code: def _fetchall(self, query, vars, limit=None, offset=0):
          
          if limit is None:
              limit = current_app.config['DEFAULT_PAGE_SIZE']
          query += ' LIMIT %s OFFSET %s''' % (limit, offset)
          cursor = self.get_db().cursor()
          self._log(cursor, query, vars)
          cursor.execute(query, vars)
          return cursor.fetchall()
docs: Return multiple rows.