http://*.com/questions/3513773/change-mysql-default-character-set-to-utf-8-in-my-cnf
https://dev.mysql.com/doc/refman/5.0/en/charset-configuration.html

编辑 /etc/my.conf文件，增加以下内容

[client]

default-character-set=utf8

[mysql]

default-character-set=utf8

[mysqld]

collation-server = utf8_unicode_ci

init-connect='SET NAMES utf8'

character-set-server = utf8