Hibernate一对多单向关联

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本文介绍了使用Java和Hibernate实现的商品分类(Category)与具体商品(Product)的表设计及关联关系。Category类作为一方，维护了一个包含多个产品的集合，而Product类作为多方并不直接关联Category。通过Category.hbm.xml和Product.hbm.xml配置文件详细展示了如何映射这些类到数据库表。

Category类（一方）

import java.util.HashSet;
import java.util.Set;

/**
 * 商品分类表
 * @author Administrator
 *
 */

public class Category {
	
	private int id;
	private String name;
	private String description;
	private Set product = 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 String getDescription() {
		return description;
	}
	public void setDescription(String description) {
		this.description = description;
	}
	public Set getProduct() {
		return product;
	}
	public void setProduct(Set product) {
		this.product = product;
	}
	
}

Product类（多方）

/**
 * 具体的商品表(单向的一对多所以此类不关联Category)
 * @author Administrator
 *
 */

public class Product {
	
	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;
	}
	
}

Category.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="Category" table="category" lazy="true">
		
		<id name="id" type="int" column="ID">
			<generator class="increment"/>
		</id>
		
		<property name="name" type="java.lang.String" column="NAME"/>
		
		<property name="description" type="java.lang.String" />
		
		<set name="product" >
			<key column="category_id" />
			<one-to-many class="com.lbx.model.Product"/>
		</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>