下载文件的点击数回填

需要名称为book的mysql数据库表
表中含有下列字段：
id   下载的文件的唯一标识
downnum  点击数

first.php
<?while($myrow = @mysql_fetch_array($result))
{
?>
<TR>
<TD>
<?if(empty($myrow["downnum"])) echo "0"; else echo $myrow["downnum"]; ?>  
</TD>
<TD>
<a  href="ddload.php?purl=downfileurl&dnnum=<?echo $myrow['downnum'] ?>&id=<?echo $myrow['id']?>">click here download </a>
</TD>
</TR>
<?};?>

ddload.php
<?
include("data.inc.php");
if($incerror)
{
echo $incerror;
exit;
}
if(empty($dnnum)) $dnnum = 1;
else $dnnum ++;
$sql = "update book set downnum ='$dnnum' where id =$id";
mysql_query($sql);
mysql_close($connect);
header("location:$purl");
?>
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