Thursday, September 25, 2008

[PHP] Can't get PHP PDO LOB working with PostgreSQL (WRONG CODE)

I am very sorry I submitted the wrong code in the original
email. The email below is the right one! Please disregard my first
email to this list.


I have spent about two working days trying to get PostgreSQL working
with PDO inserting binary content and pulling it back out without

I have tested this on Debian Etch using PHP 5.2.0 and PostgreSQL(libpq)
8.1.11. I have enabled the PostgreSQL PDO driver.

I have set up a simple table to hold the content:

id serial
blob_type character varying
attachment oid

I am using a simple form to process the upload, and my PHP upload
script looks like this (modified a little from the PHP manual):

try {

$pdo = new PDO ("$pdo_database:host=$pdo_hostname;dbname=

} catch (Exception $e) {

echo 'Caught exception: ',$e->getMessage(), "\n";


require_once ("knl_mime_type.php"); // Gets the correct mime type.
$mime_type = new knl_mime_type();
$blob_type = $mime_type->getMimeType($tmpfilename);

$oid = $pdo->pgsqlLOBCreate();
$stream = $pdo->pgsqlLOBOpen($oid, 'w');
$local = fopen($tmpfilename, 'rb');
stream_copy_to_stream($local, $stream);
$local = null;
$stream = null;

$attachment = fopen($_FILES['file']['tmp_name'], "rb");
$filename = $_FILES['file']['name'];

$stmt = $pdo->prepare("INSERT INTO attachments (blob_type, filename,
attachment) VALUES (:blob_type, :filename, :attachment)");

$stmt->bindParam(':blob_type', $blob_type, PDO::PARAM_STR);
$stmt->bindParam(':filename', $filename, PDO::PARAM_STR);
$stmt->bindParam(':attachment', $attachment, PDO::PARAM_LOB);



When I submit the form, I can see (using PHPPgAdmin) the binary file, in
this test case a PNG image being inserted.

From the table I see this info using PHPPgAdmin:

id blob_type filename attachment
25 image/png shot2.png 16441

I don't know how the binary data are supposed to look like since I am
migrating from MySQL, and only have that as a comparison.

If I understand the PostgreSQL manual correctly the above number
"16441" is a OID reference number to the binary data.

I don't know if the above is correct or if PostgreSQL has received the
binary data correctly, maybe someone can confirm this for me please?

Anyway, when I try to pull that data from the database (again using the
example from the PHP manual) I just get the reference number "16441"
back to the browser.

I am using the following code to retrieve the data:

$stmt = $pdo->prepare("SELECT blob_type, attachment FROM attachments
WHERE id = :id LIMIT 1");
$stmt->bindParam(':id', $_GET['id'], PDO::PARAM_STR);


$results = $stmt->fetchAll();

foreach ($results as $row) {
$blob_type = $row['blob_type'];
$attachment = $row['attachment'];

header("Content-type: $blob_type");
echo $attachment;

If I use Firefox and take a look at the source code behind the page I
get served, I just see the number "16441" and nothing else.

Please notice that the above example are taken directly from the PHP
manual just modified a little. I have also tried using the examples
directly without any modifications, but the result is the same.

What am I missing or doing wrong here?

Best regards.


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