如何写mysql的定时任务

mysql的定时任务一般用event(事件)来完成，触发器无法完成。

一、通过mysql的命令行客户端来完成

1、set global event_scheduler =1//开启event_scheduler

执行这个语句如果出现，可在mysql的配置文档中设置[mysqld]段中添加 event_scheduler=ON

如果重启mysql；这种情况下依然出错，Error Code: 1290. The MySQL server is running with the --event-scheduler=DISABLED

or --skip-grant-tables option so it cannot execute this statement，这个错误是说启动服务器时如果指定了--skip-grant-tables选项，则event_scheduler则自动被设置为DISABLED。命令行或配置文件的设置都会被覆盖。建议重现安装mysql或是修改启动参数(在系统服务中指定)。

查看event_scheduler状态：show status like '%event%'或SELECT @@event_scheduler

2、CREATE PROCEDURE Mypro() //创建存储过程

BEGIN

update userinfo SET endtime = now() WHERE id = '155'

END

3、创建event My_enevt,每隔三十秒执行一次

create event if not exists e_test

on schedule every 30 second

on completion preserve

do call Mypro()

4、关闭事件

alter event e_test ON COMPLETION PRESERVE DISABLE

5、开启事件

alter event e_test ON COMPLETION PRESERVE ENABLE

语法：

CREATE EVENT [IF NOT EXISTS] event_name ON SCHEDULE schedule [ON COMPLETION

[NOT] PRESERVE] [ENABLE | DISABLE] [COMMENT 'comment'] DO sql_statement

schedule: AT TIMESTAMP [+ INTERVAL INTERVAL] | EVERY INTERVAL [STARTS TIMESTAMP]

[ENDS TIMESTAMP] INTERVAL: quantity {YEAR | QUARTER | MONTH | DAY | HOUR |

MINUTE | WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE | DAY_SECOND |

HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND}

mysql怎么让一个存储过程定时执行

查看event是否开启: show variables like '%sche%'

将事件计划开启: set global event_scheduler=1

关闭事件任务: alter event e_test ON COMPLETION PRESERVE DISABLE

开户事件任务: alter event e_test ON COMPLETION PRESERVE ENABLE

简单实例.

创建表 CREATE TABLE test(endtime DATETIME)

创建存储过程test

CREATE PROCEDURE test ()

BEGIN

update examinfo SET endtime = now() WHERE id = 14

END

创建event e_test

CREATE EVENT if not exists e_test

on schedule every 30 second

on completion preserve

do call test()

每隔30秒将执行存储过程test,将当前时间更新到examinfo表中id=14的记录的endtime字段中去

1) 首先来看一个简单的例子来演示每秒插入一条记录到数据表

USE test

CREATE TABLE aaa (timeline TIMESTAMP)

CREATE EVENT e_test_insert

ON SCHEDULE EVERY 1 SECOND

DO INSERT INTO test.aaa VALUES (CURRENT_TIMESTAMP)

等待3秒钟后，再执行查询看看：

mysql>SELECT * FROM aaa

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

| timeline|

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

| 2007-07-18 20:44:26 |

| 2007-07-18 20:44:27 |

| 2007-07-18 20:44:28 |

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

2) 5天后清空test表：

CREATE EVENT e_test

ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY

DO TRUNCATE TABLE test.aaa

3) 2007年7月20日12点整清空test表：

CREATE EVENT e_test

ON SCHEDULE AT TIMESTAMP '2007-07-20 12:00:00'

DO TRUNCATE TABLE test.aaa

4) 每天定时清空test表：

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

DO TRUNCATE TABLE test.aaa

5) 5天后开启每天定时清空test表：

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY

DO TRUNCATE TABLE test.aaa

6) 每天定时清空test表，5天后停止执行：

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY

DO TRUNCATE TABLE test.aaa

7) 5天后开启每天定时清空test表，一个月后停止执行：

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY

ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH

DO TRUNCATE TABLE test.aaa

[ON COMPLETION [NOT] PRESERVE]可以设置这个事件是执行一次还是持久执行，默认为NOT PRESERVE。

8) 每天定时清空test表(只执行一次，任务完成后就终止该事件)：

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

ON COMPLETION NOT PRESERVE

DO TRUNCATE TABLE test.aaa

[ENABLE | DISABLE]可是设置该事件创建后状态是否开启或关闭，默认为ENABLE。

[COMMENT ‘comment’]可以给该事件加上注释。

三、修改事件(ALTER EVENT)

ALTER EVENT event_name

[ON SCHEDULE schedule]

[RENAME TO new_event_name]

[ON COMPLETION [NOT] PRESERVE]

[COMMENT 'comment']

[ENABLE | DISABLE]

[DO sql_statement]

1) 临时关闭事件

ALTER EVENT e_test DISABLE

2) 开启事件

ALTER EVENT e_test ENABLE

3) 将每天清空test表改为5天清空一次：

ALTER EVENT e_test

ON SCHEDULE EVERY 5 DAY

四、删除事件(DROP EVENT)

语 法很简单，如下所示：

DROP EVENT [IF EXISTS] event_name

例如删除前面创建的e_test事件

DROP EVENT e_test

当然前提是这个事件存在，否则会产生ERROR 1513 (HY000): Unknown event错误，因此最好加上IF EXISTS

DROP EVENT IF EXISTS e_test

create event test

ON SCHEDULE AT '2007-09-01 12:00:00' + INTERVAL 1 DAY

on completion not preserve

do insert into yyy values('hhh','uuu')

解释：从2007-09-01开始，每天对表yyy在12：00：00进行一个插入 *** 作。而且只执行一次（on completion not preserve ）

我的计划任务为：

create event sysplan

ON SCHEDULE AT '2010-05-22 23:00:00' + INTERVAL 1 DAY

on completion not preserve

do truncate table bjproj.ae_tmp

三、通过设定全局变量event_scheduler 的值即可动态的控制事件调度器是否启用。

查看是否event_scheduler开启mysql>SHOW VARIABLES LIKE '%event%'

设置开启mysql>SET GLOBAL event_scheduler=ON

四、例子:

每分钟插入一条日志:DELIMITER //CREATE EVENT `user_log_event` ON SCHEDULE EVERY 1 MINUTE STARTS '2010-12-27 00:00:00' ON COMPLETION NOT PRESERVE ENABLE DO BEGIN INSERT INTO log SET addtime=NOW()END//

调用存储过程:DELIMITER //CREATE EVENT `user_log_event` ON SCHEDULE EVERY 1 DAY STARTS '2010-00-00 00:00:00' ON COMPLETION NOT PRESERVE ENABLE DO BEGINCALL user_log_prov()END//

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