1、首先检查默认安装的字符集

mysql> show variables like '%char%';

+--------------------------+--------------------------------------------------------+

| 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/local/mysql-5.6.23-osx10.8-x86_64/share/charsets/ |

+--------------------------+--------------------------------------------------------+

8 rows in set (0.00 sec)

character_set_database和character_set_server依然是latin1的字符集，也就是说mysql后续创建的表都是latin1字符集的，不是utf8，会造成一些麻烦。所以有必要修改my.cnf，在修改my.cnf之前一定要关闭mysql进程，不然会遇到mysql的sock不能连接的问题。

2、查看是否有my.cnf文件在/etc/目录下

ls -al /etc/

检查了一下，发现本机没有my.cnf，查看了很多资料，他们说可以去/usr/local/mysql的安装目录下找到support-files，复制下面格式类似my-**.cnf的文件到/etc/目录下即可。命令如下：

cp /usr/local/mysql/support-files/my-default.cnf /etc/

3、修改/etc/my-default.cnf文件名为my.cnf，并修改里面的配置

cat /etc/my.cnf

查看配置文件的内容

ls -l /etc/my.cnf

查看文件的读写权限，如果为644(rw- r-- r--)则改为(664) (rw- rw- r--)

如果改为(666)(rw- rw- rw-)则修改以后配置文件不会生效。下面详细讲解为什么不会生效。

sudo chmod 664 /etc/my.cnf

输入密码即可。

4、修改配置文件内容

vi /etc/my.cnf

在文件最上面加上

[client]

default-character-set=utf8

在[mysqld]下增加

character-set-server=utf8

键入:wq!保存并退出

5、重新查看编码集

mysql> show variables like '%char%';

+--------------------------+--------------------------------------------------------+

| 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/local/mysql-5.6.23-osx10.8-x86_64/share/charsets/ |

+--------------------------+--------------------------------------------------------+

8 rows in set (0.00 sec)