upload file in mysql

[camionistaxcaso]

Ciao a tutti, ho un problema con l' inserimento di un file nel DB.

$fileName = $_FILES['userfile']['name'];
$tmpName  = $_FILES['userfile']['tmp_name'];
$fileSize = $_FILES['userfile']['size'];
$fileType = $_FILES['userfile']['type'];
$fp = fopen($tmpName, 'r');
$content = fread($fp, filesize($tmpName));
$content = addslashes($content);fclose($fp);
if(!get_magic_quotes_gpc())
{    
   $fileName = addslashes($fileName);
}

$sql = "UPDATE t_summary_of_work 
           SET subject = '".$_POST["sow_subject"]."',                 
                 with_iva = ".$_POST["with_iva"].",                 
                 cost_sow = ".$_POST["num_sow"].",                     
                 note = '".$_POST["note_sow"]."',
                 id_summary_of_work_status = ".$_POST["sow_status"].",                
                 data_file = ".$content."                 
WHERE id_summary_of_work = ".$_POST["id_sow"];       

if($link->query($sql))
{
header("Location: home_sow.php?sez=sow_update&id=".$_POST["id_sow"]."&msg=notice&code=3");        
}
else{print "Errore durante l' inserimento dei dati.";} 

Mi da errore nella query...grazie