show variables like '%event_scheduler%';

set global event_scheduler=1;

[mysqld]
event_scheduler=ON 

create PROCEDURE sched_clean() --命名
BEGIN
-- 定义参数
DECLARE begin_time BIGINT DEFAULT UNIX_TIMESTAMP(DATE_SUB(CURRENT_DATE(),interval 31 DAY))*1000;
DECLARE end_time BIGINT DEFAULT UNIX_TIMESTAMP(DATE_SUB(CURRENT_DATE(),interval 30 DAY))*1000;
-- 更新数据
UPDATE test_table SET rule_cost=null WHERE start_time>begin_time and start_time<end_time;
END

CREATE EVENT `demo`.`day_of_clean_event`
ON SCHEDULE EVERY '1' DAY STARTS DATE_ADD(DATE_ADD(CURDATE(), INTERVAL 1 DAY), INTERVAL 1 HOUR)
ON completion preserve disable
DO call sched_clean();

SELECT event_name,event_definition,interval_value,interval_field,status FROM information_schema.EVENTS;

alter event event_name on completion preserve enable;//开启定时任务
alter event event_name on completion preserve disable;//关闭定时任务

on schedule every 1 second //每秒执行1次
on schedule every 2 minute //每两分钟执行1次
on schedule every 3 day //每3天执行1次

on schedule at current_timestamp()+interval 5 day // 5天后执行
on schedule at current_timestamp()+interval 10 minute // 10分钟后执行
on schedule at '2016-10-01 21:50:00' // 在2016年10月1日，晚上9点50执行

on schedule every 1 day starts current_timestamp()+interval 5 day ends current_timestamp()+interval 1 month // 5天后开始每天都执行执行到下个月底
on schedule every 1 day ends current_timestamp()+interval 5 day //从现在起每天执行，执行5天