inheritancedemo.java

hibernate_tutorial经典教程

package tutorial.inheritance.tablepersubclass;

import java.util.Iterator;
import java.util.List;

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 InheritanceDemo {
	public static void main(String[] args) {
		try {
			new InheritanceDemo();
		} catch(HibernateException he) {
			he.printStackTrace();
		}
	}
	
	public InheritanceDemo() throws HibernateException {
		Configuration config = new Configuration();
		// add the classes you want to persist
		// make sure the mapping files are on the classpath
		config.addClass(Payment.class);
		
		SessionFactory sf = config.buildSessionFactory();
		
		Session sess = sf.openSession();
		Transaction tx = null;
		try {
			tx = sess.beginTransaction();
			
			CashPayment cash = new CashPayment();
			cash.setAmount(new Double(100.55));
			cash.setSomething("foo bar baz");
			sess.save(cash);
			
			CreditcardPayment credit = new CreditcardPayment();
			credit.setAmount(new Double(546.4));
			credit.setCardNumber("1234-5678-1234-5678");
			sess.save(credit);
			
			tx.commit();
		} catch (HibernateException e) {
		    if (tx!=null) tx.rollback();
		    throw e;
		}
		finally {
		    sess.close();
		}
		
		
		
		sess = sf.openSession();
		tx = null;
		try {
		    tx = sess.beginTransaction();
		   
		    List pets = sess.find("from " + Payment.class.getName());
		    
		    for (Iterator it = pets.iterator(); it.hasNext();) {
				Payment payment = (Payment) it.next();
				System.out.println(	"Payment amount " + payment.getAmount() +
									" its class is: " + payment.getClass().getName());
			}
		    
		    
		    tx.commit();
		}
		catch (HibernateException e) {
		    if (tx!=null) tx.rollback();
		    throw e;
		}
		finally {
		    sess.close();
		}
	}
}