Jak dostat PDF z databáze?

<?php
$pripojeni = new mysqli("localhost", "user", "pwd", "db");
if ($pripojeni->connect_errno > 0) die("Chyba při připojení.");
$pripojeni->query("SET NAMES utf8");
$vysledek = $pripojeni->query("SELECT * FROM `tabulka` WHERE Id=\"1\"");
while($zaznam = $vysledek->fetch_object()) printf("%s", $zaznam->Pdf);
$pripojeni->close();
?>

<a href="
<?php>
$pripojeni = new mysqli("localhost", "user", "pwd", "db");
if ($pripojeni->connect_errno > 0) die("Chyba při připojení.");
$pripojeni->query("SET NAMES utf8");
$vysledek = $pripojeni->query("SELECT * FROM `maturitni_prace` WHERE Id=\"1\"");

/*$file = $vysledek->Pdf .".pdf";
header("Content-Disposition: attachment; filename=" . urlencode($file));   
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");            
header("Content-Length: " . filesize($file));
flush(); // this doesn't really matter.
$fp = fopen($file, "r");
while (!feof($fp))
{
    echo fread($fp, 65536);
    flush(); // this is essential for large downloads
} 
fclose($fp); */

$file = $vysledek->Pdf;
if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header("Content-Type: application/force-download");
    header('Content-Disposition: attachment; filename=' . urlencode(basename($file)));
    // header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
?>" target="_blank" type="application/octet-stream" download="yourpdf.pdf">
<img src="soubory/pdf.gif" height="150" width="150"></a>