I think you are looking for:
$this->db->count_all('songs_tbl');
or if you want the distinct in there you will need to do something like this:
$this->db->select('song_id');
$this->db->distinct();
$this->db->from('songs_tbl');
$query = $this->db->get();
return $query->num_rows();
As there is/was? an issue with using count_all_results()
function and DISTINCT
EDIT
I have never used smarty but based on the code in the question I imagine something like this might work, please correct me if I am wrong:
private function getHeaderInfo()
{
$total_songs = get_all_songs();// This function should be called through a model
$this->mysmarty->assign('total_songs',$total_songs);
}
function get_all_songs(){ //THIS SHOULD BE IN A MODEL
$this->db->select('song_id');
$this->db->distinct();
$this->db->from('songs_tbl');
$query = $this->db->get();
return $query->num_rows();
}
Edit 2
My suggested layout would be something along these lines (UNTESTED) using CodeIgniter WITHOUT smarty:
Model Song.php
class Song extends CI_Model {
//Constructor and other functions
function count_all_songs(){
$this->db->select('song_id');
$this->db->distinct();
$this->db->from('songs_tbl');
$query = $this->db->get();
return $query->num_rows();
}
}
Controller Songs.php
class Song extends CI_Controller {
//Constructor and other functions
function index(){ //This could be any page
$this->load->model('Song'); //Could be in constructor
$total_songs = $this->Song->count_all_songs();
$this->load->view('songs_index.html', array('total_songs' => $total_songs));
}
}
View songs_index.html
<html><head></head><body>
Total Songs: <?php echo $total_songs ?>
</body></html>