1.Book类和Category类

package cn.siggy.pojo;import java.util.Date;import javax.persistence.CascadeType;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.Table;//entity表示需要持久化的实体类@Entity//实体类 所对应的表@Tablepublic class Book {	//id主键	@Id	//指定 主键生成策略	@GeneratedValue(strategy=GenerationType.AUTO)	private int id;	private String name;	private double price;	private String author;	private Date pubDate;	@ManyToOne(cascade=CascadeType.ALL)	@JoinColumn(name="category_id")	private Category category;	/*get/set*/}

===========================package cn.siggy.pojo;import java.util.HashSet;import java.util.Set;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.OneToMany;import javax.persistence.Table;@Entity@Tablepublic class Category {	@Id	@GeneratedValue(strategy=GenerationType.AUTO)	private int id;	private String name;	@OneToMany(mappedBy="category")	private Set
     
       books = new HashSet
      
       ();	/*get/set*/}
      
     

　　

2.Hibernate.cfg.xml

     
      	
       	
       
        		com.mysql.jdbc.Driver	
       	
       
        jdbc:mysql:///hibernate4
       	
       
        root
       	
       
        root
       	
       	
       
        		org.hibernate.dialect.MySQLDialect	
       	
       
        true
       	
       
        true
       	
       
        update
       	
       	
       	
       
      
     

　　

3.测试代码

package cn.siggy.test;import java.util.Date;import org.hibernate.Session;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.hibernate.tool.hbm2ddl.SchemaExport;import org.junit.Test;import cn.siggy.pojo.Book;import cn.siggy.pojo.Category;import cn.siggy.util.HibernateUtil;public class HibernateTest {	@Test	public void testCreateDB(){		//3.x		//Configuration cfg = new AnnotationConfiguration().configure();		Configuration cfg = new Configuration().configure();		SchemaExport se = new SchemaExport(cfg);		se.create(true, true);	}	@Test	public void testSave(){		Session session = HibernateUtil.getSession();		Book book = new Book();		book.setName("丰乳肥臀");		book.setPrice(60.5);		book.setAuthor("莫言");		book.setPubDate(new Date());				Category category = new Category();		category.setName("文学");		book.setCategory(category);		Transaction tx = session.beginTransaction();		session.save(book);		tx.commit();		HibernateUtil.closeSession();	}	@Test	public void testGet(){		Session session = HibernateUtil.getSession();		Transaction tx = session.beginTransaction();		Book book = (Book)session.get(Book.class, 1);		System.out.println(book.getName()+"---"+book.getCategory().getName());				tx.commit();		HibernateUtil.closeSession();	}}