mirror of
https://github.com/isar/rusqlite.git
synced 2024-11-26 19:41:37 +08:00
175 lines
8.6 KiB
Markdown
175 lines
8.6 KiB
Markdown
# Rusqlite
|
|
|
|
[](https://travis-ci.org/jgallagher/rusqlite)
|
|
[](https://ci.appveyor.com/project/jgallagher/rusqlite)
|
|
[](https://deps.rs/repo/github/jgallagher/rusqlite)
|
|
[](https://crates.io/crates/rusqlite)
|
|
[](https://docs.rs/rusqlite)
|
|
|
|
Rusqlite is an ergonomic wrapper for using SQLite from Rust. It attempts to expose
|
|
an interface similar to [rust-postgres](https://github.com/sfackler/rust-postgres).
|
|
|
|
```rust
|
|
use rusqlite::{params, Connection, Result};
|
|
use time::Timespec;
|
|
|
|
#[derive(Debug)]
|
|
struct Person {
|
|
id: i32,
|
|
name: String,
|
|
time_created: Timespec,
|
|
data: Option<Vec<u8>>,
|
|
}
|
|
|
|
fn main() -> Result<()> {
|
|
let conn = Connection::open_in_memory()?;
|
|
|
|
conn.execute(
|
|
"CREATE TABLE person (
|
|
id INTEGER PRIMARY KEY,
|
|
name TEXT NOT NULL,
|
|
time_created TEXT NOT NULL,
|
|
data BLOB
|
|
)",
|
|
params![],
|
|
)?;
|
|
let me = Person {
|
|
id: 0,
|
|
name: "Steven".to_string(),
|
|
time_created: time::get_time(),
|
|
data: None,
|
|
};
|
|
conn.execute(
|
|
"INSERT INTO person (name, time_created, data)
|
|
VALUES (?1, ?2, ?3)",
|
|
params![me.name, me.time_created, me.data],
|
|
)?;
|
|
|
|
let mut stmt = conn.prepare("SELECT id, name, time_created, data FROM person")?;
|
|
let person_iter = stmt.query_map(params![], |row| {
|
|
Ok(Person {
|
|
id: row.get(0)?,
|
|
name: row.get(1)?,
|
|
time_created: row.get(2)?,
|
|
data: row.get(3)?,
|
|
})
|
|
})?;
|
|
|
|
for person in person_iter {
|
|
println!("Found person {:?}", person.unwrap());
|
|
}
|
|
Ok(())
|
|
}
|
|
```
|
|
|
|
### Supported SQLite Versions
|
|
|
|
The base `rusqlite` package supports SQLite version 3.6.8 or newer. If you need
|
|
support for older versions, please file an issue. Some cargo features require a
|
|
newer SQLite version; see details below.
|
|
|
|
### Optional Features
|
|
|
|
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/rusqlite/struct.LoadExtensionGuard.html)
|
|
allows loading dynamic library-based SQLite extensions.
|
|
* [`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/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/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/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/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/rusqlite/types/trait.FromSql.html)
|
|
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/rusqlite/types/trait.FromSql.html)
|
|
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.
|
|
* `unlock_notify` for [Unlock](https://sqlite.org/unlock_notify.html) notification.
|
|
* `vtab` for [virtual table](https://sqlite.org/vtab.html) support (allows you to write virtual table implemntations in Rust). Currently, only read-only virtual tables are supported.
|
|
* [`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
|
|
|
|
`libsqlite3-sys` is a separate crate from `rusqlite` that provides the Rust
|
|
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
|
|
[Vcpkg](https://github.com/Microsoft/vcpkg) installation for MSVC ABI builds.
|
|
|
|
You can adjust this behavior in a number of ways:
|
|
|
|
* If you use the `bundled` feature, `libsqlite3-sys` will use the
|
|
[cc](https://crates.io/crates/cc) crate to compile SQLite from source and
|
|
link against that. This source is embedded in the `libsqlite3-sys` crate and
|
|
is currently SQLite 3.29.0 (as of `rusqlite` 0.20.0 / `libsqlite3-sys`
|
|
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 = "0.20.0"
|
|
features = ["bundled"]
|
|
```
|
|
* You can set the `SQLITE3_LIB_DIR` to point to directory containing the SQLite
|
|
library.
|
|
* 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,
|
|
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
|
|
declarations from SQLite's C header file. `bindgen`
|
|
[recommends](https://github.com/servo/rust-bindgen#library-usage-with-buildrs)
|
|
running this as part of the build process of libraries that used this. We tried
|
|
this briefly (`rusqlite` 0.10.0, specifically), but it had some annoyances:
|
|
|
|
* The build time for `libsqlite3-sys` (and therefore `rusqlite`) increased
|
|
dramatically.
|
|
* Running `bindgen` requires a relatively-recent version of Clang, which many
|
|
systems do not have installed by default.
|
|
* Running `bindgen` also requires the SQLite header file to be present.
|
|
|
|
As of `rusqlite` 0.10.1, we avoid running `bindgen` at build-time by shipping
|
|
pregenerated bindings for several versions of SQLite. When compiling
|
|
`rusqlite`, we use your selected Cargo features to pick the bindings for the
|
|
minimum SQLite version that supports your chosen features. If you are using
|
|
`libsqlite3-sys` directly, you can use the same features to choose which
|
|
pregenerated bindings are chosen:
|
|
|
|
* `min_sqlite_version_3_6_8` - SQLite 3.6.8 bindings (this is the default)
|
|
* `min_sqlite_version_3_6_23` - SQLite 3.6.23 bindings
|
|
* `min_sqlite_version_3_7_7` - SQLite 3.7.7 bindings
|
|
|
|
If you use the `bundled` feature, you will get pregenerated bindings for the
|
|
bundled version of SQLite. If you need other specific pregenerated binding
|
|
versions, please file an issue. If you want to run `bindgen` at buildtime to
|
|
produce your own bindings, use the `buildtime_bindgen` Cargo feature.
|
|
|
|
## Author
|
|
|
|
John Gallagher, johnkgallagher@gmail.com
|
|
|
|
## License
|
|
|
|
Rusqlite is available under the MIT license. See the LICENSE file for more info.
|