code: def ReadFlowObject(self, client_id, flow_id, cursor=None):
      
      query = ("SELECT " + self.FLOW_DB_FIELDS +
               "FROM flows WHERE client_id=%s AND flow_id=%s")
      cursor.execute(
          query,
          [db_utils.ClientIDToInt(client_id),
           db_utils.FlowIDToInt(flow_id)])
      result = cursor.fetchall()
      if not result:
        raise db.UnknownFlowError(client_id, flow_id)
      row, = result
      return self._FlowObjectFromRow(row)
docs: Reads a flow object from the database.