# File lib/rubyrep/proxy_row_cursor.rb, line 36
    def next_row_keys_and_checksum
      self.current_row = cursor.next_row
      keys = self.current_row.reject {|key, | not primary_key_names.include? key}
      checksum = Digest::SHA1.hexdigest(Marshal.dump(self.current_row))
      return keys, checksum
    end