Laravel - Getting Started - Using Multiple Database Connections

If your application defines multiple connections in your config/database.php configuration file, you may access each connection via the connection method provided by the DB facade. The connection name passed to the connection method should correspond to one of the connections listed in your config/database.php configuration file or configured at runtime using the config helper:

    use Illuminate\Support\Facades\DB;
    $users = DB::connection('sqlite')->select(...);

You may access the raw, underlying PDO instance of a connection using the getPdo method on a connection instance:

    $pdo = DB::connection()->getPdo();