java - 从数据库(通过 Netbeans)向 jTable 添加数据没有错误，但表消失了

Question

在调试中，数据以某种方式被完全检索并且 resultModel 实际上已经获得了列名和行数据。尽管在搜索后在 Netbeans 中编译和运行时，表消失了，甚至列名也没有显示任何数据。这是代码:

private void search(){
    String[][] rowData = new String[0][4];
    String[] columns = {"appointmentid", "fname", "lname", "registration", "make", "model", "engine", "year", "mileage", "type", "date", "time"};
    resultModel = new DefaultTableModel(rowData,columns);
     add(new JScrollPane(jTable1));

    jTable1 = new JTable(resultModel);

    jTable1.setAutoCreateRowSorter(true); 

     try{
        Model_Customer[] appointment = Controller_ManageCustomer.FindCustomers(Searchtxt.getText());
        resultModel.setRowCount(0);
        for(int i = 0; i < appointment.length; i++)
            resultModel.insertRow(i,new Object[]{appointment[i].GetID(),appointment[i].GetFName(), appointment[i].GetLName(), appointment[i].GetRegistration(), appointment[i].GetMake(), appointment[i].GetModel(), appointment[i].GetEngine(), appointment[i].GetYear(), appointment[i].GetMileage(), appointment[i].GetType(), appointment[i].GetDate(), appointment[i].GetTime()});

    }catch(Exception ex){
        JOptionPane.showMessageDialog(this,ex.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
    }

}
  DefaultTableModel resultModel

Answer 1

可能只是我...但这看起来很可疑...

add(new JScrollPane(jTable1));
jTable1 = new JTable(resultModel);

更不用说，您构建了一个不错的新DefaultTableModel，但实际上并没有将它应用到屏幕上实际显示的任何内容...

尝试更像...

resultModel = new DefaultTableModel(rowData,columns);

 try{
    Model_Customer[] appointment = Controller_ManageCustomer.FindCustomers(Searchtxt.getText());
    resultModel.setRowCount(0);
    for(int i = 0; i < appointment.length; i++) {
        resultModel.insertRow(i,new Object[]{appointment[i].GetID(),appointment[i].GetFName(), appointment[i].GetLName(), appointment[i].GetRegistration(), appointment[i].GetMake(), appointment[i].GetModel(), appointment[i].GetEngine(), appointment[i].GetYear(), appointment[i].GetMileage(), appointment[i].GetType(), appointment[i].GetDate(), appointment[i].GetTime()});
    }

    if (jTable1 == null) {
        jTable1 = new JTable(resultModel);
        add(new JScrollPane(jTable1));
    } else {
        jTable1.setModel(resultModel);
    }

}catch(Exception ex){
    JOptionPane.showMessageDialog(this,ex.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
}

现在，就我个人而言，我会简单地创建 JTable 并将其添加到屏幕上，然后不管它，只要在您想更新时更改 TableModel它的内容...

Swing 使用 MVC 的形式范式，这意味着它将 View 与模型分开，这意味着当您想要更改 JTable 显示的内容( View )时，您只需更改模型...