java在Jtable netbeans中显示MS访问数据

Question

我试图在netbeans上的jtable中显示我的db，但我的表单只是一片空白

这是我使用的代码，也找不到ConnectionDB

public class BuyingScreen extends javax.swing.JFrame {

Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;



FlyKitemain fk = new FlyKitemain();

private void UpdateJTable(){
    String sql = "Select * From tblKites";

    try{
        pst = conn.prepareStatement(sql);
        rs = pst.executeQuery();
        BuyingTable.setModel(DbUtils.resultSetToTableModel(rs));
}

      catch (SQLException ex)
    {
        Logger.getLogger(BuyingScreen.class.getName()).log(Level.SEVERE, null, ex);
    }

}


private void formWindowOpened(java.awt.event.WindowEvent evt){

    conn = FlyKitemain.ConnectDB();
    UpdateJTable();
}