• mysql怎么让一个存储过程定时执行


     
    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// 
     
    MySQL 5.5 Command Line Client下调试通过。
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  • 原文地址:https://www.cnblogs.com/-lpf/p/4566450.html
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