Recalling a field to print another one

Look at this models:

PHP Code:

public function dataList($name) {
        $db = $this->load->database('default', TRUE);
        $db    ->select('value')
            ->where('name', $name)
                        ->from('setting');
        $query_setting = $db->get('');
        return $query_setting->row_array();
    } 


I would make sure to enter the variable name within the template and let me return the value.

For example:
In the template I write:

Code:

{$name_site}

The template return the value of string table that have for name "name_site"

My question is. How can I build the controller?

For I use smarty template engine.