php从数据库提取二进制图片的处理代码

<?php
$conn=@mysql_connect("localhost","root","123")ordie("服务器连接错误!");//链接数据库
@mysql_select_db("upload",$conn)ordie("未发现数据库!");
$query="select*fromupfilewhereftag=$fn";
$result=mysql_query($query);
if(!$result)die("error:mysqlquery");
$num=mysql_num_rows($result);
if($num<1)die("error:nothisrecorder");
$data=mysql_result($result,0,"picture");
header("Content-type:image/JPEG",true);
echo$data;
?>