How to get file name to be inserted to database ?

[eluser]Derek Allard[/eluser]
ok, good - now let's keep working.

Code:

$this->load->model('Model_name');

$file_name = "Derek";
$file_type = "jpg";
$username  = "derek.allard";

$this->Model_name->save_image($file_name); // what does this line look like to get 3 vars inserted?