mysql定时任务和事件解决订单自动更新状态问题

#开启event_scheduler sql指令
SHOW VARIABLES LIKE '%event_scheduler%';
SET GLOBAL event_scheduler = ON;

#定义存储过程
DELIMITER |
DROP PROCEDURE IF EXISTS update_device_status |
CREATE PROCEDURE update_device_status()
BEGIN
IF EXISTS(SELECT device_id FROM orderdetail WHERE NOW() < endtime ) THEN
UPDATE device SET state = FALSE WHERE id NOT IN (SELECT device_id FROM orderdetail WHERE NOW() < endtime);
END IF;
END
|
DELIMITER;
#创建定时器，每间隔一秒调用一次存储过程
DELIMITER |
DROP EVENT IF EXISTS event_remind_status |
CREATE EVENT  event_remind_status
ON SCHEDULE EVERY 1 SECOND  DO
BEGIN
CALL update_device_status();
END |
DELIMITER;
#启动定时器
ALTER EVENT event_remind_status ON
COMPLETION PRESERVE ENABLE;