JTable不會重新刷新/刷新數據插入到mysql

Question

我不知道我在做什麼錯，但我從MySQL數據庫獲取數據並使用DefaultTableModel填充JTable。然後我在屏幕上顯示它。數據從文本框添加到數據庫後，JTable不會刷新。我檢查了數據庫，並插入數據在那裏。我試着用table.repaint()或dTableModel.fireTableDataChanged()在事件監聽器中添加按鈕，但仍然沒有。下面是代碼：

public class DbTable { 

    private JLabel lFirstName, lLastName, lState, lBirthDate; 
    private JTextField fFirstName, tLastName, tState, tBirthDate; 
    private JButton btnAdd; 
    private Object[][] databaseResults; 
    private Object[] columns = { "Col 1", "Col 2", "Col 3", "Col 4", 
      "Col 5", "ЈCol 6", "Col 7" }; 
    private ResultSet rows; 
    private ResultSet rowsCb; 

    private JComboBox combobox; 


    private DefaultTableModel dTableModel = new DefaultTableModel(
      databaseResults, columns) { 
     public Class getColumnClass(int column) { 
      Class returnValue; 

      if ((column >= 0) && (column < getColumnCount())) { 
       returnValue = getValueAt(0, column).getClass(); 
      } else { 
       returnValue = Object.class; 
      } 
      return returnValue; 
     } 
    }; 

    private JTable table = new JTable(dTableModel); 
    Connection conn = null; 
    public static void main(String[] args) { 
     DbTable dbTable = new DbTable(); 

     dbTable.getTable(); 
    } 

    public void getTable() { 
     JFrame frame = new JFrame(); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 



     try { 
      Class.forName("com.mysql.jdbc.Driver"); 

      conn = DriverManager.getConnection(
        "jdbc:mysql://localhost/database", "root", ""); 

      Statement sqlState = conn.createStatement(
        ResultSet.TYPE_SCROLL_SENSITIVE, 
        ResultSet.CONCUR_UPDATABLE); 

      String selectStuff = "SELECT `invoice`.`id` , `client`, `date`, `project`, `amount`,`unitPrice`, `total`" 
        + "FROM `invoice` , `clients`" 
        + "WHERE `invoice`.`clientID` = `clients`.`id`" 
        + "ORDER BY `invoice`.`id` ASC "; 

      rows = sqlState.executeQuery(selectStuff); 

      Object[] tempRow; 

      while (rows.next()) { 
       tempRow = new Object[] { rows.getInt(1), rows.getString(2), 
         rows.getString(3), rows.getString(4), rows.getInt(5), 
         rows.getInt(6), rows.getDouble(7) }; 
       dTableModel.addRow(tempRow); 

      } 

     } catch (SQLException e) { 
      e.getMessage(); 
     } catch (ClassNotFoundException e) { 
      e.getMessage(); 
     } 

     table.setFont(new Font("Tahoma", Font.PLAIN, 14)); 
     table.setAutoCreateRowSorter(true); 

     JScrollPane scrollPane = new JScrollPane(table); 
     // frame.add(combobox, BorderLayout.NORTH); 

     frame.add(scrollPane, BorderLayout.NORTH); 
     // Define values for my labels 
     lFirstName = new JLabel("Klijent ID: "); 
     lLastName = new JLabel("Datum: "); 
     lState = new JLabel("Projekat: "); 
     lBirthDate = new JLabel("Ukupno"); // Define the size of text fields 
     fFirstName = new JTextField(10); 
     tLastName = new JTextField(10); 
     tBirthDate = new JTextField(10); 
     tState = new JTextField(10); 
     btnAdd = new JButton("Add"); 

     btnAdd.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent arg0) { 
       String sDatum = "", sProjekat = ""; 
       int sKlijenId; 
       double sUkupno = 0.00; 
       sKlijenId = Integer.parseInt(fFirstName.getText()); 
       sDatum = tLastName.getText(); 
       sProjekat = tState.getText(); 
       sUkupno = Double.parseDouble(tBirthDate.getText()); 

       try { 
        Class.forName("com.mysql.jdbc.Driver"); 

        conn = DriverManager.getConnection(
          "jdbc:mysql://localhost/sjajplusz", "root", ""); 

        Statement sqlState = conn.createStatement(
          ResultSet.TYPE_SCROLL_SENSITIVE, 
          ResultSet.CONCUR_UPDATABLE); 

        String selectStuff = "SELECT * FROM invoice"; 

        rows = sqlState.executeQuery(selectStuff); 

        rows.moveToInsertRow(); 
        rows.updateInt("clientID", sKlijenId); 
        rows.updateString("date", sDatum); 
        rows.updateString("project", sProjekat); 
        rows.updateDouble("total", sUkupno); 

        rows.insertRow(); 
        rows.updateRow(); 

       } catch (SQLException e1) { 
        e1.getMessage(); 
       } catch (ClassNotFoundException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 

       int invoiceId = 0; 

       try { 
        rows.last(); 
        invoiceId = rows.getInt(1); 
       } catch (SQLException e) { 
        e.getMessage(); 
       } 


//    Object[] invoice = {invoiceId, sKlijenId, sDatum, sProjekat, "", "", sUkupno}; 
//    
//    dTableModel.addRow(invoice); 

       dTableModel.fireTableDataChanged(); 

      } 
     }); 

     JPanel inputPanel = new JPanel(); // Put components in the panel 
     inputPanel.add(lFirstName); 
     inputPanel.add(fFirstName); 
     inputPanel.add(lLastName); 
     inputPanel.add(tLastName); 
     inputPanel.add(lState); 
     inputPanel.add(tState); 
     inputPanel.add(lBirthDate); 
     inputPanel.add(tBirthDate); 
     inputPanel.add(btnAdd); 

     frame.add(inputPanel, BorderLayout.SOUTH); 

     // frame.add(scrollPane, BorderLayout.CENTER); 
     frame.setSize(500, 400); 
     frame.setVisible(true); 

     try { 
      conn.close(); 
     } catch (SQLException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 
    } 
} 

基本上這是跟進此YouTube系列Java JTable 38

Answer 1

你是不是從數據庫中重新加載數據。將數據添加到數據庫後，您必須重新加載數據，請刷新您的DefaultTableModel，然後致電fireTableDataChanged()。您只需要在getTable()方法中執行此操作。您必須提取加載數據的代碼並在您的動作偵聽器中調用它。

Btw。即使您插入數據的方式有點複雜，您的代碼組織也不是很好。我會建議採取一些基本的教程。