kkloberdanz / chai

Modern embedded SQL database

ChaiSQL

ChaiSQL is a modern embedded SQL database, focusing on flexibility and ease of use for developers.

Key Features

• PostgreSQL API: ChaiSQL SQL API is compatible with PostgreSQL
• Optimized for Go: Native Go implementation with no CGO dependency.
• Storage flexibility: Store data on-disk or in-memory.
• Solid foundations: ChaiSQL is backed by Pebble for native Go toolchains, and RocksDB for non-Go or CGO builds (coming soon).

Roadmap

ChaiSQL is work in progress and is not ready yet for production.

Here is a high level list of features that we want to implement in the near future, in no particular order:

• Stable storage format (90% completed)
• Implement most of the SQL-92 standard (detailed roadmap coming soon)
• Provide clients for other languages (JS/TS, Python, etc) and add support for RocksDB as the backend
• Compatibility with PostgreSQL drivers and ORMs

Installation

Install the ChaiSQL database

go install github.com/chaisql/chai

Quickstart

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/chaisql/chai"
)

func main() {
    // Create a database instance, here we'll store everything on-disk
    db, err := chai.Open("mydb")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    err = db.Exec(`
        CREATE TABLE user (
            id              INT         PRIMARY KEY,
            name            TEXT        NOT NULL UNIQUE,
            created_at      TIMESTAMP   NOT NULL
        )
    `)

    err = db.Exec(`INSERT INTO user (id, name, age) VALUES ($1, $2, $3)`, 20, "foo", 40)

    rows, err := db.Query("SELECT id, name, age, address FROM user WHERE age >= $1", 18)
    defer rows.Close()

    err = rows.Iterate(func(r *chai.Row) error {
        // scan each column
        var id, name, age
        err = r.Scan(&id, &name, &age)
        // or into a struct
        var u User
        err = r.StructScan(&u)
        // or even a map
        var m map[string]any
        err = r.MapScan(&m)
        return nil
    })
}

Checkout the Go doc and the usage example in the README to get started quickly.

In-memory database

For in-memory operations, simply use :memory::

db, err := chai.Open(":memory:")

Using database/sql

// import chai as a blank import
import _ "github.com/chaisql/chai/driver"

// Create a sql/database DB instance
db, err := sql.Open("chai", "mydb")
if err != nil {
    log.Fatal(err)
}
defer db.Close()

// Then use db as usual
res, err := db.ExecContext(...)
res, err := db.Query(...)
res, err := db.QueryRow(...)

// use the driver.Scanner to scan into a struct
var u User
err = res.Scan(driver.Scanner(&u))

chai shell

The chai command line provides an SQL shell for database management:

go install github.com/chaisql/chai/cmd/chai@latest

Usage example:

# For in-memory database:
chai

# For disk-based database:
chai dirName

Contributing

Contributions are welcome!

A big thanks to our contributors!

Made with contrib.rocks.

For any questions or discussions, open an issue.