修改mysql默认字符编码为utf8

MySQL的默认编码是Latin1，不支持中文，要支持中文须要把数据库的默认编码修改成gbk或者utf8。
一、修改数据库字符编码
mysql> alter database mydb character set utf8 ;
二、建立数据库时，指定数据库的字符编码
mysql> create database mydb character set utf8 ;
三、查看mysql数据库的字符编码
mysql> show variables like 'character%'; //查询当前mysql数据库的全部属性的字符编码
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | latin1                     |
| character_set_connection | latin1                     |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | latin1                     |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
四、修改mysql数据库的字符编码
修改字符编码必需要修改mysql的配置文件my.cnf,而后重启才能生效
一般须要修改my.cnf的以下几个地方：
【client】下面，加上default-character-set=utf8，或者character_set_client=utf8
【mysqld】下面，加上character_set_server = utf8 ；
由于以上配置，mysql默认是latin1，若是仅仅是经过命令行客户端，mysql重启以后就不起做用了。
以下是客户端命令行修改方式，不推荐使用
mysql> set character_set_client=utf8 ;
mysql> set character_set_connection=utf8 ;
mysql> set character_set_database=utf8 ;
mysql> set character_set_database=utf8 ;
mysql> set character_set_results=utf8 ;
mysql> set character_set_server=utf8 ;
mysql> set character_set_system=utf8 ;
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       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
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