一、登錄MySQL查看用SHOW VARIABLES LIKE ‘character%’;下字符集，顯示如下：
+--------------------------+----------------------------+ | 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/share/mysql/charsets/ | +--------------------------+----------------------------+
character_set_database和character_set_server的默認字符集還是latin1。
二、最簡單的完美修改方法，修改mysql的my.cnf文件中的字符集鍵值（注意配置的字段細節）：
1、在[client]字段里加入default-character-set=utf8，如下：
[client] port = 3306 socket = /var/lib/mysql/mysql.sock default-character-set=utf8
2、在[mysqld]字段里加入character-set-server=utf8，如下：
[mysqld] port = 3306 socket = /var/lib/mysql/mysql.sock character-set-server=utf8
3、在[mysql]字段里加入default-character-set=utf8，如下：
[mysql] no-auto-rehash default-character-set=utf8
修改完成後，service mysql restart重啓mysql服務就生效。注意：[mysqld]字段與[mysql]字段是有區別的。這點在網上沒人反饋過。
使用SHOW VARIABLES LIKE ‘character%’;查看，發現數據庫編碼全已改成utf8。
+--------------------------+----------------------------+ | 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/ | +--------------------------+----------------------------+
4、如果上面的都修改了還亂碼，那剩下問題就一定在connection連接層上。解決方法是在發送查詢前執行一下下面這句（直接寫在SQL文件的最前面）：SET NAMES ‘utf8′;
它相當於下面的三句指令：
SET character_set_client = utf8; SET character_set_results = utf8; SET character_set_connection = utf8;
網上很多其他方法不能徹底解決這個問題，這個可以完美解決！