MySQL5.7新特性之单表支撑多个DML触发器

MySQL5.6不支持一个表有多个UPDATE/DELETE/INSERT触发器。

下边看一个例子：

创建三个测试表：

mysql> create table t_trig_test_01 (name varchar(10));

Query OK, 0 rows affected (0.07 sec)

mysql> create table t_trig_test_02 (name varchar(10));

Query OK, 0 rows affected (0.03 sec)

mysql> create table t_trig_test_03 (name varchar(10));

Query OK, 0 rows affected (0.03 sec)

创建两个触发器：

mysql> delimiter //

mysql> create trigger trg_test_01

    -> after insert on t_trig_test_01

    -> for each row

    -> begin

    -> insert into t_trig_test_02 select * from t_trig_test_01;

    -> end;

    -> //

Query OK, 0 rows affected (0.06 sec)

mysql> delimiter //

mysql> create trigger trg_test_02

    -> after insert on t_trig_test_01

    -> for each row

    -> begin

    -> insert into t_trig_test_03 select * from t_trig_test_01;

    -> end;

    -> //

Query OK, 0 rows affected (0.11 sec)

向表t_trig_test_01插入两条测试数据：

mysql> insert into t_trig_test_01 values('steven');

Query OK, 1 row affected (0.01 sec)

mysql> insert into t_trig_test_01 values('steven');

Query OK, 1 row affected (0.01 sec)

查看三个表的数据：

mysql> select * from t_trig_test_01;

+--------+

| name |

+--------+

| steven |

| steven |

+--------+

2 rows in set (0.00 sec)

mysql> select * from t_trig_test_02;

+--------+

| name |

+--------+

| steven |

| steven |

| steven |

+--------+

3 rows in set (0.00 sec)

mysql> select * from t_trig_test_03;

+--------+

| name |

+--------+

| steven |

| steven |

| steven |

+--------+

3 rows in set (0.00 sec)

达到了预期的结果。