mysql-Auto_increment值修改

上一篇 / 下一篇  2012-03-13 12:13:31 / 个人分类:Mysql

测试时,为了模拟一些特殊情况,需要修改某张表的下一条记录的Auto_increment值
可通过如下方法进行处理:

查看db.table表的下一条记录auto_increment的值:
show table status from db like 'table';

如:
mysql> show table status from mailbox like 'mailbox';         
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
| Name    | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free |Auto_increment| Create_time         | Update_time         | Check_time          | Collation         | Checksum | Create_options | Comment |
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
| mailbox | MyISAM |      10 | Dynamic    | 1681 |            148 |      249688 | 281474976710655 |       104448 |         0 |         15355| 2012-03-13 11:19:10 | 2012-03-13 11:19:10 | 2012-03-13 11:19:10 | latin1_swedish_ci |     NULL |                |         |
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
1 row in set (0.00 sec)

Auto_increment:15355
这个就是下一条记录会使用的自增ID;


修改db.table表下一条记录使用的自增ID值为20000:
alter table db.table auto_increment=20000;

如:
mysql> alter table mailbox.mailbox auto_increment=
20000;          
Query OK, 1681 rows affected (0.05 sec)

这时再进行
show table status from mailbox like 'mailbox'; 
auto_increment已经变成20000;
新插入的记录,自增字段就会从20000开始;

TAG: auto 修改 increment MySQL mysql

 

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