mysql的event的簡單使用

—— 檢視event的create資訊

SHOW CREATE event event_test;

——檢視某個schema下的event狀態

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

 

——檢視event功能是否開啟

mysql> show variables like '%event%';

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

| Variable_name   | Value |

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

| event_scheduler | OFF   |

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

1 row in set (0.00 sec)

 

開啟event功能，可設定為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)

 

-- 建立測試表

CREATE TABLE t(X DATETIME);

-- 建立一個測試的proc,為了向測試表中插入系統時間

DELIMITER $$

DROP PROCEDURE IF EXISTS e_test $$

CREATE PROCEDURE e_test()

BEGIN

INSERT INTO t VALUES(NOW());

END $$

DELIMITER ;

 

-- 建立事件

--每隔十秒自動呼叫e_test()儲存過程

CREATE EVENT IF NOT EXISTS event_test

ON SCHEDULE EVERY 10 SECOND

ON COMPLETION PRESERVE

DO CALL e_test();　　

 

過會兒select測試表中的資料，如下：

-- 開啟事件

　　ALTER EVENT event_test ON

　　COMPLETION PRESERVE ENABLE;

-- 關閉事件

　　ALTER EVENT event_test ON

　　COMPLETION PRESERVE DISABLE;

 

 

一些例子：

從現在開始每隔九天定時執行

CREATE EVENT EVENT1

ON SCHEDULE EVERY 9 DAY STARTS NOW()

ON COMPLETION PRESERVE ENABLE

DO

BEGIN

CALL TOTAL();

END

每個月的一號凌晨1 點執行

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

 

每個季度一號的凌晨2點執行

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號凌晨四點執行

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