http://blog.csdn.net/Sunboy_2050/article/details/5131863
http://blog.csdn.net/sunboy_2050/article/details/5134201
http://blog.csdn.net/sunboy_2050/article/details/5130789
http://blog.csdn.net/sunboy_2050/article/details/5130454
原文：http://www.cnblogs.com/Badcode/p/mysql.html