hibernate 多对一单向映射关系

Book类(图书类)：

package com.hc.model;

public class Book {
	private Integer id;			
	private String name;		
	private String author;		
	private Category 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 getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
	public Category getCategory() {
		return category;
	}
	public void setCategory(Category category) {
		this.category = category;
	}
}

Category类(图书类别类，多本图书对应一种类别)：

package com.hc.model;

public class Category {
	private Integer id;			
	private String name;		
	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;
	}
}

Book表：

Category表：

Book映射文件(Book.hbm.xml)：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.hc.model">
	<class name="Book" table="book">
		<!-- 主键 -->
		<id name="id">
			<generator class="native"/>
		</id>
		<!-- 图书名称 -->
		<property name="name" not-null="true" length="200" />
		<!-- 作者 -->
		<property name="author" not-null="true" length="50"/>
		<!-- 多对一关联映射 -->
		<many-to-one name="category" class="Category" cascade="save-update">
			<!-- 映射的字段 -->
			<column name="categoryId"/>
		</many-to-one>
	</class>
</hibernate-mapping>

Category映射文件(Category.hbm.xml):

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.hc.model">
	<class name="Category" table="Category">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name" not-null="true" length="200" />
	</class>
</hibernate-mapping>

测试：

try {
			//获取Session
			session = HibernateUtil.getSession();
			//开启事务
			session.beginTransaction();
			//创建图书类别
			Category category = new Category();
			category.setName("Java类图书");
			//创建一本图书
			Book b1 = new Book();
			b1.setName("Java开发典型模块大全");
			b1.setAuthor("明日科技");
			b1.setCategory(category);
			//创建一本图书
			Book b2 = new Book();
			b2.setName("JSP项目开发全程实录");
			b2.setAuthor("明日科技");
			b2.setCategory(category);
			//保存图书
			session.save(b1);
			session.save(b2);
			//提交事务
			session.getTransaction().commit();
		} catch (Exception e) {
			e.printStackTrace();
			//出错将回滚事务
			session.getTransaction().rollback();
		}finally{
			//关闭Session对象
			HibernateUtil.closeSession();
		}