docs: def __log_number_of_constants(self):
          """
          Logs the number of constants generated.
          """
          n_id = len(self._labels)
          n_widths = len(self._constants) - n_id
  
          self._io.writeln('')
          self._io.text('Number of constants based on column widths: {0}'.format(n_widths))
          self._io.text('Number of constants based on database IDs : {0}'.format(n_id))