zoukankan      html  css  js  c++  java
  • MYSQL 事件调度器

    要查看当前是否已开启事件调度器
    SHOW VARIABLES LIKE 'event_scheduler';

    开启事件高度器
    SET GLOBAL event_scheduler = 1;

    创建事件
    语法:
    CREATE EVENT [IF NOT EXISTS] event_name
    ON SCHEDULE schedule
    [ON COMPLETION [NOT] PRESERVE]
    [ENABLE | DISABLE]
    [COMMENT 'comment']
    DO sql_statement;

    实例:
    CREATE EVENT updateInfoStatus  
    ON SCHEDULE EVERY 30 MINUTE   
    DO
    UPDATE `jd_article` SET `status` = 0 WHERE `status` = 1 AND `date` <= now( );

    修改事件
    语法:
    ALTER EVENT event_name
    [ON SCHEDULE schedule]
    [RENAME TO new_event_name]
    [ON COMPLETION [NOT] PRESERVE]
    [COMMENT 'comment']
    [ENABLE | DISABLE]
    [DO sql_statement]

    实例:
    ALTER EVENT updateInfoStatus  
    ON SCHEDULE EVERY 30 MINUTE   
    DO
    UPDATE `jd_article` SET `status` = 0 WHERE `status` = 1 AND `date` <= now( );

    删除事件
    DROP EVENT IF EXISTS updateInfoStatus

    临时关闭事件
    ALTER EVENT updateInfoStatus DISABLE

    开启事件
    ALTER EVENT updateInfoStatus ENABLE

    查看事件详细信息
    SELECT * FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_NAME = 'updateInfoStatus' AND EVENT_SCHEMA = 'jdwc'

    查看所有事件
    SHOW EVENTS

    查看事件创建信息
    SHOW CREATE EVENT updateInfoStatus

  • 相关阅读:
    django 模型层
    django 模板层
    django的视图层
    django-2的路由层(URLconf)
    django简介
    [Codeforces] 650A
    [codevs2916] 校门外的树2
    [Codevs 1690] 开关灯
    codevs3027线段覆盖2(DP)题解
    BC#65T4 ZYB's Tree
  • 原文地址:https://www.cnblogs.com/showblog/p/2601501.html
Copyright © 2011-2022 走看看