mysql怎么讓一個存儲過程定時執(zhí)行
查看event是否開啟: show variables like '%sche%';
將事件計劃開啟: set global event_scheduler=1;
關(guān)閉事件任務(wù): alter event e_test ON COMPLETION PRESERVE DISABLE;
開戶事件任務(wù): alter event e_test ON COMPLETION PRESERVE ENABLE;
簡單實例.
創(chuàng)建表 CREATE TABLE test(endtime DATETIME);
創(chuàng)建存儲過程test
CREATE PROCEDURE test ()
BEGIN
update examinfo SET endtime = now() WHERE id = 14;
END;
創(chuàng)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秒將執(zhí)行存儲過程test,將當(dāng)前時間更新到examinfo表中id=14的記錄的endtime字段中去
- 首先來看一個簡單的例子來演示每秒插入一條記錄到數(shù)據(jù)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秒鐘后，再執(zhí)行查詢看看：
mysql> SELECT * FROM aaa;
+---------------------+
| timeline |
+---------------------+
| 2007-07-18 20:44:26 |
| 2007-07-18 20:44:27 |
| 2007-07-18 20:44:28 |
+---------------------+
- 5天后清空test表：
CREATE EVENT e_test
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY
DO TRUNCATE TABLE test.aaa;
- 2007年7月20日12點整清空test表：
CREATE EVENT e_test
ON SCHEDULE AT TIMESTAMP '2007-07-20 12:00:00'
DO TRUNCATE TABLE test.aaa;
- 每天定時清空test表：
CREATE EVENT e_test
ON SCHEDULE EVERY 1 DAY
DO TRUNCATE TABLE test.aaa;
- 5天后開啟每天定時清空test表：
CREATE EVENT e_test
ON SCHEDULE EVERY 1 DAY
STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY
DO TRUNCATE TABLE test.aaa;
- 每天定時清空test表，5天后停止執(zhí)行：
CREATE EVENT e_test
ON SCHEDULE EVERY 1 DAY
ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY
DO TRUNCATE TABLE test.aaa;
- 5天后開啟每天定時清空test表，一個月后停止執(zhí)行：
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]可以設(shè)置這個事件是執(zhí)行一次還是持久執(zhí)行，默認為NOT PRESERVE。
- 每天定時清空test表(只執(zhí)行一次，任務(wù)完成后就終止該事件)：
CREATE EVENT e_test
ON SCHEDULE EVERY 1 DAY
ON COMPLETION NOT PRESERVE
DO TRUNCATE TABLE test.aaa;
[ENABLE | DISABLE]可是設(shè)置該事件創(chuàng)建后狀態(tài)是否開啟或關(guān)閉，默認為ENABLE。
[COMMENT ‘comment’]可以給該事件加上注釋。
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]
- 臨時關(guān)閉事件
ALTER EVENT e_test DISABLE;
- 開啟事件
ALTER EVENT e_test ENABLE;
- 將每天清空test表改為5天清空一次：
ALTER EVENT e_test
ON SCHEDULE EVERY 5 DAY;
四、刪除事件(DROP EVENT)
語 法很簡單，如下所示：
DROP EVENT [IF EXISTS] event_name
例如刪除前面創(chuàng)建的e_test事件
DROP EVENT e_test;
當(dāng)然前提是這個事件存在，否則會產(chǎn)生ERROR 1513 (HY000): Unknown event錯誤，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');
解釋：從2007-09-01開始，每天對表yyy在12：00：00進行一個插入操作。而且只執(zhí)行一次（on completion not preserve ）
我的計劃任務(wù)為：
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、通過設(shè)定全局變量event_scheduler 的值即可動態(tài)的控制事件調(diào)度器是否啟用。
查看是否event_scheduler開啟mysql> SHOW VARIABLES LIKE '%event%';
設(shè)置開啟mysql> SET GLOBAL event_scheduler=ON;
四、例子:
每分鐘插入一條日志: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//
調(diào)用存儲過程: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//
