fetch_scroll (DBI::DBD::SQLRelay::Statement)

    # File SQLRelay.rb, line 266
      def fetch_scroll(direction, offset=1)

        # decide which row to fetch, take into account that the standard behavior
        # of a fetch command is to fetch the row and then skip to the next row
        # of the result set afterward
        fetch_row = case direction
          when DBI::SQL_FETCH_NEXT     then @row_index
          when DBI::SQL_FETCH_PRIOR    then @row_index-2
          when DBI::SQL_FETCH_FIRST    then 0
          when DBI::SQL_FETCH_LAST     then @row_count-1
          when DBI::SQL_FETCH_ABSOLUTE then offset
          when DBI::SQL_FETCH_RELATIVE then @row_index+offset-1
        end

        # fetch the row
        row = nil
        if fetch_row > -1 and fetch_row < @row_count
          row = @handle.getRow(fetch_row)
        end

        # set the current row, avoid running past
        # the end or beginning of the result set
        @row_index = fetch_row + 1
        if @row_index < 0 then
          @row_index = 0
        elsif @row_index > @row_count
          @row_index = @row_count
        end

        return row
      end