Note: This feature
   requires SQLite 3.7.4 or later.
-* [`limits`](https://docs.rs/rusqlite/0.16.0/rusqlite/struct.Connection.html#method.limit)
+* [`limits`](https://docs.rs/rusqlite/~0/rusqlite/struct.Connection.html#method.limit)
   allows you to set and retrieve SQLite's per connection limits.
-* `chrono` implements [`FromSql`](https://docs.rs/rusqlite/0.16.0/rusqlite/types/trait.FromSql.html)
+* `chrono` implements [`FromSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.FromSql.html)
-  and [`ToSql`](https://docs.rs/rusqlite/0.16.0/rusqlite/types/trait.ToSql.html) for various
+  and [`ToSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.ToSql.html) for various
   types from the [`chrono` crate](https://crates.io/crates/chrono).
-* `serde_json` implements [`FromSql`](https://docs.rs/rusqlite/0.16.0/rusqlite/types/trait.FromSql.html)
+* `serde_json` implements [`FromSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.FromSql.html)
-  and [`ToSql`](https://docs.rs/rusqlite/0.16.0/rusqlite/types/trait.ToSql.html) for the
+  and [`ToSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.ToSql.html) for the
   `Value` type from the [`serde_json` crate](https://crates.io/crates/serde_json).
+* `url` implements [`FromSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.FromSql.html)
+  and [`ToSql`](https://docs.rs/rusqlite/~0/rusqlite/types/trait.ToSql.html) for the
+  `Url` type from the [`url` crate](https://crates.io/crates/url).
 * `bundled` uses a bundled version of sqlite3.  This is a good option for cases where linking to sqlite3 is complicated, such as Windows.
 * `sqlcipher` looks for the SQLCipher library to link against instead of SQLite. This feature is mutually exclusive with `bundled`.
 * `hooks` for [Commit, Rollback](http://sqlite.org/c3ref/commit_hook.html) and [Data Change](http://sqlite.org/c3ref/update_hook.html) notification callbacks.
@@ -103,6 +106,7 @@ features](https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-s
 * [`csvtab`](https://sqlite.org/csv.html), CSV virtual table written in Rust.
 * [`array`](https://sqlite.org/carray.html), The `rarray()` Table-Valued Function.
 * `i128_blob` allows storing values of type `i128` type in SQLite databases. Internally, the data is stored as a 16 byte big-endian blob, with the most significant bit flipped, which allows ordering and comparison between different blobs storing i128s to work as expected.
+* `uuid` allows storing and retrieving `Uuid` values from the [`uuid`](https://docs.rs/uuid/) crate using blobs.
 * [`session`](https://sqlite.org/sessionintro.html), Session module extension.
 
 ## Notes on building rusqlite and libsqlite3-sys
@@ -116,11 +120,11 @@ You can adjust this behavior in a number of ways:
 * If you use the `bundled` feature, `libsqlite3-sys` will use the
   [gcc](https://crates.io/crates/gcc) crate to compile SQLite from source and
   link against that. This source is embedded in the `libsqlite3-sys` crate and
-  is currently SQLite 3.26.0 (as of `rusqlite` 0.16.0 / `libsqlite3-sys`
+  is currently SQLite 3.29.0 (as of `rusqlite` 0.20.0 / `libsqlite3-sys`
-  0.11.0).  This is probably the simplest solution to any build problems. You can enable this by adding the following in your `Cargo.toml` file:
+  0.16.0).  This is probably the simplest solution to any build problems. You can enable this by adding the following in your `Cargo.toml` file:
   ```
   [dependencies.rusqlite]
-  version = "0.16.0"
+  version = "0.20.0"
   features = ["bundled"]
   ```
 * You can set the `SQLITE3_LIB_DIR` to point to directory containing the SQLite
@@ -128,8 +132,10 @@ You can adjust this behavior in a number of ways:
 * Installing the sqlite3 development packages will usually be all that is required, but
   the build helpers for [pkg-config](https://github.com/alexcrichton/pkg-config-rs)
   and [vcpkg](https://github.com/mcgoo/vcpkg-rs) have some additional configuration
-  options. The default when using vcpkg is to dynamically link. `vcpkg install sqlite3:x64-windows` will install the required library.
+  options. The default when using vcpkg is to dynamically link,
-
+  which must be enabled by setting `VCPKGRS_DYNAMIC=1` environment variable before build.
+  `vcpkg install sqlite3:x64-windows` will install the required library.
+  
 ### Binding generation
 
 We use [bindgen](https://crates.io/crates/bindgen) to generate the Rust

appveyor.yml

@@ -16,10 +16,10 @@ install:
   - rustc -V
   - cargo -V
   # download SQLite dll (useful only when the `bundled` feature is not set)
-  - appveyor-retry appveyor DownloadFile https://sqlite.org/2018/sqlite-dll-win64-x64-3250000.zip -FileName sqlite-dll-win64-x64.zip
+  - appveyor-retry appveyor DownloadFile https://sqlite.org/2018/sqlite-dll-win64-x64-3250200.zip -FileName sqlite-dll-win64-x64.zip
   - if not defined VCPKG_DEFAULT_TRIPLET 7z e sqlite-dll-win64-x64.zip -y > nul
   # download SQLite headers (useful only when the `bundled` feature is not set)
-  - appveyor-retry appveyor DownloadFile https://sqlite.org/2018/sqlite-amalgamation-3250000.zip -FileName sqlite-amalgamation.zip
+  - appveyor-retry appveyor DownloadFile https://sqlite.org/2018/sqlite-amalgamation-3250200.zip -FileName sqlite-amalgamation.zip
   - if not defined VCPKG_DEFAULT_TRIPLET 7z e sqlite-amalgamation.zip -y > nul
   # specify where the SQLite dll has been downloaded (useful only when the `bundled` feature is not set)
   - if not defined VCPKG_DEFAULT_TRIPLET SET SQLITE3_LIB_DIR=%APPVEYOR_BUILD_FOLDER%
@@ -33,8 +33,8 @@ build: false
 test_script:
   - cargo test --lib --verbose
   - cargo test --lib --verbose --features bundled
-  - cargo test --lib --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab"
+  - cargo test --lib --features "backup blob chrono collation functions hooks limits load_extension serde_json trace"
-  - cargo test --lib --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab buildtime_bindgen"
+  - cargo test --lib --features "backup blob chrono functions hooks limits load_extension serde_json trace buildtime_bindgen"
   - cargo test --lib --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab bundled"
   - cargo test --lib --features "backup blob chrono csvtab functions hooks limits load_extension serde_json trace vtab bundled buildtime_bindgen"
 

libsqlite3-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libsqlite3-sys"
-version = "0.12.0"
+version = "0.16.0"
 authors = ["John Gallagher <jgallagher@bignerdranch.com>"]
 edition = "2018"
 repository = "https://github.com/jgallagher/rusqlite"
@@ -14,6 +14,7 @@ categories = ["external-ffi-bindings"]
 [features]
 default = ["min_sqlite_version_3_6_8"]
 bundled = ["cc"]
+bundled-windows = ["cc"]
 buildtime_bindgen = ["bindgen", "pkg-config", "vcpkg"]
 sqlcipher = []
 min_sqlite_version_3_6_8 = ["pkg-config", "vcpkg"]
@@ -28,7 +29,7 @@ preupdate_hook = []
 session = ["preupdate_hook"]
 
 [build-dependencies]
-bindgen = { version = "0.47", optional = true }
+bindgen = { version = "0.51", optional = true, default-features = false }
 pkg-config = { version = "0.3", optional = true }
 cc = { version = "1.0", optional = true }
 

libsqlite3-sys/build.rs

@@ -4,16 +4,40 @@ use std::path::Path;
 fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
     let out_path = Path::new(&out_dir).join("bindgen.rs");
-    build::main(&out_dir, &out_path);
+    if cfg!(feature = "sqlcipher") {
+        if cfg!(any(
+            feature = "bundled",
+            all(windows, feature = "bundled-windows")
+        )) {
+            println!(
+                "cargo:warning={}",
+                "Builds with bundled SQLCipher are not supported. Searching for SQLCipher to link against. \
+                 This can lead to issues if your version of SQLCipher is not up to date!");
+        }
+        build_linked::main(&out_dir, &out_path)
+    } else {
+        // This can't be `cfg!` without always requiring our `mod build_bundled` (and
+        // thus `cc`)
+        #[cfg(any(feature = "bundled", all(windows, feature = "bundled-windows")))]
+        {
+            build_bundled::main(&out_dir, &out_path)
+        }
+        #[cfg(not(any(feature = "bundled", all(windows, feature = "bundled-windows"))))]
+        {
+            build_linked::main(&out_dir, &out_path)
+        }
+    }
 }
 
-#[cfg(feature = "bundled")]
+#[cfg(any(feature = "bundled", all(windows, feature = "bundled-windows")))]
-mod build {
+mod build_bundled {
     use cc;
+    use std::env;
     use std::path::Path;
 
     pub fn main(out_dir: &str, out_path: &Path) {
         if cfg!(feature = "sqlcipher") {
+            // This is just a sanity check, the top level `main` should ensure this.
             panic!("Builds with bundled SQLCipher are not supported");
         }
 
@@ -46,11 +70,29 @@ mod build {
             .flag("-DSQLITE_ENABLE_RTREE")
             .flag("-DSQLITE_ENABLE_STAT2")
             .flag("-DSQLITE_ENABLE_STAT4")
-            .flag("-DSQLITE_HAVE_ISNAN")
             .flag("-DSQLITE_SOUNDEX")
             .flag("-DSQLITE_THREADSAFE=1")
             .flag("-DSQLITE_USE_URI")
             .flag("-DHAVE_USLEEP=1");
+        // Older versions of visual studio don't support c99 (including isnan), which
+        // causes a build failure when the linker fails to find the `isnan`
+        // function. `sqlite` provides its own implmentation, using the fact
+        // that x != x when x is NaN.
+        //
+        // There may be other platforms that don't support `isnan`, they should be
+        // tested for here.
+        if cfg!(target_env = "msvc") {
+            use cc::windows_registry::{find_vs_version, VsVers};
+            let vs_has_nan = match find_vs_version() {
+                Ok(ver) => ver != VsVers::Vs12,
+                Err(_msg) => false,
+            };
+            if vs_has_nan {
+                cfg.flag("-DSQLITE_HAVE_ISNAN");
+            }
+        } else {
+            cfg.flag("-DSQLITE_HAVE_ISNAN");
+        }
         if cfg!(feature = "unlock_notify") {
             cfg.flag("-DSQLITE_ENABLE_UNLOCK_NOTIFY");
         }
@@ -60,6 +102,17 @@ mod build {
         if cfg!(feature = "session") {
             cfg.flag("-DSQLITE_ENABLE_SESSION");
         }
+
+        if let Ok(limit) = env::var("SQLITE_MAX_VARIABLE_NUMBER") {
+            cfg.flag(&format!("-DSQLITE_MAX_VARIABLE_NUMBER={}", limit));
+        }
+        println!("cargo:rerun-if-env-changed=SQLITE_MAX_VARIABLE_NUMBER");
+
+        if let Ok(limit) = env::var("SQLITE_MAX_EXPR_DEPTH") {
+            cfg.flag(&format!("-DSQLITE_MAX_EXPR_DEPTH={}", limit));
+        }
+        println!("cargo:rerun-if-env-changed=SQLITE_MAX_EXPR_DEPTH");
+
         cfg.compile("libsqlite3.a");
 
         println!("cargo:lib_dir={}", out_dir);
@@ -98,8 +151,7 @@ impl From<HeaderLocation> for String {
     }
 }
 
-#[cfg(not(feature = "bundled"))]
+mod build_linked {
-mod build {
     use pkg_config;
 
     #[cfg(all(feature = "vcpkg", target_env = "msvc"))]
@@ -111,7 +163,24 @@ mod build {
 
     pub fn main(_out_dir: &str, out_path: &Path) {
         let header = find_sqlite();
-        bindings::write_to_out_dir(header, out_path);
+        if cfg!(any(
+            feature = "bundled",
+            all(windows, feature = "bundled-windows")
+        )) && !cfg!(feature = "buildtime_bindgen")
+        {
+            // We can only get here if `bundled` and `sqlcipher` were both
+            // specified (and `builtime_bindgen` was not). In order to keep
+            // `rusqlite` relatively clean we hide the fact that `bundled` can
+            // be ignored in some cases, and just use the bundled bindings, even
+            // though the library we found might not match their version.
+            // Ideally we'd perform a version check here, but doing so is rather
+            // tricky, since we might not have access to executables (and
+            // moreover, we might be cross compiling).
+            std::fs::copy("sqlite3/bindgen_bundled_version.rs", out_path)
+                .expect("Could not copy bindings to output directory");
+        } else {
+            bindings::write_to_out_dir(header, out_path);
+        }
     }
 
     fn find_link_mode() -> &'static str {
@@ -132,10 +201,19 @@ mod build {
         if cfg!(target_os = "windows") {
             println!("cargo:rerun-if-env-changed=PATH");
         }
+        if cfg!(all(feature = "vcpkg", target_env = "msvc")) {
+            println!("cargo:rerun-if-env-changed=VCPKGRS_DYNAMIC");
+        }
         // Allow users to specify where to find SQLite.
         if let Ok(dir) = env::var(format!("{}_LIB_DIR", env_prefix())) {
-            println!("cargo:rustc-link-lib={}={}", find_link_mode(), link_lib);
+            // Try to use pkg-config to determine link commands
-            println!("cargo:rustc-link-search={}", dir);
+            let pkgconfig_path = Path::new(&dir).join("pkgconfig");
+            env::set_var("PKG_CONFIG_PATH", pkgconfig_path);
+            if let Err(_) = pkg_config::Config::new().probe(link_lib) {
+                // Otherwise just emit the bare minimum link commands.
+                println!("cargo:rustc-link-lib={}={}", find_link_mode(), link_lib);
+                println!("cargo:rustc-link-search={}", dir);
+            }
             return HeaderLocation::FromEnvironment;
         }
 
@@ -193,7 +271,7 @@ mod build {
     }
 }
 
-#[cfg(all(not(feature = "buildtime_bindgen"), not(feature = "bundled")))]
+#[cfg(not(feature = "buildtime_bindgen"))]
 mod bindings {
     use super::HeaderLocation;
 
@@ -220,8 +298,8 @@ mod bindings {
 mod bindings {
     use bindgen;
 
-    use self::bindgen::callbacks::{IntKind, ParseCallbacks};
     use super::HeaderLocation;
+    use bindgen::callbacks::{IntKind, ParseCallbacks};
 
     use std::fs::OpenOptions;
     use std::io::Write;

libsqlite3-sys/sqlite3/bindgen_bundled_version.rs

@@ -1,10 +1,10 @@
 /* automatically generated by rust-bindgen */
 
 pub const __GNUC_VA_LIST: i32 = 1;
-pub const SQLITE_VERSION: &'static [u8; 7usize] = b"3.26.0\0";
+pub const SQLITE_VERSION: &'static [u8; 7usize] = b"3.29.0\0";
-pub const SQLITE_VERSION_NUMBER: i32 = 3026000;
+pub const SQLITE_VERSION_NUMBER: i32 = 3029000;
 pub const SQLITE_SOURCE_ID: &'static [u8; 85usize] =
-    b"2018-12-01 12:34:55 bf8c1b2b7a5960c282e543b9c293686dccff272512d08865f4600fb58238b4f9\0";
+    b"2019-07-10 17:32:03 fc82b73eaac8b36950e527f12c4b5dc1e147e6f4ad2217ae43ad82882a88bfa6\0";
 pub const SQLITE_OK: i32 = 0;
 pub const SQLITE_ERROR: i32 = 1;
 pub const SQLITE_INTERNAL: i32 = 2;
@@ -180,6 +180,7 @@ pub const SQLITE_FCNTL_COMMIT_ATOMIC_WRITE: i32 = 32;
 pub const SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE: i32 = 33;
 pub const SQLITE_FCNTL_LOCK_TIMEOUT: i32 = 34;
 pub const SQLITE_FCNTL_DATA_VERSION: i32 = 35;
+pub const SQLITE_FCNTL_SIZE_LIMIT: i32 = 36;
 pub const SQLITE_GET_LOCKPROXYFILE: i32 = 2;
 pub const SQLITE_SET_LOCKPROXYFILE: i32 = 3;
 pub const SQLITE_LAST_ERRNO: i32 = 4;
@@ -218,6 +219,7 @@ pub const SQLITE_CONFIG_PMASZ: i32 = 25;
 pub const SQLITE_CONFIG_STMTJRNL_SPILL: i32 = 26;
 pub const SQLITE_CONFIG_SMALL_MALLOC: i32 = 27;
 pub const SQLITE_CONFIG_SORTERREF_SIZE: i32 = 28;
+pub const SQLITE_CONFIG_MEMDB_MAXSIZE: i32 = 29;
 pub const SQLITE_DBCONFIG_MAINDBNAME: i32 = 1000;
 pub const SQLITE_DBCONFIG_LOOKASIDE: i32 = 1001;
 pub const SQLITE_DBCONFIG_ENABLE_FKEY: i32 = 1002;
@@ -229,7 +231,11 @@ pub const SQLITE_DBCONFIG_ENABLE_QPSG: i32 = 1007;
 pub const SQLITE_DBCONFIG_TRIGGER_EQP: i32 = 1008;
 pub const SQLITE_DBCONFIG_RESET_DATABASE: i32 = 1009;
 pub const SQLITE_DBCONFIG_DEFENSIVE: i32 = 1010;
-pub const SQLITE_DBCONFIG_MAX: i32 = 1010;
+pub const SQLITE_DBCONFIG_WRITABLE_SCHEMA: i32 = 1011;
+pub const SQLITE_DBCONFIG_LEGACY_ALTER_TABLE: i32 = 1012;
+pub const SQLITE_DBCONFIG_DQS_DML: i32 = 1013;
+pub const SQLITE_DBCONFIG_DQS_DDL: i32 = 1014;
+pub const SQLITE_DBCONFIG_MAX: i32 = 1014;
 pub const SQLITE_DENY: i32 = 1;
 pub const SQLITE_IGNORE: i32 = 2;
 pub const SQLITE_CREATE_INDEX: i32 = 1;
@@ -284,6 +290,7 @@ pub const SQLITE_LIMIT_TRIGGER_DEPTH: i32 = 10;
 pub const SQLITE_LIMIT_WORKER_THREADS: i32 = 11;
 pub const SQLITE_PREPARE_PERSISTENT: i32 = 1;
 pub const SQLITE_PREPARE_NORMALIZE: i32 = 2;
+pub const SQLITE_PREPARE_NO_VTAB: i32 = 4;
 pub const SQLITE_INTEGER: i32 = 1;
 pub const SQLITE_FLOAT: i32 = 2;
 pub const SQLITE_BLOB: i32 = 4;
@@ -356,7 +363,8 @@ pub const SQLITE_TESTCTRL_ISINIT: i32 = 23;
 pub const SQLITE_TESTCTRL_SORTER_MMAP: i32 = 24;
 pub const SQLITE_TESTCTRL_IMPOSTER: i32 = 25;
 pub const SQLITE_TESTCTRL_PARSER_COVERAGE: i32 = 26;
-pub const SQLITE_TESTCTRL_LAST: i32 = 26;
+pub const SQLITE_TESTCTRL_RESULT_INTREAL: i32 = 27;
+pub const SQLITE_TESTCTRL_LAST: i32 = 27;
 pub const SQLITE_STATUS_MEMORY_USED: i32 = 0;
 pub const SQLITE_STATUS_PAGECACHE_USED: i32 = 1;
 pub const SQLITE_STATUS_PAGECACHE_OVERFLOW: i32 = 2;
@@ -417,7 +425,6 @@ pub const FTS5_TOKEN_COLOCATED: i32 = 1;
 pub type va_list = __builtin_va_list;
 pub type __gnuc_va_list = __builtin_va_list;
 extern "C" {
-    #[link_name = "\u{1}sqlite3_version"]
     pub static mut sqlite3_version: [::std::os::raw::c_char; 0usize];
 }
 extern "C" {
@@ -1645,6 +1652,9 @@ extern "C" {
 extern "C" {
     pub fn sqlite3_stmt_readonly(pStmt: *mut sqlite3_stmt) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn sqlite3_stmt_isexplain(pStmt: *mut sqlite3_stmt) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn sqlite3_stmt_busy(arg1: *mut sqlite3_stmt) -> ::std::os::raw::c_int;
 }
@@ -2086,6 +2096,9 @@ extern "C" {
 extern "C" {
     pub fn sqlite3_value_nochange(arg1: *mut sqlite3_value) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn sqlite3_value_frombind(arg1: *mut sqlite3_value) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn sqlite3_value_subtype(arg1: *mut sqlite3_value) -> ::std::os::raw::c_uint;
 }
@@ -2322,11 +2335,9 @@ extern "C" {
     pub fn sqlite3_sleep(arg1: ::std::os::raw::c_int) -> ::std::os::raw::c_int;
 }
 extern "C" {
-    #[link_name = "\u{1}sqlite3_temp_directory"]
     pub static mut sqlite3_temp_directory: *mut ::std::os::raw::c_char;
 }
 extern "C" {
-    #[link_name = "\u{1}sqlite3_data_directory"]
     pub static mut sqlite3_data_directory: *mut ::std::os::raw::c_char;
 }
 extern "C" {

libsqlite3-sys/sqlite3/sqlite3.h

@@ -123,9 +123,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.26.0"
+#define SQLITE_VERSION        "3.29.0"
-#define SQLITE_VERSION_NUMBER 3026000
+#define SQLITE_VERSION_NUMBER 3029000
-#define SQLITE_SOURCE_ID      "2018-12-01 12:34:55 bf8c1b2b7a5960c282e543b9c293686dccff272512d08865f4600fb58238b4f9"
+#define SQLITE_SOURCE_ID      "2019-07-10 17:32:03 fc82b73eaac8b36950e527f12c4b5dc1e147e6f4ad2217ae43ad82882a88bfa6"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -189,6 +189,9 @@ SQLITE_API int sqlite3_libversion_number(void);
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
 SQLITE_API int sqlite3_compileoption_used(const char *zOptName);
 SQLITE_API const char *sqlite3_compileoption_get(int N);
+#else
+# define sqlite3_compileoption_used(X) 0
+# define sqlite3_compileoption_get(X)  ((void*)0)
 #endif
 
 /*
@@ -823,6 +826,15 @@ struct sqlite3_io_methods {
 ** file space based on this hint in order to help writes to the database
 ** file run faster.
 **
+** <li>[[SQLITE_FCNTL_SIZE_LIMIT]]
+** The [SQLITE_FCNTL_SIZE_LIMIT] opcode is used by in-memory VFS that
+** implements [sqlite3_deserialize()] to set an upper bound on the size
+** of the in-memory database.  The argument is a pointer to a [sqlite3_int64].
+** If the integer pointed to is negative, then it is filled in with the
+** current limit.  Otherwise the limit is set to the larger of the value
+** of the integer pointed to and the current database size.  The integer
+** pointed to is set to the new limit.
+**
 ** <li>[[SQLITE_FCNTL_CHUNK_SIZE]]
 ** The [SQLITE_FCNTL_CHUNK_SIZE] opcode is used to request that the VFS
 ** extends and truncates the database file in chunks of a size specified
@@ -1131,6 +1143,7 @@ struct sqlite3_io_methods {
 #define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
 #define SQLITE_FCNTL_LOCK_TIMEOUT           34
 #define SQLITE_FCNTL_DATA_VERSION           35
+#define SQLITE_FCNTL_SIZE_LIMIT             36
 
 /* deprecated names */
 #define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
@@ -1283,8 +1296,14 @@ typedef struct sqlite3_api_routines sqlite3_api_routines;
 ** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
 ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
 ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
-** to test whether a file is at least readable.   The file can be a
+** to test whether a file is at least readable.  The SQLITE_ACCESS_READ
-** directory.
+** flag is never actually used and is not implemented in the built-in
+** VFSes of SQLite.  The file is named by the second argument and can be a
+** directory. The xAccess method returns [SQLITE_OK] on success or some
+** non-zero error code if there is an I/O error or if the name of
+** the file given in the second argument is illegal.  If SQLITE_OK
+** is returned, then non-zero or zero is written into *pResOut to indicate
+** whether or not the file is accessible.  
 **
 ** ^SQLite will always allocate at least mxPathname+1 bytes for the
 ** output buffer xFullPathname.  The exact size of the output buffer
@@ -1972,6 +1991,17 @@ struct sqlite3_mem_methods {
 ** negative value for this option restores the default behaviour.
 ** This option is only available if SQLite is compiled with the
 ** [SQLITE_ENABLE_SORTER_REFERENCES] compile-time option.
+**
+** [[SQLITE_CONFIG_MEMDB_MAXSIZE]]
+** <dt>SQLITE_CONFIG_MEMDB_MAXSIZE
+** <dd>The SQLITE_CONFIG_MEMDB_MAXSIZE option accepts a single parameter
+** [sqlite3_int64] parameter which is the default maximum size for an in-memory
+** database created using [sqlite3_deserialize()].  This default maximum
+** size can be adjusted up or down for individual databases using the
+** [SQLITE_FCNTL_SIZE_LIMIT] [sqlite3_file_control|file-control].  If this
+** configuration setting is never used, then the default maximum is determined
+** by the [SQLITE_MEMDB_DEFAULT_MAXSIZE] compile-time option.  If that
+** compile-time option is not set, then the default maximum is 1073741824.
 ** </dl>
 */
 #define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
@@ -2002,6 +2032,7 @@ struct sqlite3_mem_methods {
 #define SQLITE_CONFIG_STMTJRNL_SPILL      26  /* int nByte */
 #define SQLITE_CONFIG_SMALL_MALLOC        27  /* boolean */
 #define SQLITE_CONFIG_SORTERREF_SIZE      28  /* int nByte */
+#define SQLITE_CONFIG_MEMDB_MAXSIZE       29  /* sqlite3_int64 */
 
 /*
 ** CAPI3REF: Database Connection Configuration Options
@@ -2064,8 +2095,8 @@ struct sqlite3_mem_methods {
 **
 ** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
 ** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
-** <dd> ^This option is used to enable or disable the two-argument
+** <dd> ^This option is used to enable or disable the
-** version of the [fts3_tokenizer()] function which is part of the
+** [fts3_tokenizer()] function which is part of the
 ** [FTS3] full-text search engine extension.
 ** There should be two additional arguments.
 ** The first argument is an integer which is 0 to disable fts3_tokenizer() or
@@ -2173,10 +2204,50 @@ struct sqlite3_mem_methods {
 ** features include but are not limited to the following:
 ** <ul>
 ** <li> The [PRAGMA writable_schema=ON] statement.
+** <li> The [PRAGMA journal_mode=OFF] statement.
 ** <li> Writes to the [sqlite_dbpage] virtual table.
 ** <li> Direct writes to [shadow tables].
 ** </ul>
 ** </dd>
+**
+** [[SQLITE_DBCONFIG_WRITABLE_SCHEMA]] <dt>SQLITE_DBCONFIG_WRITABLE_SCHEMA</dt>
+** <dd>The SQLITE_DBCONFIG_WRITABLE_SCHEMA option activates or deactivates the
+** "writable_schema" flag. This has the same effect and is logically equivalent
+** to setting [PRAGMA writable_schema=ON] or [PRAGMA writable_schema=OFF].
+** The first argument to this setting is an integer which is 0 to disable 
+** the writable_schema, positive to enable writable_schema, or negative to
+** leave the setting unchanged. The second parameter is a pointer to an
+** integer into which is written 0 or 1 to indicate whether the writable_schema
+** is enabled or disabled following this call.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_LEGACY_ALTER_TABLE]]
+** <dt>SQLITE_DBCONFIG_LEGACY_ALTER_TABLE</dt>
+** <dd>The SQLITE_DBCONFIG_LEGACY_ALTER_TABLE option activates or deactivates
+** the legacy behavior of the [ALTER TABLE RENAME] command such it
+** behaves as it did prior to [version 3.24.0] (2018-06-04).  See the
+** "Compatibility Notice" on the [ALTER TABLE RENAME documentation] for
+** additional information. This feature can also be turned on and off
+** using the [PRAGMA legacy_alter_table] statement.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DML]]
+** <dt>SQLITE_DBCONFIG_DQS_DML</td>
+** <dd>The SQLITE_DBCONFIG_DQS_DML option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DML statement
+** only, that is DELETE, INSERT, SELECT, and UPDATE statements. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DDL]]
+** <dt>SQLITE_DBCONFIG_DQS_DDL</td>
+** <dd>The SQLITE_DBCONFIG_DQS option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DDL statements,
+** such as CREATE TABLE and CREATE INDEX. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
 ** </dl>
 */
 #define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
@@ -2190,7 +2261,11 @@ struct sqlite3_mem_methods {
 #define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */
 #define SQLITE_DBCONFIG_RESET_DATABASE        1009 /* int int* */
 #define SQLITE_DBCONFIG_DEFENSIVE             1010 /* int int* */
-#define SQLITE_DBCONFIG_MAX                   1010 /* Largest DBCONFIG */
+#define SQLITE_DBCONFIG_WRITABLE_SCHEMA       1011 /* int int* */
+#define SQLITE_DBCONFIG_LEGACY_ALTER_TABLE    1012 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DML               1013 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DDL               1014 /* int int* */
+#define SQLITE_DBCONFIG_MAX                   1014 /* Largest DBCONFIG */
 
 /*
 ** CAPI3REF: Enable Or Disable Extended Result Codes
@@ -2347,7 +2422,7 @@ SQLITE_API int sqlite3_changes(sqlite3*);
 ** not. ^Changes to a view that are intercepted by INSTEAD OF triggers 
 ** are not counted.
 **
-** This the [sqlite3_total_changes(D)] interface only reports the number
+** The [sqlite3_total_changes(D)] interface only reports the number
 ** of rows that changed due to SQL statement run against database
 ** connection D.  Any changes by other database connections are ignored.
 ** To detect changes against a database file from other database
@@ -2991,9 +3066,9 @@ SQLITE_API int sqlite3_set_authorizer(
 ** time is in units of nanoseconds, however the current implementation
 ** is only capable of millisecond resolution so the six least significant
 ** digits in the time are meaningless.  Future versions of SQLite
-** might provide greater resolution on the profiler callback.  The
+** might provide greater resolution on the profiler callback.  Invoking
-** sqlite3_profile() function is considered experimental and is
+** either [sqlite3_trace()] or [sqlite3_trace_v2()] will cancel the
-** subject to change in future versions of SQLite.
+** profile callback.
 */
 SQLITE_API SQLITE_DEPRECATED void *sqlite3_trace(sqlite3*,
    void(*xTrace)(void*,const char*), void*);
@@ -3407,6 +3482,8 @@ SQLITE_API int sqlite3_open_v2(
 ** is not a database file pathname pointer that SQLite passed into the xOpen
 ** VFS method, then the behavior of this routine is undefined and probably
 ** undesirable.
+**
+** See the [URI filename] documentation for additional information.
 */
 SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
 SQLITE_API int sqlite3_uri_boolean(const char *zFile, const char *zParam, int bDefault);
@@ -3629,18 +3706,23 @@ SQLITE_API int sqlite3_limit(sqlite3*, int id, int newVal);
 ** deplete the limited store of lookaside memory. Future versions of
 ** SQLite may act on this hint differently.
 **
-** [[SQLITE_PREPARE_NORMALIZE]] ^(<dt>SQLITE_PREPARE_NORMALIZE</dt>
+** [[SQLITE_PREPARE_NORMALIZE]] <dt>SQLITE_PREPARE_NORMALIZE</dt>
-** <dd>The SQLITE_PREPARE_NORMALIZE flag indicates that a normalized
+** <dd>The SQLITE_PREPARE_NORMALIZE flag is a no-op. This flag used
-** representation of the SQL statement should be calculated and then
+** to be required for any prepared statement that wanted to use the
-** associated with the prepared statement, which can be obtained via
+** [sqlite3_normalized_sql()] interface.  However, the
-** the [sqlite3_normalized_sql()] interface.)^  The semantics used to
+** [sqlite3_normalized_sql()] interface is now available to all
-** normalize a SQL statement are unspecified and subject to change.
+** prepared statements, regardless of whether or not they use this
-** At a minimum, literal values will be replaced with suitable
+** flag.
-** placeholders.
+**
+** [[SQLITE_PREPARE_NO_VTAB]] <dt>SQLITE_PREPARE_NO_VTAB</dt>
+** <dd>The SQLITE_PREPARE_NO_VTAB flag causes the SQL compiler
+** to return an error (error code SQLITE_ERROR) if the statement uses
+** any virtual tables.
 ** </dl>
 */
 #define SQLITE_PREPARE_PERSISTENT              0x01
 #define SQLITE_PREPARE_NORMALIZE               0x02
+#define SQLITE_PREPARE_NO_VTAB                 0x04
 
 /*
 ** CAPI3REF: Compiling An SQL Statement
@@ -3865,6 +3947,18 @@ SQLITE_API const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt);
 */
 SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);
 
+/*
+** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_isexplain(S) interface returns 1 if the
+** prepared statement S is an EXPLAIN statement, or 2 if the
+** statement S is an EXPLAIN QUERY PLAN.
+** ^The sqlite3_stmt_isexplain(S) interface returns 0 if S is
+** an ordinary statement or a NULL pointer.
+*/
+SQLITE_API int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
+
 /*
 ** CAPI3REF: Determine If A Prepared Statement Has Been Reset
 ** METHOD: sqlite3_stmt
@@ -4004,7 +4098,9 @@ typedef struct sqlite3_context sqlite3_context;
 ** ^The fifth argument to the BLOB and string binding interfaces
 ** is a destructor used to dispose of the BLOB or
 ** string after SQLite has finished with it.  ^The destructor is called
-** to dispose of the BLOB or string even if the call to bind API fails.
+** to dispose of the BLOB or string even if the call to the bind API fails,
+** except the destructor is not called if the third parameter is a NULL
+** pointer or the fourth parameter is negative.
 ** ^If the fifth argument is
 ** the special value [SQLITE_STATIC], then SQLite assumes that the
 ** information is in static, unmanaged space and does not need to be freed.
@@ -4921,6 +5017,8 @@ SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int6
 ** <tr><td><b>sqlite3_value_nochange&nbsp;&nbsp;</b>
 ** <td>&rarr;&nbsp;&nbsp;<td>True if the column is unchanged in an UPDATE
 ** against a virtual table.
+** <tr><td><b>sqlite3_value_frombind&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>True if value originated from a [bound parameter]
 ** </table></blockquote>
 **
 ** <b>Details:</b>
@@ -4982,6 +5080,11 @@ SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int6
 ** than within an [xUpdate] method call for an UPDATE statement, then
 ** the return value is arbitrary and meaningless.
 **
+** ^The sqlite3_value_frombind(X) interface returns non-zero if the
+** value X originated from one of the [sqlite3_bind_int|sqlite3_bind()]
+** interfaces.  ^If X comes from an SQL literal value, or a table column,
+** and expression, then sqlite3_value_frombind(X) returns zero.
+**
 ** Please pay particular attention to the fact that the pointer returned
 ** from [sqlite3_value_blob()], [sqlite3_value_text()], or
 ** [sqlite3_value_text16()] can be invalidated by a subsequent call to
@@ -5027,6 +5130,7 @@ SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
 SQLITE_API int sqlite3_value_type(sqlite3_value*);
 SQLITE_API int sqlite3_value_numeric_type(sqlite3_value*);
 SQLITE_API int sqlite3_value_nochange(sqlite3_value*);
+SQLITE_API int sqlite3_value_frombind(sqlite3_value*);
 
 /*
 ** CAPI3REF: Finding The Subtype Of SQL Values
@@ -5762,7 +5866,7 @@ SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
 ** associated with database N of connection D.  ^The main database file
 ** has the name "main".  If there is no attached database N on the database
 ** connection D, or if database N is a temporary or in-memory database, then
-** a NULL pointer is returned.
+** this function will return either a NULL pointer or an empty string.
 **
 ** ^The filename returned by this function is the output of the
 ** xFullPathname method of the [VFS].  ^In other words, the filename
@@ -7253,7 +7357,8 @@ SQLITE_API int sqlite3_test_control(int op, ...);
 #define SQLITE_TESTCTRL_SORTER_MMAP             24
 #define SQLITE_TESTCTRL_IMPOSTER                25
 #define SQLITE_TESTCTRL_PARSER_COVERAGE         26
-#define SQLITE_TESTCTRL_LAST                    26  /* Largest TESTCTRL */
+#define SQLITE_TESTCTRL_RESULT_INTREAL          27
+#define SQLITE_TESTCTRL_LAST                    27  /* Largest TESTCTRL */
 
 /*
 ** CAPI3REF: SQL Keyword Checking
@@ -9996,7 +10101,7 @@ SQLITE_API int sqlite3changeset_next(sqlite3_changeset_iter *pIter);
 ** sqlite3changeset_next() is called on the iterator or until the 
 ** conflict-handler function returns. If pnCol is not NULL, then *pnCol is 
 ** set to the number of columns in the table affected by the change. If
-** pbIncorrect is not NULL, then *pbIndirect is set to true (1) if the change
+** pbIndirect is not NULL, then *pbIndirect is set to true (1) if the change
 ** is an indirect change, or false (0) otherwise. See the documentation for
 ** [sqlite3session_indirect()] for a description of direct and indirect
 ** changes. Finally, if pOp is not NULL, then *pOp is set to one of 
@@ -10863,7 +10968,7 @@ SQLITE_API int sqlite3rebaser_configure(
 ** in size. This function allocates and populates a buffer with a copy
 ** of the changeset rebased rebased according to the configuration of the
 ** rebaser object passed as the first argument. If successful, (*ppOut)
-** is set to point to the new buffer containing the rebased changset and 
+** is set to point to the new buffer containing the rebased changeset and 
 ** (*pnOut) to its size in bytes and SQLITE_OK returned. It is the
 ** responsibility of the caller to eventually free the new buffer using
 ** sqlite3_free(). Otherwise, if an error occurs, (*ppOut) and (*pnOut)
@@ -11230,12 +11335,8 @@ struct Fts5PhraseIter {
 **
 **   Usually, output parameter *piPhrase is set to the phrase number, *piCol
 **   to the column in which it occurs and *piOff the token offset of the
-**   first token of the phrase. The exception is if the table was created
+**   first token of the phrase. Returns SQLITE_OK if successful, or an error
-**   with the offsets=0 option specified. In this case *piOff is always
+**   code (i.e. SQLITE_NOMEM) if an error occurs.
-**   set to -1.
-**
-**   Returns SQLITE_OK if successful, or an error code (i.e. SQLITE_NOMEM) 
-**   if an error occurs.
 **
 **   This API can be quite slow if used with an FTS5 table created with the
 **   "detail=none" or "detail=column" option. 
@@ -11276,7 +11377,7 @@ struct Fts5PhraseIter {
 **   Save the pointer passed as the second argument as the extension functions 
 **   "auxiliary data". The pointer may then be retrieved by the current or any
 **   future invocation of the same fts5 extension function made as part of
-**   of the same MATCH query using the xGetAuxdata() API.
+**   the same MATCH query using the xGetAuxdata() API.
 **
 **   Each extension function is allocated a single auxiliary data slot for
 **   each FTS query (MATCH expression). If the extension function is invoked 
@@ -11291,7 +11392,7 @@ struct Fts5PhraseIter {
 **   The xDelete callback, if one is specified, is also invoked on the
 **   auxiliary data pointer after the FTS5 query has finished.
 **
-**   If an error (e.g. an OOM condition) occurs within this function, an
+**   If an error (e.g. an OOM condition) occurs within this function,
 **   the auxiliary data is set to NULL and an error code returned. If the
 **   xDelete parameter was not NULL, it is invoked on the auxiliary data
 **   pointer before returning.
@@ -11524,11 +11625,11 @@ struct Fts5ExtensionApi {
 **            the tokenizer substitutes "first" for "1st" and the query works
 **            as expected.
 **
-**       <li> By adding multiple synonyms for a single term to the FTS index.
+**       <li> By querying the index for all synonyms of each query term
-**            In this case, when tokenizing query text, the tokenizer may 
+**            separately. In this case, when tokenizing query text, the
-**            provide multiple synonyms for a single term within the document.
+**            tokenizer may provide multiple synonyms for a single term 
-**            FTS5 then queries the index for each synonym individually. For
+**            within the document. FTS5 then queries the index for each 
-**            example, faced with the query:
+**            synonym individually. For example, faced with the query:
 **
 **   <codeblock>
 **     ... MATCH 'first place'</codeblock>
@@ -11552,7 +11653,7 @@ struct Fts5ExtensionApi {
 **            "place".
 **
 **            This way, even if the tokenizer does not provide synonyms
-**            when tokenizing query text (it should not - to do would be
+**            when tokenizing query text (it should not - to do so would be
 **            inefficient), it doesn't matter if the user queries for 
 **            'first + place' or '1st + place', as there are entries in the
 **            FTS index corresponding to both forms of the first token.

libsqlite3-sys/sqlite3/sqlite3ext.h

@@ -319,6 +319,9 @@ struct sqlite3_api_routines {
                             void(*xDestroy)(void*));
   /* Version 3.26.0 and later */
   const char *(*normalized_sql)(sqlite3_stmt*);
+  /* Version 3.28.0 and later */
+  int (*stmt_isexplain)(sqlite3_stmt*);
+  int (*value_frombind)(sqlite3_value*);
 };
 
 /*
@@ -608,6 +611,9 @@ typedef int (*sqlite3_loadext_entry)(
 #define sqlite3_create_window_function sqlite3_api->create_window_function
 /* Version 3.26.0 and later */
 #define sqlite3_normalized_sql         sqlite3_api->normalized_sql
+/* Version 3.28.0 and later */
+#define sqlite3_stmt_isexplain         sqlite3_api->isexplain
+#define sqlite3_value_frombind         sqlite3_api->frombind
 #endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */
 
 #if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)

libsqlite3-sys/upgrade.sh

@@ -4,8 +4,8 @@ cd $SCRIPT_DIR
 export SQLITE3_LIB_DIR=$SCRIPT_DIR/sqlite3
 
 # Download and extract amalgamation
-SQLITE=sqlite-amalgamation-3260000
+SQLITE=sqlite-amalgamation-3290000
-curl -O http://sqlite.org/2018/$SQLITE.zip
+curl -O http://sqlite.org/2019/$SQLITE.zip
 unzip -p $SQLITE.zip $SQLITE/sqlite3.c > $SQLITE3_LIB_DIR/sqlite3.c
 unzip -p $SQLITE.zip $SQLITE/sqlite3.h > $SQLITE3_LIB_DIR/sqlite3.h
 unzip -p $SQLITE.zip $SQLITE/sqlite3ext.h > $SQLITE3_LIB_DIR/sqlite3ext.h
@@ -16,9 +16,9 @@ rm -f $SQLITE3_LIB_DIR/bindgen_bundled_version.rs
 export SQLITE3_INCLUDE_DIR=$SQLITE3_LIB_DIR
 cargo update
 # Just to make sure there is only one bindgen.rs file in target dir
-find $SCRIPT_DIR/target -type f -name bindgen.rs -exec rm {} \;
+find $SCRIPT_DIR/../target -type f -name bindgen.rs -exec rm {} \;
 cargo build --features "buildtime_bindgen" --no-default-features
-find $SCRIPT_DIR/target -type f -name bindgen.rs -exec cp {} $SQLITE3_LIB_DIR/bindgen_bundled_version.rs \;
+find $SCRIPT_DIR/../target -type f -name bindgen.rs -exec cp {} $SQLITE3_LIB_DIR/bindgen_bundled_version.rs \;
 # Sanity check
 cd $SCRIPT_DIR/..
 cargo update

src/backup.rs

@@ -167,7 +167,7 @@ pub struct Backup<'a, 'b> {
     b: *mut ffi::sqlite3_backup,
 }
 
-impl<'a, 'b> Backup<'a, 'b> {
+impl Backup<'_, '_> {
     /// Attempt to create a new handle that will allow backups from `from` to
     /// `to`. Note that `to` is a `&mut` - this is because SQLite forbids any
     /// API calls on the destination of a backup while the backup is taking
@@ -177,7 +177,7 @@ impl<'a, 'b> Backup<'a, 'b> {
     ///
     /// Will return `Err` if the underlying `sqlite3_backup_init` call returns
     /// `NULL`.
-    pub fn new(from: &'a Connection, to: &'b mut Connection) -> Result<Backup<'a, 'b>> {
+    pub fn new<'a, 'b>(from: &'a Connection, to: &'b mut Connection) -> Result<Backup<'a, 'b>> {
         Backup::new_with_names(from, DatabaseName::Main, to, DatabaseName::Main)
     }
 
@@ -190,7 +190,7 @@ impl<'a, 'b> Backup<'a, 'b> {
     ///
     /// Will return `Err` if the underlying `sqlite3_backup_init` call returns
     /// `NULL`.
-    pub fn new_with_names(
+    pub fn new_with_names<'a, 'b>(
         from: &'a Connection,
         from_name: DatabaseName<'_>,
         to: &'b mut Connection,
@@ -294,7 +294,7 @@ impl<'a, 'b> Backup<'a, 'b> {
     }
 }
 
-impl<'a, 'b> Drop for Backup<'a, 'b> {
+impl Drop for Backup<'_, '_> {
     fn drop(&mut self) {
         unsafe { ffi::sqlite3_backup_finish(self.b) };
     }

src/blob.rs

@@ -16,43 +16,40 @@
 //! ```rust
 //! use rusqlite::blob::ZeroBlob;
 //! use rusqlite::{Connection, DatabaseName, NO_PARAMS};
+//! use std::error::Error;
 //! use std::io::{Read, Seek, SeekFrom, Write};
 //!
-//! fn main() {
+//! fn main() -> Result<(), Box<Error>> {
-//!     let db = Connection::open_in_memory().unwrap();
+//!     let db = Connection::open_in_memory()?;
-//!     db.execute_batch("CREATE TABLE test (content BLOB);")
+//!     db.execute_batch("CREATE TABLE test (content BLOB);")?;
-//!         .unwrap();
 //!     db.execute(
 //!         "INSERT INTO test (content) VALUES (ZEROBLOB(10))",
 //!         NO_PARAMS,
-//!     )
+//!     )?;
-//!     .unwrap();
 //!
 //!     let rowid = db.last_insert_rowid();
-//!     let mut blob = db
+//!     let mut blob = db.blob_open(DatabaseName::Main, "test", "content", rowid, false)?;
-//!         .blob_open(DatabaseName::Main, "test", "content", rowid, false)
-//!         .unwrap();
 //!
 //!     // Make sure to test that the number of bytes written matches what you expect;
 //!     // if you try to write too much, the data will be truncated to the size of the
 //!     // BLOB.
-//!     let bytes_written = blob.write(b"01234567").unwrap();
+//!     let bytes_written = blob.write(b"01234567")?;
 //!     assert_eq!(bytes_written, 8);
 //!
 //!     // Same guidance - make sure you check the number of bytes read!
-//!     blob.seek(SeekFrom::Start(0)).unwrap();
+//!     blob.seek(SeekFrom::Start(0))?;
 //!     let mut buf = [0u8; 20];
-//!     let bytes_read = blob.read(&mut buf[..]).unwrap();
+//!     let bytes_read = blob.read(&mut buf[..])?;
 //!     assert_eq!(bytes_read, 10); // note we read 10 bytes because the blob has size 10
 //!
-//!     db.execute("INSERT INTO test (content) VALUES (?)", &[ZeroBlob(64)])
+//!     db.execute("INSERT INTO test (content) VALUES (?)", &[ZeroBlob(64)])?;
-//!         .unwrap();
 //!
 //!     // given a new row ID, we can reopen the blob on that row
 //!     let rowid = db.last_insert_rowid();
-//!     blob.reopen(rowid).unwrap();
+//!     blob.reopen(rowid)?;
 //!
 //!     assert_eq!(blob.size(), 64);
+//!     Ok(())
 //! }
 //! ```
 use std::cmp::min;
@@ -111,7 +108,7 @@ impl Connection {
     }
 }
 
-impl<'conn> Blob<'conn> {
+impl Blob<'_> {
     /// Move a BLOB handle to a new row.
     ///
     /// # Failure
@@ -151,7 +148,7 @@ impl<'conn> Blob<'conn> {
     }
 }
 
-impl<'conn> io::Read for Blob<'conn> {
+impl io::Read for Blob<'_> {
     /// Read data from a BLOB incrementally. Will return Ok(0) if the end of
     /// the blob has been reached.
     ///
@@ -175,7 +172,7 @@ impl<'conn> io::Read for Blob<'conn> {
     }
 }
 
-impl<'conn> io::Write for Blob<'conn> {
+impl io::Write for Blob<'_> {
     /// Write data into a BLOB incrementally. Will return `Ok(0)` if the end of
     /// the blob has been reached; consider using `Write::write_all(buf)`
     /// if you want to get an error if the entirety of the buffer cannot be
@@ -208,7 +205,7 @@ impl<'conn> io::Write for Blob<'conn> {
     }
 }
 
-impl<'conn> io::Seek for Blob<'conn> {
+impl io::Seek for Blob<'_> {
     /// Seek to an offset, in bytes, in BLOB.
     fn seek(&mut self, pos: io::SeekFrom) -> io::Result<u64> {
         let pos = match pos {
@@ -235,7 +232,7 @@ impl<'conn> io::Seek for Blob<'conn> {
 }
 
 #[allow(unused_must_use)]
-impl<'conn> Drop for Blob<'conn> {
+impl Drop for Blob<'_> {
     fn drop(&mut self) {
         self.close_();
     }

src/busy.rs

@@ -75,14 +75,13 @@ impl InnerConnection {
 
 #[cfg(test)]
 mod test {
-    use self::tempdir::TempDir;
     use std::sync::atomic::{AtomicBool, Ordering};
     use std::sync::mpsc::sync_channel;
     use std::thread;
     use std::time::Duration;
-    use tempdir;
+    use tempdir::TempDir;
 
-    use crate::{Connection, Error, ErrorCode, TransactionBehavior, NO_PARAMS};
+    use crate::{Connection, Error, ErrorCode, Result, TransactionBehavior, NO_PARAMS};
 
     #[test]
     fn test_default_busy() {
@@ -94,7 +93,7 @@ mod test {
             .transaction_with_behavior(TransactionBehavior::Exclusive)
             .unwrap();
         let db2 = Connection::open(&path).unwrap();
-        let r = db2.query_row("PRAGMA schema_version", NO_PARAMS, |_| unreachable!());
+        let r: Result<()> = db2.query_row("PRAGMA schema_version", NO_PARAMS, |_| unreachable!());
         match r.unwrap_err() {
             Error::SqliteFailure(err, _) => {
                 assert_eq!(err.code, ErrorCode::DatabaseBusy);
@@ -127,7 +126,7 @@ mod test {
         assert_eq!(tx.recv().unwrap(), 1);
         let _ = db2
             .query_row("PRAGMA schema_version", NO_PARAMS, |row| {
-                row.get_checked::<_, i32>(0)
+                row.get::<_, i32>(0)
             })
             .expect("unexpected error");
 
@@ -137,7 +136,7 @@ mod test {
     #[test]
     #[ignore] // FIXME: unstable
     fn test_busy_handler() {
-        lazy_static! {
+        lazy_static::lazy_static! {
             static ref CALLED: AtomicBool = AtomicBool::new(false);
         }
         fn busy_handler(_: i32) -> bool {
@@ -166,7 +165,7 @@ mod test {
         assert_eq!(tx.recv().unwrap(), 1);
         let _ = db2
             .query_row("PRAGMA schema_version", NO_PARAMS, |row| {
-                row.get_checked::<_, i32>(0)
+                row.get::<_, i32>(0)
             })
             .expect("unexpected error");
         assert_eq!(CALLED.load(Ordering::Relaxed), true);

src/cache.rs

@@ -79,7 +79,7 @@ impl<'conn> DerefMut for CachedStatement<'conn> {
     }
 }
 
-impl<'conn> Drop for CachedStatement<'conn> {
+impl Drop for CachedStatement<'_> {
     #[allow(unused_must_use)]
     fn drop(&mut self) {
         if let Some(stmt) = self.stmt.take() {
@@ -88,8 +88,8 @@ impl<'conn> Drop for CachedStatement<'conn> {
     }
 }
 
-impl<'conn> CachedStatement<'conn> {
+impl CachedStatement<'_> {
-    fn new(stmt: Statement<'conn>, cache: &'conn StatementCache) -> CachedStatement<'conn> {
+    fn new<'conn>(stmt: Statement<'conn>, cache: &'conn StatementCache) -> CachedStatement<'conn> {
         CachedStatement {
             stmt: Some(stmt),
             cache,
@@ -153,6 +153,7 @@ impl StatementCache {
 mod test {
     use super::StatementCache;
     use crate::{Connection, NO_PARAMS};
+    use fallible_iterator::FallibleIterator;
 
     impl StatementCache {
         fn clear(&self) {
@@ -277,12 +278,8 @@ mod test {
         {
             let mut stmt = db.prepare_cached(sql).unwrap();
             assert_eq!(
-                1i32,
+                Ok(Some(1i32)),
-                stmt.query_map::<i32, _, _>(NO_PARAMS, |r| r.get(0))
+                stmt.query(NO_PARAMS).unwrap().map(|r| r.get(0)).next()
-                    .unwrap()
-                    .next()
-                    .unwrap()
-                    .unwrap()
             );
         }
 
@@ -297,12 +294,11 @@ mod test {
         {
             let mut stmt = db.prepare_cached(sql).unwrap();
             assert_eq!(
-                (1i32, 2i32),
+                Ok(Some((1i32, 2i32))),
-                stmt.query_map(NO_PARAMS, |r| (r.get(0), r.get(1)))
+                stmt.query(NO_PARAMS)
                     .unwrap()
+                    .map(|r| Ok((r.get(0)?, r.get(1)?)))
                     .next()
-                    .unwrap()
-                    .unwrap()
             );
         }
     }

src/collation.rs

@@ -0,0 +1,207 @@
+//! Add, remove, or modify a collation
+use std::cmp::Ordering;
+use std::os::raw::{c_char, c_int, c_void};
+use std::panic::{catch_unwind, UnwindSafe};
+use std::ptr;
+use std::slice;
+
+use crate::ffi;
+use crate::{str_to_cstring, Connection, InnerConnection, Result};
+
+// FIXME copy/paste from function.rs
+unsafe extern "C" fn free_boxed_value<T>(p: *mut c_void) {
+    drop(Box::from_raw(p as *mut T));
+}
+
+impl Connection {
+    /// Add or modify a collation.
+    pub fn create_collation<C>(&self, collation_name: &str, x_compare: C) -> Result<()>
+    where
+        C: Fn(&str, &str) -> Ordering + Send + UnwindSafe + 'static,
+    {
+        self.db
+            .borrow_mut()
+            .create_collation(collation_name, x_compare)
+    }
+
+    /// Collation needed callback
+    pub fn collation_needed(
+        &self,
+        x_coll_needed: fn(&Connection, &str) -> Result<()>,
+    ) -> Result<()> {
+        self.db.borrow_mut().collation_needed(x_coll_needed)
+    }
+
+    /// Remove collation.
+    pub fn remove_collation(&self, collation_name: &str) -> Result<()> {
+        self.db.borrow_mut().remove_collation(collation_name)
+    }
+}
+
+impl InnerConnection {
+    fn create_collation<C>(&mut self, collation_name: &str, x_compare: C) -> Result<()>
+    where
+        C: Fn(&str, &str) -> Ordering + Send + UnwindSafe + 'static,
+    {
+        unsafe extern "C" fn call_boxed_closure<C>(
+            arg1: *mut c_void,
+            arg2: c_int,
+            arg3: *const c_void,
+            arg4: c_int,
+            arg5: *const c_void,
+        ) -> c_int
+        where
+            C: Fn(&str, &str) -> Ordering,
+        {
+            use std::str;
+
+            let r = catch_unwind(|| {
+                let boxed_f: *mut C = arg1 as *mut C;
+                assert!(!boxed_f.is_null(), "Internal error - null function pointer");
+                let s1 = {
+                    let c_slice = slice::from_raw_parts(arg3 as *const u8, arg2 as usize);
+                    str::from_utf8_unchecked(c_slice)
+                };
+                let s2 = {
+                    let c_slice = slice::from_raw_parts(arg5 as *const u8, arg4 as usize);
+                    str::from_utf8_unchecked(c_slice)
+                };
+                (*boxed_f)(s1, s2)
+            });
+            let t = match r {
+                Err(_) => {
+                    return -1; // FIXME How ?
+                }
+                Ok(r) => r,
+            };
+
+            match t {
+                Ordering::Less => -1,
+                Ordering::Equal => 0,
+                Ordering::Greater => 1,
+            }
+        }
+
+        let boxed_f: *mut C = Box::into_raw(Box::new(x_compare));
+        let c_name = str_to_cstring(collation_name)?;
+        let flags = ffi::SQLITE_UTF8;
+        let r = unsafe {
+            ffi::sqlite3_create_collation_v2(
+                self.db(),
+                c_name.as_ptr(),
+                flags,
+                boxed_f as *mut c_void,
+                Some(call_boxed_closure::<C>),
+                Some(free_boxed_value::<C>),
+            )
+        };
+        self.decode_result(r)
+    }
+
+    fn collation_needed(
+        &mut self,
+        x_coll_needed: fn(&Connection, &str) -> Result<()>,
+    ) -> Result<()> {
+        use std::mem;
+        unsafe extern "C" fn collation_needed_callback(
+            arg1: *mut c_void,
+            arg2: *mut ffi::sqlite3,
+            e_text_rep: c_int,
+            arg3: *const c_char,
+        ) {
+            use std::ffi::CStr;
+            use std::str;
+
+            if e_text_rep != ffi::SQLITE_UTF8 {
+                // TODO: validate
+                return;
+            }
+
+            let callback: fn(&Connection, &str) -> Result<()> = mem::transmute(arg1);
+            if catch_unwind(|| {
+                let conn = Connection::from_handle(arg2).unwrap();
+                let collation_name = {
+                    let c_slice = CStr::from_ptr(arg3).to_bytes();
+                    str::from_utf8_unchecked(c_slice)
+                };
+                callback(&conn, collation_name)
+            }).is_err() {
+                return; // FIXME How ?
+            }
+        }
+
+        let r = unsafe {
+            ffi::sqlite3_collation_needed(
+                self.db(),
+                mem::transmute(x_coll_needed),
+                Some(collation_needed_callback),
+            )
+        };
+        self.decode_result(r)
+    }
+
+    fn remove_collation(&mut self, collation_name: &str) -> Result<()> {
+        let c_name = str_to_cstring(collation_name)?;
+        let r = unsafe {
+            ffi::sqlite3_create_collation_v2(
+                self.db(),
+                c_name.as_ptr(),
+                ffi::SQLITE_UTF8,
+                ptr::null_mut(),
+                None,
+                None,
+            )
+        };
+        self.decode_result(r)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::{Connection, Result, NO_PARAMS};
+    use fallible_streaming_iterator::FallibleStreamingIterator;
+    use std::cmp::Ordering;
+    use unicase::UniCase;
+
+    fn unicase_compare(s1: &str, s2: &str) -> Ordering {
+        UniCase::new(s1).cmp(&UniCase::new(s2))
+    }
+
+    #[test]
+    fn test_unicase() {
+        let db = Connection::open_in_memory().unwrap();
+
+        db.create_collation("unicase", unicase_compare).unwrap();
+
+        collate(db);
+    }
+
+    fn collate(db: Connection) {
+        db.execute_batch(
+            "CREATE TABLE foo (bar);
+             INSERT INTO foo (bar) VALUES ('Maße');
+             INSERT INTO foo (bar) VALUES ('MASSE');",
+        )
+        .unwrap();
+        let mut stmt = db
+            .prepare("SELECT DISTINCT bar COLLATE unicase FROM foo ORDER BY 1")
+            .unwrap();
+        let rows = stmt.query(NO_PARAMS).unwrap();
+        assert_eq!(rows.count().unwrap(), 1);
+    }
+
+    fn collation_needed(db: &Connection, collation_name: &str) -> Result<()> {
+        if "unicase" == collation_name {
+            db.create_collation(collation_name, unicase_compare)
+        } else {
+            Ok(())
+        }
+    }
+
+    #[test]
+    fn test_collation_needed() {
+        let db = Connection::open_in_memory().unwrap();
+        db.collation_needed(collation_needed).unwrap();
+        collate(db);
+    }
+}

src/column.rs

@@ -0,0 +1,171 @@
+use std::str;
+
+use crate::{Error, Result, Row, Rows, Statement};
+
+/// Information about a column of a SQLite query.
+#[derive(Debug)]
+pub struct Column<'stmt> {
+    name: &'stmt str,
+    decl_type: Option<&'stmt str>,
+}
+
+impl Column<'_> {
+    /// Returns the name of the column.
+    pub fn name(&self) -> &str {
+        self.name
+    }
+
+    /// Returns the type of the column (`None` for expression).
+    pub fn decl_type(&self) -> Option<&str> {
+        self.decl_type
+    }
+}
+
+impl Statement<'_> {
+    /// Get all the column names in the result set of the prepared statement.
+    pub fn column_names(&self) -> Vec<&str> {
+        let n = self.column_count();
+        let mut cols = Vec::with_capacity(n as usize);
+        for i in 0..n {
+            let s = self.column_name(i);
+            cols.push(s);
+        }
+        cols
+    }
+
+    /// Return the number of columns in the result set returned by the prepared
+    /// statement.
+    pub fn column_count(&self) -> usize {
+        self.stmt.column_count()
+    }
+
+    pub(crate) fn column_name(&self, col: usize) -> &str {
+        // Just panic if the bounds are wrong for now, we never call this
+        // without checking first.
+        let slice = self.stmt.column_name(col).expect("Column out of bounds");
+        str::from_utf8(slice.to_bytes()).unwrap()
+    }
+
+    /// Returns the column index in the result set for a given column name.
+    ///
+    /// If there is no AS clause then the name of the column is unspecified and
+    /// may change from one release of SQLite to the next.
+    ///
+    /// # Failure
+    ///
+    /// Will return an `Error::InvalidColumnName` when there is no column with
+    /// the specified `name`.
+    pub fn column_index(&self, name: &str) -> Result<usize> {
+        let bytes = name.as_bytes();
+        let n = self.column_count();
+        for i in 0..n {
+            // Note: `column_name` is only fallible if `i` is out of bounds,
+            // which we've already checked.
+            if bytes.eq_ignore_ascii_case(self.stmt.column_name(i).unwrap().to_bytes()) {
+                return Ok(i);
+            }
+        }
+        Err(Error::InvalidColumnName(String::from(name)))
+    }
+
+    /// Returns a slice describing the columns of the result of the query.
+    pub fn columns<'stmt>(&'stmt self) -> Vec<Column<'stmt>> {
+        let n = self.column_count();
+        let mut cols = Vec::with_capacity(n as usize);
+        for i in 0..n {
+            let name = self.column_name(i);
+            let slice = self.stmt.column_decltype(i);
+            let decl_type = slice.map(|s| str::from_utf8(s.to_bytes()).unwrap());
+            cols.push(Column { name, decl_type });
+        }
+        cols
+    }
+}
+
+impl<'stmt> Rows<'stmt> {
+    /// Get all the column names.
+    pub fn column_names(&self) -> Option<Vec<&str>> {
+        self.stmt.map(Statement::column_names)
+    }
+
+    /// Return the number of columns.
+    pub fn column_count(&self) -> Option<usize> {
+        self.stmt.map(Statement::column_count)
+    }
+
+    /// Returns a slice describing the columns of the Rows.
+    pub fn columns(&self) -> Option<Vec<Column<'stmt>>> {
+        self.stmt.map(Statement::columns)
+    }
+}
+
+impl<'stmt> Row<'stmt> {
+    /// Return the number of columns in the current row.
+    pub fn column_count(&self) -> usize {
+        self.stmt.column_count()
+    }
+
+    /// Returns a slice describing the columns of the Row.
+    pub fn columns(&self) -> Vec<Column<'stmt>> {
+        self.stmt.columns()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Column;
+    use crate::Connection;
+
+    #[test]
+    fn test_columns() {
+        let db = Connection::open_in_memory().unwrap();
+        let query = db.prepare("SELECT * FROM sqlite_master").unwrap();
+        let columns = query.columns();
+        let column_names: Vec<&str> = columns.iter().map(Column::name).collect();
+        assert_eq!(
+            column_names.as_slice(),
+            &["type", "name", "tbl_name", "rootpage", "sql"]
+        );
+        let column_types: Vec<Option<&str>> = columns.iter().map(Column::decl_type).collect();
+        assert_eq!(
+            &column_types[..3],
+            &[Some("text"), Some("text"), Some("text"),]
+        );
+    }
+
+    #[test]
+    fn test_column_name_in_error() {
+        use crate::{types::Type, Error};
+        let db = Connection::open_in_memory().unwrap();
+        db.execute_batch(
+            "BEGIN;
+             CREATE TABLE foo(x INTEGER, y TEXT);
+             INSERT INTO foo VALUES(4, NULL);
+             END;",
+        )
+        .unwrap();
+        let mut stmt = db.prepare("SELECT x as renamed, y FROM foo").unwrap();
+        let mut rows = stmt.query(crate::NO_PARAMS).unwrap();
+        let row = rows.next().unwrap().unwrap();
+        match row.get::<_, String>(0).unwrap_err() {
+            Error::InvalidColumnType(idx, name, ty) => {
+                assert_eq!(idx, 0);
+                assert_eq!(name, "renamed");
+                assert_eq!(ty, Type::Integer);
+            }
+            e => {
+                panic!("Unexpected error type: {:?}", e);
+            }
+        }
+        match row.get::<_, String>("y").unwrap_err() {
+            Error::InvalidColumnType(idx, name, ty) => {
+                assert_eq!(idx, 1);
+                assert_eq!(name, "y");
+                assert_eq!(ty, Type::Null);
+            }
+            e => {
+                panic!("Unexpected error type: {:?}", e);
+            }
+        }
+    }
+}

src/config.rs

@@ -0,0 +1,114 @@
+//! Configure database connections
+
+use std::os::raw::c_int;
+
+use crate::ffi;
+use crate::{Connection, Result};
+
+/// Database Connection Configuration Options
+#[repr(i32)]
+#[allow(non_snake_case, non_camel_case_types)]
+pub enum DbConfig {
+    //SQLITE_DBCONFIG_MAINDBNAME = 1000, /* const char* */
+    //SQLITE_DBCONFIG_LOOKASIDE = 1001,  /* void* int int */
+    SQLITE_DBCONFIG_ENABLE_FKEY = 1002,
+    SQLITE_DBCONFIG_ENABLE_TRIGGER = 1003,
+    SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER = 1004, // 3.12.0
+    //SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION = 1005,
+    SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE = 1006,
+    SQLITE_DBCONFIG_ENABLE_QPSG = 1007, // 3.20.0
+    SQLITE_DBCONFIG_TRIGGER_EQP = 1008,
+    //SQLITE_DBCONFIG_RESET_DATABASE = 1009,
+    SQLITE_DBCONFIG_DEFENSIVE = 1010,
+}
+
+impl Connection {
+    /// Returns the current value of a `config`.
+    ///
+    /// - SQLITE_DBCONFIG_ENABLE_FKEY: return `false` or `true` to indicate
+    ///   whether FK enforcement is off or on
+    /// - SQLITE_DBCONFIG_ENABLE_TRIGGER: return `false` or `true` to indicate
+    ///   whether triggers are disabled or enabled
+    /// - SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER: return `false` or `true` to
+    ///   indicate whether fts3_tokenizer are disabled or enabled
+    /// - SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE: return `false` to indicate
+    ///   checkpoints-on-close are not disabled or `true` if they are
+    /// - SQLITE_DBCONFIG_ENABLE_QPSG: return `false` or `true` to indicate
+    ///   whether the QPSG is disabled or enabled
+    /// - SQLITE_DBCONFIG_TRIGGER_EQP: return `false` to indicate
+    ///   output-for-trigger are not disabled or `true` if it is
+    pub fn db_config(&self, config: DbConfig) -> Result<bool> {
+        let c = self.db.borrow();
+        unsafe {
+            let mut val = 0;
+            check!(ffi::sqlite3_db_config(
+                c.db(),
+                config as c_int,
+                -1,
+                &mut val
+            ));
+            Ok(val != 0)
+        }
+    }
+
+    /// Make configuration changes to a database connection
+    ///
+    /// - SQLITE_DBCONFIG_ENABLE_FKEY: `false` to disable FK enforcement, `true`
+    ///   to enable FK enforcement
+    /// - SQLITE_DBCONFIG_ENABLE_TRIGGER: `false` to disable triggers, `true` to
+    ///   enable triggers
+    /// - SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER: `false` to disable
+    ///   fts3_tokenizer(), `true` to enable fts3_tokenizer()
+    /// - SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE: `false` (the default) to enable
+    ///   checkpoints-on-close, `true` to disable them
+    /// - SQLITE_DBCONFIG_ENABLE_QPSG: `false` to disable the QPSG, `true` to
+    ///   enable QPSG
+    /// - SQLITE_DBCONFIG_TRIGGER_EQP: `false` to disable output for trigger
+    ///   programs, `true` to enable it
+    pub fn set_db_config(&self, config: DbConfig, new_val: bool) -> Result<bool> {
+        let c = self.db.borrow_mut();
+        unsafe {
+            let mut val = 0;
+            check!(ffi::sqlite3_db_config(
+                c.db(),
+                config as c_int,
+                if new_val { 1 } else { 0 },
+                &mut val
+            ));
+            Ok(val != 0)
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::DbConfig;
+    use crate::Connection;
+
+    #[test]
+    fn test_db_config() {
+        let db = Connection::open_in_memory().unwrap();
+
+        let opposite = !db.db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_FKEY).unwrap();
+        assert_eq!(
+            db.set_db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_FKEY, opposite),
+            Ok(opposite)
+        );
+        assert_eq!(
+            db.db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_FKEY),
+            Ok(opposite)
+        );
+
+        let opposite = !db
+            .db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_TRIGGER)
+            .unwrap();
+        assert_eq!(
+            db.set_db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_TRIGGER, opposite),
+            Ok(opposite)
+        );
+        assert_eq!(
+            db.db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_TRIGGER),
+            Ok(opposite)
+        );
+    }
+}

src/context.rs

@@ -7,7 +7,7 @@ use std::rc::Rc;
 use crate::ffi;
 use crate::ffi::sqlite3_context;
 
-use crate::str_to_cstring;
+use crate::str_for_sqlite;
 use crate::types::{ToSqlOutput, ValueRef};
 #[cfg(feature = "array")]
 use crate::vtab::array::{free_array, ARRAY_TYPE};
@@ -38,25 +38,20 @@ pub(crate) unsafe fn set_result(ctx: *mut sqlite3_context, result: &ToSqlOutput<
         ValueRef::Real(r) => ffi::sqlite3_result_double(ctx, r),
         ValueRef::Text(s) => {
             let length = s.len();
-            if length > ::std::i32::MAX as usize {
+            if length > c_int::max_value() as usize {
                 ffi::sqlite3_result_error_toobig(ctx);
             } else {
-                let c_str = match str_to_cstring(s) {
+                let (c_str, len, destructor) = match str_for_sqlite(s) {
                     Ok(c_str) => c_str,
                     // TODO sqlite3_result_error
                     Err(_) => return ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
                 };
-                let destructor = if length > 0 {
+                ffi::sqlite3_result_text(ctx, c_str, len, destructor);
-                    ffi::SQLITE_TRANSIENT()
-                } else {
-                    ffi::SQLITE_STATIC()
-                };
-                ffi::sqlite3_result_text(ctx, c_str.as_ptr(), length as c_int, destructor);
             }
         }
         ValueRef::Blob(b) => {
             let length = b.len();
-            if length > ::std::i32::MAX as usize {
+            if length > c_int::max_value() as usize {
                 ffi::sqlite3_result_error_toobig(ctx);
             } else if length == 0 {
                 ffi::sqlite3_result_zeroblob(ctx, 0)

src/error.rs

@@ -1,3 +1,4 @@
+use crate::types::FromSqlError;
 use crate::types::Type;
 use crate::{errmsg_to_string, ffi};
 use std::error;
@@ -59,7 +60,7 @@ pub enum Error {
     /// Error when the value of a particular column is requested, but the type
     /// of the result in that column cannot be converted to the requested
     /// Rust type.
-    InvalidColumnType(usize, Type),
+    InvalidColumnType(usize, String, Type),
 
     /// Error when a query that was expected to insert one row did not insert
     /// any or insert many.
@@ -119,8 +120,8 @@ impl PartialEq for Error {
             (Error::QueryReturnedNoRows, Error::QueryReturnedNoRows) => true,
             (Error::InvalidColumnIndex(i1), Error::InvalidColumnIndex(i2)) => i1 == i2,
             (Error::InvalidColumnName(n1), Error::InvalidColumnName(n2)) => n1 == n2,
-            (Error::InvalidColumnType(i1, t1), Error::InvalidColumnType(i2, t2)) => {
+            (Error::InvalidColumnType(i1, n1, t1), Error::InvalidColumnType(i2, n2, t2)) => {
-                i1 == i2 && t1 == t2
+                i1 == i2 && t1 == t2 && n1 == n2
             }
             (Error::StatementChangedRows(n1), Error::StatementChangedRows(n2)) => n1 == n2,
             #[cfg(feature = "functions")]
@@ -157,6 +158,32 @@ impl From<::std::ffi::NulError> for Error {
     }
 }
 
+const UNKNOWN_COLUMN: usize = std::usize::MAX;
+
+/// The conversion isn't precise, but it's convenient to have it
+/// to allow use of `get_raw(…).as_…()?` in callbacks that take `Error`.
+impl From<FromSqlError> for Error {
+    fn from(err: FromSqlError) -> Error {
+        // The error type requires index and type fields, but they aren't known in this
+        // context.
+        match err {
+            FromSqlError::OutOfRange(val) => Error::IntegralValueOutOfRange(UNKNOWN_COLUMN, val),
+            #[cfg(feature = "i128_blob")]
+            FromSqlError::InvalidI128Size(_) => {
+                Error::FromSqlConversionFailure(UNKNOWN_COLUMN, Type::Blob, Box::new(err))
+            }
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(_) => {
+                Error::FromSqlConversionFailure(UNKNOWN_COLUMN, Type::Blob, Box::new(err))
+            }
+            FromSqlError::Other(source) => {
+                Error::FromSqlConversionFailure(UNKNOWN_COLUMN, Type::Null, source)
+            }
+            _ => Error::FromSqlConversionFailure(UNKNOWN_COLUMN, Type::Null, Box::new(err)),
+        }
+    }
+}
+
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
@@ -166,13 +193,23 @@ impl fmt::Display for Error {
                 f,
                 "SQLite was compiled or configured for single-threaded use only"
             ),
-            Error::FromSqlConversionFailure(i, ref t, ref err) => write!(
+            Error::FromSqlConversionFailure(i, ref t, ref err) => {
-                f,
+                if i != UNKNOWN_COLUMN {
-                "Conversion error from type {} at index: {}, {}",
+                    write!(
-                t, i, err
+                        f,
-            ),
+                        "Conversion error from type {} at index: {}, {}",
+                        t, i, err
+                    )
+                } else {
+                    err.fmt(f)
+                }
+            }
             Error::IntegralValueOutOfRange(col, val) => {
-                write!(f, "Integer {} out of range at index {}", val, col)
+                if col != UNKNOWN_COLUMN {
+                    write!(f, "Integer {} out of range at index {}", val, col)
+                } else {
+                    write!(f, "Integer {} out of range", val)
+                }
             }
             Error::Utf8Error(ref err) => err.fmt(f),
             Error::NulError(ref err) => err.fmt(f),
@@ -184,9 +221,11 @@ impl fmt::Display for Error {
             Error::QueryReturnedNoRows => write!(f, "Query returned no rows"),
             Error::InvalidColumnIndex(i) => write!(f, "Invalid column index: {}", i),
             Error::InvalidColumnName(ref name) => write!(f, "Invalid column name: {}", name),
-            Error::InvalidColumnType(i, ref t) => {
+            Error::InvalidColumnType(i, ref name, ref t) => write!(
-                write!(f, "Invalid column type {} at index: {}", t, i)
+                f,
-            }
+                "Invalid column type {} at index: {}, name: {}",
+                t, i, name
+            ),
             Error::StatementChangedRows(i) => write!(f, "Query changed {} rows", i),
 
             #[cfg(feature = "functions")]
@@ -232,7 +271,7 @@ impl error::Error for Error {
             Error::QueryReturnedNoRows => "query returned no rows",
             Error::InvalidColumnIndex(_) => "invalid column index",
             Error::InvalidColumnName(_) => "invalid column name",
-            Error::InvalidColumnType(_, _) => "invalid column type",
+            Error::InvalidColumnType(_, _, _) => "invalid column type",
             Error::StatementChangedRows(_) => "query inserted zero or more than one row",
 
             #[cfg(feature = "functions")]
@@ -266,7 +305,7 @@ impl error::Error for Error {
             | Error::QueryReturnedNoRows
             | Error::InvalidColumnIndex(_)
             | Error::InvalidColumnName(_)
-            | Error::InvalidColumnType(_, _)
+            | Error::InvalidColumnType(_, _, _)
             | Error::InvalidPath(_)
             | Error::StatementChangedRows(_)
             | Error::InvalidQuery
@@ -314,7 +353,7 @@ macro_rules! check {
     ($funcall:expr) => {{
         let rc = $funcall;
         if rc != crate::ffi::SQLITE_OK {
-            Err(crate::error::error_from_sqlite_code(rc, None))?;
+            return Err(crate::error::error_from_sqlite_code(rc, None).into());
         }
     }};
 }

src/functions.rs

@@ -11,42 +11,54 @@
 //! ```rust
 //! use regex::Regex;
 //! use rusqlite::{Connection, Error, Result, NO_PARAMS};
-//! use std::collections::HashMap;
 //!
 //! fn add_regexp_function(db: &Connection) -> Result<()> {
-//!     let mut cached_regexes = HashMap::new();
 //!     db.create_scalar_function("regexp", 2, true, move |ctx| {
-//!         let regex_s = ctx.get::<String>(0)?;
+//!         assert_eq!(ctx.len(), 2, "called with unexpected number of arguments");
-//!         let entry = cached_regexes.entry(regex_s.clone());
+//!
-//!         let regex = {
+//!         let saved_re: Option<&Regex> = ctx.get_aux(0)?;
-//!             use std::collections::hash_map::Entry::{Occupied, Vacant};
+//!         let new_re = match saved_re {
-//!             match entry {
+//!             None => {
-//!                 Occupied(occ) => occ.into_mut(),
+//!                 let s = ctx.get::<String>(0)?;
-//!                 Vacant(vac) => match Regex::new(&regex_s) {
+//!                 match Regex::new(&s) {
-//!                     Ok(r) => vac.insert(r),
+//!                     Ok(r) => Some(r),
 //!                     Err(err) => return Err(Error::UserFunctionError(Box::new(err))),
-//!                 },
+//!                 }
 //!             }
+//!             Some(_) => None,
 //!         };
 //!
-//!         let text = ctx.get::<String>(1)?;
+//!         let is_match = {
-//!         Ok(regex.is_match(&text))
+//!             let re = saved_re.unwrap_or_else(|| new_re.as_ref().unwrap());
+//!
+//!             let text = ctx
+//!                 .get_raw(1)
+//!                 .as_str()
+//!                 .map_err(|e| Error::UserFunctionError(e.into()))?;
+//!
+//!             re.is_match(text)
+//!         };
+//!
+//!         if let Some(re) = new_re {
+//!             ctx.set_aux(0, re);
+//!         }
+//!
+//!         Ok(is_match)
 //!     })
 //! }
 //!
-//! fn main() {
+//! fn main() -> Result<()> {
-//!     let db = Connection::open_in_memory().unwrap();
+//!     let db = Connection::open_in_memory()?;
-//!     add_regexp_function(&db).unwrap();
+//!     add_regexp_function(&db)?;
 //!
-//!     let is_match: bool = db
+//!     let is_match: bool = db.query_row(
-//!         .query_row(
+//!         "SELECT regexp('[aeiou]*', 'aaaaeeeiii')",
-//!             "SELECT regexp('[aeiou]*', 'aaaaeeeiii')",
+//!         NO_PARAMS,
-//!             NO_PARAMS,
+//!         |row| row.get(0),
-//!             |row| row.get(0),
+//!     )?;
-//!         )
-//!         .unwrap();
 //!
 //!     assert!(is_match);
+//!     Ok(())
 //! }
 //! ```
 use std::error::Error as StdError;
@@ -104,7 +116,7 @@ pub struct Context<'a> {
     args: &'a [*mut sqlite3_value],
 }
 
-impl<'a> Context<'a> {
+impl Context<'_> {
     /// Returns the number of arguments to the function.
     pub fn len(&self) -> usize {
         self.args.len()
@@ -138,6 +150,10 @@ impl<'a> Context<'a> {
             FromSqlError::InvalidI128Size(_) => {
                 Error::FromSqlConversionFailure(idx, value.data_type(), Box::new(err))
             }
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(_) => {
+                Error::FromSqlConversionFailure(idx, value.data_type(), Box::new(err))
+            }
         })
     }
 
@@ -146,7 +162,7 @@ impl<'a> Context<'a> {
     /// # Failure
     ///
     /// Will panic if `idx` is greater than or equal to `self.len()`.
-    pub fn get_raw(&self, idx: usize) -> ValueRef<'a> {
+    pub fn get_raw(&self, idx: usize) -> ValueRef<'_> {
         let arg = self.args[idx];
         unsafe { ValueRef::from_value(arg) }
     }
@@ -210,6 +226,22 @@ where
     fn finalize(&self, _: Option<A>) -> Result<T>;
 }
 
+/// WindowAggregate is the callback interface for user-defined aggregate window
+/// function.
+#[cfg(feature = "window")]
+pub trait WindowAggregate<A, T>: Aggregate<A, T>
+where
+    A: RefUnwindSafe + UnwindSafe,
+    T: ToSql,
+{
+    /// Returns the current value of the aggregate. Unlike xFinal, the
+    /// implementation should not delete any context.
+    fn value(&self, _: Option<&A>) -> Result<T>;
+
+    /// Removes a row from the current window.
+    fn inverse(&self, _: &mut Context<'_>, _: &mut A) -> Result<()>;
+}
+
 impl Connection {
     /// Attach a user-defined scalar function to this database connection.
     ///
@@ -278,6 +310,24 @@ impl Connection {
             .create_aggregate_function(fn_name, n_arg, deterministic, aggr)
     }
 
+    #[cfg(feature = "window")]
+    pub fn create_window_function<A, W, T>(
+        &self,
+        fn_name: &str,
+        n_arg: c_int,
+        deterministic: bool,
+        aggr: W,
+    ) -> Result<()>
+    where
+        A: RefUnwindSafe + UnwindSafe,
+        W: WindowAggregate<A, T>,
+        T: ToSql,
+    {
+        self.db
+            .borrow_mut()
+            .create_window_function(fn_name, n_arg, deterministic, aggr)
+    }
+
     /// Removes a user-defined function from this database connection.
     ///
     /// `fn_name` and `n_arg` should match the name and number of arguments
@@ -370,105 +420,6 @@ impl InnerConnection {
         D: Aggregate<A, T>,
         T: ToSql,
     {
-        unsafe fn aggregate_context<A>(
-            ctx: *mut sqlite3_context,
-            bytes: usize,
-        ) -> Option<*mut *mut A> {
-            let pac = ffi::sqlite3_aggregate_context(ctx, bytes as c_int) as *mut *mut A;
-            if pac.is_null() {
-                return None;
-            }
-            Some(pac)
-        }
-
-        unsafe extern "C" fn call_boxed_step<A, D, T>(
-            ctx: *mut sqlite3_context,
-            argc: c_int,
-            argv: *mut *mut sqlite3_value,
-        ) where
-            A: RefUnwindSafe + UnwindSafe,
-            D: Aggregate<A, T>,
-            T: ToSql,
-        {
-            let pac = match aggregate_context(ctx, ::std::mem::size_of::<*mut A>()) {
-                Some(pac) => pac,
-                None => {
-                    ffi::sqlite3_result_error_nomem(ctx);
-                    return;
-                }
-            };
-
-            let r = catch_unwind(|| {
-                let boxed_aggr: *mut D = ffi::sqlite3_user_data(ctx) as *mut D;
-                assert!(
-                    !boxed_aggr.is_null(),
-                    "Internal error - null aggregate pointer"
-                );
-                if (*pac as *mut A).is_null() {
-                    *pac = Box::into_raw(Box::new((*boxed_aggr).init()));
-                }
-                let mut ctx = Context {
-                    ctx,
-                    args: slice::from_raw_parts(argv, argc as usize),
-                };
-                (*boxed_aggr).step(&mut ctx, &mut **pac)
-            });
-            let r = match r {
-                Err(_) => {
-                    report_error(ctx, &Error::UnwindingPanic);
-                    return;
-                }
-                Ok(r) => r,
-            };
-            match r {
-                Ok(_) => {}
-                Err(err) => report_error(ctx, &err),
-            };
-        }
-
-        unsafe extern "C" fn call_boxed_final<A, D, T>(ctx: *mut sqlite3_context)
-        where
-            A: RefUnwindSafe + UnwindSafe,
-            D: Aggregate<A, T>,
-            T: ToSql,
-        {
-            // Within the xFinal callback, it is customary to set N=0 in calls to
-            // sqlite3_aggregate_context(C,N) so that no pointless memory allocations occur.
-            let a: Option<A> = match aggregate_context(ctx, 0) {
-                Some(pac) => {
-                    if (*pac as *mut A).is_null() {
-                        None
-                    } else {
-                        let a = Box::from_raw(*pac);
-                        Some(*a)
-                    }
-                }
-                None => None,
-            };
-
-            let r = catch_unwind(|| {
-                let boxed_aggr: *mut D = ffi::sqlite3_user_data(ctx) as *mut D;
-                assert!(
-                    !boxed_aggr.is_null(),
-                    "Internal error - null aggregate pointer"
-                );
-                (*boxed_aggr).finalize(a)
-            });
-            let t = match r {
-                Err(_) => {
-                    report_error(ctx, &Error::UnwindingPanic);
-                    return;
-                }
-                Ok(r) => r,
-            };
-            let t = t.as_ref().map(|t| ToSql::to_sql(t));
-            match t {
-                Ok(Ok(ref value)) => set_result(ctx, value),
-                Ok(Err(err)) => report_error(ctx, &err),
-                Err(err) => report_error(ctx, err),
-            }
-        }
-
         let boxed_aggr: *mut D = Box::into_raw(Box::new(aggr));
         let c_name = str_to_cstring(fn_name)?;
         let mut flags = ffi::SQLITE_UTF8;
@@ -491,6 +442,42 @@ impl InnerConnection {
         self.decode_result(r)
     }
 
+    #[cfg(feature = "window")]
+    fn create_window_function<A, W, T>(
+        &mut self,
+        fn_name: &str,
+        n_arg: c_int,
+        deterministic: bool,
+        aggr: W,
+    ) -> Result<()>
+    where
+        A: RefUnwindSafe + UnwindSafe,
+        W: WindowAggregate<A, T>,
+        T: ToSql,
+    {
+        let boxed_aggr: *mut W = Box::into_raw(Box::new(aggr));
+        let c_name = str_to_cstring(fn_name)?;
+        let mut flags = ffi::SQLITE_UTF8;
+        if deterministic {
+            flags |= ffi::SQLITE_DETERMINISTIC;
+        }
+        let r = unsafe {
+            ffi::sqlite3_create_window_function(
+                self.db(),
+                c_name.as_ptr(),
+                n_arg,
+                flags,
+                boxed_aggr as *mut c_void,
+                Some(call_boxed_step::<A, W, T>),
+                Some(call_boxed_final::<A, W, T>),
+                Some(call_boxed_value::<A, W, T>),
+                Some(call_boxed_inverse::<A, W, T>),
+                Some(free_boxed_value::<W>),
+            )
+        };
+        self.decode_result(r)
+    }
+
     fn remove_function(&mut self, fn_name: &str, n_arg: c_int) -> Result<()> {
         let c_name = str_to_cstring(fn_name)?;
         let r = unsafe {
@@ -510,15 +497,197 @@ impl InnerConnection {
     }
 }
 
+unsafe fn aggregate_context<A>(ctx: *mut sqlite3_context, bytes: usize) -> Option<*mut *mut A> {
+    let pac = ffi::sqlite3_aggregate_context(ctx, bytes as c_int) as *mut *mut A;
+    if pac.is_null() {
+        return None;
+    }
+    Some(pac)
+}
+
+unsafe extern "C" fn call_boxed_step<A, D, T>(
+    ctx: *mut sqlite3_context,
+    argc: c_int,
+    argv: *mut *mut sqlite3_value,
+) where
+    A: RefUnwindSafe + UnwindSafe,
+    D: Aggregate<A, T>,
+    T: ToSql,
+{
+    let pac = match aggregate_context(ctx, ::std::mem::size_of::<*mut A>()) {
+        Some(pac) => pac,
+        None => {
+            ffi::sqlite3_result_error_nomem(ctx);
+            return;
+        }
+    };
+
+    let r = catch_unwind(|| {
+        let boxed_aggr: *mut D = ffi::sqlite3_user_data(ctx) as *mut D;
+        assert!(
+            !boxed_aggr.is_null(),
+            "Internal error - null aggregate pointer"
+        );
+        if (*pac as *mut A).is_null() {
+            *pac = Box::into_raw(Box::new((*boxed_aggr).init()));
+        }
+        let mut ctx = Context {
+            ctx,
+            args: slice::from_raw_parts(argv, argc as usize),
+        };
+        (*boxed_aggr).step(&mut ctx, &mut **pac)
+    });
+    let r = match r {
+        Err(_) => {
+            report_error(ctx, &Error::UnwindingPanic);
+            return;
+        }
+        Ok(r) => r,
+    };
+    match r {
+        Ok(_) => {}
+        Err(err) => report_error(ctx, &err),
+    };
+}
+
+#[cfg(feature = "window")]
+unsafe extern "C" fn call_boxed_inverse<A, W, T>(
+    ctx: *mut sqlite3_context,
+    argc: c_int,
+    argv: *mut *mut sqlite3_value,
+) where
+    A: RefUnwindSafe + UnwindSafe,
+    W: WindowAggregate<A, T>,
+    T: ToSql,
+{
+    let pac = match aggregate_context(ctx, ::std::mem::size_of::<*mut A>()) {
+        Some(pac) => pac,
+        None => {
+            ffi::sqlite3_result_error_nomem(ctx);
+            return;
+        }
+    };
+
+    let r = catch_unwind(|| {
+        let boxed_aggr: *mut W = ffi::sqlite3_user_data(ctx) as *mut W;
+        assert!(
+            !boxed_aggr.is_null(),
+            "Internal error - null aggregate pointer"
+        );
+        let mut ctx = Context {
+            ctx,
+            args: slice::from_raw_parts(argv, argc as usize),
+        };
+        (*boxed_aggr).inverse(&mut ctx, &mut **pac)
+    });
+    let r = match r {
+        Err(_) => {
+            report_error(ctx, &Error::UnwindingPanic);
+            return;
+        }
+        Ok(r) => r,
+    };
+    match r {
+        Ok(_) => {}
+        Err(err) => report_error(ctx, &err),
+    };
+}
+
+unsafe extern "C" fn call_boxed_final<A, D, T>(ctx: *mut sqlite3_context)
+where
+    A: RefUnwindSafe + UnwindSafe,
+    D: Aggregate<A, T>,
+    T: ToSql,
+{
+    // Within the xFinal callback, it is customary to set N=0 in calls to
+    // sqlite3_aggregate_context(C,N) so that no pointless memory allocations occur.
+    let a: Option<A> = match aggregate_context(ctx, 0) {
+        Some(pac) => {
+            if (*pac as *mut A).is_null() {
+                None
+            } else {
+                let a = Box::from_raw(*pac);
+                Some(*a)
+            }
+        }
+        None => None,
+    };
+
+    let r = catch_unwind(|| {
+        let boxed_aggr: *mut D = ffi::sqlite3_user_data(ctx) as *mut D;
+        assert!(
+            !boxed_aggr.is_null(),
+            "Internal error - null aggregate pointer"
+        );
+        (*boxed_aggr).finalize(a)
+    });
+    let t = match r {
+        Err(_) => {
+            report_error(ctx, &Error::UnwindingPanic);
+            return;
+        }
+        Ok(r) => r,
+    };
+    let t = t.as_ref().map(|t| ToSql::to_sql(t));
+    match t {
+        Ok(Ok(ref value)) => set_result(ctx, value),
+        Ok(Err(err)) => report_error(ctx, &err),
+        Err(err) => report_error(ctx, err),
+    }
+}
+
+#[cfg(feature = "window")]
+unsafe extern "C" fn call_boxed_value<A, W, T>(ctx: *mut sqlite3_context)
+where
+    A: RefUnwindSafe + UnwindSafe,
+    W: WindowAggregate<A, T>,
+    T: ToSql,
+{
+    // Within the xValue callback, it is customary to set N=0 in calls to
+    // sqlite3_aggregate_context(C,N) so that no pointless memory allocations occur.
+    let a: Option<&A> = match aggregate_context(ctx, 0) {
+        Some(pac) => {
+            if (*pac as *mut A).is_null() {
+                None
+            } else {
+                let a = &**pac;
+                Some(a)
+            }
+        }
+        None => None,
+    };
+
+    let r = catch_unwind(|| {
+        let boxed_aggr: *mut W = ffi::sqlite3_user_data(ctx) as *mut W;
+        assert!(
+            !boxed_aggr.is_null(),
+            "Internal error - null aggregate pointer"
+        );
+        (*boxed_aggr).value(a)
+    });
+    let t = match r {
+        Err(_) => {
+            report_error(ctx, &Error::UnwindingPanic);
+            return;
+        }
+        Ok(r) => r,
+    };
+    let t = t.as_ref().map(|t| ToSql::to_sql(t));
+    match t {
+        Ok(Ok(ref value)) => set_result(ctx, value),
+        Ok(Err(err)) => report_error(ctx, &err),
+        Err(err) => report_error(ctx, err),
+    }
+}
+
 #[cfg(test)]
 mod test {
-    use regex;
+    use regex::Regex;
-
-    use self::regex::Regex;
-    use std::collections::HashMap;
     use std::f64::EPSILON;
     use std::os::raw::c_double;
 
+    #[cfg(feature = "window")]
+    use crate::functions::WindowAggregate;
     use crate::functions::{Aggregate, Context};
     use crate::{Connection, Error, Result, NO_PARAMS};
 
@@ -616,60 +785,6 @@ mod test {
         assert_eq!(2, result.unwrap());
     }
 
-    #[test]
-    fn test_function_regexp_with_hashmap_cache() {
-        let db = Connection::open_in_memory().unwrap();
-        db.execute_batch(
-            "BEGIN;
-             CREATE TABLE foo (x string);
-             INSERT INTO foo VALUES ('lisa');
-             INSERT INTO foo VALUES ('lXsi');
-             INSERT INTO foo VALUES ('lisX');
-             END;",
-        )
-        .unwrap();
-
-        // This implementation of a regexp scalar function uses a captured HashMap
-        // to keep cached regular expressions around (even across multiple queries)
-        // until the function is removed.
-        let mut cached_regexes = HashMap::new();
-        db.create_scalar_function("regexp", 2, true, move |ctx| {
-            assert_eq!(ctx.len(), 2, "called with unexpected number of arguments");
-
-            let regex_s = ctx.get::<String>(0)?;
-            let entry = cached_regexes.entry(regex_s.clone());
-            let regex = {
-                use std::collections::hash_map::Entry::{Occupied, Vacant};
-                match entry {
-                    Occupied(occ) => occ.into_mut(),
-                    Vacant(vac) => match Regex::new(&regex_s) {
-                        Ok(r) => vac.insert(r),
-                        Err(err) => return Err(Error::UserFunctionError(Box::new(err))),
-                    },
-                }
-            };
-
-            let text = ctx.get::<String>(1)?;
-            Ok(regex.is_match(&text))
-        })
-        .unwrap();
-
-        let result: Result<bool> =
-            db.query_row("SELECT regexp('l.s[aeiouy]', 'lisa')", NO_PARAMS, |r| {
-                r.get(0)
-            });
-
-        assert_eq!(true, result.unwrap());
-
-        let result: Result<i64> = db.query_row(
-            "SELECT COUNT(*) FROM foo WHERE regexp('l.s[aeiouy]', x) == 1",
-            NO_PARAMS,
-            |r| r.get(0),
-        );
-
-        assert_eq!(2, result.unwrap());
-    }
-
     #[test]
     fn test_varargs_function() {
         let db = Connection::open_in_memory().unwrap();
@@ -771,7 +886,7 @@ mod test {
         let dual_sum = "SELECT my_sum(i), my_sum(j) FROM (SELECT 2 AS i, 1 AS j UNION ALL SELECT \
                         2, 1)";
         let result: (i64, i64) = db
-            .query_row(dual_sum, NO_PARAMS, |r| (r.get(0), r.get(1)))
+            .query_row(dual_sum, NO_PARAMS, |r| Ok((r.get(0)?, r.get(1)?)))
             .unwrap();
         assert_eq!((4, 2), result);
     }
@@ -791,4 +906,58 @@ mod test {
         let result: i64 = db.query_row(single_sum, NO_PARAMS, |r| r.get(0)).unwrap();
         assert_eq!(2, result);
     }
+
+    #[cfg(feature = "window")]
+    impl WindowAggregate<i64, Option<i64>> for Sum {
+        fn inverse(&self, ctx: &mut Context<'_>, sum: &mut i64) -> Result<()> {
+            *sum -= ctx.get::<i64>(0)?;
+            Ok(())
+        }
+
+        fn value(&self, sum: Option<&i64>) -> Result<Option<i64>> {
+            Ok(sum.copied())
+        }
+    }
+
+    #[test]
+    #[cfg(feature = "window")]
+    fn test_window() {
+        use fallible_iterator::FallibleIterator;
+
+        let db = Connection::open_in_memory().unwrap();
+        db.create_window_function("sumint", 1, true, Sum).unwrap();
+        db.execute_batch(
+            "CREATE TABLE t3(x, y);
+             INSERT INTO t3 VALUES('a', 4),
+                     ('b', 5),
+                     ('c', 3),
+                     ('d', 8),
+                     ('e', 1);",
+        )
+        .unwrap();
+
+        let mut stmt = db
+            .prepare(
+                "SELECT x, sumint(y) OVER (
+                   ORDER BY x ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING
+                 ) AS sum_y
+                 FROM t3 ORDER BY x;",
+            )
+            .unwrap();
+
+        let results: Vec<(String, i64)> = stmt
+            .query(NO_PARAMS)
+            .unwrap()
+            .map(|row| Ok((row.get("x")?, row.get("sum_y")?)))
+            .collect()
+            .unwrap();
+        let expected = vec![
+            ("a".to_owned(), 9),
+            ("b".to_owned(), 12),
+            ("c".to_owned(), 16),
+            ("d".to_owned(), 12),
+            ("e".to_owned(), 9),
+        ];
+        assert_eq!(expected, results);
+    }
 }

src/hooks.rs

@@ -236,6 +236,7 @@ fn free_boxed_hook<F>(p: *mut c_void) {
 mod test {
     use super::Action;
     use crate::Connection;
+    use lazy_static::lazy_static;
     use std::sync::atomic::{AtomicBool, Ordering};
 
     #[test]

src/inner_connection.rs

@@ -1,15 +1,15 @@
 use std::ffi::CString;
-use std::mem;
+use std::mem::MaybeUninit;
 use std::os::raw::c_int;
 #[cfg(feature = "load_extension")]
 use std::path::Path;
 use std::ptr;
 use std::str;
-use std::sync::atomic::{AtomicBool, Ordering, ATOMIC_BOOL_INIT};
+use std::sync::atomic::{AtomicBool, Ordering};
-use std::sync::{Arc, Mutex, Once, ONCE_INIT};
+use std::sync::{Arc, Mutex, Once};
 
 use super::ffi;
-use super::str_to_cstring;
+use super::{str_for_sqlite, str_to_cstring};
 use super::{Connection, InterruptHandle, OpenFlags, Result};
 use crate::error::{error_from_handle, error_from_sqlite_code, Error};
 use crate::raw_statement::RawStatement;
@@ -78,8 +78,10 @@ impl InnerConnection {
         }
 
         unsafe {
-            let mut db: *mut ffi::sqlite3 = mem::uninitialized();
+            let mut db = MaybeUninit::uninit();
-            let r = ffi::sqlite3_open_v2(c_path.as_ptr(), &mut db, flags.bits(), ptr::null());
+            let r =
+                ffi::sqlite3_open_v2(c_path.as_ptr(), db.as_mut_ptr(), flags.bits(), ptr::null());
+            let db: *mut ffi::sqlite3 = db.assume_init();
             if r != ffi::SQLITE_OK {
                 let e = if db.is_null() {
                     error_from_sqlite_code(r, None)
@@ -180,21 +182,27 @@ impl InnerConnection {
 
         let dylib_str = super::path_to_cstring(dylib_path)?;
         unsafe {
-            let mut errmsg: *mut c_char = mem::uninitialized();
+            let mut errmsg = MaybeUninit::uninit();
             let r = if let Some(entry_point) = entry_point {
                 let c_entry = str_to_cstring(entry_point)?;
                 ffi::sqlite3_load_extension(
                     self.db,
                     dylib_str.as_ptr(),
                     c_entry.as_ptr(),
-                    &mut errmsg,
+                    errmsg.as_mut_ptr(),
                 )
             } else {
-                ffi::sqlite3_load_extension(self.db, dylib_str.as_ptr(), ptr::null(), &mut errmsg)
+                ffi::sqlite3_load_extension(
+                    self.db,
+                    dylib_str.as_ptr(),
+                    ptr::null(),
+                    errmsg.as_mut_ptr(),
+                )
             };
             if r == ffi::SQLITE_OK {
                 Ok(())
             } else {
+                let errmsg: *mut c_char = errmsg.assume_init();
                 let message = super::errmsg_to_string(&*errmsg);
                 ffi::sqlite3_free(errmsg as *mut ::std::os::raw::c_void);
                 Err(error_from_sqlite_code(r, Some(message)))
@@ -207,12 +215,8 @@ impl InnerConnection {
     }
 
     pub fn prepare<'a>(&mut self, conn: &'a Connection, sql: &str) -> Result<Statement<'a>> {
-        if sql.len() >= ::std::i32::MAX as usize {
+        let mut c_stmt = MaybeUninit::uninit();
-            return Err(error_from_sqlite_code(ffi::SQLITE_TOOBIG, None));
+        let (c_sql, len, _) = str_for_sqlite(sql.as_bytes())?;
-        }
-        let mut c_stmt: *mut ffi::sqlite3_stmt = unsafe { mem::uninitialized() };
-        let c_sql = str_to_cstring(sql)?;
-        let len_with_nul = (sql.len() + 1) as c_int;
         let mut c_tail = ptr::null();
         let r = unsafe {
             if cfg!(feature = "unlock_notify") {
@@ -220,9 +224,9 @@ impl InnerConnection {
                 loop {
                     rc = ffi::sqlite3_prepare_v2(
                         self.db(),
-                        c_sql.as_ptr(),
+                        c_sql,
-                        len_with_nul,
+                        len,
-                        &mut c_stmt,
+                        c_stmt.as_mut_ptr(),
                         &mut c_tail,
                     );
                     if !unlock_notify::is_locked(self.db, rc) {
@@ -235,15 +239,10 @@ impl InnerConnection {
                 }
                 rc
             } else {
-                ffi::sqlite3_prepare_v2(
+                ffi::sqlite3_prepare_v2(self.db(), c_sql, len, c_stmt.as_mut_ptr(), &mut c_tail)
-                    self.db(),
-                    c_sql.as_ptr(),
-                    len_with_nul,
-                    &mut c_stmt,
-                    &mut c_tail,
-                )
             }
         };
+        let c_stmt: *mut ffi::sqlite3_stmt = unsafe { c_stmt.assume_init() };
         if !c_tail.is_null() && unsafe { *c_tail == 0 } {
             // '\0' when there is no ';' at the end
             c_tail = ptr::null(); // TODO ignore spaces, comments, ... at the end
@@ -295,9 +294,9 @@ impl Drop for InnerConnection {
 }
 
 #[cfg(not(feature = "bundled"))]
-static SQLITE_VERSION_CHECK: Once = ONCE_INIT;
+static SQLITE_VERSION_CHECK: Once = Once::new();
 #[cfg(not(feature = "bundled"))]
-pub static BYPASS_VERSION_CHECK: AtomicBool = ATOMIC_BOOL_INIT;
+pub static BYPASS_VERSION_CHECK: AtomicBool = AtomicBool::new(false);
 
 #[cfg(not(feature = "bundled"))]
 fn ensure_valid_sqlite_version() {
@@ -343,8 +342,8 @@ rusqlite was built against SQLite {} but the runtime SQLite version is {}. To fi
     });
 }
 
-static SQLITE_INIT: Once = ONCE_INIT;
+static SQLITE_INIT: Once = Once::new();
-pub static BYPASS_SQLITE_INIT: AtomicBool = ATOMIC_BOOL_INIT;
+pub static BYPASS_SQLITE_INIT: AtomicBool = AtomicBool::new(false);
 
 fn ensure_safe_sqlite_threading_mode() -> Result<()> {
     // Ensure SQLite was compiled in thredsafe mode.

src/lib.rs

@@ -3,7 +3,7 @@
 //!
 //! ```rust
 //! use rusqlite::types::ToSql;
-//! use rusqlite::{params, Connection};
+//! use rusqlite::{params, Connection, Result};
 //! use time::Timespec;
 //!
 //! #[derive(Debug)]
@@ -14,8 +14,8 @@
 //!     data: Option<Vec<u8>>,
 //! }
 //!
-//! fn main() {
+//! fn main() -> Result<()> {
-//!     let conn = Connection::open_in_memory().unwrap();
+//!     let conn = Connection::open_in_memory()?;
 //!
 //!     conn.execute(
 //!         "CREATE TABLE person (
@@ -25,8 +25,7 @@
 //!                   data            BLOB
 //!                   )",
 //!         params![],
-//!     )
+//!     )?;
-//!     .unwrap();
 //!     let me = Person {
 //!         id: 0,
 //!         name: "Steven".to_string(),
@@ -37,36 +36,28 @@
 //!         "INSERT INTO person (name, time_created, data)
 //!                   VALUES (?1, ?2, ?3)",
 //!         params![me.name, me.time_created, me.data],
-//!     )
+//!     )?;
-//!     .unwrap();
 //!
-//!     let mut stmt = conn
+//!     let mut stmt = conn.prepare("SELECT id, name, time_created, data FROM person")?;
-//!         .prepare("SELECT id, name, time_created, data FROM person")
+//!     let person_iter = stmt.query_map(params![], |row| {
-//!         .unwrap();
+//!         Ok(Person {
-//!     let person_iter = stmt
+//!             id: row.get(0)?,
-//!         .query_map(params![], |row| Person {
+//!             name: row.get(1)?,
-//!             id: row.get(0),
+//!             time_created: row.get(2)?,
-//!             name: row.get(1),
+//!             data: row.get(3)?,
-//!             time_created: row.get(2),
-//!             data: row.get(3),
 //!         })
-//!         .unwrap();
+//!     })?;
 //!
 //!     for person in person_iter {
 //!         println!("Found person {:?}", person.unwrap());
 //!     }
+//!     Ok(())
 //! }
 //! ```
 #![allow(unknown_lints)]
 
 pub use libsqlite3_sys as ffi;
 
-#[macro_use]
-extern crate bitflags;
-#[cfg(any(test, feature = "vtab"))]
-#[macro_use]
-extern crate lazy_static;
-
 use std::cell::RefCell;
 use std::convert;
 use std::default::Default;
@@ -86,10 +77,11 @@ use crate::raw_statement::RawStatement;
 use crate::types::ValueRef;
 
 pub use crate::cache::CachedStatement;
+pub use crate::column::Column;
 pub use crate::error::Error;
 pub use crate::ffi::ErrorCode;
 #[cfg(feature = "hooks")]
-pub use crate::hooks::*;
+pub use crate::hooks::Action;
 #[cfg(feature = "load_extension")]
 pub use crate::load_extension_guard::LoadExtensionGuard;
 pub use crate::row::{AndThenRows, MappedRows, Row, RowIndex, Rows};
@@ -98,16 +90,21 @@ pub use crate::transaction::{DropBehavior, Savepoint, Transaction, TransactionBe
 pub use crate::types::ToSql;
 pub use crate::version::*;
 
+#[macro_use]
+mod error;
+
 #[cfg(feature = "backup")]
 pub mod backup;
 #[cfg(feature = "blob")]
 pub mod blob;
 mod busy;
 mod cache;
+#[cfg(feature = "collation")]
+mod collation;
+mod column;
+pub mod config;
 #[cfg(any(feature = "functions", feature = "vtab"))]
 mod context;
-#[macro_use]
-mod error;
 #[cfg(feature = "functions")]
 pub mod functions;
 #[cfg(feature = "hooks")]
@@ -117,6 +114,7 @@ mod inner_connection;
 pub mod limits;
 #[cfg(feature = "load_extension")]
 mod load_extension_guard;
+mod pragma;
 mod raw_statement;
 mod row;
 #[cfg(feature = "session")]
@@ -238,6 +236,42 @@ fn str_to_cstring(s: &str) -> Result<CString> {
     Ok(CString::new(s)?)
 }
 
+/// Returns `Ok((string ptr, len as c_int, SQLITE_STATIC | SQLITE_TRANSIENT))`
+/// normally.
+/// Returns errors if the string has embedded nuls or is too large for sqlite.
+/// The `sqlite3_destructor_type` item is always `SQLITE_TRANSIENT` unless
+/// the string was empty (in which case it's `SQLITE_STATIC`, and the ptr is
+/// static).
+fn str_for_sqlite(s: &[u8]) -> Result<(*const c_char, c_int, ffi::sqlite3_destructor_type)> {
+    let len = len_as_c_int(s.len())?;
+    if memchr::memchr(0, s).is_none() {
+        let (ptr, dtor_info) = if len != 0 {
+            (s.as_ptr() as *const c_char, ffi::SQLITE_TRANSIENT())
+        } else {
+            // Return a pointer guaranteed to live forever
+            ("".as_ptr() as *const c_char, ffi::SQLITE_STATIC())
+        };
+        Ok((ptr, len, dtor_info))
+    } else {
+        // There's an embedded nul, so we fabricate a NulError.
+        let e = CString::new(s);
+        Err(Error::NulError(e.unwrap_err()))
+    }
+}
+
+// Helper to cast to c_int safely, returning the correct error type if the cast
+// failed.
+fn len_as_c_int(len: usize) -> Result<c_int> {
+    if len >= (c_int::max_value() as usize) {
+        Err(Error::SqliteFailure(
+            ffi::Error::new(ffi::SQLITE_TOOBIG),
+            None,
+        ))
+    } else {
+        Ok(len as c_int)
+    }
+}
+
 fn path_to_cstring(p: &Path) -> Result<CString> {
     let s = p.to_str().ok_or_else(|| Error::InvalidPath(p.to_owned()))?;
     str_to_cstring(s)
@@ -264,7 +298,7 @@ pub enum DatabaseName<'a> {
     feature = "session",
     feature = "bundled"
 ))]
-impl<'a> DatabaseName<'a> {
+impl DatabaseName<'_> {
     fn to_cstring(&self) -> Result<CString> {
         use self::DatabaseName::{Attached, Main, Temp};
         match *self {
@@ -298,6 +332,16 @@ impl Connection {
     /// OpenFlags::SQLITE_OPEN_READ_WRITE |
     /// OpenFlags::SQLITE_OPEN_CREATE)`.
     ///
+    /// ```rust,no_run
+    /// # use rusqlite::{Connection, Result};
+    /// fn open_my_db() -> Result<()> {
+    ///     let path = "./my_db.db3";
+    ///     let db = Connection::open(&path)?;
+    ///     println!("{}", db.is_autocommit());
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
     /// # Failure
     ///
     /// Will return `Err` if `path` cannot be converted to a C-compatible
@@ -477,7 +521,7 @@ impl Connection {
     where
         P: IntoIterator,
         P::Item: ToSql,
-        F: FnOnce(&Row<'_, '_>) -> T,
+        F: FnOnce(&Row<'_>) -> Result<T>,
     {
         let mut stmt = self.prepare(sql)?;
         stmt.check_no_tail()?;
@@ -500,13 +544,11 @@ impl Connection {
     /// or if the underlying SQLite call fails.
     pub fn query_row_named<T, F>(&self, sql: &str, params: &[(&str, &dyn ToSql)], f: F) -> Result<T>
     where
-        F: FnOnce(&Row<'_, '_>) -> T,
+        F: FnOnce(&Row<'_>) -> Result<T>,
     {
         let mut stmt = self.prepare(sql)?;
         stmt.check_no_tail()?;
-        let mut rows = stmt.query_named(params)?;
+        stmt.query_row_named(params, f)
-
-        rows.get_expected_row().map(|r| f(&r))
     }
 
     /// Convenience method to execute a query that is expected to return a
@@ -522,7 +564,7 @@ impl Connection {
     ///     conn.query_row_and_then(
     ///         "SELECT value FROM preferences WHERE name='locale'",
     ///         NO_PARAMS,
-    ///         |row| row.get_checked(0),
+    ///         |row| row.get(0),
     ///     )
     /// }
     /// ```
@@ -538,7 +580,7 @@ impl Connection {
     where
         P: IntoIterator,
         P::Item: ToSql,
-        F: FnOnce(&Row<'_, '_>) -> result::Result<T, E>,
+        F: FnOnce(&Row<'_>) -> result::Result<T, E>,
         E: convert::From<Error>,
     {
         let mut stmt = self.prepare(sql)?;
@@ -694,7 +736,7 @@ impl Connection {
     /// Return the number of rows modified, inserted or deleted by the most
     /// recently completed INSERT, UPDATE or DELETE statement on the database
     /// connection.
-    pub fn changes(&self) -> usize {
+    fn changes(&self) -> usize {
         self.db.borrow_mut().changes()
     }
 
@@ -719,7 +761,7 @@ impl fmt::Debug for Connection {
     }
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[doc = "Flags for opening SQLite database connections."]
     #[doc = "See [sqlite3_open_v2](http://www.sqlite.org/c3ref/open.html) for details."]
     #[repr(C)]
@@ -814,12 +856,12 @@ unsafe fn db_filename(_: *mut ffi::sqlite3) -> Option<PathBuf> {
 
 #[cfg(test)]
 mod test {
-    use self::tempdir::TempDir;
+    use super::*;
-    pub use super::*;
     use crate::ffi;
-    pub use std::error::Error as StdError;
+    use fallible_iterator::FallibleIterator;
-    pub use std::fmt;
+    use std::error::Error as StdError;
-    use tempdir;
+    use std::fmt;
+    use tempdir::TempDir;
 
     // this function is never called, but is still type checked; in
     // particular, calls with specific instantiations will require
@@ -854,8 +896,8 @@ mod test {
             )
             .expect("create temp db");
 
-        let mut db1 = Connection::open(&path).unwrap();
+        let mut db1 = Connection::open_with_flags(&path, OpenFlags::SQLITE_OPEN_READ_WRITE).unwrap();
-        let mut db2 = Connection::open(&path).unwrap();
+        let mut db2 = Connection::open_with_flags(&path, OpenFlags::SQLITE_OPEN_READ_ONLY).unwrap();
 
         db1.busy_timeout(Duration::from_millis(0)).unwrap();
         db2.busy_timeout(Duration::from_millis(0)).unwrap();
@@ -865,9 +907,9 @@ mod test {
             let tx2 = db2.transaction().unwrap();
 
             // SELECT first makes sqlite lock with a shared lock
-            tx1.query_row("SELECT x FROM foo LIMIT 1", NO_PARAMS, |_| ())
+            tx1.query_row("SELECT x FROM foo LIMIT 1", NO_PARAMS, |_| Ok(()))
                 .unwrap();
-            tx2.query_row("SELECT x FROM foo LIMIT 1", NO_PARAMS, |_| ())
+            tx2.query_row("SELECT x FROM foo LIMIT 1", NO_PARAMS, |_| Ok(()))
                 .unwrap();
 
             tx1.execute("INSERT INTO foo VALUES(?1)", &[1]).unwrap();
@@ -923,23 +965,24 @@ mod test {
         // statement first.
         let raw_stmt = {
             use super::str_to_cstring;
-            use std::mem;
+            use std::mem::MaybeUninit;
             use std::os::raw::c_int;
             use std::ptr;
 
             let raw_db = db.db.borrow_mut().db;
             let sql = "SELECT 1";
-            let mut raw_stmt: *mut ffi::sqlite3_stmt = unsafe { mem::uninitialized() };
+            let mut raw_stmt = MaybeUninit::uninit();
             let rc = unsafe {
                 ffi::sqlite3_prepare_v2(
                     raw_db,
                     str_to_cstring(sql).unwrap().as_ptr(),
                     (sql.len() + 1) as c_int,
-                    &mut raw_stmt,
+                    raw_stmt.as_mut_ptr(),
                     ptr::null_mut(),
                 )
             };
             assert_eq!(rc, ffi::SQLITE_OK);
+            let raw_stmt: *mut ffi::sqlite3_stmt = unsafe { raw_stmt.assume_init() };
             raw_stmt
         };
 
@@ -1081,8 +1124,8 @@ mod test {
             let mut rows = query.query(&[4i32]).unwrap();
             let mut v = Vec::<i32>::new();
 
-            while let Some(row) = rows.next() {
+            while let Some(row) = rows.next().unwrap() {
-                v.push(row.unwrap().get(0));
+                v.push(row.get(0).unwrap());
             }
 
             assert_eq!(v, [3i32, 2, 1]);
@@ -1092,8 +1135,8 @@ mod test {
             let mut rows = query.query(&[3i32]).unwrap();
             let mut v = Vec::<i32>::new();
 
-            while let Some(row) = rows.next() {
+            while let Some(row) = rows.next().unwrap() {
-                v.push(row.unwrap().get(0));
+                v.push(row.get(0).unwrap());
             }
 
             assert_eq!(v, [2i32, 1]);
@@ -1114,8 +1157,9 @@ mod test {
 
         let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
         let results: Result<Vec<String>> = query
-            .query_map(NO_PARAMS, |row| row.get(1))
+            .query(NO_PARAMS)
             .unwrap()
+            .map(|row| row.get(1))
             .collect();
 
         assert_eq!(results.unwrap().concat(), "hello, world!");
@@ -1146,7 +1190,7 @@ mod test {
             err => panic!("Unexpected error {}", err),
         }
 
-        let bad_query_result = db.query_row("NOT A PROPER QUERY; test123", NO_PARAMS, |_| ());
+        let bad_query_result = db.query_row("NOT A PROPER QUERY; test123", NO_PARAMS, |_| Ok(()));
 
         assert!(bad_query_result.is_err());
     }
@@ -1235,7 +1279,7 @@ mod test {
         {
             let mut rows = stmt.query(NO_PARAMS).unwrap();
             assert!(!db.is_busy());
-            let row = rows.next();
+            let row = rows.next().unwrap();
             assert!(db.is_busy());
             assert!(row.is_some());
         }
@@ -1304,12 +1348,11 @@ mod test {
             .prepare("SELECT interrupt() FROM (SELECT 1 UNION SELECT 2 UNION SELECT 3)")
             .unwrap();
 
-        let result: Result<Vec<i32>> = stmt.query_map(NO_PARAMS, |r| r.get(0)).unwrap().collect();
+        let result: Result<Vec<i32>> = stmt.query(NO_PARAMS).unwrap().map(|r| r.get(0)).collect();
 
         match result.unwrap_err() {
             Error::SqliteFailure(err, _) => {
                 assert_eq!(err.code, ErrorCode::OperationInterrupted);
-                return;
             }
             err => {
                 panic!("Unexpected error {}", err);
@@ -1347,8 +1390,7 @@ mod test {
         let mut query = db.prepare("SELECT i, x FROM foo").unwrap();
         let mut rows = query.query(NO_PARAMS).unwrap();
 
-        while let Some(res) = rows.next() {
+        while let Some(row) = rows.next().unwrap() {
-            let row = res.unwrap();
             let i = row.get_raw(0).as_i64().unwrap();
             let expect = vals[i as usize];
             let x = row.get_raw("x").as_str().unwrap();
@@ -1421,7 +1463,7 @@ mod test {
 
             let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
             let results: Result<Vec<String>> = query
-                .query_and_then(NO_PARAMS, |row| row.get_checked(1))
+                .query_and_then(NO_PARAMS, |row| row.get(1))
                 .unwrap()
                 .collect();
 
@@ -1442,17 +1484,17 @@ mod test {
 
             let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
             let bad_type: Result<Vec<f64>> = query
-                .query_and_then(NO_PARAMS, |row| row.get_checked(1))
+                .query_and_then(NO_PARAMS, |row| row.get(1))
                 .unwrap()
                 .collect();
 
             match bad_type.unwrap_err() {
-                Error::InvalidColumnType(_, _) => (),
+                Error::InvalidColumnType(_, _, _) => (),
                 err => panic!("Unexpected error {}", err),
             }
 
             let bad_idx: Result<Vec<String>> = query
-                .query_and_then(NO_PARAMS, |row| row.get_checked(3))
+                .query_and_then(NO_PARAMS, |row| row.get(3))
                 .unwrap()
                 .collect();
 
@@ -1476,9 +1518,7 @@ mod test {
 
             let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
             let results: CustomResult<Vec<String>> = query
-                .query_and_then(NO_PARAMS, |row| {
+                .query_and_then(NO_PARAMS, |row| row.get(1).map_err(CustomError::Sqlite))
-                    row.get_checked(1).map_err(CustomError::Sqlite)
-                })
                 .unwrap()
                 .collect();
 
@@ -1499,21 +1539,17 @@ mod test {
 
             let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
             let bad_type: CustomResult<Vec<f64>> = query
-                .query_and_then(NO_PARAMS, |row| {
+                .query_and_then(NO_PARAMS, |row| row.get(1).map_err(CustomError::Sqlite))
-                    row.get_checked(1).map_err(CustomError::Sqlite)
-                })
                 .unwrap()
                 .collect();
 
             match bad_type.unwrap_err() {
-                CustomError::Sqlite(Error::InvalidColumnType(_, _)) => (),
+                CustomError::Sqlite(Error::InvalidColumnType(_, _, _)) => (),
                 err => panic!("Unexpected error {}", err),
             }
 
             let bad_idx: CustomResult<Vec<String>> = query
-                .query_and_then(NO_PARAMS, |row| {
+                .query_and_then(NO_PARAMS, |row| row.get(3).map_err(CustomError::Sqlite))
-                    row.get_checked(3).map_err(CustomError::Sqlite)
-                })
                 .unwrap()
                 .collect();
 
@@ -1544,7 +1580,7 @@ mod test {
 
             let query = "SELECT x, y FROM foo ORDER BY x DESC";
             let results: CustomResult<String> = db.query_row_and_then(query, NO_PARAMS, |row| {
-                row.get_checked(1).map_err(CustomError::Sqlite)
+                row.get(1).map_err(CustomError::Sqlite)
             });
 
             assert_eq!(results.unwrap(), "hello");
@@ -1561,16 +1597,16 @@ mod test {
 
             let query = "SELECT x, y FROM foo ORDER BY x DESC";
             let bad_type: CustomResult<f64> = db.query_row_and_then(query, NO_PARAMS, |row| {
-                row.get_checked(1).map_err(CustomError::Sqlite)
+                row.get(1).map_err(CustomError::Sqlite)
             });
 
             match bad_type.unwrap_err() {
-                CustomError::Sqlite(Error::InvalidColumnType(_, _)) => (),
+                CustomError::Sqlite(Error::InvalidColumnType(_, _, _)) => (),
                 err => panic!("Unexpected error {}", err),
             }
 
             let bad_idx: CustomResult<String> = db.query_row_and_then(query, NO_PARAMS, |row| {
-                row.get_checked(3).map_err(CustomError::Sqlite)
+                row.get(3).map_err(CustomError::Sqlite)
             });
 
             match bad_idx.unwrap_err() {
@@ -1597,7 +1633,20 @@ mod test {
             db.execute_batch(sql).unwrap();
 
             db.query_row("SELECT * FROM foo", params![], |r| {
-                assert_eq!(2, r.column_count())
+                assert_eq!(2, r.column_count());
+                Ok(())
+            })
+            .unwrap();
+        }
+        #[test]
+        fn test_dyn_box() {
+            let db = checked_memory_handle();
+            db.execute_batch("CREATE TABLE foo(x INTEGER);").unwrap();
+            let b: Box<dyn ToSql> = Box::new(5);
+            db.execute("INSERT INTO foo VALUES(?)", &[b]).unwrap();
+            db.query_row("SELECT x FROM foo", params![], |r| {
+                assert_eq!(5, r.get_unwrap::<_, i32>(0));
+                Ok(())
             })
             .unwrap();
         }

src/load_extension_guard.rs

@@ -17,7 +17,7 @@ pub struct LoadExtensionGuard<'conn> {
     conn: &'conn Connection,
 }
 
-impl<'conn> LoadExtensionGuard<'conn> {
+impl LoadExtensionGuard<'_> {
     /// Attempt to enable loading extensions. Loading extensions will be
     /// disabled when this guard goes out of scope. Cannot be meaningfully
     /// nested.
@@ -28,7 +28,7 @@ impl<'conn> LoadExtensionGuard<'conn> {
 }
 
 #[allow(unused_must_use)]
-impl<'conn> Drop for LoadExtensionGuard<'conn> {
+impl Drop for LoadExtensionGuard<'_> {
     fn drop(&mut self) {
         self.conn.load_extension_disable();
     }

src/pragma.rs

@@ -0,0 +1,433 @@
+//! Pragma helpers
+
+use std::ops::Deref;
+
+use crate::error::Error;
+use crate::ffi;
+use crate::types::{ToSql, ToSqlOutput, ValueRef};
+use crate::{Connection, DatabaseName, Result, Row, NO_PARAMS};
+
+pub struct Sql {
+    buf: String,
+}
+
+impl Sql {
+    pub fn new() -> Sql {
+        Sql { buf: String::new() }
+    }
+
+    pub fn push_pragma(
+        &mut self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+    ) -> Result<()> {
+        self.push_keyword("PRAGMA")?;
+        self.push_space();
+        if let Some(schema_name) = schema_name {
+            self.push_schema_name(schema_name);
+            self.push_dot();
+        }
+        self.push_keyword(pragma_name)
+    }
+
+    pub fn push_keyword(&mut self, keyword: &str) -> Result<()> {
+        if !keyword.is_empty() && is_identifier(keyword) {
+            self.buf.push_str(keyword);
+            Ok(())
+        } else {
+            Err(Error::SqliteFailure(
+                ffi::Error::new(ffi::SQLITE_MISUSE),
+                Some(format!("Invalid keyword \"{}\"", keyword)),
+            ))
+        }
+    }
+
+    pub fn push_schema_name(&mut self, schema_name: DatabaseName<'_>) {
+        match schema_name {
+            DatabaseName::Main => self.buf.push_str("main"),
+            DatabaseName::Temp => self.buf.push_str("temp"),
+            DatabaseName::Attached(s) => self.push_identifier(s),
+        };
+    }
+
+    pub fn push_identifier(&mut self, s: &str) {
+        if is_identifier(s) {
+            self.buf.push_str(s);
+        } else {
+            self.wrap_and_escape(s, '"');
+        }
+    }
+
+    pub fn push_value(&mut self, value: &dyn ToSql) -> Result<()> {
+        let value = value.to_sql()?;
+        let value = match value {
+            ToSqlOutput::Borrowed(v) => v,
+            ToSqlOutput::Owned(ref v) => ValueRef::from(v),
+            #[cfg(feature = "blob")]
+            ToSqlOutput::ZeroBlob(_) => {
+                return Err(Error::SqliteFailure(
+                    ffi::Error::new(ffi::SQLITE_MISUSE),
+                    Some(format!("Unsupported value \"{:?}\"", value)),
+                ));
+            }
+            #[cfg(feature = "array")]
+            ToSqlOutput::Array(_) => {
+                return Err(Error::SqliteFailure(
+                    ffi::Error::new(ffi::SQLITE_MISUSE),
+                    Some(format!("Unsupported value \"{:?}\"", value)),
+                ));
+            }
+        };
+        match value {
+            ValueRef::Integer(i) => {
+                self.push_int(i);
+            }
+            ValueRef::Real(r) => {
+                self.push_real(r);
+            }
+            ValueRef::Text(s) => {
+                let s = std::str::from_utf8(s)?;
+                self.push_string_literal(s);
+            }
+            _ => {
+                return Err(Error::SqliteFailure(
+                    ffi::Error::new(ffi::SQLITE_MISUSE),
+                    Some(format!("Unsupported value \"{:?}\"", value)),
+                ));
+            }
+        };
+        Ok(())
+    }
+
+    pub fn push_string_literal(&mut self, s: &str) {
+        self.wrap_and_escape(s, '\'');
+    }
+
+    pub fn push_int(&mut self, i: i64) {
+        self.buf.push_str(&i.to_string());
+    }
+
+    pub fn push_real(&mut self, f: f64) {
+        self.buf.push_str(&f.to_string());
+    }
+
+    pub fn push_space(&mut self) {
+        self.buf.push(' ');
+    }
+
+    pub fn push_dot(&mut self) {
+        self.buf.push('.');
+    }
+
+    pub fn push_equal_sign(&mut self) {
+        self.buf.push('=');
+    }
+
+    pub fn open_brace(&mut self) {
+        self.buf.push('(');
+    }
+
+    pub fn close_brace(&mut self) {
+        self.buf.push(')');
+    }
+
+    pub fn as_str(&self) -> &str {
+        &self.buf
+    }
+
+    fn wrap_and_escape(&mut self, s: &str, quote: char) {
+        self.buf.push(quote);
+        let chars = s.chars();
+        for ch in chars {
+            // escape `quote` by doubling it
+            if ch == quote {
+                self.buf.push(ch);
+            }
+            self.buf.push(ch)
+        }
+        self.buf.push(quote);
+    }
+}
+
+impl Deref for Sql {
+    type Target = str;
+
+    fn deref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl Connection {
+    /// Query the current value of `pragma_name`.
+    ///
+    /// Some pragmas will return multiple rows/values which cannot be retrieved
+    /// with this method.
+    ///
+    /// Prefer [PRAGMA function](https://sqlite.org/pragma.html#pragfunc) introduced in SQLite 3.20:
+    /// `SELECT user_version FROM pragma_user_version;`
+    pub fn pragma_query_value<T, F>(
+        &self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+        f: F,
+    ) -> Result<T>
+    where
+        F: FnOnce(&Row<'_>) -> Result<T>,
+    {
+        let mut query = Sql::new();
+        query.push_pragma(schema_name, pragma_name)?;
+        self.query_row(&query, NO_PARAMS, f)
+    }
+
+    /// Query the current rows/values of `pragma_name`.
+    ///
+    /// Prefer [PRAGMA function](https://sqlite.org/pragma.html#pragfunc) introduced in SQLite 3.20:
+    /// `SELECT * FROM pragma_collation_list;`
+    pub fn pragma_query<F>(
+        &self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+        mut f: F,
+    ) -> Result<()>
+    where
+        F: FnMut(&Row<'_>) -> Result<()>,
+    {
+        let mut query = Sql::new();
+        query.push_pragma(schema_name, pragma_name)?;
+        let mut stmt = self.prepare(&query)?;
+        let mut rows = stmt.query(NO_PARAMS)?;
+        while let Some(result_row) = rows.next()? {
+            let row = result_row;
+            f(&row)?;
+        }
+        Ok(())
+    }
+
+    /// Query the current value(s) of `pragma_name` associated to
+    /// `pragma_value`.
+    ///
+    /// This method can be used with query-only pragmas which need an argument
+    /// (e.g. `table_info('one_tbl')`) or pragmas which returns value(s)
+    /// (e.g. `integrity_check`).
+    ///
+    /// Prefer [PRAGMA function](https://sqlite.org/pragma.html#pragfunc) introduced in SQLite 3.20:
+    /// `SELECT * FROM pragma_table_info(?);`
+    pub fn pragma<F>(
+        &self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+        pragma_value: &dyn ToSql,
+        mut f: F,
+    ) -> Result<()>
+    where
+        F: FnMut(&Row<'_>) -> Result<()>,
+    {
+        let mut sql = Sql::new();
+        sql.push_pragma(schema_name, pragma_name)?;
+        // The argument may be either in parentheses
+        // or it may be separated from the pragma name by an equal sign.
+        // The two syntaxes yield identical results.
+        sql.open_brace();
+        sql.push_value(pragma_value)?;
+        sql.close_brace();
+        let mut stmt = self.prepare(&sql)?;
+        let mut rows = stmt.query(NO_PARAMS)?;
+        while let Some(result_row) = rows.next()? {
+            let row = result_row;
+            f(&row)?;
+        }
+        Ok(())
+    }
+
+    /// Set a new value to `pragma_name`.
+    ///
+    /// Some pragmas will return the updated value which cannot be retrieved
+    /// with this method.
+    pub fn pragma_update(
+        &self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+        pragma_value: &dyn ToSql,
+    ) -> Result<()> {
+        let mut sql = Sql::new();
+        sql.push_pragma(schema_name, pragma_name)?;
+        // The argument may be either in parentheses
+        // or it may be separated from the pragma name by an equal sign.
+        // The two syntaxes yield identical results.
+        sql.push_equal_sign();
+        sql.push_value(pragma_value)?;
+        self.execute_batch(&sql)
+    }
+
+    /// Set a new value to `pragma_name` and return the updated value.
+    ///
+    /// Only few pragmas automatically return the updated value.
+    pub fn pragma_update_and_check<F, T>(
+        &self,
+        schema_name: Option<DatabaseName<'_>>,
+        pragma_name: &str,
+        pragma_value: &dyn ToSql,
+        f: F,
+    ) -> Result<T>
+    where
+        F: FnOnce(&Row<'_>) -> Result<T>,
+    {
+        let mut sql = Sql::new();
+        sql.push_pragma(schema_name, pragma_name)?;
+        // The argument may be either in parentheses
+        // or it may be separated from the pragma name by an equal sign.
+        // The two syntaxes yield identical results.
+        sql.push_equal_sign();
+        sql.push_value(pragma_value)?;
+        self.query_row(&sql, NO_PARAMS, f)
+    }
+}
+
+fn is_identifier(s: &str) -> bool {
+    let chars = s.char_indices();
+    for (i, ch) in chars {
+        if i == 0 {
+            if !is_identifier_start(ch) {
+                return false;
+            }
+        } else if !is_identifier_continue(ch) {
+            return false;
+        }
+    }
+    true
+}
+
+fn is_identifier_start(c: char) -> bool {
+    (c >= 'A' && c <= 'Z') || c == '_' || (c >= 'a' && c <= 'z') || c > '\x7F'
+}
+
+fn is_identifier_continue(c: char) -> bool {
+    c == '$'
+        || (c >= '0' && c <= '9')
+        || (c >= 'A' && c <= 'Z')
+        || c == '_'
+        || (c >= 'a' && c <= 'z')
+        || c > '\x7F'
+}
+
+#[cfg(test)]
+mod test {
+    use super::Sql;
+    use crate::pragma;
+    use crate::{Connection, DatabaseName};
+
+    #[test]
+    fn pragma_query_value() {
+        let db = Connection::open_in_memory().unwrap();
+        let user_version: i32 = db
+            .pragma_query_value(None, "user_version", |row| row.get(0))
+            .unwrap();
+        assert_eq!(0, user_version);
+    }
+
+    #[test]
+    #[cfg(feature = "bundled")]
+    fn pragma_func_query_value() {
+        use crate::NO_PARAMS;
+
+        let db = Connection::open_in_memory().unwrap();
+        let user_version: i32 = db
+            .query_row(
+                "SELECT user_version FROM pragma_user_version",
+                NO_PARAMS,
+                |row| row.get(0),
+            )
+            .unwrap();
+        assert_eq!(0, user_version);
+    }
+
+    #[test]
+    fn pragma_query_no_schema() {
+        let db = Connection::open_in_memory().unwrap();
+        let mut user_version = -1;
+        db.pragma_query(None, "user_version", |row| {
+            user_version = row.get(0)?;
+            Ok(())
+        })
+        .unwrap();
+        assert_eq!(0, user_version);
+    }
+
+    #[test]
+    fn pragma_query_with_schema() {
+        let db = Connection::open_in_memory().unwrap();
+        let mut user_version = -1;
+        db.pragma_query(Some(DatabaseName::Main), "user_version", |row| {
+            user_version = row.get(0)?;
+            Ok(())
+        })
+        .unwrap();
+        assert_eq!(0, user_version);
+    }
+
+    #[test]
+    fn pragma() {
+        let db = Connection::open_in_memory().unwrap();
+        let mut columns = Vec::new();
+        db.pragma(None, "table_info", &"sqlite_master", |row| {
+            let column: String = row.get(1)?;
+            columns.push(column);
+            Ok(())
+        })
+        .unwrap();
+        assert_eq!(5, columns.len());
+    }
+
+    #[test]
+    #[cfg(feature = "bundled")]
+    fn pragma_func() {
+        let db = Connection::open_in_memory().unwrap();
+        let mut table_info = db.prepare("SELECT * FROM pragma_table_info(?)").unwrap();
+        let mut columns = Vec::new();
+        let mut rows = table_info.query(&["sqlite_master"]).unwrap();
+
+        while let Some(row) = rows.next().unwrap() {
+            let row = row;
+            let column: String = row.get(1).unwrap();
+            columns.push(column);
+        }
+        assert_eq!(5, columns.len());
+    }
+
+    #[test]
+    fn pragma_update() {
+        let db = Connection::open_in_memory().unwrap();
+        db.pragma_update(None, "user_version", &1).unwrap();
+    }
+
+    #[test]
+    fn pragma_update_and_check() {
+        let db = Connection::open_in_memory().unwrap();
+        let journal_mode: String = db
+            .pragma_update_and_check(None, "journal_mode", &"OFF", |row| row.get(0))
+            .unwrap();
+        assert_eq!("off", &journal_mode);
+    }
+
+    #[test]
+    fn is_identifier() {
+        assert!(pragma::is_identifier("full"));
+        assert!(pragma::is_identifier("r2d2"));
+        assert!(!pragma::is_identifier("sp ce"));
+        assert!(!pragma::is_identifier("semi;colon"));
+    }
+
+    #[test]
+    fn double_quote() {
+        let mut sql = Sql::new();
+        sql.push_schema_name(DatabaseName::Attached(r#"schema";--"#));
+        assert_eq!(r#""schema"";--""#, sql.as_str());
+    }
+
+    #[test]
+    fn wrap_and_escape() {
+        let mut sql = Sql::new();
+        sql.push_string_literal("value'; --");
+        assert_eq!("'value''; --'", sql.as_str());
+    }
+}

src/raw_statement.rs

@@ -26,8 +26,32 @@ impl RawStatement {
         unsafe { ffi::sqlite3_column_type(self.0, idx as c_int) }
     }
 
-    pub fn column_name(&self, idx: usize) -> &CStr {
+    pub fn column_decltype(&self, idx: usize) -> Option<&CStr> {
-        unsafe { CStr::from_ptr(ffi::sqlite3_column_name(self.0, idx as c_int)) }
+        unsafe {
+            let decltype = ffi::sqlite3_column_decltype(self.0, idx as c_int);
+            if decltype.is_null() {
+                None
+            } else {
+                Some(CStr::from_ptr(decltype))
+            }
+        }
+    }
+
+    pub fn column_name(&self, idx: usize) -> Option<&CStr> {
+        let idx = idx as c_int;
+        if idx < 0 || idx >= self.column_count() as c_int {
+            return None;
+        }
+        unsafe {
+            let ptr = ffi::sqlite3_column_name(self.0, idx);
+            // If ptr is null here, it's an OOM, so there's probably nothing
+            // meaningful we can do. Just assert instead of returning None.
+            assert!(
+                !ptr.is_null(),
+                "Null pointer from sqlite3_column_name: Out of memory?"
+            );
+            Some(CStr::from_ptr(ptr))
+        }
     }
 
     pub fn step(&self) -> c_int {
@@ -90,15 +114,14 @@ impl RawStatement {
         unsafe { ffi::sqlite3_stmt_readonly(self.0) != 0 }
     }
 
+    /// `CStr` must be freed
     #[cfg(feature = "bundled")]
-    pub fn expanded_sql(&self) -> Option<&CStr> {
+    pub unsafe fn expanded_sql(&self) -> Option<&CStr> {
-        unsafe {
+        let ptr = ffi::sqlite3_expanded_sql(self.0);
-            let ptr = ffi::sqlite3_expanded_sql(self.0);
+        if ptr.is_null() {
-            if ptr.is_null() {
+            None
-                None
+        } else {
-            } else {
+            Some(CStr::from_ptr(ptr))
-                Some(CStr::from_ptr(ptr))
-            }
         }
     }
 

src/row.rs

@@ -1,4 +1,5 @@
-use std::marker::PhantomData;
+use fallible_iterator::FallibleIterator;
+use fallible_streaming_iterator::FallibleStreamingIterator;
 use std::{convert, result};
 
 use super::{Error, Result, Statement};
@@ -6,7 +7,8 @@ use crate::types::{FromSql, FromSqlError, ValueRef};
 
 /// An handle for the resulting rows of a query.
 pub struct Rows<'stmt> {
-    stmt: Option<&'stmt Statement<'stmt>>,
+    pub(crate) stmt: Option<&'stmt Statement<'stmt>>,
+    row: Option<Row<'stmt>>,
 }
 
 impl<'stmt> Rows<'stmt> {
@@ -16,55 +18,73 @@ impl<'stmt> Rows<'stmt> {
         }
     }
 
-    /// Attempt to get the next row from the query. Returns `Some(Ok(Row))` if
+    /// Attempt to get the next row from the query. Returns `Ok(Some(Row))` if
-    /// there is another row, `Some(Err(...))` if there was an error
+    /// there is another row, `Err(...)` if there was an error
-    /// getting the next row, and `None` if all rows have been retrieved.
+    /// getting the next row, and `Ok(None)` if all rows have been retrieved.
     ///
     /// ## Note
     ///
     /// This interface is not compatible with Rust's `Iterator` trait, because
     /// the lifetime of the returned row is tied to the lifetime of `self`.
-    /// This is a "streaming iterator". For a more natural interface,
+    /// This is a fallible "streaming iterator". For a more natural interface,
     /// consider using `query_map` or `query_and_then` instead, which
     /// return types that implement `Iterator`.
     #[allow(clippy::should_implement_trait)] // cannot implement Iterator
-    pub fn next<'a>(&'a mut self) -> Option<Result<Row<'a, 'stmt>>> {
+    pub fn next(&mut self) -> Result<Option<&Row<'stmt>>> {
-        self.stmt.and_then(|stmt| match stmt.step() {
+        self.advance()?;
-            Ok(true) => Some(Ok(Row {
+        Ok((*self).get())
-                stmt,
+    }
-                phantom: PhantomData,
+
-            })),
+    pub fn map<F, B>(self, f: F) -> Map<'stmt, F>
-            Ok(false) => {
+    where
-                self.reset();
+        F: FnMut(&Row<'_>) -> Result<B>,
-                None
+    {
-            }
+        Map { rows: self, f }
-            Err(err) => {
-                self.reset();
-                Some(Err(err))
-            }
-        })
     }
 }
 
 impl<'stmt> Rows<'stmt> {
     pub(crate) fn new(stmt: &'stmt Statement<'stmt>) -> Rows<'stmt> {
-        Rows { stmt: Some(stmt) }
+        Rows {
+            stmt: Some(stmt),
+            row: None,
+        }
     }
 
-    pub(crate) fn get_expected_row<'a>(&'a mut self) -> Result<Row<'a, 'stmt>> {
+    pub(crate) fn get_expected_row(&mut self) -> Result<&Row<'stmt>> {
-        match self.next() {
+        match self.next()? {
-            Some(row) => row,
+            Some(row) => Ok(row),
             None => Err(Error::QueryReturnedNoRows),
         }
     }
 }
 
-impl<'stmt> Drop for Rows<'stmt> {
+impl Drop for Rows<'_> {
     fn drop(&mut self) {
         self.reset();
     }
 }
 
+pub struct Map<'stmt, F> {
+    rows: Rows<'stmt>,
+    f: F,
+}
+
+impl<F, B> FallibleIterator for Map<'_, F>
+where
+    F: FnMut(&Row<'_>) -> Result<B>,
+{
+    type Error = Error;
+    type Item = B;
+
+    fn next(&mut self) -> Result<Option<B>> {
+        match self.rows.next()? {
+            Some(v) => Ok(Some((self.f)(v)?)),
+            None => Ok(None),
+        }
+    }
+}
+
 /// An iterator over the mapped resulting rows of a query.
 pub struct MappedRows<'stmt, F> {
     rows: Rows<'stmt>,
@@ -73,16 +93,16 @@ pub struct MappedRows<'stmt, F> {
 
 impl<'stmt, T, F> MappedRows<'stmt, F>
 where
-    F: FnMut(&Row<'_, '_>) -> T,
+    F: FnMut(&Row<'_>) -> Result<T>,
 {
     pub(crate) fn new(rows: Rows<'stmt>, f: F) -> MappedRows<'stmt, F> {
         MappedRows { rows, map: f }
     }
 }
 
-impl<'conn, T, F> Iterator for MappedRows<'conn, F>
+impl<T, F> Iterator for MappedRows<'_, F>
 where
-    F: FnMut(&Row<'_, '_>) -> T,
+    F: FnMut(&Row<'_>) -> Result<T>,
 {
     type Item = Result<T>;
 
@@ -90,7 +110,8 @@ where
         let map = &mut self.map;
         self.rows
             .next()
-            .map(|row_result| row_result.map(|row| (map)(&row)))
+            .transpose()
+            .map(|row_result| row_result.and_then(|row| (map)(&row)))
     }
 }
 
@@ -103,17 +124,17 @@ pub struct AndThenRows<'stmt, F> {
 
 impl<'stmt, T, E, F> AndThenRows<'stmt, F>
 where
-    F: FnMut(&Row<'_, '_>) -> result::Result<T, E>,
+    F: FnMut(&Row<'_>) -> result::Result<T, E>,
 {
     pub(crate) fn new(rows: Rows<'stmt>, f: F) -> AndThenRows<'stmt, F> {
         AndThenRows { rows, map: f }
     }
 }
 
-impl<'stmt, T, E, F> Iterator for AndThenRows<'stmt, F>
+impl<T, E, F> Iterator for AndThenRows<'_, F>
 where
     E: convert::From<Error>,
-    F: FnMut(&Row<'_, '_>) -> result::Result<T, E>,
+    F: FnMut(&Row<'_>) -> result::Result<T, E>,
 {
     type Item = result::Result<T, E>;
 
@@ -121,31 +142,65 @@ where
         let map = &mut self.map;
         self.rows
             .next()
+            .transpose()
             .map(|row_result| row_result.map_err(E::from).and_then(|row| (map)(&row)))
     }
 }
 
-/// A single result row of a query.
+impl<'stmt> FallibleStreamingIterator for Rows<'stmt> {
-pub struct Row<'a, 'stmt: 'a> {
+    type Error = Error;
-    stmt: &'stmt Statement<'stmt>,
+    type Item = Row<'stmt>;
-    phantom: PhantomData<&'a ()>,
+
+    fn advance(&mut self) -> Result<()> {
+        match self.stmt {
+            Some(ref stmt) => match stmt.step() {
+                Ok(true) => {
+                    self.row = Some(Row { stmt });
+                    Ok(())
+                }
+                Ok(false) => {
+                    self.reset();
+                    self.row = None;
+                    Ok(())
+                }
+                Err(e) => {
+                    self.reset();
+                    self.row = None;
+                    Err(e)
+                }
+            },
+            None => {
+                self.row = None;
+                Ok(())
+            }
+        }
+    }
+
+    fn get(&self) -> Option<&Row<'stmt>> {
+        self.row.as_ref()
+    }
 }
 
-impl<'a, 'stmt> Row<'a, 'stmt> {
+/// A single result row of a query.
+pub struct Row<'stmt> {
+    pub(crate) stmt: &'stmt Statement<'stmt>,
+}
+
+impl<'stmt> Row<'stmt> {
     /// Get the value of a particular column of the result row.
     ///
     /// ## Failure
     ///
-    /// Panics if calling `row.get_checked(idx)` would return an error,
+    /// Panics if calling `row.get(idx)` would return an error,
     /// including:
     ///
-    ///    * If the underlying SQLite column type is not a valid type as a
+    /// * If the underlying SQLite column type is not a valid type as a source
-    ///      source for `T`
+    ///   for `T`
-    ///    * If the underlying SQLite integral value is outside the range
+    /// * If the underlying SQLite integral value is outside the range
-    ///      representable by `T`
+    ///   representable by `T`
-    ///    * If `idx` is outside the range of columns in the returned query
+    /// * If `idx` is outside the range of columns in the returned query
-    pub fn get<I: RowIndex, T: FromSql>(&self, idx: I) -> T {
+    pub fn get_unwrap<I: RowIndex, T: FromSql>(&self, idx: I) -> T {
-        self.get_checked(idx).unwrap()
+        self.get(idx).unwrap()
     }
 
     /// Get the value of a particular column of the result row.
@@ -164,17 +219,25 @@ impl<'a, 'stmt> Row<'a, 'stmt> {
     /// If the result type is i128 (which requires the `i128_blob` feature to be
     /// enabled), and the underlying SQLite column is a blob whose size is not
     /// 16 bytes, `Error::InvalidColumnType` will also be returned.
-    pub fn get_checked<I: RowIndex, T: FromSql>(&self, idx: I) -> Result<T> {
+    pub fn get<I: RowIndex, T: FromSql>(&self, idx: I) -> Result<T> {
         let idx = idx.idx(self.stmt)?;
         let value = self.stmt.value_ref(idx);
         FromSql::column_result(value).map_err(|err| match err {
-            FromSqlError::InvalidType => Error::InvalidColumnType(idx, value.data_type()),
+            FromSqlError::InvalidType => {
+                Error::InvalidColumnType(idx, self.stmt.column_name(idx).into(), value.data_type())
+            }
             FromSqlError::OutOfRange(i) => Error::IntegralValueOutOfRange(idx, i),
             FromSqlError::Other(err) => {
                 Error::FromSqlConversionFailure(idx as usize, value.data_type(), err)
             }
             #[cfg(feature = "i128_blob")]
-            FromSqlError::InvalidI128Size(_) => Error::InvalidColumnType(idx, value.data_type()),
+            FromSqlError::InvalidI128Size(_) => {
+                Error::InvalidColumnType(idx, self.stmt.column_name(idx).into(), value.data_type())
+            }
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(_) => {
+                Error::InvalidColumnType(idx, self.stmt.column_name(idx).into(), value.data_type())
+            }
         })
     }
 
@@ -184,7 +247,7 @@ impl<'a, 'stmt> Row<'a, 'stmt> {
     /// This `ValueRef` is valid only as long as this Row, which is enforced by
     /// it's lifetime. This means that while this method is completely safe,
     /// it can be somewhat difficult to use, and most callers will be better
-    /// served by `get` or `get_checked`.
+    /// served by `get` or `get`.
     ///
     /// ## Failure
     ///
@@ -193,7 +256,7 @@ impl<'a, 'stmt> Row<'a, 'stmt> {
     ///
     /// Returns an `Error::InvalidColumnName` if `idx` is not a valid column
     /// name for this row.
-    pub fn get_raw_checked<I: RowIndex>(&self, idx: I) -> Result<ValueRef<'a>> {
+    pub fn get_raw_checked<I: RowIndex>(&self, idx: I) -> Result<ValueRef<'_>> {
         let idx = idx.idx(self.stmt)?;
         // Narrowing from `ValueRef<'stmt>` (which `self.stmt.value_ref(idx)`
         // returns) to `ValueRef<'a>` is needed because it's only valid until
@@ -208,23 +271,18 @@ impl<'a, 'stmt> Row<'a, 'stmt> {
     /// This `ValueRef` is valid only as long as this Row, which is enforced by
     /// it's lifetime. This means that while this method is completely safe,
     /// it can be difficult to use, and most callers will be better served by
-    /// `get` or `get_checked`.
+    /// `get` or `get`.
     ///
     /// ## Failure
     ///
     /// Panics if calling `row.get_raw_checked(idx)` would return an error,
     /// including:
     ///
-    ///    * If `idx` is outside the range of columns in the returned query.
+    /// * If `idx` is outside the range of columns in the returned query.
-    ///    * If `idx` is not a valid column name for this row.
+    /// * If `idx` is not a valid column name for this row.
-    pub fn get_raw<I: RowIndex>(&self, idx: I) -> ValueRef<'a> {
+    pub fn get_raw<I: RowIndex>(&self, idx: I) -> ValueRef<'_> {
         self.get_raw_checked(idx).unwrap()
     }
-
-    /// Return the number of columns in the current row.
-    pub fn column_count(&self) -> usize {
-        self.stmt.column_count()
-    }
 }
 
 /// A trait implemented by types that can index into columns of a row.
@@ -245,7 +303,7 @@ impl RowIndex for usize {
     }
 }
 
-impl<'a> RowIndex for &'a str {
+impl RowIndex for &'_ str {
     #[inline]
     fn idx(&self, stmt: &Statement<'_>) -> Result<usize> {
         stmt.column_index(*self)

src/session.rs

@@ -4,7 +4,7 @@
 use std::ffi::CStr;
 use std::io::{Read, Write};
 use std::marker::PhantomData;
-use std::mem;
+use std::mem::MaybeUninit;
 use std::os::raw::{c_char, c_int, c_uchar, c_void};
 use std::panic::{catch_unwind, RefUnwindSafe};
 use std::ptr;
@@ -28,20 +28,24 @@ pub struct Session<'conn> {
     filter: Option<Box<dyn Fn(&str) -> bool>>,
 }
 
-impl<'conn> Session<'conn> {
+impl Session<'_> {
     /// Create a new session object
-    pub fn new(db: &'conn Connection) -> Result<Session<'conn>> {
+    pub fn new<'conn>(db: &'conn Connection) -> Result<Session<'conn>> {
         Session::new_with_name(db, DatabaseName::Main)
     }
 
     /// Create a new session object
-    pub fn new_with_name(db: &'conn Connection, name: DatabaseName<'_>) -> Result<Session<'conn>> {
+    pub fn new_with_name<'conn>(
+        db: &'conn Connection,
+        name: DatabaseName<'_>,
+    ) -> Result<Session<'conn>> {
         let name = name.to_cstring()?;
 
         let db = db.db.borrow_mut().db;
 
-        let mut s: *mut ffi::sqlite3_session = unsafe { mem::uninitialized() };
+        let mut s = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3session_create(db, name.as_ptr(), &mut s) });
+        check!(unsafe { ffi::sqlite3session_create(db, name.as_ptr(), s.as_mut_ptr()) });
+        let s: *mut ffi::sqlite3_session = unsafe { s.assume_init() };
 
         Ok(Session {
             phantom: PhantomData,
@@ -62,7 +66,6 @@ impl<'conn> Session<'conn> {
         where
             F: Fn(&str) -> bool + RefUnwindSafe,
         {
-            use std::ffi::CStr;
             use std::str;
 
             let boxed_filter: *mut F = p_arg as *mut F;
@@ -110,8 +113,9 @@ impl<'conn> Session<'conn> {
     /// Generate a Changeset
     pub fn changeset(&mut self) -> Result<Changeset> {
         let mut n = 0;
-        let mut cs: *mut c_void = unsafe { mem::uninitialized() };
+        let mut cs = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3session_changeset(self.s, &mut n, &mut cs) });
+        check!(unsafe { ffi::sqlite3session_changeset(self.s, &mut n, cs.as_mut_ptr()) });
+        let cs: *mut c_void = unsafe { cs.assume_init() };
         Ok(Changeset { cs, n })
     }
 
@@ -131,8 +135,9 @@ impl<'conn> Session<'conn> {
     /// Generate a Patchset
     pub fn patchset(&mut self) -> Result<Changeset> {
         let mut n = 0;
-        let mut ps: *mut c_void = unsafe { mem::uninitialized() };
+        let mut ps = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3session_patchset(self.s, &mut n, &mut ps) });
+        check!(unsafe { ffi::sqlite3session_patchset(self.s, &mut n, ps.as_mut_ptr()) });
+        let ps: *mut c_void = unsafe { ps.assume_init() };
         // TODO Validate: same struct
         Ok(Changeset { cs: ps, n })
     }
@@ -155,9 +160,10 @@ impl<'conn> Session<'conn> {
         let from = from.to_cstring()?;
         let table = str_to_cstring(table)?.as_ptr();
         unsafe {
-            let mut errmsg: *mut c_char = mem::uninitialized();
+            let mut errmsg = MaybeUninit::uninit();
-            let r = ffi::sqlite3session_diff(self.s, from.as_ptr(), table, &mut errmsg);
+            let r = ffi::sqlite3session_diff(self.s, from.as_ptr(), table, errmsg.as_mut_ptr());
             if r != ffi::SQLITE_OK {
+                let errmsg: *mut c_char = errmsg.assume_init();
                 let message = errmsg_to_string(&*errmsg);
                 ffi::sqlite3_free(errmsg as *mut ::std::os::raw::c_void);
                 return Err(error_from_sqlite_code(r, Some(message)));
@@ -196,7 +202,7 @@ impl<'conn> Session<'conn> {
     }
 }
 
-impl<'conn> Drop for Session<'conn> {
+impl Drop for Session<'_> {
     fn drop(&mut self) {
         if self.filter.is_some() {
             self.table_filter(None::<fn(&str) -> bool>);
@@ -252,15 +258,17 @@ impl Changeset {
     /// Invert a changeset
     pub fn invert(&self) -> Result<Changeset> {
         let mut n = 0;
-        let mut cs: *mut c_void = unsafe { mem::uninitialized() };
+        let mut cs = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3changeset_invert(self.n, self.cs, &mut n, &mut cs) });
+        check!(unsafe { ffi::sqlite3changeset_invert(self.n, self.cs, &mut n, cs.as_mut_ptr()) });
+        let cs: *mut c_void = unsafe { cs.assume_init() };
         Ok(Changeset { cs, n })
     }
 
     /// Create an iterator to traverse a changeset
     pub fn iter(&self) -> Result<ChangesetIter<'_>> {
-        let mut it: *mut ffi::sqlite3_changeset_iter = unsafe { mem::uninitialized() };
+        let mut it = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3changeset_start(&mut it, self.n, self.cs) });
+        check!(unsafe { ffi::sqlite3changeset_start(it.as_mut_ptr(), self.n, self.cs) });
+        let it: *mut ffi::sqlite3_changeset_iter = unsafe { it.assume_init() };
         Ok(ChangesetIter {
             phantom: PhantomData,
             it,
@@ -271,8 +279,11 @@ impl Changeset {
     /// Concatenate two changeset objects
     pub fn concat(a: &Changeset, b: &Changeset) -> Result<Changeset> {
         let mut n = 0;
-        let mut cs: *mut c_void = unsafe { mem::uninitialized() };
+        let mut cs = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3changeset_concat(a.n, a.cs, b.n, b.cs, &mut n, &mut cs) });
+        check!(unsafe {
+            ffi::sqlite3changeset_concat(a.n, a.cs, b.n, b.cs, &mut n, cs.as_mut_ptr())
+        });
+        let cs: *mut c_void = unsafe { cs.assume_init() };
         Ok(Changeset { cs, n })
     }
 }
@@ -292,18 +303,19 @@ pub struct ChangesetIter<'changeset> {
     item: Option<ChangesetItem>,
 }
 
-impl<'changeset> ChangesetIter<'changeset> {
+impl ChangesetIter<'_> {
     /// Create an iterator on `input`
     pub fn start_strm<'input>(input: &'input mut dyn Read) -> Result<ChangesetIter<'input>> {
         let input_ref = &input;
-        let mut it: *mut ffi::sqlite3_changeset_iter = unsafe { mem::uninitialized() };
+        let mut it = MaybeUninit::uninit();
         check!(unsafe {
             ffi::sqlite3changeset_start_strm(
-                &mut it,
+                it.as_mut_ptr(),
                 Some(x_input),
                 input_ref as *const &mut dyn Read as *mut c_void,
             )
         });
+        let it: *mut ffi::sqlite3_changeset_iter = unsafe { it.assume_init() };
         Ok(ChangesetIter {
             phantom: PhantomData,
             it,
@@ -312,7 +324,7 @@ impl<'changeset> ChangesetIter<'changeset> {
     }
 }
 
-impl<'changeset> FallibleStreamingIterator for ChangesetIter<'changeset> {
+impl FallibleStreamingIterator for ChangesetIter<'_> {
     type Error = crate::error::Error;
     type Item = ChangesetItem;
 
@@ -343,7 +355,7 @@ pub struct Operation<'item> {
     indirect: bool,
 }
 
-impl<'item> Operation<'item> {
+impl Operation<'_> {
     pub fn table_name(&self) -> &str {
         self.table_name
     }
@@ -361,7 +373,7 @@ impl<'item> Operation<'item> {
     }
 }
 
-impl<'changeset> Drop for ChangesetIter<'changeset> {
+impl Drop for ChangesetIter<'_> {
     fn drop(&mut self) {
         unsafe {
             ffi::sqlite3changeset_finalize(self.it);
@@ -383,12 +395,13 @@ impl ChangesetItem {
     /// `SQLITE_CHANGESET_CONFLICT` conflict handler callback.
     pub fn conflict(&self, col: usize) -> Result<ValueRef<'_>> {
         unsafe {
-            let mut p_value: *mut ffi::sqlite3_value = mem::uninitialized();
+            let mut p_value = MaybeUninit::uninit();
             check!(ffi::sqlite3changeset_conflict(
                 self.it,
                 col as i32,
-                &mut p_value
+                p_value.as_mut_ptr()
             ));
+            let p_value: *mut ffi::sqlite3_value = p_value.assume_init();
             Ok(ValueRef::from_value(p_value))
         }
     }
@@ -411,8 +424,13 @@ impl ChangesetItem {
     /// `SQLITE_INSERT`.
     pub fn new_value(&self, col: usize) -> Result<ValueRef<'_>> {
         unsafe {
-            let mut p_value: *mut ffi::sqlite3_value = mem::uninitialized();
+            let mut p_value = MaybeUninit::uninit();
-            check!(ffi::sqlite3changeset_new(self.it, col as i32, &mut p_value));
+            check!(ffi::sqlite3changeset_new(
+                self.it,
+                col as i32,
+                p_value.as_mut_ptr()
+            ));
+            let p_value: *mut ffi::sqlite3_value = p_value.assume_init();
             Ok(ValueRef::from_value(p_value))
         }
     }
@@ -423,8 +441,13 @@ impl ChangesetItem {
     /// `SQLITE_UPDATE`.
     pub fn old_value(&self, col: usize) -> Result<ValueRef<'_>> {
         unsafe {
-            let mut p_value: *mut ffi::sqlite3_value = mem::uninitialized();
+            let mut p_value = MaybeUninit::uninit();
-            check!(ffi::sqlite3changeset_old(self.it, col as i32, &mut p_value));
+            check!(ffi::sqlite3changeset_old(
+                self.it,
+                col as i32,
+                p_value.as_mut_ptr()
+            ));
+            let p_value: *mut ffi::sqlite3_value = p_value.assume_init();
             Ok(ValueRef::from_value(p_value))
         }
     }
@@ -435,14 +458,15 @@ impl ChangesetItem {
         let mut code = 0;
         let mut indirect = 0;
         let tab = unsafe {
-            let mut pz_tab: *const c_char = mem::uninitialized();
+            let mut pz_tab = MaybeUninit::uninit();
             check!(ffi::sqlite3changeset_op(
                 self.it,
-                &mut pz_tab,
+                pz_tab.as_mut_ptr(),
                 &mut number_of_columns,
                 &mut code,
                 &mut indirect
             ));
+            let pz_tab: *const c_char = pz_tab.assume_init();
             CStr::from_ptr(pz_tab)
         };
         let table_name = tab.to_str()?;
@@ -458,12 +482,13 @@ impl ChangesetItem {
     pub fn pk(&self) -> Result<&[u8]> {
         let mut number_of_columns = 0;
         unsafe {
-            let mut pks: *mut c_uchar = mem::uninitialized();
+            let mut pks = MaybeUninit::uninit();
             check!(ffi::sqlite3changeset_pk(
                 self.it,
-                &mut pks,
+                pks.as_mut_ptr(),
                 &mut number_of_columns
             ));
+            let pks: *mut c_uchar = pks.assume_init();
             Ok(from_raw_parts(pks, number_of_columns as usize))
         }
     }
@@ -477,8 +502,9 @@ pub struct Changegroup {
 
 impl Changegroup {
     pub fn new() -> Result<Self> {
-        let mut cg: *mut ffi::sqlite3_changegroup = unsafe { mem::uninitialized() };
+        let mut cg = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3changegroup_new(&mut cg) });
+        check!(unsafe { ffi::sqlite3changegroup_new(cg.as_mut_ptr()) });
+        let cg: *mut ffi::sqlite3_changegroup = unsafe { cg.assume_init() };
         Ok(Changegroup { cg })
     }
 
@@ -504,8 +530,9 @@ impl Changegroup {
     /// Obtain a composite Changeset
     pub fn output(&mut self) -> Result<Changeset> {
         let mut n = 0;
-        let mut output: *mut c_void = unsafe { mem::uninitialized() };
+        let mut output = MaybeUninit::uninit();
-        check!(unsafe { ffi::sqlite3changegroup_output(self.cg, &mut n, &mut output) });
+        check!(unsafe { ffi::sqlite3changegroup_output(self.cg, &mut n, output.as_mut_ptr()) });
+        let output: *mut c_void = unsafe { output.assume_init() };
         Ok(Changeset { cs: output, n })
     }
 
@@ -645,7 +672,6 @@ where
     F: Fn(&str) -> bool + Send + RefUnwindSafe + 'static,
     C: Fn(ConflictType, ChangesetItem) -> ConflictAction + Send + RefUnwindSafe + 'static,
 {
-    use std::ffi::CStr;
     use std::str;
 
     let tuple: *mut (Option<F>, C) = p_ctx as *mut (Option<F>, C);
@@ -796,7 +822,7 @@ mod test {
         db.execute_batch("CREATE TABLE foo(t TEXT PRIMARY KEY NOT NULL);")
             .unwrap();
 
-        lazy_static! {
+        lazy_static::lazy_static! {
             static ref CALLED: AtomicBool = AtomicBool::new(false);
         }
         db.apply(

src/statement.rs

@@ -7,7 +7,7 @@ use std::slice::from_raw_parts;
 use std::{convert, fmt, mem, ptr, result, str};
 
 use super::ffi;
-use super::str_to_cstring;
+use super::{len_as_c_int, str_for_sqlite, str_to_cstring};
 use super::{
     AndThenRows, Connection, Error, MappedRows, RawStatement, Result, Row, Rows, ValueRef,
 };
@@ -18,48 +18,10 @@ use crate::vtab::array::{free_array, ARRAY_TYPE};
 /// A prepared statement.
 pub struct Statement<'conn> {
     conn: &'conn Connection,
-    stmt: RawStatement,
+    pub(crate) stmt: RawStatement,
 }
 
-impl<'conn> Statement<'conn> {
+impl Statement<'_> {
-    /// Get all the column names in the result set of the prepared statement.
-    pub fn column_names(&self) -> Vec<&str> {
-        let n = self.column_count();
-        let mut cols = Vec::with_capacity(n as usize);
-        for i in 0..n {
-            let slice = self.stmt.column_name(i);
-            let s = str::from_utf8(slice.to_bytes()).unwrap();
-            cols.push(s);
-        }
-        cols
-    }
-
-    /// Return the number of columns in the result set returned by the prepared
-    /// statement.
-    pub fn column_count(&self) -> usize {
-        self.stmt.column_count()
-    }
-
-    /// Returns the column index in the result set for a given column name.
-    ///
-    /// If there is no AS clause then the name of the column is unspecified and
-    /// may change from one release of SQLite to the next.
-    ///
-    /// # Failure
-    ///
-    /// Will return an `Error::InvalidColumnName` when there is no column with
-    /// the specified `name`.
-    pub fn column_index(&self, name: &str) -> Result<usize> {
-        let bytes = name.as_bytes();
-        let n = self.column_count();
-        for i in 0..n {
-            if bytes.eq_ignore_ascii_case(self.stmt.column_name(i).to_bytes()) {
-                return Ok(i);
-            }
-        }
-        Err(Error::InvalidColumnName(String::from(name)))
-    }
-
     /// Execute the prepared statement.
     ///
     /// On success, returns the number of rows that were changed or inserted or
@@ -174,9 +136,8 @@ impl<'conn> Statement<'conn> {
     ///     let mut rows = stmt.query(NO_PARAMS)?;
     ///
     ///     let mut names = Vec::new();
-    ///     while let Some(result_row) = rows.next() {
+    ///     while let Some(row) = rows.next()? {
-    ///         let row = result_row?;
+    ///         names.push(row.get(0)?);
-    ///         names.push(row.get(0));
     ///     }
     ///
     ///     Ok(names)
@@ -209,7 +170,7 @@ impl<'conn> Statement<'conn> {
     /// fn query(conn: &Connection) -> Result<()> {
     ///     let mut stmt = conn.prepare("SELECT * FROM test where name = :name")?;
     ///     let mut rows = stmt.query_named(&[(":name", &"one")])?;
-    ///     while let Some(row) = rows.next() {
+    ///     while let Some(row) = rows.next()? {
     ///         // ...
     ///     }
     ///     Ok(())
@@ -224,7 +185,7 @@ impl<'conn> Statement<'conn> {
     /// fn query(conn: &Connection) -> Result<()> {
     ///     let mut stmt = conn.prepare("SELECT * FROM test where name = :name")?;
     ///     let mut rows = stmt.query_named(named_params!{ ":name": "one" })?;
-    ///     while let Some(row) = rows.next() {
+    ///     while let Some(row) = rows.next()? {
     ///         // ...
     ///     }
     ///     Ok(())
@@ -234,7 +195,7 @@ impl<'conn> Statement<'conn> {
     /// # Failure
     ///
     /// Will return `Err` if binding parameters fails.
-    pub fn query_named<'a>(&'a mut self, params: &[(&str, &dyn ToSql)]) -> Result<Rows<'a>> {
+    pub fn query_named(&mut self, params: &[(&str, &dyn ToSql)]) -> Result<Rows<'_>> {
         self.check_readonly()?;
         self.bind_parameters_named(params)?;
         Ok(Rows::new(self))
@@ -267,7 +228,7 @@ impl<'conn> Statement<'conn> {
     where
         P: IntoIterator,
         P::Item: ToSql,
-        F: FnMut(&Row<'_, '_>) -> T,
+        F: FnMut(&Row<'_>) -> Result<T>,
     {
         let rows = self.query(params)?;
         Ok(MappedRows::new(rows, f))
@@ -300,13 +261,13 @@ impl<'conn> Statement<'conn> {
     /// ## Failure
     ///
     /// Will return `Err` if binding parameters fails.
-    pub fn query_map_named<'a, T, F>(
+    pub fn query_map_named<T, F>(
-        &'a mut self,
+        &mut self,
         params: &[(&str, &dyn ToSql)],
         f: F,
-    ) -> Result<MappedRows<'a, F>>
+    ) -> Result<MappedRows<'_, F>>
     where
-        F: FnMut(&Row<'_, '_>) -> T,
+        F: FnMut(&Row<'_>) -> Result<T>,
     {
         let rows = self.query_named(params)?;
         Ok(MappedRows::new(rows, f))
@@ -324,7 +285,7 @@ impl<'conn> Statement<'conn> {
         P: IntoIterator,
         P::Item: ToSql,
         E: convert::From<Error>,
-        F: FnMut(&Row<'_, '_>) -> result::Result<T, E>,
+        F: FnMut(&Row<'_>) -> result::Result<T, E>,
     {
         let rows = self.query(params)?;
         Ok(AndThenRows::new(rows, f))
@@ -354,7 +315,7 @@ impl<'conn> Statement<'conn> {
     /// fn get_names(conn: &Connection) -> Result<Vec<Person>> {
     ///     let mut stmt = conn.prepare("SELECT name FROM people WHERE id = :id")?;
     ///     let rows =
-    ///         stmt.query_and_then_named(&[(":id", &"one")], |row| name_to_person(row.get(0)))?;
+    ///         stmt.query_and_then_named(&[(":id", &"one")], |row| name_to_person(row.get(0)?))?;
     ///
     ///     let mut persons = Vec::new();
     ///     for person_result in rows {
@@ -368,14 +329,14 @@ impl<'conn> Statement<'conn> {
     /// ## Failure
     ///
     /// Will return `Err` if binding parameters fails.
-    pub fn query_and_then_named<'a, T, E, F>(
+    pub fn query_and_then_named<T, E, F>(
-        &'a mut self,
+        &mut self,
         params: &[(&str, &dyn ToSql)],
         f: F,
-    ) -> Result<AndThenRows<'a, F>>
+    ) -> Result<AndThenRows<'_, F>>
     where
         E: convert::From<Error>,
-        F: FnMut(&Row<'_, '_>) -> result::Result<T, E>,
+        F: FnMut(&Row<'_>) -> result::Result<T, E>,
     {
         let rows = self.query_named(params)?;
         Ok(AndThenRows::new(rows, f))
@@ -389,7 +350,7 @@ impl<'conn> Statement<'conn> {
         P::Item: ToSql,
     {
         let mut rows = self.query(params)?;
-        let exists = rows.next().is_some();
+        let exists = rows.next()?.is_some();
         Ok(exists)
     }
 
@@ -410,11 +371,34 @@ impl<'conn> Statement<'conn> {
     where
         P: IntoIterator,
         P::Item: ToSql,
-        F: FnOnce(&Row<'_, '_>) -> T,
+        F: FnOnce(&Row<'_>) -> Result<T>,
     {
         let mut rows = self.query(params)?;
 
-        rows.get_expected_row().map(|r| f(&r))
+        rows.get_expected_row().and_then(|r| f(&r))
+    }
+
+    /// Convenience method to execute a query with named parameter(s) that is
+    /// expected to return a single row.
+    ///
+    /// If the query returns more than one row, all rows except the first are
+    /// ignored.
+    ///
+    /// Returns `Err(QueryReturnedNoRows)` if no results are returned. If the
+    /// query truly is optional, you can call `.optional()` on the result of
+    /// this to get a `Result<Option<T>>`.
+    ///
+    /// # Failure
+    ///
+    /// Will return `Err` if `sql` cannot be converted to a C-compatible string
+    /// or if the underlying SQLite call fails.
+    pub fn query_row_named<T, F>(&mut self, params: &[(&str, &dyn ToSql)], f: F) -> Result<T>
+    where
+        F: FnOnce(&Row<'_>) -> Result<T>,
+    {
+        let mut rows = self.query_named(params)?;
+
+        rows.get_expected_row().and_then(|r| f(&r))
     }
 
     /// Consumes the statement.
@@ -506,37 +490,19 @@ impl<'conn> Statement<'conn> {
             ValueRef::Integer(i) => unsafe { ffi::sqlite3_bind_int64(ptr, col as c_int, i) },
             ValueRef::Real(r) => unsafe { ffi::sqlite3_bind_double(ptr, col as c_int, r) },
             ValueRef::Text(s) => unsafe {
-                let length = s.len();
+                let (c_str, len, destructor) = str_for_sqlite(s)?;
-                if length > ::std::i32::MAX as usize {
+                ffi::sqlite3_bind_text(ptr, col as c_int, c_str, len, destructor)
-                    ffi::SQLITE_TOOBIG
-                } else {
-                    let c_str = str_to_cstring(s)?;
-                    let destructor = if length > 0 {
-                        ffi::SQLITE_TRANSIENT()
-                    } else {
-                        ffi::SQLITE_STATIC()
-                    };
-                    ffi::sqlite3_bind_text(
-                        ptr,
-                        col as c_int,
-                        c_str.as_ptr(),
-                        length as c_int,
-                        destructor,
-                    )
-                }
             },
             ValueRef::Blob(b) => unsafe {
-                let length = b.len();
+                let length = len_as_c_int(b.len())?;
-                if length > ::std::i32::MAX as usize {
+                if length == 0 {
-                    ffi::SQLITE_TOOBIG
-                } else if length == 0 {
                     ffi::sqlite3_bind_zeroblob(ptr, col as c_int, 0)
                 } else {
                     ffi::sqlite3_bind_blob(
                         ptr,
                         col as c_int,
                         b.as_ptr() as *const c_void,
-                        length as c_int,
+                        length,
                         ffi::SQLITE_TRANSIENT(),
                     )
                 }
@@ -584,11 +550,16 @@ impl<'conn> Statement<'conn> {
     /// Returns a string containing the SQL text of prepared statement with
     /// bound parameters expanded.
     #[cfg(feature = "bundled")]
-    pub fn expanded_sql(&self) -> Option<&str> {
+    pub fn expanded_sql(&self) -> Option<String> {
         unsafe {
-            self.stmt
+            match self.stmt.expanded_sql() {
-                .expanded_sql()
+                Some(s) => {
-                .map(|s| str::from_utf8_unchecked(s.to_bytes()))
+                    let sql = str::from_utf8_unchecked(s.to_bytes()).to_owned();
+                    ffi::sqlite3_free(s.as_ptr() as *mut _);
+                    Some(sql)
+                }
+                _ => None,
+            }
         }
     }
 
@@ -612,7 +583,7 @@ impl<'conn> Statement<'conn> {
     }
 }
 
-impl<'conn> Into<RawStatement> for Statement<'conn> {
+impl Into<RawStatement> for Statement<'_> {
     fn into(mut self) -> RawStatement {
         let mut stmt = RawStatement::new(ptr::null_mut(), ptr::null());
         mem::swap(&mut stmt, &mut self.stmt);
@@ -620,7 +591,7 @@ impl<'conn> Into<RawStatement> for Statement<'conn> {
     }
 }
 
-impl<'conn> fmt::Debug for Statement<'conn> {
+impl fmt::Debug for Statement<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let sql = str::from_utf8(self.stmt.sql().to_bytes());
         f.debug_struct("Statement")
@@ -631,14 +602,14 @@ impl<'conn> fmt::Debug for Statement<'conn> {
     }
 }
 
-impl<'conn> Drop for Statement<'conn> {
+impl Drop for Statement<'_> {
     #[allow(unused_must_use)]
     fn drop(&mut self) {
         self.finalize_();
     }
 }
 
-impl<'conn> Statement<'conn> {
+impl Statement<'_> {
     pub(crate) fn new(conn: &Connection, stmt: RawStatement) -> Statement<'_> {
         Statement { conn, stmt }
     }
@@ -664,10 +635,7 @@ impl<'conn> Statement<'conn> {
                     CStr::from_ptr(text as *const c_char)
                 };
 
-                // sqlite3_column_text returns UTF8 data, so our unwrap here should be fine.
+                let s = s.to_bytes();
-                let s = s
-                    .to_str()
-                    .expect("sqlite3_column_text returned invalid UTF-8");
                 ValueRef::Text(s)
             }
             ffi::SQLITE_BLOB => {
@@ -781,14 +749,13 @@ mod test {
             .unwrap();
         stmt.execute_named(&[(":name", &"one")]).unwrap();
 
+        let mut stmt = db
+            .prepare("SELECT COUNT(*) FROM test WHERE name = :name")
+            .unwrap();
         assert_eq!(
             1i32,
-            db.query_row_named::<i32, _>(
+            stmt.query_row_named::<i32, _>(&[(":name", &"one")], |r| r.get(0))
-                "SELECT COUNT(*) FROM test WHERE name = :name",
+                .unwrap()
-                &[(":name", &"one")],
-                |r| r.get(0)
-            )
-            .unwrap()
         );
     }
 
@@ -806,8 +773,8 @@ mod test {
             .unwrap();
         let mut rows = stmt.query_named(&[(":name", &"one")]).unwrap();
 
-        let id: i32 = rows.next().unwrap().unwrap().get(0);
+        let id: Result<i32> = rows.next().unwrap().unwrap().get(0);
-        assert_eq!(1, id);
+        assert_eq!(Ok(1), id);
     }
 
     #[test]
@@ -824,8 +791,8 @@ mod test {
             .unwrap();
         let mut rows = stmt
             .query_map_named(&[(":name", &"one")], |row| {
-                let id: i32 = row.get(0);
+                let id: Result<i32> = row.get(0);
-                2 * id
+                id.map(|i| 2 * i)
             })
             .unwrap();
 
@@ -848,7 +815,7 @@ mod test {
             .unwrap();
         let mut rows = stmt
             .query_and_then_named(&[(":name", &"one")], |row| {
-                let id: i32 = row.get(0);
+                let id: i32 = row.get(0)?;
                 if id == 1 {
                     Ok(id)
                 } else {
@@ -1021,7 +988,7 @@ mod test {
         let db = Connection::open_in_memory().unwrap();
         let stmt = db.prepare("SELECT ?").unwrap();
         stmt.bind_parameter(&1, 1).unwrap();
-        assert_eq!(Some("SELECT 1"), stmt.expanded_sql());
+        assert_eq!(Some("SELECT 1".to_owned()), stmt.expanded_sql());
     }
 
     #[test]

src/trace.rs

@@ -122,6 +122,7 @@ impl Connection {
 
 #[cfg(test)]
 mod test {
+    use lazy_static::lazy_static;
     use std::sync::Mutex;
     use std::time::Duration;
 
@@ -140,13 +141,13 @@ mod test {
         let mut db = Connection::open_in_memory().unwrap();
         db.trace(Some(tracer));
         {
-            let _ = db.query_row("SELECT ?", &[1i32], |_| {});
+            let _ = db.query_row("SELECT ?", &[1i32], |_| Ok(()));
-            let _ = db.query_row("SELECT ?", &["hello"], |_| {});
+            let _ = db.query_row("SELECT ?", &["hello"], |_| Ok(()));
         }
         db.trace(None);
         {
-            let _ = db.query_row("SELECT ?", &[2i32], |_| {});
+            let _ = db.query_row("SELECT ?", &[2i32], |_| Ok(()));
-            let _ = db.query_row("SELECT ?", &["goodbye"], |_| {});
+            let _ = db.query_row("SELECT ?", &["goodbye"], |_| Ok(()));
         }
 
         let traced_stmts = TRACED_STMTS.lock().unwrap();

src/transaction.rs

@@ -87,7 +87,7 @@ pub struct Savepoint<'conn> {
     committed: bool,
 }
 
-impl<'conn> Transaction<'conn> {
+impl Transaction<'_> {
     /// Begin a new transaction. Cannot be nested; see `savepoint` for nested
     /// transactions.
     /// Even though we don't mutate the connection, we take a `&mut Connection`
@@ -195,7 +195,7 @@ impl<'conn> Transaction<'conn> {
     }
 }
 
-impl<'conn> Deref for Transaction<'conn> {
+impl Deref for Transaction<'_> {
     type Target = Connection;
 
     fn deref(&self) -> &Connection {
@@ -204,13 +204,13 @@ impl<'conn> Deref for Transaction<'conn> {
 }
 
 #[allow(unused_must_use)]
-impl<'conn> Drop for Transaction<'conn> {
+impl Drop for Transaction<'_> {
     fn drop(&mut self) {
         self.finish_();
     }
 }
 
-impl<'conn> Savepoint<'conn> {
+impl Savepoint<'_> {
     fn with_depth_and_name<T: Into<String>>(
         conn: &Connection,
         depth: u32,
@@ -308,7 +308,7 @@ impl<'conn> Savepoint<'conn> {
     }
 }
 
-impl<'conn> Deref for Savepoint<'conn> {
+impl Deref for Savepoint<'_> {
     type Target = Connection;
 
     fn deref(&self) -> &Connection {
@@ -317,7 +317,7 @@ impl<'conn> Deref for Savepoint<'conn> {
 }
 
 #[allow(unused_must_use)]
-impl<'conn> Drop for Savepoint<'conn> {
+impl Drop for Savepoint<'_> {
     fn drop(&mut self) {
         self.finish_();
     }

src/types/chrono.rs

@@ -1,9 +1,8 @@
 //! Convert most of the [Time Strings](http://sqlite.org/lang_datefunc.html) to chrono types.
-use chrono;
 
 use std::borrow::Cow;
 
-use self::chrono::{DateTime, Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
+use chrono::{DateTime, Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
 
 use crate::types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};
 use crate::Result;
@@ -54,7 +53,7 @@ impl FromSql for NaiveTime {
 }
 
 /// ISO 8601 combined date and time without timezone =>
-/// "YYYY-MM-DD HH:MM:SS.SSS"
+/// "YYYY-MM-DDTHH:MM:SS.SSS"
 impl ToSql for NaiveDateTime {
     fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
         let date_str = self.format("%Y-%m-%dT%H:%M:%S%.f").to_string();
@@ -129,10 +128,8 @@ impl FromSql for DateTime<Local> {
 
 #[cfg(test)]
 mod test {
-    use super::chrono::{
-        DateTime, Duration, Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc,
-    };
     use crate::{Connection, Result, NO_PARAMS};
+    use chrono::{DateTime, Duration, Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
 
     fn checked_memory_handle() -> Connection {
         let db = Connection::open_in_memory().unwrap();

src/types/from_sql.rs

@@ -18,6 +18,11 @@ pub enum FromSqlError {
     #[cfg(feature = "i128_blob")]
     InvalidI128Size(usize),
 
+    /// Error returned when reading a `uuid` from a blob with a size
+    /// other than 16. Only available when the `uuid` feature is enabled.
+    #[cfg(feature = "uuid")]
+    InvalidUuidSize(usize),
+
     /// An error case available for implementors of the `FromSql` trait.
     Other(Box<dyn Error + Send + Sync>),
 }
@@ -29,6 +34,8 @@ impl PartialEq for FromSqlError {
             (FromSqlError::OutOfRange(n1), FromSqlError::OutOfRange(n2)) => n1 == n2,
             #[cfg(feature = "i128_blob")]
             (FromSqlError::InvalidI128Size(s1), FromSqlError::InvalidI128Size(s2)) => s1 == s2,
+            #[cfg(feature = "uuid")]
+            (FromSqlError::InvalidUuidSize(s1), FromSqlError::InvalidUuidSize(s2)) => s1 == s2,
             (_, _) => false,
         }
     }
@@ -43,6 +50,10 @@ impl fmt::Display for FromSqlError {
             FromSqlError::InvalidI128Size(s) => {
                 write!(f, "Cannot read 128bit value out of {} byte blob", s)
             }
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(s) => {
+                write!(f, "Cannot read UUID value out of {} byte blob", s)
+            }
             FromSqlError::Other(ref err) => err.fmt(f),
         }
     }
@@ -55,6 +66,8 @@ impl Error for FromSqlError {
             FromSqlError::OutOfRange(_) => "value out of range",
             #[cfg(feature = "i128_blob")]
             FromSqlError::InvalidI128Size(_) => "unexpected blob size for 128bit value",
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(_) => "unexpected blob size for UUID value",
             FromSqlError::Other(ref err) => err.description(),
         }
     }
@@ -64,9 +77,7 @@ impl Error for FromSqlError {
     fn cause(&self) -> Option<&dyn Error> {
         match *self {
             FromSqlError::Other(ref err) => err.cause(),
-            FromSqlError::InvalidType | FromSqlError::OutOfRange(_) => None,
+            _ => None,
-            #[cfg(feature = "i128_blob")]
-            FromSqlError::InvalidI128Size(_) => None,
         }
     }
 }
@@ -151,7 +162,7 @@ impl FromSql for bool {
 
 impl FromSql for String {
     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
-        value.as_str().map(|s| s.to_string())
+        value.as_str().map(ToString::to_string)
     }
 }
 
@@ -176,6 +187,19 @@ impl FromSql for i128 {
     }
 }
 
+#[cfg(feature = "uuid")]
+impl FromSql for uuid::Uuid {
+    fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
+        value
+            .as_blob()
+            .and_then(|bytes| {
+                uuid::Builder::from_slice(bytes)
+                    .map_err(|_| FromSqlError::InvalidUuidSize(bytes.len()))
+            })
+            .map(|mut builder| builder.build())
+    }
+}
+
 impl<T: FromSql> FromSql for Option<T> {
     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
         match value {
@@ -210,8 +234,7 @@ mod test {
         {
             for n in out_of_range {
                 let err = db
-                    .query_row("SELECT ?", &[n], |r| r.get_checked::<_, T>(0))
+                    .query_row("SELECT ?", &[n], |r| r.get::<_, T>(0))
-                    .unwrap()
                     .unwrap_err();
                 match err {
                     Error::IntegralValueOutOfRange(_, value) => assert_eq!(*n, value),

src/types/mod.rs

@@ -66,6 +66,8 @@ mod from_sql;
 mod serde_json;
 mod time;
 mod to_sql;
+#[cfg(feature = "url")]
+mod url;
 mod value;
 mod value_ref;
 
@@ -207,27 +209,27 @@ mod test {
 
         {
             let row1 = rows.next().unwrap().unwrap();
-            let s1: Option<String> = row1.get(0);
+            let s1: Option<String> = row1.get_unwrap(0);
-            let b1: Option<Vec<u8>> = row1.get(1);
+            let b1: Option<Vec<u8>> = row1.get_unwrap(1);
             assert_eq!(s.unwrap(), s1.unwrap());
             assert!(b1.is_none());
         }
 
         {
             let row2 = rows.next().unwrap().unwrap();
-            let s2: Option<String> = row2.get(0);
+            let s2: Option<String> = row2.get_unwrap(0);
-            let b2: Option<Vec<u8>> = row2.get(1);
+            let b2: Option<Vec<u8>> = row2.get_unwrap(1);
             assert!(s2.is_none());
             assert_eq!(b, b2);
         }
     }
 
     #[test]
-    #[allow(clippy::cyclomatic_complexity)]
+    #[allow(clippy::cognitive_complexity)]
     fn test_mismatched_types() {
         fn is_invalid_column_type(err: Error) -> bool {
             match err {
-                Error::InvalidColumnType(_, _) => true,
+                Error::InvalidColumnType(_, _, _) => true,
                 _ => false,
             }
         }
@@ -246,102 +248,94 @@ mod test {
         let row = rows.next().unwrap().unwrap();
 
         // check the correct types come back as expected
-        assert_eq!(vec![1, 2], row.get_checked::<_, Vec<u8>>(0).unwrap());
+        assert_eq!(vec![1, 2], row.get::<_, Vec<u8>>(0).unwrap());
-        assert_eq!("text", row.get_checked::<_, String>(1).unwrap());
+        assert_eq!("text", row.get::<_, String>(1).unwrap());
-        assert_eq!(1, row.get_checked::<_, c_int>(2).unwrap());
+        assert_eq!(1, row.get::<_, c_int>(2).unwrap());
-        assert!((1.5 - row.get_checked::<_, c_double>(3).unwrap()).abs() < EPSILON);
+        assert!((1.5 - row.get::<_, c_double>(3).unwrap()).abs() < EPSILON);
-        assert!(row.get_checked::<_, Option<c_int>>(4).unwrap().is_none());
+        assert!(row.get::<_, Option<c_int>>(4).unwrap().is_none());
-        assert!(row.get_checked::<_, Option<c_double>>(4).unwrap().is_none());
+        assert!(row.get::<_, Option<c_double>>(4).unwrap().is_none());
-        assert!(row.get_checked::<_, Option<String>>(4).unwrap().is_none());
+        assert!(row.get::<_, Option<String>>(4).unwrap().is_none());
 
         // check some invalid types
 
         // 0 is actually a blob (Vec<u8>)
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_int>(0).err().unwrap()
+            row.get::<_, c_int>(0).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_int>(0).err().unwrap()
+            row.get::<_, c_int>(0).err().unwrap()
+        ));
+        assert!(is_invalid_column_type(row.get::<_, i64>(0).err().unwrap()));
+        assert!(is_invalid_column_type(
+            row.get::<_, c_double>(0).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, i64>(0).err().unwrap()
+            row.get::<_, String>(0).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_double>(0).err().unwrap()
+            row.get::<_, time::Timespec>(0).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, String>(0).err().unwrap()
+            row.get::<_, Option<c_int>>(0).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, time::Timespec>(0).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Option<c_int>>(0).err().unwrap()
         ));
 
         // 1 is actually a text (String)
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_int>(1).err().unwrap()
+            row.get::<_, c_int>(1).err().unwrap()
+        ));
+        assert!(is_invalid_column_type(row.get::<_, i64>(1).err().unwrap()));
+        assert!(is_invalid_column_type(
+            row.get::<_, c_double>(1).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, i64>(1).err().unwrap()
+            row.get::<_, Vec<u8>>(1).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_double>(1).err().unwrap()
+            row.get::<_, Option<c_int>>(1).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Vec<u8>>(1).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Option<c_int>>(1).err().unwrap()
         ));
 
         // 2 is actually an integer
         assert!(is_invalid_column_type(
-            row.get_checked::<_, String>(2).err().unwrap()
+            row.get::<_, String>(2).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, Vec<u8>>(2).err().unwrap()
+            row.get::<_, Vec<u8>>(2).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, Option<String>>(2).err().unwrap()
+            row.get::<_, Option<String>>(2).err().unwrap()
         ));
 
         // 3 is actually a float (c_double)
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_int>(3).err().unwrap()
+            row.get::<_, c_int>(3).err().unwrap()
+        ));
+        assert!(is_invalid_column_type(row.get::<_, i64>(3).err().unwrap()));
+        assert!(is_invalid_column_type(
+            row.get::<_, String>(3).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, i64>(3).err().unwrap()
+            row.get::<_, Vec<u8>>(3).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, String>(3).err().unwrap()
+            row.get::<_, Option<c_int>>(3).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Vec<u8>>(3).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Option<c_int>>(3).err().unwrap()
         ));
 
         // 4 is actually NULL
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_int>(4).err().unwrap()
+            row.get::<_, c_int>(4).err().unwrap()
+        ));
+        assert!(is_invalid_column_type(row.get::<_, i64>(4).err().unwrap()));
+        assert!(is_invalid_column_type(
+            row.get::<_, c_double>(4).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, i64>(4).err().unwrap()
+            row.get::<_, String>(4).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, c_double>(4).err().unwrap()
+            row.get::<_, Vec<u8>>(4).err().unwrap()
         ));
         assert!(is_invalid_column_type(
-            row.get_checked::<_, String>(4).err().unwrap()
+            row.get::<_, time::Timespec>(4).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, Vec<u8>>(4).err().unwrap()
-        ));
-        assert!(is_invalid_column_type(
-            row.get_checked::<_, time::Timespec>(4).err().unwrap()
         ));
     }
 
@@ -360,19 +354,16 @@ mod test {
         let mut rows = stmt.query(NO_PARAMS).unwrap();
 
         let row = rows.next().unwrap().unwrap();
-        assert_eq!(
+        assert_eq!(Value::Blob(vec![1, 2]), row.get::<_, Value>(0).unwrap());
-            Value::Blob(vec![1, 2]),
-            row.get_checked::<_, Value>(0).unwrap()
-        );
         assert_eq!(
             Value::Text(String::from("text")),
-            row.get_checked::<_, Value>(1).unwrap()
+            row.get::<_, Value>(1).unwrap()
         );
-        assert_eq!(Value::Integer(1), row.get_checked::<_, Value>(2).unwrap());
+        assert_eq!(Value::Integer(1), row.get::<_, Value>(2).unwrap());
-        match row.get_checked::<_, Value>(3).unwrap() {
+        match row.get::<_, Value>(3).unwrap() {
             Value::Real(val) => assert!((1.5 - val).abs() < EPSILON),
             x => panic!("Invalid Value {:?}", x),
         }
-        assert_eq!(Value::Null, row.get_checked::<_, Value>(4).unwrap());
+        assert_eq!(Value::Null, row.get::<_, Value>(4).unwrap());
     }
 }

src/types/serde_json.rs

@@ -1,7 +1,6 @@
 //! `ToSql` and `FromSql` implementation for JSON `Value`.
-use serde_json;
 
-use self::serde_json::Value;
+use serde_json::Value;
 
 use crate::types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};
 use crate::Result;
@@ -17,7 +16,7 @@ impl ToSql for Value {
 impl FromSql for Value {
     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
         match value {
-            ValueRef::Text(s) => serde_json::from_str(s),
+            ValueRef::Text(s) => serde_json::from_slice(s),
             ValueRef::Blob(b) => serde_json::from_slice(b),
             _ => return Err(FromSqlError::InvalidType),
         }
@@ -27,9 +26,9 @@ impl FromSql for Value {
 
 #[cfg(test)]
 mod test {
-    use super::serde_json;
     use crate::types::ToSql;
     use crate::{Connection, NO_PARAMS};
+    use serde_json;
 
     fn checked_memory_handle() -> Connection {
         let db = Connection::open_in_memory().unwrap();

src/types/time.rs

@@ -36,8 +36,8 @@ impl FromSql for time::Timespec {
 
 #[cfg(test)]
 mod test {
-    use super::time;
     use crate::{Connection, Result, NO_PARAMS};
+    use time;
 
     fn checked_memory_handle() -> Connection {
         let db = Connection::open_in_memory().unwrap();

src/types/to_sql.rs

@@ -40,7 +40,7 @@ where
 // be converted into Values.
 macro_rules! from_value(
     ($t:ty) => (
-        impl<'a> From<$t> for ToSqlOutput<'a> {
+        impl From<$t> for ToSqlOutput<'_> {
             fn from(t: $t) -> Self { ToSqlOutput::Owned(t.into())}
         }
     )
@@ -65,7 +65,10 @@ from_value!(Vec<u8>);
 #[cfg(feature = "i128_blob")]
 from_value!(i128);
 
-impl<'a> ToSql for ToSqlOutput<'a> {
+#[cfg(feature = "uuid")]
+from_value!(uuid::Uuid);
+
+impl ToSql for ToSqlOutput<'_> {
     fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
         Ok(match *self {
             ToSqlOutput::Borrowed(v) => ToSqlOutput::Borrowed(v),
@@ -84,6 +87,13 @@ pub trait ToSql {
     fn to_sql(&self) -> Result<ToSqlOutput<'_>>;
 }
 
+impl ToSql for Box<dyn ToSql> {
+    fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
+        let derefed: &dyn ToSql = &**self;
+        derefed.to_sql()
+    }
+}
+
 // We should be able to use a generic impl like this:
 //
 // impl<T: Copy> ToSql for T where T: Into<Value> {
@@ -121,7 +131,10 @@ to_sql_self!(f64);
 #[cfg(feature = "i128_blob")]
 to_sql_self!(i128);
 
-impl<'a, T: ?Sized> ToSql for &'a T
+#[cfg(feature = "uuid")]
+to_sql_self!(uuid::Uuid);
+
+impl<T: ?Sized> ToSql for &'_ T
 where
     T: ToSql,
 {
@@ -169,7 +182,7 @@ impl<T: ToSql> ToSql for Option<T> {
     }
 }
 
-impl<'a> ToSql for Cow<'a, str> {
+impl ToSql for Cow<'_, str> {
     fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
         Ok(ToSqlOutput::from(self.as_ref()))
     }
@@ -229,7 +242,7 @@ mod test {
 
         let res = stmt
             .query_map(NO_PARAMS, |row| {
-                (row.get::<_, i128>(0), row.get::<_, String>(1))
+                Ok((row.get::<_, i128>(0)?, row.get::<_, String>(1)?))
             })
             .unwrap()
             .collect::<Result<Vec<_>, _>>()
@@ -248,4 +261,36 @@ mod test {
             ]
         );
     }
+
+    #[cfg(feature = "uuid")]
+    #[test]
+    fn test_uuid() {
+        use crate::{params, Connection};
+        use uuid::Uuid;
+
+        let db = Connection::open_in_memory().unwrap();
+        db.execute_batch("CREATE TABLE foo (id BLOB CHECK(length(id) = 16), label TEXT);")
+            .unwrap();
+
+        let id = Uuid::new_v4();
+
+        db.execute(
+            "INSERT INTO foo (id, label) VALUES (?, ?)",
+            params![id, "target"],
+        )
+        .unwrap();
+
+        let mut stmt = db
+            .prepare("SELECT id, label FROM foo WHERE id = ?")
+            .unwrap();
+
+        let mut rows = stmt.query(params![id]).unwrap();
+        let row = rows.next().unwrap().unwrap();
+
+        let found_id: Uuid = row.get_unwrap(0);
+        let found_label: String = row.get_unwrap(1);
+
+        assert_eq!(found_id, id);
+        assert_eq!(found_label, "target");
+    }
 }

src/types/url.rs

@@ -0,0 +1,81 @@
+//! `ToSql` and `FromSql` implementation for [`url::Url`].
+use crate::types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};
+use crate::Result;
+use url::Url;
+
+/// Serialize `Url` to text.
+impl ToSql for Url {
+    fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
+        Ok(ToSqlOutput::from(self.as_str()))
+    }
+}
+
+/// Deserialize text to `Url`.
+impl FromSql for Url {
+    fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
+        match value {
+            ValueRef::Text(s) => {
+                let s = std::str::from_utf8(s).map_err(|e| FromSqlError::Other(Box::new(e)))?;
+                Url::parse(s).map_err(|e| FromSqlError::Other(Box::new(e)))
+            }
+            _ => Err(FromSqlError::InvalidType),
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::{params, Connection, Error, Result};
+    use url::{ParseError, Url};
+
+    fn checked_memory_handle() -> Connection {
+        let db = Connection::open_in_memory().unwrap();
+        db.execute_batch("CREATE TABLE urls (i INTEGER, v TEXT)")
+            .unwrap();
+        db
+    }
+
+    fn get_url(db: &Connection, id: i64) -> Result<Url> {
+        db.query_row("SELECT v FROM urls WHERE i = ?", params![id], |r| r.get(0))
+    }
+
+    #[test]
+    fn test_sql_url() {
+        let db = &checked_memory_handle();
+
+        let url0 = Url::parse("http://www.example1.com").unwrap();
+        let url1 = Url::parse("http://www.example1.com/👌").unwrap();
+        let url2 = "http://www.example2.com/👌";
+
+        db.execute(
+            "INSERT INTO urls (i, v) VALUES (0, ?), (1, ?), (2, ?), (3, ?)",
+            // also insert a non-hex encoded url (which might be present if it was
+            // inserted separately)
+            params![url0, url1, url2, "illegal"],
+        )
+        .unwrap();
+
+        assert_eq!(get_url(db, 0).unwrap(), url0);
+
+        assert_eq!(get_url(db, 1).unwrap(), url1);
+
+        // Should successfully read it, even though it wasn't inserted as an
+        // escaped url.
+        let out_url2: Url = get_url(db, 2).unwrap();
+        assert_eq!(out_url2, Url::parse(url2).unwrap());
+
+        // Make sure the conversion error comes through correctly.
+        let err = get_url(db, 3).unwrap_err();
+        match err {
+            Error::FromSqlConversionFailure(_, _, e) => {
+                assert_eq!(
+                    *e.downcast::<ParseError>().unwrap(),
+                    ParseError::RelativeUrlWithoutBase,
+                );
+            }
+            e => {
+                panic!("Expected conversion failure, got {}", e);
+            }
+        }
+    }
+}

src/types/value.rs

@@ -48,6 +48,13 @@ impl From<i128> for Value {
     }
 }
 
+#[cfg(feature = "uuid")]
+impl From<uuid::Uuid> for Value {
+    fn from(id: uuid::Uuid) -> Value {
+        Value::Blob(id.as_bytes().to_vec())
+    }
+}
+
 macro_rules! from_i64(
     ($t:ty) => (
         impl From<$t> for Value {

src/types/value_ref.rs

@@ -14,12 +14,12 @@ pub enum ValueRef<'a> {
     /// The value is a floating point number.
     Real(f64),
     /// The value is a text string.
-    Text(&'a str),
+    Text(&'a [u8]),
     /// The value is a blob of data
     Blob(&'a [u8]),
 }
 
-impl<'a> ValueRef<'a> {
+impl ValueRef<'_> {
     pub fn data_type(&self) -> Type {
         match *self {
             ValueRef::Null => Type::Null,
@@ -54,7 +54,9 @@ impl<'a> ValueRef<'a> {
     /// `Err(Error::InvalidColumnType)`.
     pub fn as_str(&self) -> FromSqlResult<&'a str> {
         match *self {
-            ValueRef::Text(t) => Ok(t),
+            ValueRef::Text(t) => {
+                std::str::from_utf8(t).map_err(|e| FromSqlError::Other(Box::new(e)))
+            }
             _ => Err(FromSqlError::InvalidType),
         }
     }
@@ -69,13 +71,16 @@ impl<'a> ValueRef<'a> {
     }
 }
 
-impl<'a> From<ValueRef<'a>> for Value {
+impl From<ValueRef<'_>> for Value {
     fn from(borrowed: ValueRef<'_>) -> Value {
         match borrowed {
             ValueRef::Null => Value::Null,
             ValueRef::Integer(i) => Value::Integer(i),
             ValueRef::Real(r) => Value::Real(r),
-            ValueRef::Text(s) => Value::Text(s.to_string()),
+            ValueRef::Text(s) => {
+                let s = std::str::from_utf8(s).expect("invalid UTF-8");
+                Value::Text(s.to_string())
+            }
             ValueRef::Blob(b) => Value::Blob(b.to_vec()),
         }
     }
@@ -83,7 +88,7 @@ impl<'a> From<ValueRef<'a>> for Value {
 
 impl<'a> From<&'a str> for ValueRef<'a> {
     fn from(s: &str) -> ValueRef<'_> {
-        ValueRef::Text(s)
+        ValueRef::Text(s.as_bytes())
     }
 }
 
@@ -99,7 +104,7 @@ impl<'a> From<&'a Value> for ValueRef<'a> {
             Value::Null => ValueRef::Null,
             Value::Integer(i) => ValueRef::Integer(i),
             Value::Real(r) => ValueRef::Real(r),
-            Value::Text(ref s) => ValueRef::Text(s),
+            Value::Text(ref s) => ValueRef::Text(s.as_bytes()),
             Value::Blob(ref b) => ValueRef::Blob(b),
         }
     }
@@ -125,10 +130,7 @@ impl<'a> ValueRef<'a> {
                 );
                 let s = CStr::from_ptr(text as *const c_char);
 
-                // sqlite3_value_text returns UTF8 data, so our unwrap here should be fine.
+                let s = s.to_bytes();
-                let s = s
-                    .to_str()
-                    .expect("sqlite3_value_text returned invalid UTF-8");
                 ValueRef::Text(s)
             }
             ffi::SQLITE_BLOB => {

src/vtab/array.rs

@@ -35,7 +35,7 @@ pub fn load_module(conn: &Connection) -> Result<()> {
     conn.create_module("rarray", &ARRAY_MODULE, aux)
 }
 
-lazy_static! {
+lazy_static::lazy_static! {
     static ref ARRAY_MODULE: Module<ArrayTab> = eponymous_only_module::<ArrayTab>(1);
 }
 

src/vtab/csvtab.rs

@@ -32,7 +32,7 @@ pub fn load_module(conn: &Connection) -> Result<()> {
     conn.create_module("csv", &CSV_MODULE, aux)
 }
 
-lazy_static! {
+lazy_static::lazy_static! {
     static ref CSV_MODULE: Module<CSVTab> = read_only_module::<CSVTab>(1);
 }
 
@@ -347,6 +347,7 @@ impl From<csv::Error> for Error {
 mod test {
     use crate::vtab::csvtab;
     use crate::{Connection, Result, NO_PARAMS};
+    use fallible_iterator::FallibleIterator;
 
     #[test]
     fn test_csv_module() {
@@ -363,8 +364,9 @@ mod test {
             }
 
             let ids: Result<Vec<i32>> = s
-                .query_map(NO_PARAMS, |row| row.get::<_, i32>(0))
+                .query(NO_PARAMS)
                 .unwrap()
+                .map(|row| row.get::<_, i32>(0))
                 .collect();
             let sum = ids.unwrap().iter().sum::<i32>();
             assert_eq!(sum, 15);
@@ -389,7 +391,7 @@ mod test {
 
             let mut rows = s.query(NO_PARAMS).unwrap();
             let row = rows.next().unwrap().unwrap();
-            assert_eq!(row.get::<_, i32>(0), 2);
+            assert_eq!(row.get_unwrap::<_, i32>(0), 2);
         }
         db.execute_batch("DROP TABLE vtab").unwrap();
     }

src/vtab/mod.rs

@@ -67,6 +67,7 @@ pub struct Module<T: VTab> {
     phantom: PhantomData<T>,
 }
 
+unsafe impl<T: VTab> Send for Module<T> {}
 unsafe impl<T: VTab> Sync for Module<T> {}
 
 /// Create a read-only virtual table implementation.
@@ -233,7 +234,7 @@ pub trait CreateVTab: VTab {
     }
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[doc = "Index constraint operator."]
     #[repr(C)]
     pub struct IndexConstraintOp: ::std::os::raw::c_uchar {
@@ -337,7 +338,7 @@ impl<'a> Iterator for IndexConstraintIter<'a> {
 /// WHERE clause constraint
 pub struct IndexConstraint<'a>(&'a ffi::sqlite3_index_constraint);
 
-impl<'a> IndexConstraint<'a> {
+impl IndexConstraint<'_> {
     /// Column constrained.  -1 for ROWID
     pub fn column(&self) -> c_int {
         self.0.iColumn
@@ -357,7 +358,7 @@ impl<'a> IndexConstraint<'a> {
 /// Information about what parameters to pass to `VTabCursor.filter`.
 pub struct IndexConstraintUsage<'a>(&'a mut ffi::sqlite3_index_constraint_usage);
 
-impl<'a> IndexConstraintUsage<'a> {
+impl IndexConstraintUsage<'_> {
     /// if `argv_index` > 0, constraint is part of argv to `VTabCursor.filter`
     pub fn set_argv_index(&mut self, argv_index: c_int) {
         self.0.argvIndex = argv_index;
@@ -388,7 +389,7 @@ impl<'a> Iterator for OrderByIter<'a> {
 /// A column of the ORDER BY clause.
 pub struct OrderBy<'a>(&'a ffi::sqlite3_index_info_sqlite3_index_orderby);
 
-impl<'a> OrderBy<'a> {
+impl OrderBy<'_> {
     /// Column number
     pub fn column(&self) -> c_int {
         self.0.iColumn
@@ -453,7 +454,7 @@ pub struct Values<'a> {
     args: &'a [*mut ffi::sqlite3_value],
 }
 
-impl<'a> Values<'a> {
+impl Values<'_> {
     pub fn len(&self) -> usize {
         self.args.len()
     }
@@ -472,7 +473,13 @@ impl<'a> Values<'a> {
             }
             FromSqlError::OutOfRange(i) => Error::IntegralValueOutOfRange(idx, i),
             #[cfg(feature = "i128_blob")]
-            FromSqlError::InvalidI128Size(_) => Error::InvalidColumnType(idx, value.data_type()),
+            FromSqlError::InvalidI128Size(_) => {
+                Error::InvalidColumnType(idx, idx.to_string(), value.data_type())
+            }
+            #[cfg(feature = "uuid")]
+            FromSqlError::InvalidUuidSize(_) => {
+                Error::FromSqlConversionFailure(idx, value.data_type(), Box::new(err))
+            }
         })
     }
 
@@ -641,7 +648,6 @@ where
 {
     use std::error::Error as StdError;
     use std::ffi::CStr;
-    use std::slice;
 
     let mut conn = VTabConnection(db);
     let aux = aux as *mut T::Aux;
@@ -695,7 +701,6 @@ where
 {
     use std::error::Error as StdError;
     use std::ffi::CStr;
-    use std::slice;
 
     let mut conn = VTabConnection(db);
     let aux = aux as *mut T::Aux;
@@ -848,7 +853,6 @@ where
     C: VTabCursor,
 {
     use std::ffi::CStr;
-    use std::slice;
     use std::str;
     let idx_name = if idx_str.is_null() {
         None
@@ -981,7 +985,7 @@ fn mprintf(err_msg: &str) -> *mut c_char {
 pub mod array;
 #[cfg(feature = "csvtab")]
 pub mod csvtab;
-#[cfg(feature = "bundled")]
+#[cfg(feature = "series")]
 pub mod series; // SQLite >= 3.9.0
 
 #[cfg(test)]

src/vtab/series.rs

@@ -18,7 +18,7 @@ pub fn load_module(conn: &Connection) -> Result<()> {
     conn.create_module("generate_series", &SERIES_MODULE, aux)
 }
 
-lazy_static! {
+lazy_static::lazy_static! {
     static ref SERIES_MODULE: Module<SeriesTab> = eponymous_only_module::<SeriesTab>(1);
 }
 
@@ -28,7 +28,7 @@ const SERIES_COLUMN_START: c_int = 1;
 const SERIES_COLUMN_STOP: c_int = 2;
 const SERIES_COLUMN_STEP: c_int = 3;
 
-bitflags! {
+bitflags::bitflags! {
     #[repr(C)]
     struct QueryPlanFlags: ::std::os::raw::c_int {
         // start = $value  -- constraint exists

tests/config_log.rs

@@ -2,12 +2,9 @@
 //! function affects SQLite process-wide and so is not safe to run as a normal
 //! #[test] in the library.
 
-#[cfg(feature = "trace")]
-#[macro_use]
-extern crate lazy_static;
-
 #[cfg(feature = "trace")]
 fn main() {
+    use lazy_static::lazy_static;
     use std::os::raw::c_int;
     use std::sync::Mutex;