sqlbuilder/delete_test.go

// Copyright 2018 Huan Du. All rights reserved.
// Licensed under the MIT license that can be found in the LICENSE file.

package sqlbuilder

import (
	"fmt"
)

func ExampleDeleteFrom() {
	sql := DeleteFrom("demo.user").
		Where(
			"status = 1",
		).
		Limit(10).
		String()

	fmt.Println(sql)

	// Output:
	// DELETE FROM demo.user WHERE status = 1 LIMIT 10
}

func ExampleDeleteBuilder() {
	db := NewDeleteBuilder()
	db.DeleteFrom("demo.user")
	db.Where(
		db.GreaterThan("id", 1234),
		db.Like("name", "%Du"),
		db.Or(
			db.IsNull("id_card"),
			db.In("status", 1, 2, 5),
		),
		"modified_at > created_at + "+db.Var(86400), // It's allowed to write arbitrary SQL.
	)

	sql, args := db.Build()
	fmt.Println(sql)
	fmt.Println(args)

	// Output:
	// DELETE FROM demo.user WHERE id > ? AND name LIKE ? AND (id_card IS NULL OR status IN (?, ?, ?)) AND modified_at > created_at + ?
	// [1234 %Du 1 2 5 86400]
}

func ExampleDeleteBuilder_SQL() {
	db := NewDeleteBuilder()
	db.SQL(`/* before */`)
	db.DeleteFrom("demo.user")
	db.SQL("PARTITION (p0)")
	db.Where(
		db.GreaterThan("id", 1234),
	)
	db.SQL("/* after where */")
	db.OrderBy("id")
	db.SQL("/* after order by */")
	db.Limit(10)
	db.SQL("/* after limit */")

	sql, args := db.Build()
	fmt.Println(sql)
	fmt.Println(args)

	// Output:
	// /* before */ DELETE FROM demo.user PARTITION (p0) WHERE id > ? /* after where */ ORDER BY id /* after order by */ LIMIT 10 /* after limit */
	// [1234]
}

func ExampleDeleteBuilder_With() {
	sql := With(
		CTEQuery("users").As(
			Select("id", "name").From("users").Where("name IS NULL"),
		),
	).DeleteFrom("orders").Where(
		"users.id = orders.user_id",
	).String()

	fmt.Println(sql)

	// Output:
	// WITH users AS (SELECT id, name FROM users WHERE name IS NULL) DELETE FROM orders WHERE users.id = orders.user_id
}