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qb - the database toolkit for go

This project is currently pre 1.

Currently, it's not feature complete. It can have potential bugs. There are no tests covering concurrency race conditions. It can crash especially in concurrency. Before 1.x releases, each major release could break backwards compatibility.

About qb

qb is a database toolkit for easier db queries in go. It is inspired from python's best orm, namely sqlalchemy. qb is an orm(sqlx) as well as a query builder. It is quite modular in case of using just expression api and query building stuff.

Documentation

The documentation is hosted in readme.io which has great support for markdown docs. Currently, the docs are about 80% - 90% complete. The doc files will be added to this repo soon. Moreover, you can check the godoc from here. Contributions & Feedbacks in docs are welcome.

Features

Support for postgres(9.5.+), mysql & sqlite3
Powerful expression API for building queries & table ddls
Struct to table ddl mapper where initial table migrations can happen
Transactional session api that auto map structs to queries
Foreign key definitions
Single & Composite column indices
Relationships (soon.. probably in 0.3 milestone)

Installation

go get -u github.com/slicebit/qb

If you want to install test dependencies then;

go get -u -t github.com/slicebit/qb

Quick Start

package main

import (
	"fmt"
	"github.com/slicebit/qb"
	_ "github.com/mattn/go-sqlite3"
    _ "github.com/slicebit/qb/dialects/sqlite"
)

type User struct {
	ID       string `db:"id"`
	Email    string `db:"email"`
	FullName string `db:"full_name"`
	Oscars   int    `db:"oscars"`
}

func main() {

	users := qb.Table(
		"users",
		qb.Column("id", qb.Varchar().Size(40)),
		qb.Column("email", qb.Varchar()).NotNull().Unique(),
		qb.Column("full_name", qb.Varchar()).NotNull(),
		qb.Column("oscars", qb.Int()).NotNull().Default(0),
		qb.PrimaryKey("id"),
	)

	db, err := qb.New("sqlite3", "./qb_test.db")
	if err != nil {
		panic(err)
	}

	defer db.Close()

	metadata := qb.MetaData()

	// add table to metadata
	metadata.AddTable(users)

	// create all tables registered to metadata
	metadata.CreateAll(db)
	defer metadata.DropAll(db) // drops all tables

	ins := qb.Insert(users).Values(map[string]interface{}{
		"id":        "b6f8bfe3-a830-441a-a097-1777e6bfae95",
		"email":     "jack@nicholson.com",
		"full_name": "Jack Nicholson",
	})

	_, err = db.Exec(ins)
	if err != nil {
		panic(err)
	}

	// find user
	var user User

	sel := qb.Select(users.C("id"), users.C("email"), users.C("full_name")).
		From(users).
		Where(users.C("id").Eq("b6f8bfe3-a830-441a-a097-1777e6bfae95"))

	err = db.Get(sel, &user)
	fmt.Printf("%+v\n", user)
}