如何删除更新查询的错误？

I write doctrine update query in symfony but it always takes last data and put it in all the fields, here is my code:

if($request->isXmlHttpRequest()) {
            $response = new Response();

            for($i=0; $i<$sectioncounter; $i++){
             $sectionname = $_POST['sectionName'.$i];
             $description=$_POST['description'.$i];
              $query = $em->createQuery("Update ProposalsProposalsBundle:Sections s  set s.sectionName='".$sectionname."',s.description='".$description."',s.updatedDatetime='".$date."' where s.proposalID='".$proposalid."'");    
             $ids = $query->getResult();
            }
        return $response;
        }

My sectioncounter=2 but when I check in database $description1,$sectionname1 values overwrite $sectionname0 and description0, how to remove this error? I want update query to run sectioncounter times, how do I do this?

Where do you change the value of $proposalid? If you dont change this you are executing this query many times afecting the same row