mysql要实现定时执行sql语句就要用到Event

mysql要实现定时执行sql语句就要用到Event具体操作如下：先看看看event 事件是否开启show variables like '%sche%';如没开启，则开启。需要数据库超级权限set global event_scheduler =1;创建存储过程 update_a  (注：就是你要执行的sql语句)mysql> create procedure update_a() update a set a.y_avg=(select avg(b.youhao) from b where a.a_id=b.a_id);创建一个定时任务：event e_updateA mysql> create event if not exists e_updateA    -> on schedule every 60 second      ---设置60秒执行一次              -> on schedule at date_add(now(),interval 1 minute) ---在一分钟后执行    -> on completion preserve    -> do call update_a();    ---执行update_a()存储过程创建Event之后，sql语句就定时执行一次。关闭事件任务mysql> alter event e_updateA ON    -> COMPLETION PRESERVE DISABLE;开启事件任务mysql> alter event e_updateA ON    -> COMPLETION PRESERVE ENABLE;