I can't reproduce using 5.3CVS:

$db = new PDO('pgsql:host=localhost dbname=test', 'foo', 'bar', array(PDO::ATTR_STRINGIFY_FETCHES => TRUE));

$stmt = $db->prepare("INSERT INTO test_one_blob (blob1) VALUES (?)");
$stmt->execute(array(''));
var_dump($db->errorinfo());

$stmt = $db->prepare("INSERT INTO test_one_blob (blob1) VALUES (:foo)");
$x = '';
$stmt->bindParam(':foo', $x);
$stmt->execute();
var_dump($db->errorinfo());

$stmt = $db->query("INSERT INTO test_one_blob (blob1) VALUES ('')");
$stmt->execute();


teste=> select * from test_one_blob where blob1 is null;
 id | blob1 
----+-------
(0 registros)


Do you have tested using PDO directly, without Drupal's db_insert()?

According to http://www.php.net/manual/en/pdo.lobs.php, using PDO for BLOB INSERT/UPDATE should come with:
1. bindParam/bindColumn
2. PDO::PARAM_LOB
3. stream API, e.g. fopen(), fwrite(), rewind(), etc.

You may try to insert other value though you code snippet. The value should also NOT able to insert into PostgreSQL...

The bug reproduction code in http://drupal.org/node/316095#comment-1047830 is using pdo_pgsql directly. The db_insert() used is just a fake clone of Drupal CVS HEAD function with simplified programming logic.

Oh sorry, you're right. I can reproduce it.

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

I try for both PHP5.2 and 5.3 from http://snaps.php.net/ (they both coming with the fix). They are now able to handle NULL and empty string BLOB INSERT/UPDATE. Thanks for the work.

BTW, it is now generate another issue that should belongs to http://bugs.php.net/bug.php?id=46274. Whenever fetching NULL or empty BLOB content from DB apache will crash with Segmentation fault. Maybe we still need some love for that :S

Do you have tried after 13:03:31 2008 UTC? I've commited a complete fix to these issue in this time.

Thanks.

@felipe: Yes I did. I give a compare with cvs.php.net log message, and check if my PHP package coming with the fix. Fix is already included, #46249 is fixed but than buggy for #46274 as mentioned :S

I try both PHP in CLI and Apache2.2. BLOB INSERT/UPDATE are successful in both cases, but fetching NULL and empty string are both buggy...

Bug still exists, but preform in another way... Please try the following code snippet:

<?php

function _var_dump($msg) {
  print("<code><pre>");
  var_dump($msg);
  print("</pre></code>");
}

function db_insert($sql, $data) {
  global $active_db;
  $stmt = $active_db->prepare($sql);
  $blob = fopen('php://memory', 'a');
  fwrite($blob, $data);
  rewind($blob);
  $stmt->bindParam(':blob1', $blob, PDO::PARAM_LOB);
  $stmt->execute();
  $id = $active_db->lastInsertId('test_one_blob_id_seq');
  return $id;
}

function db_select($sql, $id) {
  global $active_db;
  $sql = 'SELECT * FROM "test_one_blob" WHERE "id" = :id';
  $stmt = $active_db->prepare($sql);
  $stmt->bindParam(':id', $id);
  $stmt->execute();
  return $stmt->fetch(PDO::FETCH_ASSOC);
}

$active_db = new PDO('pgsql:host=localhost dbname=DRUPAL_7', 'root', 'CHANGE', array(PDO::ATTR_STRINGIFY_FETCHES => TRUE));

// Test normal BLOB insert
$data = "This is\000a test.";
$id = db_insert('INSERT INTO "test_one_blob" ("blob1") VALUES (:blob1)', $data);
$return = db_select('SELECT * FROM "test_one_blob" WHERE "id" = :id', $id);
_var_dump("Test normal BLOB insert");
_var_dump($data);
_var_dump($return['blob1']);
_var_dump($data === $return['blob1']);

// Test NULL BLOB insert
$data = NULL;
$id = db_insert('INSERT INTO "test_one_blob" ("blob1") VALUES (:blob1)', $data);
$return = db_select('SELECT * FROM "test_one_blob" WHERE "id" = :id', $id);
_var_dump("Test NULL BLOB insert");
_var_dump($data);
_var_dump($return['blob1']);
_var_dump($data === $return['blob1']);

// Test empty BLOB insert
$data = "";
$id = db_insert('INSERT INTO "test_one_blob" ("blob1") VALUES (:blob1)', $data);
$return = db_select('SELECT * FROM "test_one_blob" WHERE "id" = :id', $id);
_var_dump("Test empty BLOB insert");
_var_dump($data);
_var_dump($return['blob1']);
_var_dump($data === $return['blob1']);

?>

It is now result as:

string(23) "Test normal BLOB insert"

string(15) "This is�a test."

string(15) "This is�a test."

bool(true)

string(21) "Test NULL BLOB insert"

NULL

string(0) ""

bool(false)

string(22) "Test empty BLOB insert"

string(0) ""

string(0) ""

bool(true)

You aren't working with real NULL, but with a "empty resource". It's exaclty what happens to fwrite($fp, '') too.

Only using the code below you will get the NULL as expect:
$blob = null;
$stmt->bindParam(':blob1', $blob, PDO::PARAM_LOB);


Thanks.

Thanks felipe!! After update the code snippet of db_insert() as below, everything works fine:

<?php

function db_insert($sql, $data) {
  global $active_db;
  $stmt = $active_db->prepare($sql);
  if (is_null($data)) {
    $stmt->bindParam(':blob1', $data, PDO::PARAM_LOB);
  }
  else {
    $blob = fopen('php://memory', 'a');
    fwrite($blob, $data);
    rewind($blob);
    $stmt->bindParam(':blob1', $blob, PDO::PARAM_LOB);
  }
  $stmt->execute();
  $id = $active_db->lastInsertId('test_one_blob_id_seq');
  return $id;
}

?>