php - Try Manual Connection

I have a form with fields to make a connection to the database using CodeIgniter. The data is filled in by the users in the form. Is it possible to know if the connection is established or not?

$drive      = $this->input->post('drive');
$hostname   = $this->input->post('hostname');
$database   = $this->input->post('database');
$username   = $this->input->post('username');
$password   = $this->input->post('password');
$base       = $this->input->post('base');

$db = array(
                'hostname' => $hostname,
                'username' => $username,
                'password' => $password,
                'database' => $database,
                'dbdriver' => $drive,
                'db_debug' => FALSE);

       $cn =  $this->load->database($db);

if ($cn) { echo 'ok'; } else {echo 'nops';} 
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