create table user(

id int primary key auto_increment,

name char(32),

balance int

);

insert into user(name,balance)

values

('大木木',1000),

('二木木',1000),

('三木木',1000);

#原子操作

start transaction;

update user set balance=900 where name='大木木'; #买支付100元

update user set balance=1010 where name='二木木'; #中介拿走10元

update user set balance=1090 where name='三木木'; #卖家拿到90元

commit;

#出现异常，回滚到初始状态

start transaction;

update user set balance=900 where name='大木木'; #买支付100元

update user set balance=1010 where name='二木木'; #中介拿走10元

uppdate user set balance=1090 where name='三木木'; #卖家拿到90元,出现异常没有拿到

rollback;  #回到原来的状态

commit;

mysql> select * from user;

+----+------+---------+

| id | name | balance |

+----+------+---------+

|  1 | 大木木  |    1000 |

|  2 | 二木木  |    1000 |

|  3 | 三木木  |    1000 |

+----+------+---------+

3 rows in set (0.00 sec)