$row=$this->db->fetchAll("select count(*) from reference where id in (select refid from mdref where uuid in (select uuid from normalmetadata where uuid in (select d.uuid from datasource d left join source s on d.sourceid=s.id where s.code='haihe') ))");
$sum=$row[0]['count'];
$sql="select * from reference where id in (select refid from mdref where uuid in (select uuid from normalmetadata where uuid in (select d.uuid from datasource d left join source s on d.sourceid=s.id where s.code='haihe') )) order by reference limit ? offset ?";