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158 lines
7.2 KiB
Markdown
158 lines
7.2 KiB
Markdown
# Rusqlite
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[](https://travis-ci.org/jgallagher/rusqlite)
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[](https://ci.appveyor.com/project/jgallagher/rusqlite) [](https://crates.io/crates/rusqlite)
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Rusqlite is an ergonomic wrapper for using SQLite from Rust. It attempts to expose
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an interface similar to [rust-postgres](https://github.com/sfackler/rust-postgres). View the full
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[API documentation](http://docs.rs/rusqlite/).
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```rust
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extern crate rusqlite;
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extern crate time;
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use time::Timespec;
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use rusqlite::Connection;
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#[derive(Debug)]
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struct Person {
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id: i32,
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name: String,
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time_created: Timespec,
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data: Option<Vec<u8>>
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}
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fn main() {
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let conn = Connection::open_in_memory().unwrap();
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conn.execute("CREATE TABLE person (
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id INTEGER PRIMARY KEY,
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name TEXT NOT NULL,
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time_created TEXT NOT NULL,
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data BLOB
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)", &[]).unwrap();
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let me = Person {
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id: 0,
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name: "Steven".to_string(),
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time_created: time::get_time(),
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data: None
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};
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conn.execute("INSERT INTO person (name, time_created, data)
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VALUES (?1, ?2, ?3)",
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&[&me.name, &me.time_created, &me.data]).unwrap();
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let mut stmt = conn.prepare("SELECT id, name, time_created, data FROM person").unwrap();
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let person_iter = stmt.query_map(&[], |row| {
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Person {
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id: row.get(0),
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name: row.get(1),
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time_created: row.get(2),
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data: row.get(3)
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}
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}).unwrap();
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for person in person_iter {
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println!("Found person {:?}", person.unwrap());
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}
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}
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```
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### Supported SQLite Versions
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The base `rusqlite` package supports SQLite version 3.6.8 or newer. If you need
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support for older versions, please file an issue. Some cargo features require a
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newer SQLite version; see details below.
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### Optional Features
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Rusqlite provides several features that are behind [Cargo
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features](http://doc.crates.io/manifest.html#the-features-section). They are:
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* [`load_extension`](http://jgallagher.github.io/rusqlite/rusqlite/struct.LoadExtensionGuard.html)
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allows loading dynamic library-based SQLite extensions.
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* [`backup`](http://jgallagher.github.io/rusqlite/rusqlite/backup/index.html)
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allows use of SQLite's online backup API. Note: This feature requires SQLite 3.6.11 or later.
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* [`functions`](http://jgallagher.github.io/rusqlite/rusqlite/functions/index.html)
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allows you to load Rust closures into SQLite connections for use in queries.
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Note: This feature requires SQLite 3.7.3 or later.
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* [`trace`](http://jgallagher.github.io/rusqlite/rusqlite/trace/index.html)
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allows hooks into SQLite's tracing and profiling APIs. Note: This feature
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requires SQLite 3.6.23 or later.
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* [`blob`](http://jgallagher.github.io/rusqlite/rusqlite/blob/index.html)
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gives `std::io::{Read, Write, Seek}` access to SQL BLOBs. Note: This feature
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requires SQLite 3.7.4 or later.
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* [`limits`](http://jgallagher.github.io/rusqlite/rusqlite/struct.Connection.html#method.limit)
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allows you to set and retrieve SQLite's per connection limits.
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* `chrono` implements [`FromSql`](http://jgallagher.github.io/rusqlite/rusqlite/types/trait.FromSql.html)
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and [`ToSql`](http://jgallagher.github.io/rusqlite/rusqlite/types/trait.ToSql.html) for various
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types from the [`chrono` crate](https://crates.io/crates/chrono).
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* `serde_json` implements [`FromSql`](http://jgallagher.github.io/rusqlite/rusqlite/types/trait.FromSql.html)
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and [`ToSql`](http://jgallagher.github.io/rusqlite/rusqlite/types/trait.ToSql.html) for the
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`Value` type from the [`serde_json` crate](https://crates.io/crates/serde_json).
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* `bundled` uses a bundled version of sqlite3. This is a good option for cases where linking to sqlite3 is complicated, such as Windows.
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## Notes on building rusqlite and libsqlite3-sys
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`libsqlite3-sys` is a separate crate from `rusqlite` that provides the Rust
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declarations for SQLite's C API. By default, `libsqlite3-sys` attempts to find a SQLite library that already exists on your system using pkg-config, or a
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[Vcpkg](https://github.com/Microsoft/vcpkg) installation for MSVC ABI builds.
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You can adjust this behavior in a number of ways:
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* If you use the `bundled` feature, `libsqlite3-sys` will use the
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[gcc](https://crates.io/crates/gcc) crate to compile SQLite from source and
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link against that. This source is embedded in the `libsqlite3-sys` crate and
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is currently SQLite 3.17.0 (as of `rusqlite` 0.10.1 / `libsqlite3-sys`
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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:
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```
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[dependencies.rusqlite]
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version = "0.11.0"
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features = ["bundled"]
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```
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* You can set the `SQLITE3_LIB_DIR` to point to directory containing the SQLite
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library.
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* Installing the sqlite3 development packages will usually be all that is required, but
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the build helpers for [pkg-config](https://github.com/alexcrichton/pkg-config-rs)
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and [vcpkg](https://github.com/mcgoo/vcpkg-rs) have some additional configuration
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options. The default when using vcpkg is to dynamically link. `vcpkg install sqlite3:x64-windows` will install the required library.
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### Binding generation
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We use [bindgen](https://crates.io/crates/bindgen) to generate the Rust
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declarations from SQLite's C header file. `bindgen`
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[recommends](https://github.com/servo/rust-bindgen#library-usage-with-buildrs)
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running this as part of the build process of libraries that used this. We tried
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this briefly (`rusqlite` 0.10.0, specifically), but it had some annoyances:
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* The build time for `libsqlite3-sys` (and therefore `rusqlite`) increased
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dramatically.
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* Running `bindgen` requires a relatively-recent version of Clang, which many
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systems do not have installed by default.
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* Running `bindgen` also requires the SQLite header file to be present.
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As of `rusqlite` 0.10.1, we avoid running `bindgen` at build-time by shipping
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pregenerated bindings for several versions of SQLite. When compiling
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`rusqlite`, we use your selected Cargo features to pick the bindings for the
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minimum SQLite version that supports your chosen features. If you are using
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`libsqlite3-sys` directly, you can use the same features to choose which
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pregenerated bindings are chosen:
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* `min_sqlite_version_3_6_8` - SQLite 3.6.8 bindings (this is the default)
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* `min_sqlite_version_3_6_11` - SQLite 3.6.11 bindings
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* `min_sqlite_version_3_6_23` - SQLite 3.6.23 bindings
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* `min_sqlite_version_3_7_3` - SQLite 3.7.3 bindings
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* `min_sqlite_version_3_7_4` - SQLite 3.7.4 bindings
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If you use the `bundled` feature, you will get pregenerated bindings for the
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bundled version of SQLite. If you need other specific pregenerated binding
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versions, please file an issue. If you want to run `bindgen` at buildtime to
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produce your own bindings, use the `buildtime_bindgen` Cargo feature.
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## Author
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John Gallagher, johnkgallagher@gmail.com
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## License
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Rusqlite is available under the MIT license. See the LICENSE file for more info.
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