http://dev.mysql.com/doc/refman/5.1/zh/database-administration.html#privileges-provided
http://www.moon-soft.com/program/book/mysql/manual_Privilege_system.html
http://hi.baidu.com/jcommunity/blog/category/mysql%D3%C3%BB%A7%B9%DC%C0%ED
http://blog.chinaunix.net/u2/71257/showart_1915421.html