一：问题描述
更新字段为中文内容时，报错：
mysql> update t set description='不好' where id=11;
ERROR 1366 (HY000): Incorrect string value: '\xE4\xB8\x8D\xE5\xA5\xBD' for column 'description' at row 1
二：出错原因
该表和字段的字符集不支持中文
三：解决办法
将表和字段的字符集改为支持中文的字符集如utf8，并和变量like 'char%'的字符集保持一致
四：详细步骤
mysql> show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)
--查看该表字符集
mysql> show create table t;
+-------+----------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+----------------------------------------------------------------------------------------------------------------------------------+
| t | CREATE TABLE `t` (
`id` int(11) DEFAULT NULL,
`description` varchar(100) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+----------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
--查看该字段字符集
mysql> show full columns from t;
+-------------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
| id | int(11) | NULL | YES | | NULL | | select,insert,update,references | |
| description | varchar(100) | latin1_swedish_ci | YES | | NULL | | select,insert,update,references | |
+-------------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
2 rows in set (0.00 sec)
--修改表字符集为utf8
mysql> alter table t default character set utf8;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table t;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| t | CREATE TABLE `t` (
`id` int(11) DEFAULT NULL,
`description` varchar(100) CHARACTER SET latin1 DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
--修改该字段字符集为utf8
mysql> alter table t change description description varchar(100) character set utf8;
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> show full columns from t;
+-------------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| id | int(11) | NULL | YES | | NULL | | select,insert,update,references | |
| description | varchar(100) | utf8_general_ci | YES | | NULL | | select,insert,update,references | |
+-------------+--------------+-----------------+------+-----+---------+-------+---------------------------------+---------+
2 rows in set (0.00 sec)
--现在再次修改字段内容为中文时，就不报错了，如下：
mysql> update t set description ='不好' where id=12;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql>
mysql> select *
-> from t;
+------+-------------+
| id | description |
+------+-------------+
| 11 | good |
| 12 | 不好 |
| 13 | NULL |
+------+-------------+
3 rows in set (0.00 sec)