Lazy Loading
(Load&Get)
http://blog.youkuaiyun.com/nickcen/archive/2007/07/13/1688376.aspx
Hibernate缓存机制
http://www.iteye.com/topic/249465
hibernate二级缓存攻略
http://www.iteye.com/topic/18904
为什么不用SQL,而用HQL
http://i-proving.ca/space/Technologies/Hibernate/SQL+vs+HQL+with+the+Session+Cache