Hibernate多对多双向关联(多对多都很少用，双向都少用)-优快云博客

本文介绍了一个基于Java的订单(Order)与商品(Product)类的设计，包括它们之间的多对多关系及其实现方式。通过使用HashSet来存储相关联的对象，并定义了getter和setter方法以方便操作这些属性。

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Order类

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

public class Order implements Serializable{
	
	private int id;
	private String name;
	private String phone;
	private Set products = new HashSet();
	
	public int getId() {
		return id;
	}
	public String getName() {
		return name;
	}
	public String getPhone() {
		return phone;
	}
	public Set getProducts() {
		return products;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setName(String name) {
		this.name = name;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public void setProducts(Set products) {
		this.products = products;
	}
	
}

Product类
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

/**
 * 具体的商品表(双向的多对多所以此类要关联Order)
 * @author Administrator
 *
 */

public class Product implements Serializable{
	
	private int id;
	private String name;
	private Double price;
	private Set orders = new HashSet();
	
	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 Set getOrders() {
		return orders;
	}
	public void setOrders(Set orders) {
		this.orders = orders;
	}
	
}

Product.hbm.xml文件

<?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 
	package="com.lbx.model">
	
	<class name="Product" table="product" lazy="true">
		
		<id name="id" type="int" column="ID">
			<generator class="increment"/>
		</id>
		
		<property name="name" type="java.lang.String" column="NAME"/>
		
		<property name="price" type="java.lang.Double" column="PRICE"/>

		<set name="orders" table="ORDERITEM">
			<key column="product_id" />
			<many-to-many column="order_id" class="Order" />
		</set>

	</class>
	
</hibernate-mapping>

Order.hbm.xml文件

<?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 
	package="com.lbx.model">
	
	<class name="Order" table="orders" lazy="true">
		
		<id name="id" type="int" column="ID">
			<generator class="increment"/>
		</id>
		
		<property name="name" type="java.lang.String" column="NAME"/>
		
		<property name="phone" type="java.lang.String" column="PHONE"/>
		
		<set name="products" table="ORDERITEM">
			<key column="order_id" />
			<many-to-many class="com.lbx.model.Product" column="product_id"/>
		</set>
		
	</class>
	
</hibernate-mapping>