Fetch data from database into Jtextfield when One Jtextfield is Typed

Question

Hi Guys I have a Swing Application that is connected to an oracle database, I want it such that Once I type a Value into the JTextField, the other JTextfields on the JFrame

Answer 1

Both Robin and Nick are right.

Here's an example of how to implement what they are discussing...

public class TestForm02 {

    public static void main(String[] args) {
        new TestForm02();
    }

    public TestForm02() {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {

                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setLayout(new BorderLayout());
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new MyForm());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

            }
        });
    }

    protected class MyForm extends JPanel {

        private JTextField txtNo;
        private JTextField txtName;
        private String partToLoad;
        private Timer loadTimer;

        public MyForm() {

            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.insets = new Insets(2, 2, 2, 2);
            gbc.anchor = GridBagConstraints.WEST;

            txtName = new JTextField(12);
            txtNo = new JTextField(12);
            txtName.setEnabled(false);

            add(new JLabel("Parts #:"), gbc);
            gbc.gridx++;
            add(txtNo, gbc);

            gbc.gridy++;
            gbc.gridx = 0;
            add(new JLabel("Description:"), gbc);
            gbc.gridx++;
            add(txtName, gbc);

            txtNo.addFocusListener(new FocusAdapter() {
                @Override
                public void focusLost(FocusEvent e) {
                    loadParts();
                }
            });

            txtNo.getDocument().addDocumentListener(new DocumentListener() {
                protected void update() {
                    loadTimer.restart();
                }

                @Override
                public void insertUpdate(DocumentEvent e) {
                    update();
                }

                @Override
                public void removeUpdate(DocumentEvent e) {
                    update();
                }

                @Override
                public void changedUpdate(DocumentEvent e) {
                    update();
                }
            });

            loadTimer = new Timer(250, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    loadParts();
                }
            });
            loadTimer.setRepeats(false);
            loadTimer.setCoalesce(true);

        }

        protected void loadParts() {

            String text = txtNo.getText();
            // Don't want to trigger this twice...
            if (text == null ? partToLoad != null : !text.equals(partToLoad)) {
                partToLoad = text;
                txtNo.setEnabled(false);
                txtName.setEnabled(false);
                BackgroundWorker worker = new BackgroundWorker();
                worker.execute();
            }

        }

        protected class BackgroundWorker extends SwingWorker {

            @Override
            protected String doInBackground() throws Exception {

                // Do you're database load here.  Rather then updating the text
                // field, assign it to variable and return it from here

                String desc = "Some description"; // load me :D

                // Inserted delay for simulation...
                Thread.sleep(2000);

                return desc;

            }

            @Override
            protected void done() {
                try {
                    String value = get();
                    txtName.setText(value);

                    txtName.setEnabled(true);
                    txtNo.setEnabled(true);
                } catch (InterruptedException exp) {
                    exp.printStackTrace(); // Log these some where useful
                } catch (ExecutionException exp) {
                    exp.printStackTrace(); // Log these some where useful
                }
            }
        }
    }
}