mysql事务

1 开始事务begin；

2 提交事务commit；

3 回滚（撤销）事务rollback；

4 代码

update student set userName='流氓+渣男' where id=5;
begin;
update student set userName='流氓da渣男' where id=5;
select * from student where id=5;
update student set userName='独臂大傻雕渣男' where id=4;
select * from student where id=4;
rollback;
commit;

5 效果图