Question

我使用Netbeans设计JFrame。使用Cardlayout我在ParentPanel中创建了两个JFrame。如果按下按钮，我想在面板之间切换。

    MotherPanel.removeAll();
    MotherPanel.add(detailPanel);
    MotherPanel.repaint();
    MotherPanel.revalidate();

    detail();

方法detail（）访问数据库中的表并将特定值设置为Jtextfields。

public void detail(){
    doConnect();
    setTitle(cur_categ);
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);        
}
public void connection() throws SQLException{
    stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, 
                ResultSet.CONCUR_UPDATABLE);
    String SQL = String.format("SELECT * FROM %s", cur_categ);
    rs_det = stmt.executeQuery(SQL);
}

public void doConnect(){

    try{
        //Connect to the database
        String host = "jdbc:derby://localhost:1527/Employees";
        String userName = "App";
        String pass = " ";
        con = DriverManager.getConnection(host, userName, pass);
        connection();


        //Move the cursor to the first record and get the data if there is any
        if (rs_det.next()){                
            double exp_dou = rs_det.getDouble("Expense");
            String exp = Double.toString(exp_dou);             
            String desc = rs_det.getString("Description");
            String date = rs_det.getString("Date");

         //Display the records in the text fields
         textExpense1.setText(exp);
         textDescription.setText(desc);
         textDate.setText(date);               
        }                          
    }

    catch ( SQLException err ){
        JOptionPane.showMessageDialog(this, err.getMessage());
    }  
}

数据库中有几个表，第二帧访问，这取决于第一个Jpanel中jtable中选择的行。我可以打开第二个Jpanel，但是当它使用数据库中的值访问表时我无法重新打开它。但是，如果表中没有值，我可以重新打开第二个Jpanel。我该如何解决？

在Netbeans中切换JFrame

0 个答案: