code: def _item_to_database(self, iterator, database_pb):
          
          return Database.from_pb(database_pb, self, pool=BurstyPool())
docs: Convert a database protobuf to the native object.
  
          :type iterator: :class:`~google.api_core.page_iterator.Iterator`
          :param iterator: The iterator that is currently in use.
  
          :type database_pb: :class:`~google.spanner.admin.database.v1.Database`
          :param database_pb: A database returned from the API.
  
          :rtype: :class:`~google.cloud.spanner_v1.database.Database`
          :returns: The next database in the page.