querytest2.java

Hiberante程序高手秘籍的源代码

package com.oreilly.hh;

import net.sf.hibernate.*;
import net.sf.hibernate.cfg.Configuration;

import java.sql.Time;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * Provide a user interface to enter artist names and see their tracks.
 */
public class QueryTest2 extends JPanel {

    JList list;  // Will contain tracks associated with current artist
    DefaultListModel model; // Lets us manipulate the list contents

    /**
     * Build the panel containing UI elements
     */
    public QueryTest2() {
        setLayout(new BorderLayout());
        model = new DefaultListModel();
        list = new JList(model);
        add(new JScrollPane(list), BorderLayout.SOUTH);

        final JTextField artistField = new JTextField(30);
        artistField.addKeyListener(new KeyAdapter() {
                public void keyTyped(KeyEvent e) {
                    SwingUtilities.invokeLater(new Runnable() {
                            public void run() {
                                updateTracks(artistField.getText());
                            }
                        });
                }
            });
        add(artistField, BorderLayout.EAST);
        add(new JLabel("Artist: "), BorderLayout.WEST);
    }

    /**
     * Update the list to contain the tracks associated with an artist
     */
    private void updateTracks(String name) {
        model.removeAllElements();  // Clear out previous tracks
        if (name.length() < 1) return;   // Nothing to do
        try {
            // Ask for a session using the JDBC information we've configured
            Session session = sessionFactory.openSession();
            try {
                Artist artist = CreateTest.getArtist(name, false, session);
                if (artist == null) {  // Unknown artist
                    model.addElement("Artist not found");
                    return;
                }
                // List the tracks associated with the artist
                for (Iterator iter = artist.getTracks().iterator() ;
                     iter.hasNext() ; ) {
                    Track aTrack = (Track)iter.next();
                    model.addElement("Track: \"" + aTrack.getTitle() +
                                     "\", " + aTrack.getPlayTime());
                }
            } finally {
                // No matter what, close the session
                session.close();
            }
        } catch (Exception e) {
            System.err.println("Problem updating tracks:" + e);
            e.printStackTrace();
        }
    }

    private static SessionFactory sessionFactory;  // Used to talk to Hibernate

    /**
     * Set up Hibernate, then build and display the user interface.
     */
    public static void main(String args[]) throws Exception {
        // Load configuration properties, read mappings for persistent classes.
        Configuration config = new Configuration();
        config.addClass(Track.class).addClass(Artist.class);

        // Get the session factory we can use for persistence
        sessionFactory = config.buildSessionFactory();

        // Set up the UI
        JFrame frame = new JFrame("Artist Track Lookup");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new QueryTest2());
        frame.setSize(400, 180);
        frame.setVisible(true);
    }
}