#40913 [Com]: PDO::PARAM_LOB does not bind to a stream for fetching a BLOB

 ID:               40913
 Comment by:       mattgrdinic at yahoo dot com
 Reported By:      dennis at inmarket dot lviv dot ua
 Status:           Assigned
 Bug Type:         PDO related
 Operating System: Win XP
 PHP Version:      5.2.1
 Assigned To:      wez
 New Comment:

Can verify this with PDO->mssql using 5.2.6 and Windows Server 2003. 

// Reproduction code:
$VIN = $_GET['VIN'];
	$imageUrl = $_GET['ImageUrl'];
	$sql_img = "SELECT VIN, Image, ImageUrl FROM ImagesDemo WHERE VIN =
:VIN AND ImageUrl =  :imageUrl";
	$result_img = Database::pdo_prepare_query($sql_img, array(':VIN' =>
$VIN, ':imageUrl' => $imageUrl));
	$result_img->bindColumn('Image', $lob, PDO::PARAM_LOB);
	$result_img->fetch(PDO::FETCH_BOUND);
	header("Content-type: image/pjpeg");
        var_dump($lob); // string(4096) + raw image data
	fpassthru($lob); // this call fails with 'supplied argument is not a
valid stream resource'
	echo $lob; // this call only spits out 4096 bytes, chopping the image
off

End result -- unable to use pdo for blobs.


Previous Comments:
------------------------------------------------------------------------

[2008-06-01 13:00:40] mail at matya dot hu

I am using PHP 5.2.6 with MySQL 5.0.51b, and the problem is still
present.

Reproduce code:
---------------

$sql = "SELECT FileData FROM UserFile WHERE ID=?";

$stmt = $DB->prepare($sql);
$stmt->execute(array($FileID));
$stmt->bindColumn(1, $data, PDO::PARAM_LOB);
$stmt->fetch(PDO::FETCH_BOUND);
echo gettype($data);

Expected result:
----------------
resource

Actual result:
--------------
string

------------------------------------------------------------------------

[2008-06-01 12:56:18] mail at matya dot hu

I am using PHP 5.2.6 with MySQL 5.0.51b, and the problem is still
present.

Reproduce code:
---------------

$sql = "SELECT FileName, ContentType, Size, FileData FROM `" .
File::getTableName() . "` WHERE ID=?";
$stmt = $this->_DB->prepare($sql);
$stmt->execute(array($FileID));
$stmt->bindColumn(1, $name, PDO::PARAM_STR, 255);
$stmt->bindColumn(2, $type, PDO::PARAM_STR, 255);
$stmt->bindColumn(3, $size, PDO::PARAM_INT);
$stmt->bindColumn(4, $data, PDO::PARAM_LOB);

Expected result:
----------------

------------------------------------------------------------------------

[2007-06-19 19:06:08] hans at velum dot net

I believe this is probably the same issue, but I also notice that using
MySQL to simply execute a SQL query which contains BLOB result columns
is also returning strings instead of streams.  The difference being that
I'm not using bindColumn() and specifying PDO::PARAM_LOB.  I wouldn't
expect that I'd need to, since simply performing a standard fetch()
works as expected w/ Postgres (and, I believe, Oracle).

------------------------------------------------------------------------

[2007-03-25 12:29:07] dennis at inmarket dot lviv dot ua

Description:
------------
PDOStatement::bindColumn($idx, $var, PDO::PARAM_LOB) for SELECT query
makes $var a string with the BLOB Data rather than a stream, for both
MySQL and SQLite.

Reproduce code:
---------------
$id = (int)$_REQUEST['book'];
$stmt = $conn->prepare("SELECT coverMime, coverImage FROM books WHERE
id=$id");
$stmt->execute();
$stmt->bindColumn(1, $mime);
$stmt->bindColumn(2, $image, PDO::PARAM_LOB);
$stmt->fetch(PDO::FETCH_BOUND);
var_dump($image);

Expected result:
----------------
Resource #1

Actual result:
--------------
String(792) {GIF89a...}


------------------------------------------------------------------------


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