public   void  setValueAt(Object value,  int  row,  int  column) {
         try  {
            String tableName = metaData.getTableName(column+ 1 );
             if  (tableName ==  null ) {
                System.out.println("Table name returned null.");
            }
            String columnName = getColumnName(column);
            String query =
                "update "+tableName+
                " set "+columnName+" = "+dbRepresentation(column, value)+
                " where ";	  
             for ( int  col =  0 ; col<getColumnCount(); col++) {
                String colName = getColumnName(col);
                 if  (colName.equals("")) {
                     continue ;
                }
                 if  (col !=  0 ) {
                    query = query + " and ";
                }
                query = query + colName +" = "+
                    dbRepresentation(col, getValueAt(row, col));
            }
            System.out.println(query);
            statement.executeQuery(query);
	    connection.commit();
        }
         catch  (SQLException e) {
              e.printStackTrace();
        }       

        Vector dataRow = (Vector)rows.elementAt(row);
        dataRow.setElementAt(value, column);
    }