定时清理mysql表数据 event

虚拟机安装maridb做测试，简单快捷。mysql安装教程_懂视生活_懂你更懂生活

建个测试表

create table test_event(
  id int,
  log_time datetime
);

写入测试数据

insert into test_event (id,log_time) values (1,"2021-09-19 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-20 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-21 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-22 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-23 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-24 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-25 00:00:00");
insert into test_event (id,log_time) values (1,"2021-09-26 00:00:00");

创建event

DROP EVENT IF EXISTS deleteLog;
CREATE EVENT deleteLog
ON SCHEDULE EVERY 60 SECOND
ON COMPLETION PRESERVE
DO 
delete from test_event where TO_DAYS(now())-TO_DAYS(log_time)>5;

详细说明:

SCHEDULE EVERY 60 SECOND : 每1分钟执行一次

还有很多比如:   YEAR，MONTH，DAY，HOUR，MINUTE 或者SECOND

test_event : 你要操作的表

log_time : 表中含有事件的字段(必须有含有时间的字段 不然没有办法对比)

TO_DAYS(now())-TO_DAYS(log_time)>90 : 当前时间减去字段(log_time) 时间 大于5天就 删除这些数据 

查看event

select * from mysql.event;

 生效结果