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)