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mysql的事务运作早就想写了，一直忘了，其实很简单
就三条命令
start transaction
commit
rollback
现在来解释下：
start transaction;
就是开始事务追踪的命令
开始前一定记得写
然后
commit;
这个的意思是说确认提交，执行这个命令就不能rollback了，相当于执行完毕。
最后
rollback;
这个命令很简单，回滚到start transaction时候的状态
现在举例
mysql> select * from useraccount ;
+-----------+--------+-------------+
| accountid | userid | accountname |
+-----------+--------+-------------+
| 1 | 2 | zhifubao |
+-----------+--------+-------------+
1 row in set (0.00 sec)
mysql> start transaction;
query ok, 0 rows affected (0.00 sec)
mysql> update useraccount set userid = 1;
query ok, 1 row affected (0.00 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> select * from useraccount;
+-----------+--------+-------------+
| accountid | userid | accountname |
+-----------+--------+-------------+
| 1 | 1 | zhifubao |
+-----------+--------+-------------+
1 row in set (0.00 sec)
mysql> rollback; (这里假如不想回滚就用commit;就可以完成了）
query ok, 0 rows affected (0.28 sec)
mysql> select * from useraccount;
+-----------+--------+-------------+
| accountid | userid | accountname |
+-----------+--------+-------------+
| 1 | 2 | zhifubao |
+-----------+--------+-------------+
1 row in set (0.00 sec)
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