MySQL transaction, rollback doesn't work, (PHP PDO) - php

Question

I have a loop that inserts data in two tables, in the first iteration of the loop the insert is succesfull, but in the second iteration the insert will fail.
I have written the script so that if any of the iterations fail, the entire transaction should be rollbacked. However, this doesn't work.
The first iteration (that succeeded) isn't rolled back...
<?php
include('model/dbcon.model.php');
$languages = array('project_nl', 'project_en');
DBCon::getCon()->beginTransaction();
$rollback = true;
foreach($languages as $language) {
$Q = DBCon::getCon()->prepare('INSERT INTO `'.$language.'`(`id`, `name`, `description`, `big_image`) VALUES (:id,:name,:description,:big_image)');
$Q->bindValue(':id', '1', PDO::PARAM_INT);
$Q->bindValue(':name', 'test', PDO::PARAM_INT);
$Q->bindValue(':description', 'test', PDO::PARAM_INT);
$Q->bindValue(':big_image', 'test', PDO::PARAM_INT);
try {
$Q->execute();
} catch (PDOException $e) {
$rollback = true;
}
}
if ($rollback) {
echo 'rollbacking...';
DBCon::getCon()->rollBack();
} else {
echo 'commiting...';
DBCon::getCon()->commit();
}
?>
Why isn't the entire transaction rolled back?
Thanks in advance.

Answer 1

Either auto-commit is enabled, or the connection is not persisting, or you're not using innodb.
This will work, which means DBCon::getCon() is not doing what you think it's doing.
<?php
include('model/dbcon.model.php');
$languages = array('project_nl', 'project_en');
$connection = DBCon::getCon();
$connection->beginTransaction();
$rollback = true;
foreach($languages as $language) {
$Q = $connection->prepare('INSERT INTO `'.$language.'`(`id`, `name`, `description`, `big_image`) VALUES (:id,:name,:description,:big_image)');
$Q->bindValue(':id', '1', PDO::PARAM_INT);
$Q->bindValue(':name', 'test', PDO::PARAM_INT);
$Q->bindValue(':description', 'test', PDO::PARAM_INT);
$Q->bindValue(':big_image', 'test', PDO::PARAM_INT);
try {
$Q->execute();
} catch (PDOException $e) {
$rollback = true;
}
}
if ($rollback) {
echo 'rollbacking...';
$connection->rollBack();
} else {
echo 'commiting...';
$connection->commit();
}
?>