Do unbuffered queries for one request

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

You can set the attribute on the PDO connection:

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

then run this particular query which result needs to be unbuffered,

$uresult = $pdo->query("SELECT Name FROM City");
while ($row = $uresult->fetch(PDO::FETCH_ASSOC)) {
    echo $row['Name'] . PHP_EOL;
}

and then set the attribute back

$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);