http://blog.csdn.net/oneyearlater/article/details/7364213
http://blog.csdn.net/oneyearlater/article/details/7364434
http://www.pksafe.cn/blog/1062.html
http://hi.baidu.com/%CA%AB%D5%B9/blog/category/mysql%D4%AD%C0%ED%CA%B5%CF%D6