code: def MultiReadClientLabels(self, client_ids, cursor=None):
      
  
      int_ids = [db_utils.ClientIDToInt(cid) for cid in client_ids]
      query = ("SELECT client_id, owner_username, label "
               "FROM client_labels "
               "WHERE client_id IN ({})").format(", ".join(["%s"] *
                                                           len(client_ids)))
  
      ret = {client_id: [] for client_id in client_ids}
      cursor.execute(query, int_ids)
      for client_id, owner, label in cursor.fetchall():
        ret[db_utils.IntToClientID(client_id)].append(
            rdf_objects.ClientLabel(name=label, owner=owner))
  
      for r in itervalues(ret):
        r.sort(key=lambda label: (label.owner, label.name))
      return ret
docs: Reads the user labels for a list of clients.