Re: Can't get PHP PDO LOB working with PostgreSQL (WRONG CODE) - Mailing list pgsql-php

On Thu, 25 Sep 2008 21:32:17 +0200
Rico Secada <coolzone@it.dk> wrote:

I don't know how I got the code input for this email mixed up, but off
course I am not inserting the $attachment into the database but in fact
the $oid variable.

I have changed the code to this, and this is when I am faced with
problems:

$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->beginTransaction();
$oid = $pdo->pgsqlLOBCreate();
$stream = $pdo->pgsqlLOBOpen($oid, 'w');
$local = fopen($tmpfilename, 'rb');
stream_copy_to_stream($local, $stream);
$local = null;
$stream = null;
$stmt = $pdo->prepare("INSERT INTO attachments (blob_type, filename,
attachment, filesize) VALUES (?, ?, ?, ?)");

$stmt->execute(array ($blob_type, $filename, $oid, $filesize));

$pdo->commit();


> 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.
>
> Hi.
>
> I have spent about two working days trying to get PostgreSQL working
> with PDO inserting binary content and pulling it back out without
> success.
>
> 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=
> $pdo_dbname","$pdo_username","$pdo_password");
> $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
>
> } 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);
>
> $pdo->beginTransaction();
> $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);
>
> $stmt->execute();
>
> $pdo->commit();
>
> 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);
>
> $stmt->execute();
>
> $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.
>
> http://dk.php.net/manual/en/function.pdo-pgsqllobcreate.php
>
> What am I missing or doing wrong here?
>
> Best regards.
>
> Rico.
>
>
>
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