Contoh ON DELETE CASCADE

deletecascade.txt

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

D:\xampp\mysql\bin>mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.16 MySQL Community Server (GPL)

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test
Database changed

mysql> -- create tabel master
mysql> -- ---------------------------

mysql> create table tbl_master (
    ->   id int auto_increment,
    ->   name varchar(100) null,
    ->   primary key (id)
    -> );
Query OK, 0 rows affected (0.17 sec)

mysql> -- create tabel details
mysql> -- ---------------------------

mysql> create table tbl_details (
    ->   id int auto_increment,
    ->   master_id int not null,
    ->   name varchar(100) null,
    ->   primary key (id),
    ->   foreign key (master_id)
    ->           references tbl_master (id) on delete cascade
    -> );
Query OK, 0 rows affected (0.17 sec)

mysql> -- insert data ke tabel master
mysql> -- ---------------------------

mysql> insert into tbl_master (name)
    -> select 'Amir' union all
    -> select 'Budi' ;
Query OK, 2 rows affected (0.04 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> select * from tbl_master;
+----+------+
| id | name |
+----+------+
|  1 | Amir |
|  2 | Budi |
+----+------+
2 rows in set (0.00 sec)

mysql> -- insert data ke tabel details
mysql> -- ---------------------------
mysql> insert into tbl_details (master_id, name)
    -> select 1, 'Anak pertama Amir' union all
    -> select 1, 'Anak kedua Amir' union all
    -> select 1, 'Anak ketiga Amir' union all
    -> select 2, 'Anak pertama Budi' union all
    -> select 2, 'Anak kedua Budi' ;
Query OK, 5 rows affected (0.03 sec)
Records: 5  Duplicates: 0  Warnings: 0

mysql> select * from tbl_details;
+----+-----------+-------------------+
| id | master_id | name              |
+----+-----------+-------------------+
|  1 |         1 | Anak pertama Amir |
|  2 |         1 | Anak kedua Amir   |
|  3 |         1 | Anak ketiga Amir  |
|  4 |         2 | Anak pertama Budi |
|  5 |         2 | Anak kedua Budi   |
+----+-----------+-------------------+
5 rows in set (0.00 sec)

mysql> -- sekarang coba kita hapus 'Amir' dari master
mysql> -- -------------------------------------------
mysql> delete from tbl_master
    -> where name = 'Amir' ;
Query OK, 1 row affected (0.03 sec)

mysql> select * from tbl_master;
+----+------+
| id | name |
+----+------+
|  2 | Budi |
+----+------+
1 row in set (0.00 sec)

mysql> -- terlihat row 'Amir' sudah terhapus
mysql> -- sekarang kita lihat apakah anak2nya 'Amir' ikut terhapus
mysql> -- --------------------------------------------------------
mysql> select * from tbl_details;
+----+-----------+-------------------+
| id | master_id | name              |
+----+-----------+-------------------+
|  4 |         2 | Anak pertama Budi |
|  5 |         2 | Anak kedua Budi   |
+----+-----------+-------------------+
2 rows in set (0.00 sec)

mysql> -- YES !!!
mysql> -- -------
mysql>