* update database flag*

        **Key Arguments:**
            - ``exposures`` -- the atlas exposure to update the database flags for

def _update_database_flag(
            self,
            exposures):
        """* update database flag*

        **Key Arguments:**
            - ``exposures`` -- the atlas exposure to update the database flags for
        """
        self.log.info('starting the ``_update_database_flag`` method')

        allExposures = []
        for e in exposures:
            allExposures += e

        expIds = []
        expIds[:] = [e["expname"] for e in allExposures]

        expIds = ('","').join(expIds)

        sqlQuery = """update atlas_exposures a, pyephem_positions p set a.pyephem_positions = 1 where a.pyephem_positions = 0 and a.expname=p.expname;""" % locals(
        )
        writequery(
            log=self.log,
            sqlQuery=sqlQuery,
            dbConn=self.atlasMoversDBConn,
        )

        sqlQuery = """update atlas_exposures set pyephem_positions = 2, dophot_match = 2, orbfit_positions = 2 where pyephem_positions = 0 and expname in ("%(expIds)s");""" % locals(
        )
        writequery(
            log=self.log,
            sqlQuery=sqlQuery,
            dbConn=self.atlasMoversDBConn,
        )

        self.log.info('completed the ``_update_database_flag`` method')
        return None