Model are the classes that retrieve the data from your data store (usually the database). You can create your own model as follow:
class News_Model extends Model{
function get_news_list(){
$db = DB::get_instance();
return $db->get_list("SELECT * FROM news");
}
}
function get_news_list(){
$db = DB::get_instance();
return $db->get_list("SELECT * FROM news");
}
}
The model are saved into application/models/ directory, and named as News.php.
Remember that model always return a variable.