How to truncate a table using Doctrine 2?

Question

I assume that I need to build a native query to truncate a table using Doctine2.

$emptyRsm = new \\Doctrine\\ORM\\Query\\ResultSetMapping();
$sql = \'TRUNCAT         


        

Answer 1

This is example truncating method from trait in unit tests.

/**
 * Cleanup any needed table abroad TRUNCATE SQL function
 *
 * @param string $className (example: App\Entity\User)
 * @param EntityManager $em
 * @return bool
 */
private function truncateTable (string $className, EntityManager $em): bool {
    $cmd = $em->getClassMetadata($className);
    $connection = $em->getConnection();
    $connection->beginTransaction();

    try {
        $connection->query('SET FOREIGN_KEY_CHECKS=0');
        $connection->query('TRUNCATE TABLE '.$cmd->getTableName());
        $connection->query('SET FOREIGN_KEY_CHECKS=1');
        $connection->commit();
        $em->flush();
    } catch (\Exception $e) {
        try {
            fwrite(STDERR, print_r('Can\'t truncate table ' . $cmd->getTableName() . '. Reason: ' . $e->getMessage(), TRUE));
            $connection->rollback();
            return false;
        } catch (ConnectionException $connectionException) {
            fwrite(STDERR, print_r('Can\'t rollback truncating table ' . $cmd->getTableName() . '. Reason: ' . $connectionException->getMessage(), TRUE));
            return false;
        }
    }
    return true;
}

Please note, that if you do not use $em->flush(), you have a risk to have a problem with next query to doctrine.

Also you must understand, that if you use this method in a controller, you must change the lines fwrite(STDERR, print_r(... to something your logger service can use.