Question

我的netbeans桌面应用程序中有一个jtable，我想从数据库中填充它。

我想知道绑定代码以及在插入/删除某些条目后如何刷新表。

我有一个按钮，显示包含jtable的框架，action命令在

之下

 try{ 
     Class.forName("Mydrivername").newInstance();
     Connection con=DriverManager.getConnection(connectionurl,id,password); 
     PreparedStatement ps=(PreparedStatement) con.preparedStatement("select * from datavasetablename");
     ResultSet rs= ps.executeQuery();
     while(rs.next()){
         row[0]= rs.getInt("Id"); 
         row[1]= rs.getString("name"); 
         mytablemodel.addRow(row);
         frame.show();
   }
 } catch(Exception e){

 }

当我第一次显示框架时，一切都很好但是当我隐藏框架并再次显示时，一切都完全消失了。

Answer 1

在每次插入删除中，我都用

重新加载

public Object[][] getDatos() {
    int registros = 0;
    //We first perform the COUNT to know the size of the matrix
    try {
        PreparedStatement pstm = con.getConnection().prepareStatement(""
                + "SELECT count(idDocente) as total FROM docente;");
        ResultSet res = pstm.executeQuery();
        res.next();//registros es igual al numero de materiales en la BD
        registros = res.getInt("total");
        res.close();
    } catch (SQLException e) {
        System.out.println(e);
    }
    //declaramos el tamaño de la matriz[numero de materiales][cantidad de atributos]
    Object[][] fila = new String[registros][6];

    try {
        PreparedStatement pstm = con.getConnection().prepareStatement("SELECT "
                + " codigo,nombre,apaterno,amaterno,telefono,correoElectronico "
                + " FROM docente"
                + " ORDER BY idDocente;");
        ResultSet res = pstm.executeQuery();
        int i = 0;
        while (res.next()) {
            String estCodigo = res.getString("codigo");
            String estNombre = res.getString("nombre");
            String estCantidad = res.getString("apaterno");
            String estDescripcion = res.getString("amaterno");
            String estFecha = res.getString("telefono");
            String estISBN = res.getString("correoElectronico");

            fila[i][0] = estCodigo;
            fila[i][1] = estNombre;
            fila[i][2] = estCantidad;
            fila[i][3] = estDescripcion;
            fila[i][4] = estFecha;
            fila[i][5] = estISBN;
            i++;
        }
        res.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return fila;
}

查看：

private void updateTabla() {
    String[] columNames = {"Code:", "Name:", "Surname:", "Surname", "Cell phone:", "E-mail:"};
    dtMaterial = objCtrl.getDatos();
    DefaultTableModel datos = new DefaultTableModel(dtMaterial, columNames);
    tblMaterial.setModel(datos);
}

Answer 2

据我所知，实例化row对象的代码应该也放在while(rs.next()){语句中，然后才能正常工作。

如果您使用相同的实例，则列表中的所有项目将具有相同的属性。例如：

try{ 
     Class.forName("Mydrivername").newInstance();
     Connection con=DriverManager.getConnection(connectionurl,id,password); 
     PreparedStatement ps=(PreparedStatement) con.preparedStatement("select *    from datavasetablename");
     ResultSet rs= ps.executeQuery();
     while(rs.next())
     {
         row = new YourRowType();// Change this line to the correct type of    the row object
         row[0]= rs.getInt("Id"); 
         row[1]= rs.getString("name"); 
         mytablemodel.addRow(row);
         frame.show();
     }
  }
  catch(Exception e)
  {

  }

如何在jtable中获取数据库数据

2 个答案: