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POUpdating a JTable with database query
 

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  1. POUpdating a JTable with database query
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    <p>The program I am working on contains two classes, GUI &amp; DatabaseHelper. The table model used is DefaultTableModel.</p> <p>The GUI contains consists of a simple JTable. It is initialised with data from the DatabaseHelper on startup. This works.</p> <p>However, when trying to load new data into the table, it is not quite so straight forward. </p> <p>My approach thus far has been:</p> <pre><code>model = DatabaseHelper.LoadData() // returns a default table model with new data. tabel = new JTable(); tabel.setModel(); </code></pre> <p>What happens now is that the loaded data is appended onto the already existing JTable.</p> <p>If it is possible I would like to implement a solution using only the default table model. Thank you for any suggestions!</p> <p>EDIT: </p> <pre><code>public void initGUI(){ setJMenuBar(makeMenuBar()); container = new JPanel(new BorderLayout()); model = db.initialiseTable(); // Load initialisation data from the database table = new JTable(); table.setModel(model); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); table.setFillsViewportHeight(true); scrollPane = new JScrollPane(table); container.add(scrollPane, BorderLayout.CENTER); add(container); } </code></pre> <p>Returning a new model from database:</p> <pre><code>public DefaultTableModel loadData(){ try { Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/version1", "root", "root"); System.out.println("\nDatabase Connection Established.\n"); String query = "SELECT * FROM table WHERE test_number = 2"; stmt = con.createStatement(); rs = stmt.executeQuery( query ); md = rs.getMetaData(); columns = md.getColumnCount(); while (rs.next()) { Vector row = new Vector(columns); for (int i = 1; i &lt;=columns-1; i++){ row.addElement( rs.getObject(i+1) ); } data.addElement( row ); } }catch(SQLException e){ e.printStackTrace(); }catch(ClassNotFoundException e){ e.printStackTrace(); } columnNames.add(" "); columnNames.add("Column 1"); columnNames.add("Column 2"); DefaultTableModel model = new DefaultTableModel(data, columnNames); return model; } </code></pre> <p>ActionPerformed, code handles new model returned from the DatabaseHelper</p> <pre><code> model = new DefaultTableModel(); model = db.loadData(); table = new JTable(); table.setModel(model); </code></pre>
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    1. USJnanathan
    1. USJnanathan
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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