hibernate 自身多对多

有个类Student，它要自己对自己进行多对多映射

其中Student 类的属性有：

[java] view plaincopy

1. public int id;  
2. public String name;  
3. public String sex;  
4. private Set<Student> children = new HashSet<Student>();  
5. private Set<Student> parent = new HashSet<Student>();  

自身多对多  可以拆成自身一对多

public class ParentS {    private Set<Student> children ;    }    public class Childs {    private Set<Student> parents;    }  

下面是一个完成的自身一对多的列子

package com.zhaozi.entity;import java.io.Serializable;import java.util.HashSet;import java.util.Set;public class Category implements Serializable {    private Integer id;    private String name;    private Category parent;    private Set<Category> children = new HashSet<Category>();        public Category() {    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Category getParent() {        return parent;    }    public void setParent(Category parent) {        this.parent = parent;    }    public Set<Category> getChildren() {        return children;    }    public void setChildren(Set<Category> children) {        this.children = children;    }}

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping SYSTEM "../../../../hibernate-mapping-3.0.dtd" ><hibernate-mapping package="com.zhaozi.entity">  <class name="Category" table="T_CATEGORY">    <id name="id" column="CATEGORY_ID">      <generator class="native"/>    </id>    <property name="name" type="string" column="NAME" length="15"/>    <many-to-one name="parent" column="PARENT_ID" class="Category"/>    <set name="children" cascade="save-update" inverse="true">      <key column="PARENT_ID"/>      <one-to-many class="Category"/>    </set>  </class></hibernate-mapping>