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mysql-定时任务

mysql 定时任务从5.1版本开始引入,又叫做临时触发器,但是与普通触发器不同的是,普通触发器是通过操作数据表的每行数据而触发的事件,而它是通过时间点或者时间周期触发

先来看一下它的语法:

DELIMITER $$-- SET GLOBAL event_scheduler = ON$$     -- required for event to execute but not create    CREATE    /*[DEFINER = { user | CURRENT_USER }]*/    EVENT   `event1`ON SCHEDULE     /* uncomment the example below you want to use */    -- scheduleexample 1: run once       --  AT ‘YYYY-MM-DD HH:MM.SS‘/CURRENT_TIMESTAMP { + INTERVAL 1 [HOUR|MONTH|WEEK|DAY|MINUTE|...] }    -- scheduleexample 2: run at intervals forever after creation       -- EVERY 1 [HOUR|MONTH|WEEK|DAY|MINUTE|...]    -- scheduleexample 3: specified start time, end time and interval for execution       /*EVERY 1  [HOUR|MONTH|WEEK|DAY|MINUTE|...]       STARTS CURRENT_TIMESTAMP/‘YYYY-MM-DD HH:MM.SS‘ { + INTERVAL 1[HOUR|MONTH|WEEK|DAY|MINUTE|...] }       ENDS CURRENT_TIMESTAMP/‘YYYY-MM-DD HH:MM.SS‘ { + INTERVAL 1 [HOUR|MONTH|WEEK|DAY|MINUTE|...] } *//*[ON COMPLETION [NOT] PRESERVE][ENABLE | DISABLE][COMMENT ‘comment‘]*/DO    BEGIN        (sql_statements)    END$$DELIMITER ;

基本上通过上面的语法说明已经了解到如何使用了,下面针对每种方式可以再写个小栗子

1,在某个时间点触发(执行一次):

DELIMITER $$CREATE     EVENT `bdhp`.`e_e1`ON SCHEDULE        /*只执行一次*/        /*AT ‘2015-02-03 16:07.00‘*//*某一时间点*/           /* AT ‘2015-02-03 16:47.20‘ + INTERVAL 40 second*//*某一时间点 + 一段时间*/                 AT CURRENT_TIMESTAMP+ INTERVAL 40 SECOND/*当前时间点 + 一段时间*/        DO    BEGIN        INSERT INTO t_sys_log(sn)VALUES(55555);    END$$DELIMITER ;

2,按周期执行,无限次数

DELIMITER $$CREATE     EVENT `e_e2`ON SCHEDULE           EVERY 1 MINUTEDO    BEGIN        INSERT INTO t_sys_log(sn)VALUES(55555);    END$$DELIMITER ;

3,在某一时间段内,按周期执行(ends 不写则表示从某一时间点开始执行)

DELIMITER $$CREATE     EVENT `e_e3`ON SCHEDULE    EVERY 1  SECOND       STARTS CURRENT_TIMESTAMP       ENDS 2015-02-03 16:15.00DO    BEGIN        INSERT INTO t_sys_log(sn,USER_NAME)VALUES(test,ttt-55);    END$$DELIMITER ;

 

mysql-定时任务