原来5.1之前，可以在/etc/my.cnf里面加default-character-set=utf8就OK，
到5.5.9之后，，好像原来那个配置不管用了，，改成了另一个参数
character-set-server = utf8
这样就OK了，
mysql> show variables like '%char%';
+--------------------------+----------------------------------+
| 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/local/mysql/share/charsets/ |
+--------------------------+----------------------------------+
8 rows in set (0.00 sec)
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