Linux下MySQL5.5的修改字符集编码为UTF8，彻底解决中文乱码问题

一、登录MySQL查看用SHOW VARIABLES LIKE ‘character%’;下字符集，显示如下：

+--------------------------+----------------------------+ | 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/ | +--------------------------+----------------------------+ character_set_database和character_set_server的默认字符集还是latin1。

二、最简单的完美修改方法，修改mysql的my.cnf文件中的字符集键值（注意配置的字段细节）：

1、在[client]字段里加入default-character-set=utf8，如下：

[client] port = 3306 socket = /var/lib/mysql/mysql.sock default-character-set=utf8 2、在[mysqld]字段里加入character-set-server=utf8，如下：

[mysqld] port = 3306 socket = /var/lib/mysql/mysql.sock character-set-server=utf8 3、在[mysql]字段里加入default-character-set=utf8，如下：

[mysql] no-auto-rehash default-character-set=utf8 修改完成后，service mysql restart重启mysql服务就生效。注意：[mysqld]字段与[mysql]字段是有区别的。这点在网上没人反馈过。

使用SHOW VARIABLES LIKE ‘character%’;查看，发现数据库编码全已改成utf8。

+--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ 4、如果上面的都修改了还乱码，那剩下问题就一定在connection连接层上。解决方法是在发送查询前执行一下下面这句（直接写在SQL文件的最前面）： SET NAMES ‘utf8′;

它相当于下面的三句指令：

SET character_set_client = utf8; SET character_set_results = utf8;

SET character_set_connection = utf8;

网上很多其他方法不能彻底解决这个问题，这个可以完美解决