many to one

 
    hibernate.cfg.xml
 
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
        <property name="connection.username">root</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="myeclipse.connection.profile">mysqlCon</property>
        <property name="connection.password">123456</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="show_sql">true</property>
       <property name="hibernate.hbm2ddl.auto">update</property>
    
    	<mapping resource="com/yelang/hibernate/Class.hbm.xml"/>
    	<mapping resource="com/yelang/hibernate/Student.hbm.xml"/>
    </session-factory>

</hibernate-configuration>
  
  HibernateUtils.java 
package com.yelang.hibernate;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class hibernateUtils {
	/**
	 *         sessionFactory  
	 */
	private static SessionFactory sf ;
	
	/**
	 *          sessionFactory 
	 */
	static {
		try {
			sf = new Configuration().configure().buildSessionFactory();
		} catch (HibernateException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 *        session 
	 */
	public static Session  getSession() {
		return sf.openSession();
	}
	
	/**
	 *   Session
	 */
	public static void closeSession(Session session) {
		if(session != null) {
			if(session.isOpen()) {
				session.close();
			}
		}
	}
}
  
 class.java 
package com.yelang.hibernate;

public class Class {
	private int id;
	
	private String name;

	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;
	}
	
}
  
  
Student.java 
package com.yelang.hibernate;

public class Student {
	private int id;
	
	private String stuName;
	
	private Class classer;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getStuName() {
		return stuName;
	}

	public void setStuName(String stuName) {
		this.stuName = stuName;
	}

	public Class getClasser() {
		return classer;
	}

	public void setClasser(Class classer) {
		this.classer = classer;
	}
}
  
  
Class.hbm.xml 
<?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.yelang.hibernate">
	<class name="Class" table="tb_class">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
	</class>
</hibernate-mapping>
  
  
Student.hbm.xml 
<?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.yelang.hibernate">
	<class name="Student" table="tb_student">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="stuName"/>
		<many-to-one name="classer" column="classId" cascade="save-update"/>
	</class>
</hibernate
  
  
TestUser.java 
package com.yelang.hibernate;

import org.hibernate.Session;

import junit.framework.TestCase;

public class StudentTest extends TestCase {
	public void testSave() {
		Session session = null;
		try{
			session = hibernateUtils.getSession();
			session.beginTransaction();
				Class class1 = new Class();
				class1.setName("07   ");
				
				Student student = new Student();
				student.setClasser(class1);
				student.setStuName("###");
				session.save(student);
				
				
				Student student2 = new Student();
				student2.setClasser(class1);
				student2.setStuName("gg");
				session.save(student2);
				
				
			session.getTransaction().commit();
		}catch(Exception e) {
			e.printStackTrace();
			session.getTransaction().rollback();
		}finally {
			hibernateUtils.closeSession(session);
		}
	}
}