$container->register('mysql.example', 'Symfony\Component\DependencyInjection\Tests\Compiler\ServiceClassMysql');
$container->register('mariadb.example', 'Symfony\Component\DependencyInjection\Tests\Compiler\ServiceClassMariadb');
$container->register('mysql.example', 'Symfony\Component\DependencyInjection\Tests\Compiler\ServiceClassMysql');
$container->register('mariadb.example', 'Symfony\Component\DependencyInjection\Tests\Compiler\ServiceClassMariadb');