定时删除过期数据（MySQL数据表）

class UserInfo(db.Model):	
    __tablename__ = '用户信息表'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(32), index=True	)
    id_card = db.Column(db.String(18), index=True)
    create_time = db.Column(db.DateTime, default=datetime.datetime.now)

SET GLOBAL event_scheduler = 1;
或可以在配置my.cnf文件 中加上 event_scheduler = 1

SHOW VARIABLES LIKE 'event_scheduler';

CREATE EVENT `del_tbl_expired_data`   
ON SCHEDULE EVERY 1 DAY STARTS '2019-05-29 17:33:43'   
ON COMPLETION NOT PRESERVE ENABLE 
DO CALL del_data_count (15);

mysql> delimiter $$　　#将语句的结束符号从分号;临时改为两个$$(可以是自定义)
mysql> CREATE PROCEDURE `del_data_count`(IN `date_inter` INT) 
-> BEGIN
-> 　　DELETE FROM UserInfo
->    WHERE 
->    (TO_DAYS(NOW()) - TO_DAYS(FROM_UNIXTIME(unix_timestamp(create_time),'%Y%m%d'))) >=date_inter
-> END$$
mysql> delimiter ;　　#将语句的结束符号恢复为分号

SHOW EVENTS;

开启某事件：
ALTER EVENT del_tbl_expired_data ON COMPLETION PRESERVE ENABLE;
关闭某事件：
ALTER EVENT del_tbl_expired_data ON COMPLETION PRESERVE DISABLE;