一对多自身关联双向映射 (一)

[java]
SPAN style="COLOR: #cc0000; FONT-SIZE: 14px">一个一对多双向自身关联映射案例

一个一对多双向自身关联映射案例[java] view plaincopyprint < xml version="1.0" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

< xml version="1.0" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">













[java]
package com.bjpowernode.hibernate;
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 parentCategory;
private Set childCategory = new HashSet();
public Integer getId() {
return id;
}
private void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Category getParentCategory() {
return parentCategory;
}
public void setParentCategory(Category parentCategory) {
this.parentCategory = parentCategory;
}
public Set getChildCategory() {
return childCategory;
}
public void setChildCategory(Set childCategory) {
this.childCategory = childCategory;
}
}

package com.bjpowernode.hibernate;
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 parentCategory;
private Set childCategory = new HashSet();
public Integer getId() {
return id;
}
private void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Category getParentCategory() {
return parentCategory;
}
public void setParentCategory(Category parentCategory) {
this.parentCategory = parentCategory;
}
public Set getChildCategory() {
return childCategory;
}
public void setChildCategory(Set childCategory) {
this.childCategory = childCategory;
}
}
工具类

[java]
package com.bjpowernode.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {

private static SessionFactory factory;

static {
try {
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();

//建立SessionFactory
factory = cfg.buildSessionFactory();
}catch(Exception e) {
e.printStackTrace();
}
}

public static Session getSession() {
return factory.openSession();
}

public static void closeSession(Session session) {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}

public static SessionFactory getSessionFactory() {
return factory;
}
}

package com.bjpowernode.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {