hmm i dont know if i understood you well
u wrote me that i`m changing some other model.Which other model?? I wrote
another class, this time i extends AbstractTableModel and it looks like this
and the problem is the same:
public class MojaTable extends AbstractTableModel
 {
   Object[][] values = null;
   String[] columnNames = null;
   private int columns = 0;
   private int rows = 0;
   private Integer temp;

   public MojaTable(){
     pobierzDane();
   }
   public void pobierzDane()
   {
     try
      {
        ResultSet r1 = s.executeQuery("select idplyty,nazwa,opis,dostepna
from plyty");
        ResultSetMetaData rsmd = r1.getMetaData();
        columns = rsmd.getColumnCount();
        columnNames = new String[columns];
        for (int i=0;i<columns;i++)
        columnNames[i] = rsmd.getColumnName(i+1);
        ResultSet r2 = s.executeQuery("select count(*) from plyty");
        r2.next();
        rows = r2.getInt(1);
        int n1 = 0;
        values = new Object[columns][rows];
        ResultSet r1a = s.executeQuery("select idplyty,nazwa,opis,dostepna
from plyty");
        while(r1a.next())
        {
          values[0][n1] = temp.toString(r1a.getInt(1));
          values[1][n1] = r1a.getString(2);
          values[2][n1] = r1a.getString(3);
          values[3][n1] = temp.toString(r1a.getInt(4));
          n1++;
        }

        for (int i=0;i<rows;i++)
          for(int j=0;j<columns;j++)
            {
              System.out.print(" "+values[j][i]);
              if(j==3)
                System.out.println("");
            }
      }
      catch(Exception e)
      {
        System.out.println("funkcja pobierz"+e.getMessage());
      }
      this.fireTableDataChanged();
   }
    /**
   * @see javax.swing.table.TableModel#getRowCount()
   */
   public int getRowCount() {
   return rows;
   }

   /**
   * @see javax.swing.table.TableModel#getColumnCount()
   */
   public int getColumnCount() {
   return columns;
   }
   /**
   * @see javax.swing.table.AbstractTableModel#getColumnName(int)
   */
   public String getColumnName(int column) {
   return columnNames[column];
   }

   /**
   * @see javax.swing.table.TableModel#getValueAt(int, int)
   */
   public Object getValueAt(int rowIndex, int columnIndex) {
   return values[columnIndex][rowIndex];
   }
 }

i create object
MojaTable mtm = new MojaTable();
JTable tablica = new JTable(mtm);

and in function usun if i delete row i call function mtm.pobierzDane()
it isn`t the same model i`m changing??what should i do to change the right
one??
thanks for being patient and help