SET NAMES 'utf8';  

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(1) 最简单的修改方法，就是修改mysql的my.ini文件中的字符集键值，

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如 default-character-set = utf8?

character_set_server = utf8

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修改完后，重启mysql的服务，service mysql restart

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使用 mysql> SHOW VARIABLES LIKE 'character%';查看，发现数据库编码均已改成utf8

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+--------------------------+---------------------------------+ ??

| 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) 还有一种修改mysql默认字符集的方法，就是使用mysql的命令

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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 ; 

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一般就算设置了表的mysql默认字符集为utf8并且通过UTF-8编码发送查询，你会发现存入数据库的仍然是乱码。问题就出在这个connection连接层上。解决方法是在发送查询前执行一下下面这句：

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SET NAMES 'utf8';  

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它相当于下面的三句指令：

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SET character_set_client = utf8;  
SET character_set_results = utf8;   
SET character_set_connection = utf8; 

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