Hibernate 单向一对多

package model;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
//产品分类表
public class Category implements Serializable {

 private static final long serialVersionUID = 1L;
 
 private Integer id;
 private String name;
    private String description;
    private Set<Product> products=new HashSet<Product>();
   
    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 String getDescription() {
  return description;
 }

 public void setDescription(String description) {
  this.description = description;
 }

 public Set<Product> getProducts() {
  return products;
 }

 public void setProducts(Set<Product> products) {
  this.products = products;
 }
    
   
}

 

Category.hbm.xml如下:

<?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="model.Category" table="category">
  <id name="id" type="java.lang.Integer">
   <column name="ID" precision="8"></column>
   <generator class="increment"></generator>
  </id>
  <property name="name" column="name" length="40" type="java.lang.String"></property>
  <property name="description" column="description" length="200" type="java.lang.String"></property>
  <set name="products" lazy="false" cascade="save-update,delete">
   <key column="CATEGORY_ID"></key>
   <one-to-many class="model.Product"/>
  </set>
 </class>
</hibernate-mapping>

package model;

import java.io.Serializable;
//产品表
public class Product implements Serializable {

 private static final long serialVersionUID = 1L;
 
 private Integer id;
 private String name;
 private Double price;
 private String description;
 //private Category category;
 
 public Product(){
  
 }

 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 Double getPrice() {
  return price;
 }

 public void setPrice(Double price) {
  this.price = price;
 }

 public String getDescription() {
  return description;
 }

 public void setDescription(String description) {
  this.description = description;
 }

 

}

Product.hbm.xml如下:

<?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="model.Product" table="product" >
  <id name="id" type="java.lang.Integer">
   <column name="ID" precision="8"></column>
   <generator class="increment"></generator>
  </id>
  <property name="name" column="name" length="200" type="java.lang.String"></property>
  <property name="price" column="price" precision="8" type="java.lang.Double"></property>
  <property name="description" column="description" length="2000" type="java.lang.String"></property>
  
 </class>
</hibernate-mapping>