PS：昨天一同事遇到mysql 5.5中文乱码问题，找我解决。解决了，有个细节问题网上没人说，我就总结一下。

一、登录MySQL查看用SHOW VARIABLES LIKE ‘character%’;(正确命令为show variables like "%char%";)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！