Crate libsql

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§libSQL API for Rust

libSQL is an embeddable SQL database engine based on SQLite. This Rust API is a batteries-included wrapper around the SQLite C API to support transparent replication while retaining compatibility with the SQLite ecosystem, such as the SQL dialect and extensions. If you are building an application in Rust, this is the crate you should use. There are also libSQL language bindings of this Rust crate to other languages such as JavaScript, Python, Go, and C.

§Getting Started

To get started, you first need to create a Database object and then open a Connection to it, which you use to query:

use libsql::Builder;

let db = Builder::new_local(":memory:").build().await.unwrap();
let conn = db.connect().unwrap();
conn.execute("CREATE TABLE IF NOT EXISTS users (email TEXT)", ()).await.unwrap();
conn.execute("INSERT INTO users (email) VALUES ('alice@example.org')", ()).await.unwrap();

§Embedded Replicas

Embedded replica is libSQL database that’s running in your application process, which keeps a local copy of a remote database. They are useful if you want to move data in the memory space of your application for fast access.

You can open an embedded read-only replica by using the Database::open_with_local_sync constructor:

use libsql::Builder;
use libsql::replication::Frames;

let mut db = Builder::new_local_replica("/tmp/test.db").build().await.unwrap();

let frames = Frames::Vec(vec![]);
db.sync_frames(frames).await.unwrap();
let conn = db.connect().unwrap();
conn.execute("SELECT * FROM users", ()).await.unwrap();

§Remote database

It is also possible to create a libsql connection that does not open a local datatbase but instead sends queries to a remote database.

use libsql::Builder;

let db = Builder::new_remote("libsql://my-remote-db.com", "my-auth-token").build().await.unwrap();
let conn = db.connect().unwrap();
conn.execute("CREATE TABLE IF NOT EXISTS users (email TEXT)", ()).await.unwrap();
conn.execute("INSERT INTO users (email) VALUES ('alice@example.org')", ()).await.unwrap();

§WASM

Due to WASM requiring !Send support and the Database type supporting async and using async_trait to abstract between the different database types, we are unable to support WASM via the Database type. Instead, we have provided simpler parallel types in the wasm module that provide access to our remote HTTP protocol in WASM.

§Examples

You can find more examples in the examples directory.

§Feature flags

This crate provides a few feature flags that will help you improve compile times by allowing you to reduce the dependencies needed to compile specific features of this crate. For example, you may not want to compile the libsql C code if you just want to make HTTP requests. Feature flags may be used by including the libsql crate like:

libsql = { version = "*", default-features = false, features = ["core", "replication", "remote" ]

By default, all the features are enabled but by providing default-features = false it will remove those defaults.

The features are descirbed like so:

  • core this includes the core C code that backs both the basic local database usage and embedded replica features.
  • replication this feature flag includes the core feature flag and adds on top HTTP code that will allow you to sync you remote database locally.
  • remote this feature flag only includes HTTP code that will allow you to run queries against a remote database.

Re-exports§

Modules§

  • Deserialization utilities.
  • fficore
    C ffi for libsql.
  • This module contains all Param related utilities and traits.
  • replicationreplication
    Utilities used when using a replicated version of libsql.

Macros§

  • Construct named params from a hetergeneous set of params types.
  • Construct positional params from a hetergeneous set of params types.

Structs§

Enums§

Functions§

  • Return the version of the underlying SQLite library as a string.
  • Return the version of the underlying SQLite library as a number.

Type Aliases§

  • Convenient alias for Result using the libsql::Error type.