def _get_recids_invenio12(from_date):
    """Get BibDocs for Invenio 1."""
    from invenio.dbquery import run_sql
    return (id[0] for id in run_sql(
        'select id_bibrec from '
        'bibrec_bibdoc as r join bibdoc as d on r.id_bibdoc=d.id '
        'where d.modification_date >=%s',
        (from_date, ), run_on_slave=True))
Get BibDocs for Invenio 1.