PHP PDO Mysql Insert Performance

Question

I normally don\'t use a lot of SQL stuff in PHP but recently have been forced into it by a friend as to help him debug something.

I am using PDO with PHP to insert some

Answer 1

As Simon stated in a comment, there is no use of doing the preparation within the loop. Doing so will cause 300 queries to be sent to the database, each time one for the preparation and on for the actual insert. Using the prepare-statement before will cause only 151 queries:

$query = $data->prepare("INSERT INTO `tbl_temp` (aid, bid) VALUES (?, ?)");
for ($i = 1; $i <= 150; $i++) {
    $time = time();
    $query->execute(array($i, $time));
}

Another idea could be to use instead a combined multi insert statement. I guess it could have a better performance, but I'm not quite sure:

$query = 'INSERT INTO `tbl_temp` (aid, bid) VALUES';
for ($i = 1; $i <= 150; $i++) {
    if ($i == 1) {
        $query .= ' ('.$i.', '.time().')';
    } else {
        $query .= ', ('.$i.', '.time().')';
    }
}
$data->exec($query);