修改mysql默认字符集的方法
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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