<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.bjpowernode.hibernate.Area" table="t_area">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<many-to-one name="parent" column="pid"/> //外键和下面chidren的外键一样<set name="children" lazy="extra" inverse="true"><key column="pid"/> //外键<one-to-many class="com.bjpowernode.hibernate.Area"/> //表示many的这端的类型是Area</set>
</class>
</hibernate-mapping>
比如
1地区null2广东13广州2 上面的
<many-to-one name="parent" column="pid"/> //外键和下面chidren的外键一样<set name="children" lazy="extra" inverse="true"><key column="pid"/> //外键<one-to-many class="com.bjpowernode.hibernate.Area"/> //表示many的这端的类型是Area</set>
pid即是parent的外键，又是children的外键用来，理解这个很重要
转载于:https://www.cnblogs.com/java20130725/archive/2012/04/08/3215784.html
