mysql的事务运作

mysql的事务运作

早就想写了，一直忘了，其实很简单

1. 就三条命令

   start transaction
   commit
   rollback

2. 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

3. 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)