<set name="products" inverse="true" order by="id desc">  <key column="FACTORY"/><one-to-many class="com.hibernate.bean.Product"/></set>

create table Product(
id int primary key auto_increment,
name varchar(200) not null,
price double null,
factory int ,
FOREIGN KEY(factory) REFERENCES factory(factoryid)
)create table factory(
factoryid int primary key auto_increment,
factoryname varchar(200) not null
)

package com.hibernate.bean;public class Factory {private int factoryid;private String factoryname;public int getFactoryid() {return factoryid;}public void setFactoryid(int factoryid) {this.factoryid = factoryid;}public String getFactoryname() {return factoryname;}public void setFactoryname(String factoryname) {this.factoryname = factoryname;}public Factory(int factoryid, String factoryname) {super();this.factoryid = factoryid;this.factoryname = factoryname;}public Factory(){}}

    <class table="FACTORY" name="com.hibernate.bean.Factory" ><id name="factoryid" type="int"><column name="FACTORYID"></column><generator class="identity"></generator></id><property name="factoryname" type="string"><column name="FACTORYNAME"/></property></class>

package com.hibernate.bean;public class Product {private int id;private String name;private double price;private Factory factory;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public Factory getFactory() {return factory;}public void setFactory(Factory factory) {this.factory = factory;}public Product(){}public Product(int id, String name, double price, Factory factory) {super();this.id = id;this.name = name;this.price = price;this.factory = factory;}}

    <class table="PRODUCT" name="com.hibernate.bean.Product" ><id name="id" type="int"><column name="ID"></column><generator class="identity"></generator></id><property name="name" type="string"><column name="NAME"/></property><property name="price" type="double"><column name="PRICE"/></property><!--<property name="factory" type="int"><column name="FACTORY"/></property>--><many-to-one name="factory" class="com.hibernate.bean.Factory"><column name="FACTORY"/> </many-to-one></class>

public static void main(String[] args){Session session=HibernateUtil.getSessionFactory().openSession();session.beginTransaction();Product p=(Product)session.get(Product.class, 1);System.out.println("产品名称："+p.getName()+"\t"+"产品价格："+p.getPrice()+"\t"+"生产商："+p.getFactory().getFactoryname());}

 factory类增加Set的products属性以及其gettersetter方法private Set<Product> products;public void setProducts(Set<Product> products) {this.products = products;}public Set<Product> getProducts() {return products;}
......

        <set name="products" inverse="true">  <!--inserse=true意思是改变  该类的该set集合放弃对关联关系的维护权，  改变set中的内容，在factory类中的update和insert操作不影响数据库，个人表示这是正确的，因为在附表中的set集合本来就是虚构的一个字段，所以里面元素的改变不应该影响数据库中的改变-->   <key column="FACTORY"/><!--注意:column的值是主表的外键名而不是映射文件对应表的主键名-->           <one-to-many class="com.hibernate.bean.Product"/></set>

public static void main(String[] args){Session session=HibernateUtil.getSessionFactory().openSession();Transaction tx=session.beginTransaction();Factory f=(Factory)session.get(Factory.class, 1);System.out.println("编号："+f.getFactoryid()+"\t名称："+f.getFactoryname());Set<Product> s=f.getProducts();Iterator<Product> it=s.iterator();System.out.println("该工厂生产的商品：");while(it.hasNext()){Product p=it.next();System.out.println(p.getName()+"\t"+p.getPrice()+"元");}tx.commit();}