JPA

http://77857.blog.51cto.com/67857/158996

 

http://www.cnblogs.com/holbrook/archive/2012/12/30/2839842.html

 

http://blog.csdn.net/chjttony/article/details/6086298

 

Entity 生命周期

http://evil850209.iteye.com/blog/1932070