code: def searchRnaQuantificationsInDb(
              self, rnaQuantificationId=""):
          
          sql = ("SELECT * FROM RnaQuantification")
          sql_args = ()
          if len(rnaQuantificationId) > 0:
              sql += " WHERE id = ? "
              sql_args += (rnaQuantificationId,)
          query = self._dbconn.execute(sql, sql_args)
          try:
              return sqlite_backend.iterativeFetch(query)
          except AttributeError:
              raise exceptions.RnaQuantificationNotFoundException(
                  rnaQuantificationId)
docs: :param rnaQuantificationId: string restrict search by id
          :return an array of dictionaries, representing the returned data.