[vrushalini]

<?php
define('FPDF_FONTPATH','font/');
require('fpdi.php');

$pdf= new fpdi();
$pagecount = $pdf->setSourceFile("pdfdoc.pdf");

$tplidx = $pdf->ImportPage(1);

$pdf->addPage();
$pdf->useTemplate($tplidx,10,10,90);

$pdf->Output("newpdf.pdf","F");
?>

[spullen]

Are you asking how to store the actual file in the database. If it is this I would not recommend it. A better way to store this information is store the file on disk somewhere, and store the file path to the location of the pdf in the database.
However if you are so inclined to store the file in the database, look up blobs and mysql on google, or "how to store files in the database", I'm sure this will be what you want.