1.设置开启event scheduler

SET GLOBAL event_scheduler=1;

2.验证event_scheduler是否已经开启

show variables like ‘%event%’; #值为 ON 表明已开启
SHOW VARIABLES LIKE ‘event_scheduler’;
3.创建event

DROP EVENT IF EXISTS e_delete_upvote;
CREATE EVENT e_delete_upvote
ON SCHEDULE EVERY 1 day STARTS DATE_ADD(current_date(),INTERVAL 1 DAY) ON COMPLETION PRESERVE ENABLE
DO
TRUNCATE TABLE dreamland.upvote;

说明： ON SCHEDULE EVERY 1 day 指定循环间隔为每天执行

STARTS date_add(concat(current_date(), ‘ 23:59:00’), interval 0 second)
指定运行时间为23:59:00 ON COMPLETION PRESERVE ENABLE 指定创建完成后即启用，否则需手动启动

4.手动关闭事件

ALTER EVENT e_delete_upvote DISABLE;

5.手动该事件为可用

ALTER EVENT e_delete_upvote ENABLE;

6.查看已有的定时事件任务

SHOW EVENTS;

7.删除事件

DROP EVENT e_delete_upvote;