Hibernate多对多单向关联

最新推荐文章于 2025-12-29 16:24:28 发布

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本文介绍了一个简单的Order和Product类设计，通过Hibernate框架实现了一种单向的多对多关系映射。Order类包含一个指向Product集合的引用，而Product类则不包含指向Order的引用。

Order类定义一个 Set products = new HashSet(); 用于建立Order和Product之间的关联（单向的）

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, 什麽都不关联

/**
 * 具体的商品表(单向的多对多所以此类不关联Order)
 * @author Administrator
 *
 */

public class Product implements Serializable{
	
	private int id;
	private String name;
	private Double price;
	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;
	}
	
}

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="ORDERRITEM">
			<key column="order_id" />
			<many-to-many class="com.lbx.model.Product" column="product_id"/>
		</set>
		
	</class>
	
</hibernate-mapping>

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"/>

	</class>
	
</hibernate-mapping>