inversedemo.java

hibernate_tutorial经典教程

package tutorial.dev.inverse;

import java.io.Serializable;
import java.util.HashSet;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.cfg.Configuration;

public class InverseDemo {
	public static void main(String[] args) {
		try {
			new InverseDemo();
		} catch(HibernateException he) {
			he.printStackTrace();
		}
	}
	
	public InverseDemo() throws HibernateException {
		Configuration config = new Configuration();
		// add the classes you want to persist
		// make sure the mapping files are on the classpath
		config.addClass(Hotel.class);
		config.addClass(HotelRoom.class);
		
		SessionFactory sf = config.buildSessionFactory();
	
		Session sess = sf.openSession();
		Transaction tx = null;
		// store the orderlist and all products
		Serializable id = null;
		Hotel h = null;
		try {
			tx = sess.beginTransaction();
			h = new Hotel();
			h.setRooms(new HashSet());
			h.setName("Royal");
			h.getRooms().add(new HotelRoom(1));
			h.getRooms().add(new HotelRoom(2));
			h.getRooms().add(new HotelRoom(3));
			h.getRooms().add(new HotelRoom(4));
			
			sess.save(h);
			tx.commit();
		} catch (HibernateException e) {
		    if (tx!=null) tx.rollback();
		    throw e;
		} 
		finally {
		    sess.close();
		}

		sess = sf.openSession();
		// store the orderlist and all products
		try {
			tx = sess.beginTransaction();
		
			h = (Hotel)sess.get(Hotel.class, h.getId());
			System.out.println("Found hotel: " + h.getName() +" with " + h.getRooms().size() +" rooms");
			tx.commit();
		} catch (HibernateException e) {
		    if (tx!=null) tx.rollback();
		    throw e;
		} 
		finally {
		    sess.close();
		}
	}	
}