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#16 in Database interfaces

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MIT license

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Rusqlcipher

Travis Build Status AppVeyor Build Status dependency status Latest Version

Rusqlcipher is an ergonomic wrapper for using SQLCipher from Rust. It attempts to expose an interface similar to rust-postgres. View the full API documentation.

extern crate rusqlcipher;
extern crate time;

use time::Timespec;
use rusqlcipher::Connection;

#[derive(Debug)]
struct Person {
    id: i32,
    name: String,
    time_created: Timespec,
    data: Option<Vec<u8>>
}

fn main() {
    let conn = Connection::open_in_memory().unwrap();

    conn.execute("CREATE TABLE person (
                  id              INTEGER PRIMARY KEY,
                  name            TEXT NOT NULL,
                  time_created    TEXT NOT NULL,
                  data            BLOB
                  )", &[]).unwrap();
    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)",
                 &[&me.name, &me.time_created, &me.data]).unwrap();

    let mut stmt = conn.prepare("SELECT id, name, time_created, data FROM person").unwrap();
    let person_iter = stmt.query_map(&[], |row| {
        Person {
            id: row.get(0),
            name: row.get(1),
            time_created: row.get(2),
            data: row.get(3)
        }
    }).unwrap();

    for person in person_iter {
        println!("Found person {:?}", person.unwrap());
    }
}

SQLCipher

This work is based on rusqlite and SQLCipher. This package has precompiled SQLCipher to use OpenSSL 1.1.0 or newer and replaces the following three files in libsqlcipher-sys/sqlite3/: sqlite3.c, sqlite3.h, sqlite3ext.h. See openssl-sys for information on compiling openssl. SQLCipher has been modified to use HMAC-SHA256 instead of the default HMAC-SHA1.

Supported SQLite Versions

The base rusqlcipher 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. They are:

  • load_extension allows loading dynamic library-based SQLite3 extensions.
  • backup allows use of SQLite's online backup API. Note: This feature requires SQLite 3.6.11 or later.
  • functions allows you to load Rust closures into SQLite connections for use in queries. Note: This feature requires SQLite 3.7.3 or later.
  • trace allows hooks into SQLite's tracing and profiling APIs. Note: This feature requires SQLite 3.6.23 or later.
  • blob gives std::io::{Read, Write, Seek} access to SQL BLOBs. Note: This feature requires SQLite 3.7.4 or later.
  • limits allows you to set and retrieve SQLite's per connection limits.
  • chrono implements FromSql and ToSql for various types from the chrono crate.
  • serde_json implements FromSql and ToSql for the Value type from the serde_json crate.
  • 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.

Notes on building rusqlcipher and libsqlcipher-sys

libsqlcipher-sys is a separate crate from rusqlcipher that provides the Rust declarations for SQLite's C API. By default, libsqlcipher-sys attempts to find a SQLite library that already exists on your system using pkg-config, or a Vcpkg installation for MSVC ABI builds. rusqlcipher also depends on OpenSSL version 1.1.0 or above.

You can adjust this behavior in a number of ways:

  • If you use the bundled feature, libsqlcipher-sys will use the gcc crate to compile SQLite from source and link against that. This source is embedded in the libsqlcipher-sys crate and is currently SQLite 3.15.2 (as of rusqlcipher 0.10.1 / libsqlcipher-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:
    [dependencies.rusqlcipher]
    version = "0.11.0"
    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 and vcpkg have some additional configuration options. The default when using vcpkg is to dynamically link. vcpkg install sqlite3:x64-windows will install the required library.

Binding generation

We use bindgen to generate the Rust declarations from SQLite's C header file. bindgen recommends running this as part of the build process of libraries that used this. We tried this briefly (rusqlcipher 0.10.0, specifically), but it had some annoyances:

  • The build time for libsqlcipher-sys (and therefore rusqlcipher) 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 rusqlcipher 0.1.0, we avoid running bindgen at build-time by shipping pregenerated bindings for several versions of SQLite. When compiling rusqlcipher, we use your selected Cargo features to pick the bindings for the minimum SQLite version that supports your chosen features. If you are using libsqlcipher-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_11 - SQLite 3.6.11 bindings
  • min_sqlite_version_3_6_23 - SQLite 3.6.23 bindings
  • min_sqlite_version_3_7_3 - SQLite 3.7.3 bindings
  • min_sqlite_version_3_7_4 - SQLite 3.7.4 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

Michael Lodder, redmike7@gmail.com

Original Author

John Gallagher, johnkgallagher@gmail.com

License

Rusqlcipher is available under the Apache Version 2 license. See the LICENSE file for more info. Rusqlite is available under the MIT license. See the ORIGLICENSE file for more info.

Dependencies