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)