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

README.md

@@ -68,7 +68,7 @@ newer SQLite version; see details below.
 ### Optional Features
 
 Rusqlite provides several features that are behind [Cargo
-features](http://doc.crates.io/manifest.html#the-features-section). They are:
+features](https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section). They are:
 
 * [`load_extension`](http://jgallagher.github.io/rusqlite/rusqlite/struct.LoadExtensionGuard.html)
   allows loading dynamic library-based SQLite extensions.
@@ -105,11 +105,11 @@ 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 3.17.0 (as of `rusqlite` 0.10.1 / `libsqlite3-sys`
+  is currently SQLite 3.24.0 (as of `rusqlite` 0.14.0 / `libsqlite3-sys`
-  0.7.1).  This is probably the simplest solution to any build problems. You can enable this by adding the following in your `Cargo.toml` file:
+  0.9.3).  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 = "0.11.0"
+  version = "0.14.0"
   features = ["bundled"]
   ```
 * You can set the `SQLITE3_LIB_DIR` to point to directory containing the SQLite

appveyor.yml

@@ -1,8 +1,8 @@
 environment:
   matrix:
-  - TARGET: 1.25.0-x86_64-pc-windows-gnu
+  - TARGET: 1.27.2-x86_64-pc-windows-gnu
     MSYS2_BITS: 64
-  - TARGET: 1.25.0-x86_64-pc-windows-msvc
+  - TARGET: 1.27.2-x86_64-pc-windows-msvc
     VCPKG_DEFAULT_TRIPLET: x64-windows
     VCPKGRS_DYNAMIC: 1
   - TARGET: nightly-x86_64-pc-windows-msvc

libsqlite3-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libsqlite3-sys"
-version = "0.9.2"
+version = "0.9.3"
 authors = ["John Gallagher <jgallagher@bignerdranch.com>"]
 repository = "https://github.com/jgallagher/rusqlite"
 description = "Native bindings to the libsqlite3 library"

libsqlite3-sys/build.rs

@@ -43,6 +43,8 @@ mod build {
             cfg.flag("-DSQLITE_ENABLE_UNLOCK_NOTIFY");
         }
         cfg.compile("libsqlite3.a");
+
+        println!("cargo:lib_dir={}", out_dir);
     }
 }
 

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"3.22.0\0";
+pub const SQLITE_VERSION: &'static [u8; 7usize] = b"3.24.0\0";
-pub const SQLITE_VERSION_NUMBER: i32 = 3022000;
+pub const SQLITE_VERSION_NUMBER: i32 = 3024000;
 pub const SQLITE_SOURCE_ID: &'static [u8; 85usize] =
-    b"2018-01-22 18:45:57 0c55d179733b46d8d0ba4d88e01a25e10677046ee3da1d5b1581e86726f2171d\0";
+    b"2018-06-04 19:24:41 c7ee0833225bfd8c5ec2f9bf62b97c4e04d03bd9566366d5221ac8fb199a87ca\0";
 pub const SQLITE_OK: i32 = 0;
 pub const SQLITE_ERROR: i32 = 1;
 pub const SQLITE_INTERNAL: i32 = 2;
@@ -70,6 +70,7 @@ pub const SQLITE_IOERR_BEGIN_ATOMIC: i32 = 7434;
 pub const SQLITE_IOERR_COMMIT_ATOMIC: i32 = 7690;
 pub const SQLITE_IOERR_ROLLBACK_ATOMIC: i32 = 7946;
 pub const SQLITE_LOCKED_SHAREDCACHE: i32 = 262;
+pub const SQLITE_LOCKED_VTAB: i32 = 518;
 pub const SQLITE_BUSY_RECOVERY: i32 = 261;
 pub const SQLITE_BUSY_SNAPSHOT: i32 = 517;
 pub const SQLITE_CANTOPEN_NOTEMPDIR: i32 = 270;
@@ -77,6 +78,7 @@ pub const SQLITE_CANTOPEN_ISDIR: i32 = 526;
 pub const SQLITE_CANTOPEN_FULLPATH: i32 = 782;
 pub const SQLITE_CANTOPEN_CONVPATH: i32 = 1038;
 pub const SQLITE_CORRUPT_VTAB: i32 = 267;
+pub const SQLITE_CORRUPT_SEQUENCE: i32 = 523;
 pub const SQLITE_READONLY_RECOVERY: i32 = 264;
 pub const SQLITE_READONLY_CANTLOCK: i32 = 520;
 pub const SQLITE_READONLY_ROLLBACK: i32 = 776;
@@ -174,6 +176,7 @@ pub const SQLITE_FCNTL_PDB: i32 = 30;
 pub const SQLITE_FCNTL_BEGIN_ATOMIC_WRITE: i32 = 31;
 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_GET_LOCKPROXYFILE: i32 = 2;
 pub const SQLITE_SET_LOCKPROXYFILE: i32 = 3;
 pub const SQLITE_LAST_ERRNO: i32 = 4;
@@ -211,6 +214,7 @@ pub const SQLITE_CONFIG_PCACHE_HDRSZ: i32 = 24;
 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_DBCONFIG_MAINDBNAME: i32 = 1000;
 pub const SQLITE_DBCONFIG_LOOKASIDE: i32 = 1001;
 pub const SQLITE_DBCONFIG_ENABLE_FKEY: i32 = 1002;
@@ -220,7 +224,8 @@ pub const SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION: i32 = 1005;
 pub const SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE: i32 = 1006;
 pub const SQLITE_DBCONFIG_ENABLE_QPSG: i32 = 1007;
 pub const SQLITE_DBCONFIG_TRIGGER_EQP: i32 = 1008;
-pub const SQLITE_DBCONFIG_MAX: i32 = 1008;
+pub const SQLITE_DBCONFIG_RESET_DATABASE: i32 = 1009;
+pub const SQLITE_DBCONFIG_MAX: i32 = 1009;
 pub const SQLITE_DENY: i32 = 1;
 pub const SQLITE_IGNORE: i32 = 2;
 pub const SQLITE_CREATE_INDEX: i32 = 1;
@@ -287,6 +292,8 @@ pub const SQLITE_UTF16: i32 = 4;
 pub const SQLITE_ANY: i32 = 5;
 pub const SQLITE_UTF16_ALIGNED: i32 = 8;
 pub const SQLITE_DETERMINISTIC: i32 = 2048;
+pub const SQLITE_WIN32_DATA_DIRECTORY_TYPE: i32 = 1;
+pub const SQLITE_WIN32_TEMP_DIRECTORY_TYPE: i32 = 2;
 pub const SQLITE_INDEX_SCAN_UNIQUE: i32 = 1;
 pub const SQLITE_INDEX_CONSTRAINT_EQ: i32 = 2;
 pub const SQLITE_INDEX_CONSTRAINT_GT: i32 = 4;
@@ -365,7 +372,8 @@ pub const SQLITE_DBSTATUS_CACHE_MISS: i32 = 8;
 pub const SQLITE_DBSTATUS_CACHE_WRITE: i32 = 9;
 pub const SQLITE_DBSTATUS_DEFERRED_FKS: i32 = 10;
 pub const SQLITE_DBSTATUS_CACHE_USED_SHARED: i32 = 11;
-pub const SQLITE_DBSTATUS_MAX: i32 = 11;
+pub const SQLITE_DBSTATUS_CACHE_SPILL: i32 = 12;
+pub const SQLITE_DBSTATUS_MAX: i32 = 12;
 pub const SQLITE_STMTSTATUS_FULLSCAN_STEP: i32 = 1;
 pub const SQLITE_STMTSTATUS_SORT: i32 = 2;
 pub const SQLITE_STMTSTATUS_AUTOINDEX: i32 = 3;
@@ -387,6 +395,10 @@ pub const SQLITE_SCANSTAT_EST: i32 = 2;
 pub const SQLITE_SCANSTAT_NAME: i32 = 3;
 pub const SQLITE_SCANSTAT_EXPLAIN: i32 = 4;
 pub const SQLITE_SCANSTAT_SELECTID: i32 = 5;
+pub const SQLITE_SERIALIZE_NOCOPY: i32 = 1;
+pub const SQLITE_DESERIALIZE_FREEONCLOSE: i32 = 1;
+pub const SQLITE_DESERIALIZE_RESIZEABLE: i32 = 2;
+pub const SQLITE_DESERIALIZE_READONLY: i32 = 4;
 pub const NOT_WITHIN: i32 = 0;
 pub const PARTLY_WITHIN: i32 = 1;
 pub const FULLY_WITHIN: i32 = 2;
@@ -2255,6 +2267,24 @@ extern "C" {
     #[link_name = "\u{1}sqlite3_data_directory"]
     pub static mut sqlite3_data_directory: *mut ::std::os::raw::c_char;
 }
+extern "C" {
+    pub fn sqlite3_win32_set_directory(
+        type_: ::std::os::raw::c_ulong,
+        zValue: *mut ::std::os::raw::c_void,
+    ) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_win32_set_directory8(
+        type_: ::std::os::raw::c_ulong,
+        zValue: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_win32_set_directory16(
+        type_: ::std::os::raw::c_ulong,
+        zValue: *const ::std::os::raw::c_void,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn sqlite3_get_autocommit(arg1: *mut sqlite3) -> ::std::os::raw::c_int;
 }
@@ -3412,6 +3442,72 @@ extern "C" {
 extern "C" {
     pub fn sqlite3_test_control(op: ::std::os::raw::c_int, ...) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn sqlite3_keyword_count() -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_keyword_name(
+        arg1: ::std::os::raw::c_int,
+        arg2: *mut *const ::std::os::raw::c_char,
+        arg3: *mut ::std::os::raw::c_int,
+    ) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_keyword_check(
+        arg1: *const ::std::os::raw::c_char,
+        arg2: ::std::os::raw::c_int,
+    ) -> ::std::os::raw::c_int;
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct sqlite3_str {
+    _unused: [u8; 0],
+}
+extern "C" {
+    pub fn sqlite3_str_new(arg1: *mut sqlite3) -> *mut sqlite3_str;
+}
+extern "C" {
+    pub fn sqlite3_str_finish(arg1: *mut sqlite3_str) -> *mut ::std::os::raw::c_char;
+}
+extern "C" {
+    pub fn sqlite3_str_appendf(arg1: *mut sqlite3_str, zFormat: *const ::std::os::raw::c_char, ...);
+}
+extern "C" {
+    pub fn sqlite3_str_vappendf(
+        arg1: *mut sqlite3_str,
+        zFormat: *const ::std::os::raw::c_char,
+        arg2: *mut __va_list_tag,
+    );
+}
+extern "C" {
+    pub fn sqlite3_str_append(
+        arg1: *mut sqlite3_str,
+        zIn: *const ::std::os::raw::c_char,
+        N: ::std::os::raw::c_int,
+    );
+}
+extern "C" {
+    pub fn sqlite3_str_appendall(arg1: *mut sqlite3_str, zIn: *const ::std::os::raw::c_char);
+}
+extern "C" {
+    pub fn sqlite3_str_appendchar(
+        arg1: *mut sqlite3_str,
+        N: ::std::os::raw::c_int,
+        C: ::std::os::raw::c_char,
+    );
+}
+extern "C" {
+    pub fn sqlite3_str_reset(arg1: *mut sqlite3_str);
+}
+extern "C" {
+    pub fn sqlite3_str_errcode(arg1: *mut sqlite3_str) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_str_length(arg1: *mut sqlite3_str) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn sqlite3_str_value(arg1: *mut sqlite3_str) -> *mut ::std::os::raw::c_char;
+}
 extern "C" {
     pub fn sqlite3_status(
         op: ::std::os::raw::c_int,
@@ -4070,6 +4166,24 @@ extern "C" {
         zDb: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn sqlite3_serialize(
+        db: *mut sqlite3,
+        zSchema: *const ::std::os::raw::c_char,
+        piSize: *mut sqlite3_int64,
+        mFlags: ::std::os::raw::c_uint,
+    ) -> *mut ::std::os::raw::c_uchar;
+}
+extern "C" {
+    pub fn sqlite3_deserialize(
+        db: *mut sqlite3,
+        zSchema: *const ::std::os::raw::c_char,
+        pData: *mut ::std::os::raw::c_uchar,
+        szDb: sqlite3_int64,
+        szBuf: sqlite3_int64,
+        mFlags: ::std::os::raw::c_uint,
+    ) -> ::std::os::raw::c_int;
+}
 pub type sqlite3_rtree_dbl = f64;
 extern "C" {
     pub fn sqlite3_rtree_geometry_callback(

libsqlite3-sys/sqlite3/sqlite3ext.h

@@ -295,6 +295,21 @@ struct sqlite3_api_routines {
   int (*vtab_nochange)(sqlite3_context*);
   int (*value_nochange)(sqlite3_value*);
   const char *(*vtab_collation)(sqlite3_index_info*,int);
+  /* Version 3.24.0 and later */
+  int (*keyword_count)(void);
+  int (*keyword_name)(int,const char**,int*);
+  int (*keyword_check)(const char*,int);
+  sqlite3_str *(*str_new)(sqlite3*);
+  char *(*str_finish)(sqlite3_str*);
+  void (*str_appendf)(sqlite3_str*, const char *zFormat, ...);
+  void (*str_vappendf)(sqlite3_str*, const char *zFormat, va_list);
+  void (*str_append)(sqlite3_str*, const char *zIn, int N);
+  void (*str_appendall)(sqlite3_str*, const char *zIn);
+  void (*str_appendchar)(sqlite3_str*, int N, char C);
+  void (*str_reset)(sqlite3_str*);
+  int (*str_errcode)(sqlite3_str*);
+  int (*str_length)(sqlite3_str*);
+  char *(*str_value)(sqlite3_str*);
 };
 
 /*
@@ -563,8 +578,23 @@ typedef int (*sqlite3_loadext_entry)(
 #define sqlite3_value_pointer          sqlite3_api->value_pointer
 /* Version 3.22.0 and later */
 #define sqlite3_vtab_nochange          sqlite3_api->vtab_nochange
-#define sqlite3_value_nochange         sqltie3_api->value_nochange
+#define sqlite3_value_nochange         sqlite3_api->value_nochange
-#define sqlite3_vtab_collation         sqltie3_api->vtab_collation
+#define sqlite3_vtab_collation         sqlite3_api->vtab_collation
+/* Version 3.24.0 and later */
+#define sqlite3_keyword_count          sqlite3_api->keyword_count
+#define sqlite3_keyword_name           sqlite3_api->keyword_name
+#define sqlite3_keyword_check          sqlite3_api->keyword_check
+#define sqlite3_str_new                sqlite3_api->str_new
+#define sqlite3_str_finish             sqlite3_api->str_finish
+#define sqlite3_str_appendf            sqlite3_api->str_appendf
+#define sqlite3_str_vappendf           sqlite3_api->str_vappendf
+#define sqlite3_str_append             sqlite3_api->str_append
+#define sqlite3_str_appendall          sqlite3_api->str_appendall
+#define sqlite3_str_appendchar         sqlite3_api->str_appendchar
+#define sqlite3_str_reset              sqlite3_api->str_reset
+#define sqlite3_str_errcode            sqlite3_api->str_errcode
+#define sqlite3_str_length             sqlite3_api->str_length
+#define sqlite3_str_value              sqlite3_api->str_value
 #endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */
 
 #if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)

libsqlite3-sys/upgrade.sh

@@ -4,7 +4,7 @@ cd $SCRIPT_DIR
 SQLITE3_LIB_DIR=$SCRIPT_DIR/sqlite3
 
 # Download and extract amalgamation
-SQLITE=sqlite-amalgamation-3220000
+SQLITE=sqlite-amalgamation-3240000
 curl -O http://sqlite.org/2018/$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

src/busy.rs

@@ -0,0 +1,160 @@
+///! Busy handler (when the database is locked)
+use std::time::Duration;
+use std::mem;
+use std::os::raw::{c_int, c_void};
+use std::ptr;
+
+use ffi;
+use {Connection, InnerConnection, Result};
+
+impl Connection {
+    /// Set a busy handler that sleeps for a specified amount of time when a table is locked.
+    /// The handler will sleep multiple times until at least "ms" milliseconds of sleeping have accumulated.
+    ///
+    /// Calling this routine with an argument equal to zero turns off all busy handlers.
+    //
+    /// There can only be a single busy handler for a particular database connection at any given moment.
+    /// If another busy handler was defined (using `busy_handler`) prior to calling this routine, that other busy handler is cleared.
+    pub fn busy_timeout(&self, timeout: Duration) -> Result<()> {
+        let ms = timeout
+            .as_secs()
+            .checked_mul(1000)
+            .and_then(|t| t.checked_add(timeout.subsec_millis().into()))
+            .expect("too big");
+        self.db.borrow_mut().busy_timeout(ms as i32)
+    }
+
+    /// Register a callback to handle `SQLITE_BUSY` errors.
+    ///
+    /// If the busy callback is `None`, then `SQLITE_BUSY is returned immediately upon encountering the lock.`
+    /// The argument to the busy handler callback is the number of times that the busy handler has been invoked previously for the same locking event.
+    /// If the busy callback returns `false`, then no additional attempts are made to access the database and `SQLITE_BUSY` is returned to the application.
+    /// If the callback returns `true`, then another attempt is made to access the database and the cycle repeats.
+    ///
+    /// There can only be a single busy handler defined for each database connection.
+    /// Setting a new busy handler clears any previously set handler.
+    /// Note that calling `busy_timeout()` or evaluating `PRAGMA busy_timeout=N` will change the busy handler and thus clear any previously set busy handler.
+    pub fn busy_handler(&self, callback: Option<fn(i32) -> bool>) -> Result<()> {
+        unsafe extern "C" fn busy_handler_callback(p_arg: *mut c_void, count: c_int) -> c_int {
+            let handler_fn: fn(i32) -> bool = mem::transmute(p_arg);
+            if handler_fn(count) {
+                1
+            } else {
+                0
+            }
+        }
+        let mut c = self.db.borrow_mut();
+        let r = match callback {
+            Some(f) => unsafe {
+                ffi::sqlite3_busy_handler(c.db(), Some(busy_handler_callback), mem::transmute(f))
+            },
+            None => unsafe { ffi::sqlite3_busy_handler(c.db(), None, ptr::null_mut()) },
+        };
+        c.decode_result(r)
+    }
+}
+
+impl InnerConnection {
+    fn busy_timeout(&mut self, timeout: c_int) -> Result<()> {
+        let r = unsafe { ffi::sqlite3_busy_timeout(self.db, timeout) };
+        self.decode_result(r)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    extern crate tempdir;
+    use self::tempdir::TempDir;
+    use std::sync::atomic::{AtomicBool, Ordering};
+    use std::sync::mpsc::sync_channel;
+    use std::time::Duration;
+    use std::thread;
+
+    use {Connection, Error, ErrorCode, TransactionBehavior};
+
+    #[test]
+    fn test_default_busy() {
+        let temp_dir = TempDir::new("test_default_busy").unwrap();
+        let path = temp_dir.path().join("test.db3");
+
+        let mut db1 = Connection::open(&path).unwrap();
+        let tx1 = db1
+            .transaction_with_behavior(TransactionBehavior::Exclusive)
+            .unwrap();
+        let db2 = Connection::open(&path).unwrap();
+        let r = db2.query_row("PRAGMA schema_version", &[], |_| unreachable!());
+        match r.unwrap_err() {
+            Error::SqliteFailure(err, _) => {
+                assert_eq!(err.code, ErrorCode::DatabaseBusy);
+            }
+            err => panic!("Unexpected error {}", err),
+        }
+        tx1.rollback().unwrap();
+    }
+
+    #[test]
+    fn test_busy_timeout() {
+        let temp_dir = TempDir::new("test_busy_timeout").unwrap();
+        let path = temp_dir.path().join("test.db3");
+
+        let db2 = Connection::open(&path).unwrap();
+        db2.busy_timeout(Duration::from_secs(1)).unwrap();
+
+        let (rx, tx) = sync_channel(0);
+        let child = thread::spawn(move || {
+            let mut db1 = Connection::open(&path).unwrap();
+            let tx1 = db1
+                .transaction_with_behavior(TransactionBehavior::Exclusive)
+                .unwrap();
+            rx.send(1).unwrap();
+            thread::sleep(Duration::from_millis(100));
+            tx1.rollback().unwrap();
+        });
+
+        assert_eq!(tx.recv().unwrap(), 1);
+        let _ =
+            db2.query_row("PRAGMA schema_version", &[], |row| {
+                row.get_checked::<_, i32>(0)
+            }).expect("unexpected error");
+
+        child.join().unwrap();
+    }
+
+    #[test]
+    fn test_busy_handler() {
+        lazy_static! {
+            static ref CALLED: AtomicBool = AtomicBool::new(false);
+        }
+        fn busy_handler(_: i32) -> bool {
+            CALLED.store(true, Ordering::Relaxed);
+            thread::sleep(Duration::from_millis(100));
+            true
+        }
+
+        let temp_dir = TempDir::new("test_busy_handler").unwrap();
+        let path = temp_dir.path().join("test.db3");
+
+        let db2 = Connection::open(&path).unwrap();
+        db2.busy_handler(Some(busy_handler)).unwrap();
+
+        let (rx, tx) = sync_channel(0);
+        let child = thread::spawn(move || {
+            let mut db1 = Connection::open(&path).unwrap();
+            let tx1 = db1
+                .transaction_with_behavior(TransactionBehavior::Exclusive)
+                .unwrap();
+            rx.send(1).unwrap();
+            thread::sleep(Duration::from_millis(100));
+            tx1.rollback().unwrap();
+        });
+
+        assert_eq!(tx.recv().unwrap(), 1);
+        let _ =
+            db2.query_row("PRAGMA schema_version", &[], |row| {
+                row.get_checked::<_, i32>(0)
+            }).expect("unexpected error");
+        assert_eq!(CALLED.load(Ordering::Relaxed), true);
+
+        child.join().unwrap();
+    }
+}

src/lib.rs

@@ -56,7 +56,7 @@ extern crate libsqlite3_sys as ffi;
 extern crate lru_cache;
 #[macro_use]
 extern crate bitflags;
-#[cfg(any(all(test, feature = "trace"), feature = "vtab"))]
+#[cfg(any(test, feature = "vtab"))]
 #[macro_use]
 extern crate lazy_static;
 
@@ -126,6 +126,7 @@ mod hooks;
 #[cfg(feature = "hooks")]
 pub use hooks::*;
 mod unlock_notify;
+mod busy;
 #[cfg(feature = "vtab")]
 pub mod vtab;
 #[cfg(any(feature = "functions", feature = "vtab"))]
@@ -627,7 +628,7 @@ bitflags! {
 
 impl Default for OpenFlags {
     fn default() -> OpenFlags {
-        OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE | 
+        OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE |
         OpenFlags::SQLITE_OPEN_NO_MUTEX | OpenFlags::SQLITE_OPEN_URI
     }
 }
@@ -994,6 +995,41 @@ mod test {
         Connection::open_in_memory().unwrap()
     }
 
+    #[test]
+    fn test_concurrent_transactions_busy_commit() {
+        let tmp = TempDir::new("locked").unwrap();
+        let path = tmp.path().join("transactions.db3");
+
+        Connection::open(&path).expect("create temp db").execute_batch("
+            BEGIN; CREATE TABLE foo(x INTEGER);
+            INSERT INTO foo VALUES(42); END;")
+        .expect("create temp db");
+
+        let mut db1 = Connection::open(&path).unwrap();
+        let mut db2 = Connection::open(&path).unwrap();
+
+        db1.execute_batch("PRAGMA busy_timeout = 0;").unwrap();
+        db2.execute_batch("PRAGMA busy_timeout = 0;").unwrap();
+
+        {
+            let tx1 = db1.transaction().unwrap();
+            let tx2 = db2.transaction().unwrap();
+
+            // SELECT first makes sqlite lock with a shared lock
+            let _ = tx1.query_row("SELECT x FROM foo LIMIT 1", &[], |_| ()).unwrap();
+            let _ = tx2.query_row("SELECT x FROM foo LIMIT 1", &[], |_| ()).unwrap();
+
+            tx1.execute("INSERT INTO foo VALUES(?1)", &[&1]).unwrap();
+            let _ = tx2.execute("INSERT INTO foo VALUES(?1)", &[&2]);
+
+            let _ = tx1.commit();
+            let _ = tx2.commit();
+        }
+
+        let _ = db1.transaction().expect("commit should have closed transaction");
+        let _ = db2.transaction().expect("commit should have closed transaction");
+    }
+
     #[test]
     #[cfg_attr(rustfmt, rustfmt_skip)]
     fn test_persistence() {

src/transaction.rs

@@ -167,8 +167,9 @@ impl<'conn> Transaction<'conn> {
     }
 
     fn commit_(&mut self) -> Result<()> {
+        self.conn.execute_batch("COMMIT")?;
         self.committed = true;
-        self.conn.execute_batch("COMMIT")
+        Ok(())
     }
 
     /// A convenience method which consumes and rolls back a transaction.
@@ -177,8 +178,9 @@ impl<'conn> Transaction<'conn> {
     }
 
     fn rollback_(&mut self) -> Result<()> {
+        self.conn.execute_batch("ROLLBACK")?;
         self.committed = true;
-        self.conn.execute_batch("ROLLBACK")
+        Ok(())
     }
 
     /// Consumes the transaction, committing or rolling back according to the current setting
@@ -195,7 +197,7 @@ impl<'conn> Transaction<'conn> {
             return Ok(());
         }
         match self.drop_behavior() {
-            DropBehavior::Commit => self.commit_(),
+            DropBehavior::Commit => self.commit_().or_else(|_| self.rollback_()),
             DropBehavior::Rollback => self.rollback_(),
             DropBehavior::Ignore => Ok(()),
             DropBehavior::Panic => panic!("Transaction dropped unexpectedly."),
@@ -277,9 +279,10 @@ impl<'conn> Savepoint<'conn> {
     }
 
     fn commit_(&mut self) -> Result<()> {
-        self.committed = true;
         self.conn
-            .execute_batch(&format!("RELEASE {}", self.name))
+            .execute_batch(&format!("RELEASE {}", self.name))?;
+        self.committed = true;
+        Ok(())
     }
 
     /// A convenience method which rolls back a savepoint.
@@ -307,7 +310,7 @@ impl<'conn> Savepoint<'conn> {
             return Ok(());
         }
         match self.drop_behavior() {
-            DropBehavior::Commit => self.commit_(),
+            DropBehavior::Commit => self.commit_().or_else(|_| self.rollback()),
             DropBehavior::Rollback => self.rollback(),
             DropBehavior::Ignore => Ok(()),
             DropBehavior::Panic => panic!("Savepoint dropped unexpectedly."),

src/types/to_sql.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use super::{Null, Value, ValueRef};
 #[cfg(feature = "array")]
 use vtab::array::Array;
@@ -156,6 +157,12 @@ impl<T: ToSql> ToSql for Option<T> {
     }
 }
 
+impl<'a> ToSql for Cow<'a, str> {
+    fn to_sql(&self) -> Result<ToSqlOutput> {
+        Ok(ToSqlOutput::from(self.as_ref()))
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::ToSql;
@@ -172,4 +179,16 @@ mod test {
         is_to_sql::<u16>();
         is_to_sql::<u32>();
     }
+
+    #[test]
+    fn test_cow_str() {
+        use std::borrow::Cow;
+        let s = "str";
+        let cow = Cow::Borrowed(s);
+        let r = cow.to_sql();
+        assert!(r.is_ok());
+        let cow = Cow::Owned::<str>(String::from(s));
+        let r = cow.to_sql();
+        assert!(r.is_ok());
+    }
 }