file_name

---------------controller--------------
function tambahbiodata() {
        if($this->session->userdata('sudah_login_pelamar')){
                        $user=$this->session->userdata('username');
            $config['upload_path'] = './biodata_pelamar/';
            $config['allowed_types'] = 'jpg|pdf';

            $this->load->library('upload', $config);

                if ( ! $this->upload->do_upload()){
                    $array = array( 'content' => $this->load->view('akun_pelamar/gagal','',true) );
               $this->load->view('akun_pelamar/menu', $array);
                }else{
                    $this->load->model('pelamar_model');
                                        $this->pelamar_model->update($user);
                    $reg['query'] = $this->pelamar_model->tambahbiodata();
                        if($reg['query']) {
                            $array = array( 'content' => $this->load->view('akun_pelamar/sukses','',true) );
                            $this->load->view('akun_pelamar/menu', $array);
                        }
                }
        }else {
            redirect('index/index');
            }
        }

----------------Model----------------------
function tambahbiodata() {
        $no=$this->input->post('no_urut');

        $img = $this->upload->data();
        $file_name = "GE".$no."_".$img['file_name'];

        $data = array(
                    'no_urut'=>$no,
                    'noktp'=>$this->input->post('noktp'),
                    'nama_lengkap'=>$this->input->post('nama'),
                    'tempat_lahir'=>$this->input->post('tempat_lahir'),
                    'tgl_lahir'=>$this->input->post('tgl_lahir'),
                    'jk'=>$this->input->post('jk'),
                    'alamat'=>$this->input->post('alamat'),
                    'kota'=>$this->input->post('kota'),
                    'country'=>$this->input->post('country'),
                    'kodepos'=>$this->input->post('kodepos'),
                    'agama'=>$this->input->post('agama'),
                    'goldar'=>$this->input->post('goldar'),
                    'telp'=>$this->input->post('telp'),
                    'status'=>$this->input->post('status'),
                    'email'=>$this->input->post('email'),
                    'file'=>'biodata_pelamar/'.$file_name
                    );
        $query = $this->db->insert('biodata_pelamar',$data);
        return $query;
    }