def METHOD_NAME(dskey, calc_id, datadir, target_dir, export_types):
    """
    Simple UI wrapper around
    :func:`openquake.engine.export.core.export_from_db` yielding
    a summary of files exported, if any.
    """
    outkey = get_outkey(dskey, export_types.split(','))
    if export_types and not outkey:
        yield 'There is no exporter for %s, %s' % (dskey, export_types)
        return
    yield from export_from_db(outkey, calc_id, datadir, target_dir)