SQL Builder

The library bases on two ideas:

• an SQL statement expressed with this library should be similar to the statement itself;
• flexible combination of statement components.

Thus, using this library you get simple but, at the same time, powerful tool to build SQL statements in flexible and intuitive way.

package main

import (
	"fmt"
	"github.com/AlephTav/sqb"
	sql "github.com/AlephTav/sqb/postgresql"
)

func main() {
	st := sql.NewSelectStmt(NewStatementExecutor()).
		Select(sqb.Map(
			"", "u.id",
			"", "u.name",
			"company", "c.name",
			"unreadMessageCount", sql.NewSelectStmt(nil).
				Select("COUNT(*)").
				From("user_messages", "m").
				Where("m.user_id = u.id").
				AndWhere("m.read_at IS NULL"),
		)).
		From("users u").
		InnerJoin("companies c", "c.id = u.company_id").
		Where("u.deleted_at IS NULL").
		AndWhere(sql.NewCondExp().
			Where("u.roles", "IN", []any{"ADMIN", "RESELLER"}).
			OrWhere(
				sql.NewSelectStmt(nil).
					Select("COUNT(*)").
					From("user_contacts uc").
					Where("uc.user_id = u.id"),
				">",
				5,
			))

	// Outputs: 
	// SELECT
	//     u.id, u.name, c.name company,
	//     (SELECT COUNT(*) FROM user_messages m WHERE m.user_id = u.id AND m.read_at IS NULL) unreadMessageCount
	// FROM users u
	// INNER JOIN companies c ON c.id = u.company_id
	// WHERE
	//     u.deleted_at IS NULL AND (
	//         u.roles IN (:p1, :p2) OR 
	//         (SELECT COUNT(*) FROM user_contacts uc WHERE uc.user_id = u.id) > :p3
	//     )
	fmt.Println(st.String())

	// Outputs:
	// map[string]any{"p1": "ADMIN", "p2": "RESELLER", "p3": 5}
	fmt.Printf("%#v", st.Params())

	// Executes statement if StatementExecutor is defined, otherwise it panics
	rows, err := st.Rows()
}

Installation

go install github.com/AlephTav/sqb