参考博客：https://blog.csdn.net/qq_26562641/article/details/53301407

查看event是否开启: show variables like '%sche%';

event_scheduler ON                         --------》表示已开启
performance_schema OFF
performance_schema_events_waits_history_long_size 10000
performance_schema_events_waits_history_size 10
performance_schema_max_cond_classes 80

.........

将事件计划开启: set global event_scheduler=1;  临时开启(mysql服务重启后之后失效)

永久开启：

在my.cnf或my_default.ini中的[mysqld]部分添加如下内容，然后重启mysql(mysql重启命令：service mysqld restart)

event_scheduler=ON

关闭事件任务: alter event e_test ON COMPLETION PRESERVE DISABLE; 
开户事件任务: alter event e_test ON COMPLETION PRESERVE ENABLE;

查看任务列表

SELECT * FROM information_schema.events;

创建一个简单的计划任务，这里调用的是存储过程。do 后面也可以跟sql

//从现在起每30s执行一次这个存储过程

 CREATE EVENT if not exists e_test

          on schedule every 30 second

          on completion preserve

     do call test(); 

//每天凌晨一点执行存储过程

CREATE EVENT IF NOT EXISTS temp_event

ON SCHEDULE EVERY 1 DAY STARTS DATE_ADD(DATE_ADD(CURDATE(), INTERVAL 1 DAY), INTERVAL 1 HOUR)

ON COMPLETION PRESERVE ENABLE

DO update users set support=0 where support=1;

关闭定时任务temp_event

DROP event temp_event;