目录1. 递归查询2. 闭包表对于mysql查android询树形结构，可以使用递归查询或者闭包表来实现。以下是两种常用的方法：
Today I was reading through some Hibernate code and I encounter something interesting. There is a class called CollectionHelper that defines the following constant varibale:
加载中,请稍侯......