记录-MySQL中的事件调度Event Scheduler

下面是自己的实例

/*查询event是否开启（查询结果Off为关闭 On为开启）*/
show variables like '%sche%';

/*开启/关闭命令（1开启--0关闭）*/
set global event_scheduler=1;

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

创建event
use vanke20151209
CREATE EVENT e_test_insert
ON SCHEDULE EVERY 60 SECOND
DO call up_appointment_del();

CREATE PROCEDURE up_appointment_del()
BEGIN
UPDATE appointment a SET a.Deleted =TRUE WHERE a.Deleted=0 AND TIMESTAMPDIFF(day,a.CreateTime,NOW()) >=a.CancelDay;
END

查看event是否开启: show variables like '%sche%'; 
将事件计划开启: set global event_scheduler=1; 
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; 

简要查询存在的：show events

简单实例. 
创建表 CREATE TABLE test(endtime DATETIME); 

创建存储过程test 
CREATE PROCEDURE test () 
BEGIN 
update examinfo SET endtime = now() WHERE id = 14; 
END; 

创建event e_test 
CREATE EVENT if not exists e_test 
on schedule every 30 second 
on completion preserve 
do call test(); 

每隔30秒将执行存储过程test,将当前时间更新到examinfo表中id=14的记录的endtime字段中去 




1) 首先来看一个简单的例子来演示每秒插入一条记录到数据表 

USE test; 
CREATE TABLE aaa (timeline TIMESTAMP); 
CREATE EVENT e_test_insert 
ON SCHEDULE EVERY 1 SECOND 
DO INSERT INTO test.aaa VALUES (CURRENT_TIMESTAMP); 
等待3秒钟后，再执行查询看看： 
copyright dedecms

mysql> SELECT * FROM aaa; 
+---------------------+ 
| timeline | 
+---------------------+ 
| 2007-07-18 20:44:26 | 
| 2007-07-18 20:44:27 | 
| 2007-07-18 20:44:28 | 
+---------------------+ 
2) 5天后清空test表： 

CREATE EVENT e_test 
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY 
DO TRUNCATE TABLE test.aaa; 
3) 2007年7月20日12点整清空test表： 

CREATE EVENT e_test 
ON SCHEDULE AT TIMESTAMP '2007-07-20 12:00:00' 
DO TRUNCATE TABLE test.aaa; 
4) 每天定时清空test表： 

CREATE EVENT e_test 
ON SCHEDULE EVERY 1 DAY 
DO TRUNCATE TABLE test.aaa; 
5) 5天后开启每天定时清空test表： 

CREATE EVENT e_test 
ON SCHEDULE EVERY 1 DAY 
STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY 
DO TRUNCATE TABLE test.aaa; 
6) 每天定时清空test表，5天后停止执行： 

CREATE EVENT e_test 
ON SCHEDULE EVERY 1 DAY 
ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY 
DO TRUNCATE TABLE test.aaa; 
7) 5天后开启每天定时清空test表，一个月后停止执行： 本文来自织梦 

CREATE EVENT e_test 
ON SCHEDULE EVERY 1 DAY 
STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY 
ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH 
DO TRUNCATE TABLE test.aaa; 
[ON COMPLETION [NOT] PRESERVE]可以设置这个事件是执行一次还是持久执行，默认为NOT PRESERVE。 
8) 每天定时清空test表(只执行一次，任务完成后就终止该事件)： 

CREATE EVENT e_test 
ON SCHEDULE EVERY 1 DAY 
ON COMPLETION NOT PRESERVE 
DO TRUNCATE TABLE test.aaa; 
[ENABLE | DISABLE]可是设置该事件创建后状态是否开启或关闭，默认为ENABLE。 
[COMMENT ‘comment’]可以给该事件加上注释。 

三、修改事件(ALTER EVENT) 
ALTER EVENT event_name 
[ON SCHEDULE schedule] 
[RENAME TO new_event_name] 
[ON COMPLETION [NOT] PRESERVE] 
[COMMENT 'comment'] 
[ENABLE | DISABLE] 
[DO sql_statement] 
1) 临时关闭事件 

ALTER EVENT e_test DISABLE; 
2) 开启事件 

ALTER EVENT e_test ENABLE; 
3) 将每天清空test表改为5天清空一次： 

ALTER EVENT e_test 
ON SCHEDULE EVERY 5 DAY; 
四、删除事件(DROP EVENT)
织梦好，好织梦

语 法很简单，如下所示： 

DROP EVENT [IF EXISTS] event_name 
例如删除前面创建的e_test事件 

DROP EVENT e_test; 
当然前提是这个事件存在，否则会产生ERROR 1513 (HY000): Unknown event错误，因此最好加上IF EXISTS 

DROP EVENT IF EXISTS e_test; 

create event test 
ON SCHEDULE AT '2007-09-01 12:00:00' + INTERVAL 1 DAY 
on completion not preserve 
do insert into yyy values('hhh','uuu'); 

解释：从2007-09-01开始，每天对表yyy在12：00：00进行一个插入操作。而且只执行一次（on completion not preserve ） 

我的计划任务为： 

create event sysplan 
ON SCHEDULE AT '2010-05-22 23:00:00' + INTERVAL 1 DAY 
on completion not preserve 
do truncate table bjproj.ae_tmp; 


三、通过设定全局变量event_scheduler 的值即可动态的控制事件调度器是否启用。 
查看是否event_scheduler开启mysql> SHOW VARIABLES LIKE '%event%'; 
设置开启mysql> SET GLOBAL event_scheduler=ON; 
四、例子: 
每分钟插入一条日志:DELIMITER //CREATE EVENT `user_log_event` ON SCHEDULE EVERY 1 MINUTE STARTS '2010-12-27 00:00:00' ON COMPLETION NOT PRESERVE ENABLE DO BEGIN INSERT INTO log SET addtime=NOW();END//
织梦好，好织梦

调用存储过程:DELIMITER //CREATE EVENT `user_log_event` ON SCHEDULE EVERY 1 DAY STARTS '2010-00-00 00:00:00' ON COMPLETION NOT PRESERVE ENABLE DO BEGIN CALL user_log_prov();END// 

在MySQL 5.5 Command Line Client下调试通过。

原文：http://blog.chinaunix.net/uid-22301538-id-3409644.html