MySQL定时器常用案例

show VARIABLES like 'event_scheduler'

SET GLOBAL event_scheduler = 1;

DROP EVENT IF EXISTS 定时器名称 ;	
CREATE EVENT user_event
    ON  SCHEDULE  xx     -- 定时器从什么开始执行的 (必须)
	ENDS CURRENT_TIMESTAMP  xx    -- 定时器开始后在什么时候结束 (非必选)
    ON COMPLETION xx       -- 定时器清除策略 (默认就行)
DO  sql语句   -- 定时器执行的内容,只允许一条sql语句以分号结束 (必须)

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
ON SCHEDULE EVERY 9 DAY STARTS NOW()
DO  call user_procedure();

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
on schedule EVERY 1 DAY STARTS date_add(date( ADDDATE(curdate(),1)),interval 1 hour)  
DO  call user_procedure();  

DROP EVENT IF EXISTS 定时器名称 ;	
CREATE EVENT user_event
ON schedule every 1 month starts date_add(date_add(date_sub(curdate(),interval day(curdate())-1 day),interval 1 month),interval 1 hour)
DO  call user_procedure();  

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
ON schedule every 1 quarter starts date_add(date_add(date(concat(year(curdate()),'-',elt(quarter(curdate()),1,4,7,10),'-',1)),interval 1 quarter),interval 1 hour)
DO  call user_procedure();  

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
ON schedule every 1 quarter starts date_add(date_add(date(concat(year(curdate()),'-',elt(quarter(curdate()),1,4,7,10),'-',1)),interval 1 quarter),interval 1 hour)
DO  call user_procedure();  

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
    ON SCHEDULE EVERY 1 DAY
    ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY
DO  call user_procedure();

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
		ON SCHEDULE EVERY 1 DAY
    STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY
    ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH
DO  call user_procedure();

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
    ON SCHEDULE AT TIMESTAMP '2021-09-24 18:26:00'
    ON COMPLETION NOT PRESERVE
DO  call user_procedure();

DROP EVENT IF EXISTS user_event ;	
CREATE EVENT user_event
    ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 HOUR
    ON COMPLETION NOT PRESERVE
DO  call user_procedure();

alter event user_event on completion preserve enable; -- 开启定时任务
alter event user_event on completion preserve disable; -- 关闭定时任务

select * from information_schema.`EVENTS`;

select * from  mysql.event;