Update ข้อมูลไม่ได้ค่ะ ทำอย่างไรดี !! มีการใช้ if else ด้วย

$sql7 = "select * from donat WHERE Status=2 AND DonorID = '".$DonorID."' ";
  			$sql = mysql_query($sql7);
			$row1 = mysql_fetch_array($sql) or die ("Error Query 55+");
			
			if($row1[Quan_PRC]==0){		
				$sql1 = "UPDATE donat SET Quan_PRC = '$Quan_PRC' where DonorID = $DonorID And Status=2";
				$objQuery = mysql_query($sql1) or die ("Error Query :".$sql1."");
				}
			else if($row1[Quan_LPRC]!=0){
				$sql2 = "UPDATE donat SET Quan_LPRC ='$Quan_LPRC' where DonorID =$DonorID And Status=2";
				$objQuery = mysql_query($sql2) or die ("Error Query :".$sql2."");
				}
			else if($row1[Quan_PRC]!=0 and $row1[Quan_LPRC]!=0 and $row1[Quan_LDPRC]==0){
				$sql3 = "UPDATE donat SET Quan_LDPRC = '$Quan_LDPRC' where DonorID =$DonorID And Status=2";
				$objQuery = mysql_query($sql3) or die ("Error Query :".$sql3."");
			}	
		echo"เปลี่ยนแปลงข้อมูลเรียบร้อยแล้ว<br>";