Jtable相同的值问题？

Question

公共类Tablepanel扩展了JPanel {

int row,col;
 JTable table;
 String num;


Tablepanel()
{

    setLayout(new BorderLayout());


    try
    {

        Database d=new Database();
        ResultSet rs = null;

         Connection con = d.con;


        Statement state=null;
        state=con.createStatement();
        String insertsql="select firstname,lastname,phonenumber from contacts";
        rs=state.executeQuery(insertsql);



        java.sql.ResultSetMetaData rsm=rs.getMetaData();
        int numberofcolums=rsm.getColumnCount();

        Vector<String> colums=new Vector<String>(numberofcolums);


        for(int i=1;i<=numberofcolums;i++)
        {
            colums.add(rsm.getColumnName(i));

        }

        Vector<Vector<String>> data=new Vector<Vector<String>>();
        Vector<String> rowdata=new Vector<String>();


        while(rs.next())
        {
            for(int i=1;i<=numberofcolums;i++)
            {
                rowdata.add(rs.getString(i));

            }   

            data.add(rowdata);

        }

        table=new JTable(data, colums);
        table.setSize(200, 200);

        JScrollPane sp=new JScrollPane(table);
        add(sp,BorderLayout.NORTH);

        table.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e)
            {

                 row=table.getSelectedRow();
                 col=table.getSelectedColumn();
                String clcik=(table.getModel().getValueAt(row,col).toString());

                num=clcik;
                String name=setname(num);


            }
        });



        System.out.println(num);


    }catch(Exception ex)
    {

        System.out.println(ex);

    }

}


String setname(String num)
{
    return this.num=num;

}
String getname()
{
    return this.num;

}

嗨，我正在进行项目电话应用，但是当我从数据库中检索数据时，JTable中存在问题Jtable总是给出相同的值，例如
wahab massod 02158956
wahab masood 02158956
wahab massod 02158956
wahab masood 02158956

请帮帮忙？