一、查看当前数据库编码

show variables like '%character%';

可以看到默认的character_set_database编码格式，这里能够看到默认的是latin1.

修改某个数据库的编码方式，进入到该数据库下面，如greenpass

修改为gb2312编码方式：

mysql>use greenpass；

mysql>alter database greenpass character set gb2312;

mysql>show variables like 'character_set_database';

修改为utf-8编码方式：

mysql> alter database greenpass character set UTF8;

mysql> flush privileges;

mysql>show variables like 'character_set_database';

二、修改配置文件

-在 [mysqld] 标签下加上以下内容：

default-character-set = utf8

character_set_server = utf8

注意：如果此标签下已经存在“default-character-set=GBK”类似的内容，只需修改即可。

--在 [mysql]  标签下加上一行

default-character-set = utf8

--在 [mysql.server]标签下加上一行

default-character-set = utf8 

--在 [mysqld_safe]标签下加上一行

default-character-set = utf8 

--在 [client]标签下加上一行

default-character-set = utf8

重启mysql服务即可。

3、数据库编码验证

进入mysql后 执行 ：show variables like "% character %";
显示结果应该类似如下：

| character_set_client | utf8 |

| character_set_connection | utf8 |

| character_set_database | utf8 |

| character_set_results | utf8 |

| character_set_server | utf8 |

| character_set_system | utf8 |

| character_sets_dir | /usr/share/mysql/charsets/ |

如果仍有编码不是utf8的，请检查配置文件，也可使用mysql命令设置：

set character_set_client = utf8;

set character_set_server = utf8;

set character_set_connection = utf8;

set character_set_database = utf8;

set character_set_results = utf8;

set collation_connection = utf8_general_ci;

set collation_database = utf8_general_ci;

set collation_server = utf8_general_ci;

另外：

 建立数据库时可以使用以下命令：

create database app_relation character set utf8; 

use app_relation;

source app_relation.sql;

修改数据库编码的命令为：

alter database app_relation character set utf8;