hibernate的dao层

参考网址：

http://blog.youkuaiyun.com/azheng270/article/details/2232044

https://my.oschina.net/boonya/blog/290587

http://blog.youkuaiyun.com/q547550831/article/details/53437597

http://blog.youkuaiyun.com/lzy331534013/article/details/52890698

http://1194867672-qq-com.iteye.com/blog/1159918

http://blog.youkuaiyun.com/qq183293/article/details/7884127