用mysql触发器实现log记录

首先建立两张测试用表

mysql> desc pay;
+-------+---------------+------+-----+---------+----------------+
| Field | Type          | Null | Key | Default | Extra          |
+-------+---------------+------+-----+---------+----------------+
| id    | int()       | NO   | PRI | NULL    | auto_increment |
| money | decimal(,) | NO   |     | NULL    |                |
| op    | char()      | YES  |     | NULL    |                |
+-------+---------------+------+-----+---------+----------------+
 rows in set (0.00 sec)

mysql> desc log;
+-------------+-----------+------+-----+-------------------+-----------------------------+
| Field       | Type      | Null | Key | Default           | Extra                       |
+-------------+-----------+------+-----+-------------------+-----------------------------+
| id          | int()   | NO   | PRI | NULL              | auto_increment              |
| op          | char()  | YES  |     | NULL              |                             |
| oid         | int()   | NO   |     | NULL              |                             |
| last_update | timestamp | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
+-------------+-----------+------+-----+-------------------+-----------------------------+
 rows in set (0.00 sec)

创建一个触发器

mysql> delimiter $$
mysql> create trigger pay_log after insert on pay for each row begin insert into log set oid=new.id, op=new.op; end;$$
mysql> delimiter ;

参看触发器是否创建成功

mysql> show triggers\G;
*************************** . row ***************************
             Trigger: pay_log
               Event: INSERT
               Table: pay
           Statement: begin insert into log set oid=new.id, op=new.op; end
              Timing: AFTER
             Created: NULL
            sql_mode:
             Definer: root@localhost
character_set_client: latin1
collation_connection: latin1_swedish_ci
  Database Collation: utf8_general_ci
 row in set (0.00 sec)

ERROR:
No query specified

测试

mysql> insert into pay set money=,op='jimmy';
mysql> select * from pay;
+----+--------+-------+
| id | money  | op    |
+----+--------+-------+
|   | 123.00 | jimmy |
|   | 123.00 | jimmy |
+----+--------+-------+
 rows in set (0.00 sec)

mysql> select * from log;
+----+-------+-----+---------------------+
| id | op    | oid | last_update         |
+----+-------+-----+---------------------+
|   | jimmy |    | -- :: |
|   | jimmy |    | -- :: |
+----+-------+-----+---------------------+
 rows in set (0.00 sec)

同理还可以再创建一个update和delete的触发器

题外话

创建触发器的时候发现没有权限，启动参数加上--skip-grant-table解决