转自：http://www.cnblogs.com/dadadechengzi/p/6034212.html

查看mysql数据编码

登录MySQL服务，查看mysql数据库默认的编码

mysql> show variables like 'character%';
+--------------------------+-------------------------------------------------+
| Variable_name            | Value                                           |
+--------------------------+-------------------------------------------------+
| character_set_client     | gbk                                             |
| character_set_connection | gbk                                             |
| character_set_database | latin1 | | character_set_filesystem | binary | | character_set_results | gbk | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | E:\0Develop\mysql-5.7.15-winx64\share\charsets\ | +--------------------------+-------------------------------------------------+ 8 rows in set, 1 warning (0.00 sec) mysql>

可以看出database和server都采用了latin1编码，不支持中文，我们需要把它修改为utf-8。

除了这两个，其它的如下

| 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 | E:\0Develop\mysql-5.7.15-winx64\share\charsets\ 

设置mysql数据库编码

在mysql安装目录下，将 my-default.ini 复制一分保存为 my.ini 
做如下修改 

主要看红色框里的内容

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci [mysql]
default-character-set = utf8 [mysql.server] default-character-set = utf8 [mysqld_safe] default-character-set = utf8 [client] default-character-set = utf8 

然后删除你当前的mysql服务，再重新注册mysql服务 
注：一定要以管理员的权限运行dos命令，且cd到mysql安装目录下的bin目录，再注册mysql服务

C:\Windows\system32>sc delete mysql
[SC] DeleteService 成功C:\Windows\system32>e: cd E:\>cd E:\0Develop\mysql-5.7.15-winx64\bin E:\0Develop\mysql-5.7.15-winx64\bin>mysqld --install mysql --defaults-file="E:\0Develop\mysql-5.7.15-winx64\my.ini" The service already exists! The current server installed: E:\0Develop\mysql-5.7.15-winx64\bin\mysqld MySQL E:\0Develop\mysql-5.7.15-winx64\bin>net stop mysql MySQL 服务正在停止..服务名无效。 请键入 NET HELPMSG 2185 以获得更多的帮助。 E:\0Develop\mysql-5.7.15-winx64\bin>mysqld --install mysql --defaults-file="E:\0Develop\mysql-5.7.15-winx64\my.ini" Service successfully installed. E:\0Develop\mysql-5.7.15-winx64\bin>

结果

启动服务，查看编码

C:\Windows\System32>net start mysql
mysql 服务正在启动 .
mysql 服务已经启动成功。C:\Windows\System32>mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.15 MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> show variables like 'character%';
+--------------------------+-------------------------------------------------+
| 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 | E:\0Develop\mysql-5.7.15-winx64\share\charsets\ | +--------------------------+-------------------------------------------------+ 8 rows in set, 1 warning (0.00 sec) mysql>