MySQL事件调度器

MySQL 5.1 中新增了事件调度器这一个功能。可以实现类似于SQL Server的Job功能。

1.语法

CREATE EVENT [IF NOT EXISTS] event_name
ON SCHEDULE schedule 
[ON COMPLETION [NOT] PRESERVE]
[ENABLE | DISABLE]
[COMMENT 'comment']
DO sql_statement;
View Code

其中schedule的语句可以表示为:

AT TIMESTAMP [+ INTERVAL]
| EVERY INTERVAL [STARTS TIMESTAMP] [ENDS TIMESTAMP]
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interval的单位可以有如下几种:

YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE |
WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE | DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND
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2.开启、关闭事件调度器

查询event_scheduler是否开启.

SHOW VARIABLES LIKE 'event_scheduler';
或
SELECT @@event_scheduler;
或
SHOW PROCESSLIST;
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在使用这个功能之前必须确保event_scheduler已开启.

/*开启*/
SET GLOBAL event_scheduler = 1;
--
SET GLOBAL event_scheduler = ON;

/*关闭*/
SET GLOBAL event_scheduler = 0;
--
SET GLOBAL event_scheduler = OFF; 
View Code

3.示例

创建测试数据库:

CREATE TABLE tst_event (createtime DATETIME);
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创建测试用存储过程:

/*
创建测试用存储过程
*/
CREATE PROCEDURE msp_TestEvent()
BEGIN
    INSERT INTO tst_event VALUES (CURRENT_TIMESTAMP);
END
View Code

创建事件调度器:

CREATE EVENT IF NOT EXISTS me_TestEvent
    ON SCHEDULE EVERY 10 SECOND 
    STARTS '2014-02-28 16:45:00' ENDS DATE_ADD('2014-02-28 16:46:00',INTERVAL 1 SECOND)
    DO CALL msp_TestEvent();
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修改事件调度器:

/*
修改EVENT
*/ 
ALTER EVENT me_TestEvent
    ON SCHEDULE EVERY 10 SECOND 
    STARTS '2014-02-27 16:45:00' ENDS DATE_ADD('2014-02-27 16:46:00',INTERVAL 1 SECOND)
    DO INSERT INTO tst_event VALUES (CURRENT_TIMESTAMP);
View Code

查看事件调度器:

/*
查看EVENT
*/   
show events;
--
select * from information_schema.events 
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4.不同时间间隔的调度: 

一天后执行调度器:

/*
一天后执行调度器T
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 DAY
DO CALL msp_TestEvent();
View Code

2014-02-28日执行调度器:

/*
2014-02-28日执行调度器
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE AT TIMESTAMP '2014-02-28 00:00:00'
DO CALL msp_TestEvent();
View Code

每天执行调度器:

/*
每天执行调度器
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE EVERY 1 DAY
DO CALL msp_TestEvent();
View Code

一天后每天执行调度器:

/*
一天后每天执行调度器
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE EVERY 1 DAY
STARTS CURRENT_TIMESTAMP + INTERVAL 2 DAY
DO CALL msp_TestEvent(); 
View Code

每天执行调度器,10天后停止:

/*
每天执行调度器,10天后停止
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE EVERY 1 DAY
ENDS CURRENT_TIMESTAMP + INTERVAL 10 DAY
DO CALL msp_TestEvent(); 
View Code

一天后开始,每天执行调度器,10天后停止:

/*
一天后开始,每天执行调度器,10天后停止
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE EVERY 1 DAY
STARTS CURRENT_TIMESTAMP + INTERVAL 1 DAY
ENDS CURRENT_TIMESTAMP + INTERVAL 10 MONTH
DO CALL msp_TestEvent();
View Code

每天执行调度器,只执行一次:

/*
每天执行调度器,只执行一次
*/    
CREATE EVENT e_TestEvent
ON SCHEDULE EVERY 1 DAY
ON COMPLETION NOT PRESERVE
DO CALL msp_TestEvent(); 
View Code

5.删除调度器

DROP EVENT [IF EXISTS] event_name
View Code
posted @ 2014-02-28 13:02  航行  阅读(1643)  评论(2编辑  收藏  举报