Hallo liebes Forum,
warum zeigt mein JTable die Daten aus meiner Datenbank nicht an? Der Header wird ausgegeben, aber der Rest nicht.
warum zeigt mein JTable die Daten aus meiner Datenbank nicht an? Der Header wird ausgegeben, aber der Rest nicht.
Java:
package DB;
import java.awt.event.KeyEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Event;
import java.awt.BorderLayout;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.KeyStroke;
import java.awt.Point;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JFrame;
import javax.swing.JDialog;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class Oberflaeche {
private JFrame jFrame = null;
private JPanel jContentPane = null;
private JMenuBar jJMenuBar = null;
private JMenu fileMenu = null;
private JMenu editMenu = null;
private JMenu helpMenu = null;
private JMenuItem aboutMenuItem = null;
private JMenuItem cutMenuItem = null;
private JMenuItem copyMenuItem = null;
private JMenuItem pasteMenuItem = null;
private JMenuItem saveMenuItem = null;
private JDialog aboutDialog = null;
private JPanel aboutContentPane = null;
private JLabel aboutVersionLabel = null;
private JTable jTable = null;
static Connection con = null;
static DefaultTableModel aModel = new DefaultTableModel();
/**
* This method initializes jFrame
*
* @return javax.swing.JFrame
*/
private JFrame getJFrame() {
if (jFrame == null) {
jFrame = new JFrame();
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setJMenuBar(getJJMenuBar());
jFrame.setSize(300, 200);
jFrame.setContentPane(getJContentPane());
jFrame.setTitle("Application");
}
return jFrame;
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(new JScrollPane(getJTable()), BorderLayout.CENTER);
}
return jContentPane;
}
/**
* This method initializes jJMenuBar
*
* @return javax.swing.JMenuBar
*/
private JMenuBar getJJMenuBar() {
if (jJMenuBar == null) {
jJMenuBar = new JMenuBar();
jJMenuBar.add(getFileMenu());
jJMenuBar.add(getEditMenu());
jJMenuBar.add(getHelpMenu());
}
return jJMenuBar;
}
/**
* This method initializes jMenu
*
* @return javax.swing.JMenu
*/
private JMenu getFileMenu() {
if (fileMenu == null) {
fileMenu = new JMenu();
fileMenu.setText("Beenden");
fileMenu.add(getSaveMenuItem());
}
return fileMenu;
}
/**
* This method initializes jMenu
*
* @return javax.swing.JMenu
*/
private JMenu getEditMenu() {
if (editMenu == null) {
editMenu = new JMenu();
editMenu.setText("Bearbeiten");
editMenu.add(getCutMenuItem());
editMenu.add(getCopyMenuItem());
editMenu.add(getPasteMenuItem());
}
return editMenu;
}
/**
* This method initializes jMenu
*
* @return javax.swing.JMenu
*/
private JMenu getHelpMenu() {
if (helpMenu == null) {
helpMenu = new JMenu();
helpMenu.setText("Help");
helpMenu.add(getAboutMenuItem());
}
return helpMenu;
}
/**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getAboutMenuItem() {
if (aboutMenuItem == null) {
aboutMenuItem = new JMenuItem();
aboutMenuItem.setText("About");
aboutMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JDialog aboutDialog = getAboutDialog();
aboutDialog.pack();
Point loc = getJFrame().getLocation();
loc.translate(20, 20);
aboutDialog.setLocation(loc);
aboutDialog.setVisible(true);
}
});
}
return aboutMenuItem;
}
/**
* This method initializes aboutDialog
*
* @return javax.swing.JDialog
*/
private JDialog getAboutDialog() {
if (aboutDialog == null) {
aboutDialog = new JDialog(getJFrame(), true);
aboutDialog.setTitle("About");
aboutDialog.setContentPane(getAboutContentPane());
}
return aboutDialog;
}
/**
* This method initializes aboutContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getAboutContentPane() {
if (aboutContentPane == null) {
aboutContentPane = new JPanel();
aboutContentPane.setLayout(new BorderLayout());
aboutContentPane.add(getAboutVersionLabel(), BorderLayout.CENTER);
}
return aboutContentPane;
}
/**
* This method initializes aboutVersionLabel
*
* @return javax.swing.JLabel
*/
private JLabel getAboutVersionLabel() {
if (aboutVersionLabel == null) {
aboutVersionLabel = new JLabel();
aboutVersionLabel.setText("Version 1.0");
aboutVersionLabel.setHorizontalAlignment(SwingConstants.CENTER);
}
return aboutVersionLabel;
}
/**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCutMenuItem() {
if (cutMenuItem == null) {
cutMenuItem = new JMenuItem();
cutMenuItem.setText("Anzeigen");
cutMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,
Event.CTRL_MASK, true));
}
cutMenuItem.addActionListener(new ActionListener() {
@Override public void actionPerformed( ActionEvent e ) {
try{
Statement stmt = con.createStatement();
String query = "SELECT * FROM Gastronomie";
ResultSet rs = stmt.executeQuery( query );
ResultSetMetaData rsmd = rs.getMetaData();
int col = rsmd.getColumnCount();
String[] columnnames = new String[col];
// DefaultTableModel aModel = (DefaultTableModel) jTable.getModel();
for (int i = 1; i <= col; i++)
{
System.out.print(rsmd.getColumnName(i) + "\t\t");
columnnames[i-1]=rsmd.getColumnName(i);
}
System.out.print("\n");
Vector data = new Vector();
aModel.setColumnIdentifiers(columnnames);
// Ergebnisse anzeigen
while (rs.next())
{
Object[] objects = new Object[col];
for (int i = 1; i <= col; i++)
{
System.out.print(rs.getObject(i) + "\t\t");
objects[i]=rs.getObject(i + 1);
}
System.out.print("\n");
aModel.addRow(objects);
}
jTable.setModel(aModel);
rs.close();
stmt.close();
con.close();
} catch (SQLException e1) {
// Could not connect to the database
} }
});
return cutMenuItem;
}
/**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCopyMenuItem() {
if (copyMenuItem == null) {
copyMenuItem = new JMenuItem();
copyMenuItem.setText("Suchen");
copyMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
Event.CTRL_MASK, true));
}
return copyMenuItem;
}
/**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getPasteMenuItem() {
if (pasteMenuItem == null) {
pasteMenuItem = new JMenuItem();
pasteMenuItem.setText("Einfügen");
pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,
Event.CTRL_MASK, true));
}
return pasteMenuItem;
}
/**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getSaveMenuItem() {
if (saveMenuItem == null) {
saveMenuItem = new JMenuItem();
saveMenuItem.setText("Beenden");
saveMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
Event.CTRL_MASK, true));
}
saveMenuItem.addActionListener(new ActionListener() {
@Override public void actionPerformed( ActionEvent e ) {
System.exit(0);
}
});
return saveMenuItem;
}
/**
* This method initializes jTable
*
* @return javax.swing.JTable
*/
private JTable getJTable() {
if (jTable == null) {
jTable = new JTable(aModel);
jTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
}
return jTable;
}
/**
* Launches this application
*/
public static void main(String[] args) throws SQLException {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Oberflaeche application = new Oberflaeche();
application.getJFrame().setVisible(true);
}
});
try {
// Load the JDBC driver
String driverName = "oracle.jdbc.driver.OracleDriver";
Class.forName(driverName);
// Create a connection to the database
String serverName = "******";
String portNumber = "******";
String sid = "oradb";
String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
String username = "*******";
String password = "*******";
con = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
// Could not find the database driver
}
}
}
