$sql='select a.id,a.docnum,a.status,b.nowcheckname from oa_c_fininfom_oafk as a INNER JOIN oa_flow_bill as b on a.docnum=b.sericnum where a.docnum in '."(".$str.")";
$data=$this->db->getall('select a.id,a.docnum,a.status,b.nowcheckname from oa_c_fininfom_oafk as a INNER JOIN oa_flow_bill as b on a.docnum=b.sericnum ');