php从数据库提取二进制图片

        $conn=@mysql_connect("localhost","root","123") or die("服务器连接错误!"); //链接数据库
        @mysql_select_db("upload",$conn) or die("未发现数据库!");
    $query="select * from upfile where ftag=$fn";
    $result=mysql_query($query);
    if(!$result) die("error: mysql query");
    $num=mysql_num_rows($result);
    if($num     $data = mysql_result($result,0,"picture");
    header("Content-type: image/JPEG",true);
    echo $data;    
?>