CodeIgniter- active record insert if new or update on duplicate

Question

Is it possible to do an active record query in CodeIgniter that will update an existing record if one already exists or insert if it doesnt, for the given k

Answer 1

Updated Milaza's answer - Simply done

    $updt_str = '';
    foreach ($array as $k => $v) {
        $updt_str = $updt_str.' '.$k.' = '.$v.',';
    }
    $updt_str = substr_replace($updt_str,";", -1);
    $this->db->query($this->db->insert_string('table_name', $array).' ON DUPLICATE KEY UPDATE '.$updt_str);