1.首先先查看mysql是否开启定时任务开关
SHOW VARIABLES LIKE 'event_scheduler';
2.Value为ON则已打开，OFF则关闭
如果是OFF，就先打开：
SET GLOBAL event_scheduler = ON;
3.创建想要的定时器
DELIMITER $$
DROP EVENT IF EXISTS deleteData;
CREATE EVENT deleteData
ON SCHEDULE EVERY 300 SECOND //这里300即为每300秒删除一次
ON COMPLETION PRESERVE
DO BEGIN
delete from algm_status where TO_DAYS(now())-TO_DAYS(CREATED_TIME)>2; //距现在超过两天即视为过期，CREATED_TIME是字段名
END$$
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