Do unbuffered queries for one request with PDO

Question

i'm looking to do unbuffered queries only on some requests.

In mysql I was doing this :

$req = mysql_unbuffered_query('SELECT * FROM forum_topics
ORDER BY (topic_id/topic_stick) DESC, topic_last_post DESC');
while($data = mysql_fetch_assoc($req)) {
   // display results...
}

I looked at php doc, and according to it in pdo we must proceed this way to do queries unbuffered :

$pdo = new PDO("mysql:host=localhost;dbname=world", 'my_user', 'my_pass');
$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);

$uresult = $pdo->query("SELECT Name FROM City");

if ($uresult) {
   while ($row = $uresult->fetch(PDO::FETCH_ASSOC)) {
       echo $row['Name'] . PHP_EOL;
   }
}

But is it possible to do it unbuffered only for the "forum_topics" table results without setting all pdo instance to unbuffered?

Answer 1

Re, this doesn't work, I obtain an error while using your method:

SQLSTATE[IM001]: Driver does not support this function: This driver doesn't support setting attributes

What's wrong?

Edit : I found the solution on php.net doc.

If you use this:

$sth->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);

It doesn't work.

But if you set it in an array in prepare(), it works fine.

$sth = $pdo->prepare('SELECT * FROM my_table',
array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => false));

I hope this will help people who haven't found a way for this problem.