由于在codeigniter中通知是succssesfull，因此行记录不会更新

Question

我是Code Igniter的新手，我正在尝试从表单更新kegiatan_mhs数据，但我无法使更新功能正常工作。

这是我的控制器

function update($id)
    {
        // set validation properties
        $this->_set_rules();
        $this->form_data = new stdClass;

        // prefill form values
        $km = $this->km_model->get_by_id($id)->row();
               // $this->form_data->id = $id;
                $this->form_data->km_jmlkeg = $km->km_jmlkeg;



        // set common properties

        $data['title'] = 'Update km';
        $data['message'] = '';
        $data['action'] = site_url('km/updateKm');
        $data['link_back'] = anchor('km/index/','Back to list of km',array('class'=>'back'));

        // load view
        //$this->load->view('personEdit', $data);
                  $data['main_content']='kmEdit';
      $this->load->view('includes_admin/template',$data);
    }

    function updateKm()
    {
        // set common properties
        $data['title'] = 'Update km';
        $data['action'] = site_url('km/updateKm');
        $data['link_back'] = anchor('km/index/','Back to list of km',array('class'=>'back'));

        // set empty default form field values
        $this->_set_fields();
        // set validation properties
        $this->_set_rules();

        // run validation
        if ($this->form_validation->run() == FALSE)
        {
            $data['message'] = '';
        }
        else
        {
            // save data

            $id = $this->input->post('km_id');
            $km = array('km_jmlkeg'=> $this->input->post('km_jmlkeg'),

                            );
            $this->km_model->update($id,$km);

            // set user message
            $data['message'] = '<div class="success">update km success</div>';
        }

        // load view
        //$this->load->view('mapresEdit', $data);
                $data['main_content']='kmEdit';
      $this->load->view('includes_admin/template',$data);
    }

这是我的模特

 function update($id, $kegiatan_mhs){
            $this->db->where('km_id', $id);
            $this->db->update($this->kegiatan_mhs, $kegiatan_mhs);
        }

为什么它不能用于我的DSS