MySQL事件调度器_MySQL

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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_nameON SCHEDULE schedule [ON COMPLETION [NOT] PRESERVE][ENABLE | DISABLE][COMMENT 'comment']DO sql_statement;

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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：

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;-- 或SET GLOBAL event_scheduler = ON;/*关闭*/SET GLOBAL event_scheduler = 0;-- 或SET GLOBAL event_scheduler = OFF; 

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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

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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);

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查看事件调度器：

/*查看EVENT*/   show events;-- 或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_TestEventON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 DAYDO CALL msp_TestEvent();

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2014-02-28日执行调度器：

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

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每天执行调度器：

/*每天执行调度器*/    CREATE EVENT e_TestEventON SCHEDULE EVERY 1 DAYDO CALL msp_TestEvent();

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一天后每天执行调度器：

/*一天后每天执行调度器*/    CREATE EVENT e_TestEventON SCHEDULE EVERY 1 DAYSTARTS CURRENT_TIMESTAMP + INTERVAL 2 DAYDO CALL msp_TestEvent(); 

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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_TestEventON SCHEDULE EVERY 1 DAYENDS CURRENT_TIMESTAMP + INTERVAL 10 DAYDO CALL msp_TestEvent(); 

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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_TestEventON SCHEDULE EVERY 1 DAYSTARTS CURRENT_TIMESTAMP + INTERVAL 1 DAYENDS CURRENT_TIMESTAMP + INTERVAL 10 MONTHDO CALL msp_TestEvent();

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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_TestEventON SCHEDULE EVERY 1 DAYON COMPLETION NOT PRESERVEDO CALL msp_TestEvent(); 

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5.删除调度器：

DROP EVENT [IF EXISTS] event_name

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