MySQL event的简单使用

MySQL event的简单使用

—— 查看event的create信息

SHOW CREATE event event_test;

——查看某个schema下的event状态

SELECT event_schema,event_name,STATUS FROM information_schema.events WHERE event_schema = 'xxxx'

 

——查看event功能是否开启

mysql> show variables like '%event%';

+-----------------+-------+

| Variable_name  | Value |

+-----------------+-------+

| event_scheduler | OFF  |

+-----------------+-------+

1 row in set (0.00 sec)

 

开启event功能，可设置为ON|1

mysql> set global event_scheduler=on;

Query OK, 0 rows affected (0.00 sec)

 

mysql> show variables like '%event%';

+-----------------+-------+

| Variable_name  | Value |

+-----------------+-------+

| event_scheduler | ON    |

+-----------------+-------+

1 row in set (0.00 sec)

 

-- 创建测试表

CREATE TABLE t(X DATETIME);

 -- 创建一个测试的proc,为了向测试表中插入系统时间

DELIMITER $$

DROP PROCEDURE IF EXISTS e_test $$

CREATE PROCEDURE e_test()

BEGIN

INSERT INTO t VALUES(NOW());

END $$

DELIMITER ;

 

-- 创建事件

--每隔十秒自动调用e_test()存储过程

CREATE EVENT IF NOT EXISTS event_test

ON SCHEDULE EVERY 10 SECOND

ON COMPLETION PRESERVE

DO CALL e_test();　　

 

过会儿select测试表中的数据，如下：
 

-- 开启事件

　　ALTER EVENT event_test ON

　　COMPLETION PRESERVE ENABLE;

 

-- 关闭事件

　　ALTER EVENT event_test ON

　　COMPLETION PRESERVE DISABLE;

 

 

一些例子：

从现在开始每隔九天定时执行

CREATE EVENT EVENT1

ON SCHEDULE EVERY 9 DAY STARTS NOW()

ON COMPLETION PRESERVE ENABLE

DO

BEGIN

CALL TOTAL();

END

 

每个月的一号凌晨1 点执行

CREATE EVENT EVENT2 ON SCHEDULE EVERY 1 MONTH STARTS

DATE_ADD(DATE_ADD(DATE_SUB(CURDATE(),INTERVAL DAY(CURDATE())-1 DAY), INTERVAL 1 MONTH),INTERVAL 1 HOUR)

ON COMPLETION PRESERVE ENABLE

DO

BEGIN

CALL STAT();

END

 

每个季度一号的凌晨2点执行

CREATE EVENT TOTAL_SEASON_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 2 HOUR)

ON COMPLETION PRESERVE ENABLE

DO

BEGIN

CALL SEASON_STAT();

END

 

每年1月1号凌晨四点执行

CREATE EVENT TOTAL_YEAR_EVENT

ON SCHEDULE EVERY 1 YEAR STARTS DATE_ADD(DATE(CONCAT(YEAR(CURDATE()) + 1,'-',1,'-',1)),INTERVAL 4 HOUR)

ON COMPLETION PRESERVE ENABLE

DO

　BEGIN

　CALL YEAR_STAT();

　END

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