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

开启事件查看器
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 EVENTS IF EXISTS updateInfoStatus

临时关闭事件
ALTER EVENTS updateInfoStatus DISABLE

开启事件
ALTER EVENTS 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