(1) 最簡單的修改方法，就是修改mysql的my.ini文件中的字符集鍵值，
如 default-character-set = utf8
character_set_server = utf8
修改完後，重啟mysql的服務，service mysql restart
使用 mysql> SHOW VARIABLES LIKE 'character%';查看，發現數據庫編碼均已改成utf8
復制代碼 代碼如下:
+--------------------------+---------------------------------+
| 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 | D:"mysql-5.0.37"share"charsets" |
+--------------------------+---------------------------------+
(2) 還有一種修改mysql默認字符集的方法，就是使用mysql的命令
復制代碼 代碼如下:
mysql> SET character_set_client = utf8 ;
mysql> SET character_set_connection = utf8 ;
mysql> SET character_set_database = utf8 ;
mysql> SET character_set_results = utf8 ;
mysql> SET character_set_server = utf8 ;
mysql> SET collation_connection = utf8 ;
mysql> SET collation_database = utf8 ;
mysql> SET collation_server = utf8 ;
一般就算設置了表的mysql默認字符集為utf8並且通過UTF-8編碼發送查詢，你會發現存入數據庫的仍然是亂碼。問題就出在這個connection連接層上。解決方法是在發送查詢前執行一下下面這句：
復制代碼 代碼如下:
SET NAMES 'utf8';
它相當於下面的三句指令：
復制代碼 代碼如下:
SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;
