字符集出現錯誤解決辦法
出現的問題：
mysql> update users
-> set username='關羽'
-> where userid=2;
ERROR 1366 (HY000): Incorrect string value: '/xB9/xD8/xD3/xF0' for column 'usern
ame' at row 1
向表中插入中文字符時，出現錯誤。
mysql> select * from users;
+--------+----------+
| userid | username |
+--------+----------+
| 2 | ???? |
| 3 | ???? |
| 4 | ?í?ù |
+--------+----------+
3 rows in set (0.00 sec)
表中的中文字符位亂碼。
解決辦法：
使用命令：
mysql> status;
--------------
mysql Ver 14.12 Distrib 5.0.45, for Win32 (ia32)
Connection id: 8
Current database: test
Current user: root@localhost
SSL: Not in use
Using delimiter: ;
Server version: 5.0.45-community-nt MySQL Community Edition (GPL)
Protocol version: 10
Connection: localhost via TCP/IP
Server characterset: latin1
Db characterset: latin1
Client characterset: gbk
Conn. characterset: gbk
TCP port: 3306
Uptime: 7 hours 39 min 19 sec
Threads: 2 Questions: 174 Slow queries: 0 Opens: 57 Flush tables: 1 Open ta
bles: 1 Queries per second avg: 0.006
--------------
查看mysql發現Server characterset，Db characterset的字符集設成了latin1，所以出現中文亂碼。
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| users |
+----------------+
1 row in set (0.00 sec)
更改表的字符集。
mysql> alter table users character set GBK;
Query OK, 3 rows affected (0.08 sec)
Records: 3 Duplicates: 0 Warnings: 0
查看錶的結構：
mysql> show create users;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'users
' at line 1
mysql> show create table users;
+-------+-----------------------------------------------------------------------
------------------------------------------------------------------------------+
| Table | Create Table
|
+-------+-----------------------------------------------------------------------
------------------------------------------------------------------------------+
| users | CREATE TABLE `users` (
`userid` int(11) default NULL,
`username` char(20) character set latin1 default NULL
) ENGINE=InnoDB DEFAULT CHARSET=gbk |
+-------+-----------------------------------------------------------------------
------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> desc users;
+----------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+----------+------+-----+---------+-------+
| userid | int(11) | YES | | NULL | |
| username | char(20) | YES | | NULL | |
+----------+----------+------+-----+---------+-------+
2 rows in set (0.02 sec)
這時向表中插入中文然後有錯誤。
mysql> insert into users values(88,'中文');
ERROR 1366 (HY000): Incorrect string value: '/xD6/xD0/xCE/xC4' for column 'usern
ame' at row 1
mysql> insert into users values(88,'中文');
ERROR 1366 (HY000): Incorrect string value: '/xD6/xD0/xCE/xC4' for column 'usern
ame' at row 1
還要更改users表的username的字符集。
mysql> alter table users modify username char(20) character set gbk;
ERROR 1366 (HY000): Incorrect string value: '/xC0/xEE/xCB/xC4' for column 'usern
ame' at row 1
mysql> alter table users modify username char(20) character set gbk;
ERROR 1366 (HY000): Incorrect string value: '/xC0/xEE/xCB/xC4' for column 'usern
ame' at row 1
因爲表中已經有數據，所以更改username字符集的操作沒有成***
清空users表中的數據
mysql> truncate table users;
Query OK, 3 rows affected (0.01 sec)
從新更改user表中username的字符集
mysql> alter table users modify username char(20) character set gbk;
Query OK, 0 rows affected (0.06 sec)
Records: 0 Duplicates: 0 Warnings: 0
這時再插入中文字符，插入成***。
mysql> insert into users values(88,'中文');
Query OK, 1 row affected (0.01 sec)
mysql> select * from users;
+--------+----------+
| userid | username |
+--------+----------+
| 88 | 中文 |
+--------+----------+
補充下
修改某列字符編碼：
alter table tbl_name modify col_name varchar(256) character set gb2312;
創建表時指定編碼：
CREATE TABLE t1
(
c1 CHAR(10) CHARACTER SET latin1 COLLATE latin1_german1_ci
) DEFAULT CHARACTER SET latin2 COLLATE latin2_bin;