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！