Hibernate多对一单向关联

在多方关联一方

Product(多方)(部分代码)

public class Product {
	
	private int id;
	private String name;
	private Double price;
	private Category category;

 Category(一方什么都不关联)(部分代码)

public class Category {
	
	private int id;
	private String name;
	private String description;

 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"/>

		<many-to-one name="category" class="com.lbx.model.Category">
			<column name="CATEGORY_ID"></column>
		</many-to-one>
		
	</class>
	
</hibernate-mapping>

 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" />
		
	</class>
	
</hibernate-mapping>