显示字符集，并将相应字符集更改为utf8
show variables like "%char%";
+--------------------------+---------------+| character_set_system | utf8 |
例如
SET character_set_client='utf8';
SET character_set_connection='utf8';
SET character_set_results='utf8'
创建表时：
CREATE TABLE video_author (
sid bigint(11) NOT NULL AUTO_INCREMENT,
nick varchar(64) NOT NULL,
url' varchar(128) NOT NULL,
video_type set('dota', 'lol', 'hearthstone'),
PRIMARY KEY (sid),
KEY index_name (nick)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
如果使用python的mysql连接，还需要在连接时设置charset，例如：
self.conn=MySQLdb.connect(host="127.0.0.1",user="root", passwd="000", db="app_db",port=3306,charset='utf8')
