mysql定时任务案例以及教程
SHOW VARIABLES LIKE ‘event_scheduler’;
Value为ON则已打开，OFF则关闭
如果是OFF，就先打开：
SET GLOBAL event_scheduler = ON;
然后创建我们想要的定时器
每天凌晨一点执行（清空表数据）
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 1 DAY STARTS DATE_ADD(DATE_ADD(CURDATE(), INTERVAL 1 DAY), INTERVAL 1 HOUR)
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每分钟执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 1 MINUTE
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每个小时执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 1 HOUR
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每隔三天执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 3 DAY STARTS NOW()
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每个月的五号一点执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 5 MONTH STARTS DATE_ADD(DATE_ADD(DATE_SUB(CURDATE(),INTERVAL DAY(CURDATE())-1 DAY), INTERVAL 1 MONTH),INTERVAL 1 HOUR)
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每个季度三号两点执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 3 QUARTER STARTS DATE_ADD(DATE_ADD(DATE( CONCAT(YEAR(CURDATE()),'-',ELT(QUARTER(CURDATE()),1,4,7,10),'-',1)),INTERVAL 1 QUARTER),INTERVAL 2 HOUR)
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
每年一月一号凌晨三点执行一次
DELIMITER $$
DROP EVENT IF EXISTS deletefol_bigorders_rfm;
CREATE EVENT deletefol_bigorders_rfm
ON SCHEDULE EVERY 1 YEAR STARTS DATE_ADD(DATE(CONCAT(YEAR(CURDATE()) + 1,'-',1,'-',1)),INTERVAL 3 HOUR)
ON COMPLETION PRESERVE
DO BEGIN
delete from fol_bigorders_rfm;
END$$
DELIMITER ;
创建完成后，查看定时器
select * from deletefol_bigorders_rfm.event;
关闭定时任务
DROP event deletefol_bigorders_rfm.event;
临时关闭事件
ALTER EVENT deletefol_bigorders_rfm.event DISABLE;
开启事件
ALTER EVENT deletefol_bigorders_rfm.event ENABLE;
删除事件
DROP EVENT [IF EXISTS] deletefol_bigorders_rfm.event;
重命名事件并加上备注
ALTER EVENT deletefol_bigorders_rfm.event RENAME TO deletefol_bigorders_rfm_new COMMENT '重命名事件';
查看事件的创建SQL语句
SHOW CREATE EVENT deletefol_bigorders_rfm.event;