mysql中，怎么用触发器同步两个表？

首先，建立要用于测试的 数据库 与 表。

create database a

create database b

use a

create table table1(id int, val int)

use b

create table table2(id int, val int)

然后建触发器

use a

DELIMITER //

CREATE TRIGGER tr_Insert_t1

AFTER INSERT ON table1

FOR EACH ROW

BEGIN

-- 检查当前 环境，避免递归.

IF @disable_trigger IS NULL THEN

-- 设置禁用触发器标志.

SET @disable_trigger = 1

-- 插入目标表

INSERT INTO

b.table2

VALUES

(new.id, new.val)

-- 恢复禁用触发器标志.

SET @disable_trigger = NULL

END IF

END

//

DELIMITER

use b

DELIMITER //

CREATE TRIGGER tr_Insert_t2

AFTER INSERT ON table2

FOR EACH ROW

BEGIN

-- 检查当前 环境，避免递归.

IF @disable_trigger IS NULL THEN

-- 设置禁用触发器标志.

SET @disable_trigger = 1

-- 插入目标表

INSERT INTO

a.table1

VALUES

(new.id, new.val)

-- 恢复禁用触发器标志.

SET @disable_trigger = NULL

END IF

END

//

DELIMITER

测试执行效果：

mysql>use b

Database changed

mysql>insert into table2 values(2,2)

Query OK, 1 row affected (0.01 sec)

mysql>use a

Database changed

mysql>insert into table1 values (1, 1)

Query OK, 1 row affected (0.00 sec)

mysql>select * from table1

+------+------+

| id | val |

+------+------+

|2 |2 |

|1 |1 |

+------+------+

2 rows in set (0.00 sec)

mysql>select * from b.table2

+------+------+

| id | val |

+------+------+

|2 |2 |

|1 |1 |

+------+------+

2 rows in set (0.00 sec)

insert into table1 values(数据) insert into table2 values(数据) insert into table3 values(数据) 一起提交就是多个表同时添加

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