一、检查默认字符集

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-5.7.19-macos10.12-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。

二、关闭 mysqld 后台进程

三、修改 mysql 配置文件

sudo vi /etc/my.cnf

添加如下内容

[client]

default-character-set=utf8

[mysqld]

character-set-server=utf8

然后重启 mysql

四、检查结果

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-5.7.19-macos10.12-x86_64/share/charsets/ |

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

8 rows in set (0.01 sec)