update nilai isi dropdown menggunkan CI

mohon bantuannya gan, saya gk bisa update isi dropdown yg nilainya saya ambil dari database,bagaimana cara mengambil nilainya yah?? untuk script update di modelnya saya pake seperti query sql.

UPDATE VIEW

 <div class="form-group">
 <label class="control-label col-md-3 col-sm-3 col-xs-12">Kode Range</label>
    <div class="col-md-2 col-sm-2 col-xs-12" type="number">
        <select class="select2_single form-control" name="$kdrange">
             <option></option>
             <option value="one">1</option>
             <option value="two">2</option>
             <option value="for">4</option>
             <option value="six">6</option>
             <option value="ninetynine">99</option>
        </select>
    </div>
 </div>

MODEL

 function update_data()
    {
        $kdkntr = $this->input->post('kdkntr');
        $kdrange = $this->input->post('kdrange');
        $range_plf1 = $this->input->post('range_plf1');
        $range_plf2 = $this->input->post('range_plf2');
        $tkk1 = $this->input->post('tkk1');
        $tkk5 = $this->input->post('tkk5');
        $tkk2 = $this->input->post('tkk2');
        $tkk6 = $this->input->post('tkk6');

        $this->db->trans_begin();

$sql = "UPDATE PJ_KLP_TT SET KD_KNTR='$kdkntr',KD_RANGE='$kdrange',                                RANGE_PLF1='$range_plf1',RANGE_PLF2='$range_plf2',TKK1='$tkk1', TKK5='$tkk5',TKK2='$tkk2',TKK6='$tkk6' WHERE KD_RANGE = '$kdrange'";

            $update=$this->db->query($sql);

        if ($this->db->trans_status() == FALSE)
            {
                $this->db->trans_rollback();
                return FALSE;
            }
        else
            {
                $this->db->trans_commit();
                return $update;
            }
    }

CONTROLLER

 function update(){
            $kdkntr= $this->session->userdata('SESS_KD_KNTR');
            $user= $this->session->userdata('SESS_FIRST_NAME');

            $this->load->model('pemkepkredit_model');
            $datamenu['judul']='Pemeliharaan Keputusan Kredit';
            $datamenu['menu'] = $this->pemkepkredit_model->display_menu($user);
            $datamenu['data'] = $this->pemkepkredit_model->tampil_semua_data($kdrange);
            /*$datamenu['edit'] = $this->paranotaris_model->update_data();*/
            $this->load->view('pemkepkredit_data_view',$datamenu);
        }
function update_data(){
            $this->load->model('pemkepkredit_model');
            $this->pemkepkredit_model->update_data();
            $this->index();
        }
    }