Perintah Trigger

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Acer>cd..

C:\Users>cd..

C:\>xampp\mysql\bin\mysql -u root -p
Enter password:
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Server version: 5.5.8 MySQL Community Server (GPL)

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mysql> create database toko_bintang;
Query OK, 1 row affected (0.00 sec)

mysql> use toko_bintang;
Database changed
mysql> create table jual(item char(21),jumlah int);
Query OK, 0 rows affected (0.14 sec)

mysql> create table stok(item char(21),stok int);
Query OK, 0 rows affected (0.17 sec)

mysql> select * from jual;
Empty set (0.00 sec)

mysql> select * from stok;
Empty set (0.00 sec)

mysql> insert into stok values('mie',150),('deterjen',100),('rokok',50);
Query OK, 3 rows affected (0.08 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> select * from stok;
+----------+------+
| item     | stok |
+----------+------+
| mie      |  150 |
| deterjen |  100 |
| rokok    |   50 |
+----------+------+
3 rows in set (0.00 sec)

mysql> delimiter $$
mysql> create trigger kurang_stok
    -> after insert on jual for each row
    -> begin
    -> update stok set stok=stok-new.jumlah where item=new.item;
    -> end$$
Query OK, 0 rows affected (0.16 sec)

mysql> delimiter ;
mysql> insert into jual values('mie',50),('deterjen',30),('rokok',20);
Query OK, 3 rows affected (0.09 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> select * from jual;
+----------+--------+
| item     | jumlah |
+----------+--------+
| mie      |     50 |
| deterjen |     30 |
| rokok    |     20 |
+----------+--------+
3 rows in set (0.00 sec)

mysql> select * from stok;
+----------+------+
| item     | stok |
+----------+------+
| mie      |  100 |
| deterjen |   70 |
| rokok    |   30 |
+----------+------+
3 rows in set (0.00 sec)

mysql> delimiter $$
mysql> create trigger tambah_stok
    -> after delete on jual for each row
    -> begin
    -> update stok set stok=stok+old.jumlah where item=old.item;
    -> end$$
Query OK, 0 rows affected (0.09 sec)

mysql> delimiter ;
mysql> select * from jual
    -> ;
+----------+--------+
| item     | jumlah |
+----------+--------+
| mie      |     50 |
| deterjen |     30 |
| rokok    |     20 |
+----------+--------+
3 rows in set (0.00 sec)

mysql> delete from jual where item+'rokok';
Query OK, 0 rows affected, 6 warnings (0.03 sec)

mysql> select * from jual;
+----------+--------+
| item     | jumlah |
+----------+--------+
| mie      |     50 |
| deterjen |     30 |
| rokok    |     20 |
+----------+--------+
3 rows in set (0.00 sec)

mysql> delete from jual where item='rokok';
Query OK, 1 row affected (0.08 sec)

mysql> select * from jual;
+----------+--------+
| item     | jumlah |
+----------+--------+
| mie      |     50 |
| deterjen |     30 |
+----------+--------+
2 rows in set (0.00 sec)

mysql> select * from stok;
+----------+------+
| item     | stok |
+----------+------+
| mie      |  100 |
| deterjen |   70 |
| rokok    |   50 |
+----------+------+
3 rows in set (0.00 sec)

mysql>