model site_model.php :

    // insert data ke database dirubah //
    function tambah_con($data) {
        $this->db->insert('confirm', $data);
    }

    controller home.php :
    // function do_upload diganti ini //
    public function do_upload()
    {
        $config['upload_path'] = "./asset/images/"; //lokasi folder yang akan digunakan untuk menyimpan file
        $config['allowed_types'] = 'gif|jpg|png|JPEG'; //extension yang diperbolehkan untuk diupload
        $config['max_size'] = '1024';
        $config['file_name'] = url_title($this->input->post('file_upload'));

        $this->upload->initialize($config); //meng set config yang sudah di atur
        if( !$this->upload->do_upload('file_upload'))
        {
            echo $this->upload->display_errors();
        }
        else{
            $this->session->set_flashdata('message', '<strong>Congratulation,</strong> you have been registered in this programme, We will change your participant status to be confirmation
                                                  and after that we will send your invitation letter at your <strong>Email.</strong>');
            $data = array(
            'name'=>$this->upload->file_name
            );
            $this->site_model->insert($data,'images');
            //redirect('home/add_con');
            return $this->upload->file_name;
        }
    }

    // function simpan_con diganti ini //
    function simpan_con() {
        $this->form_validation->set_rules('select1', 'Full Name', 'trim|required');
        $this->form_validation->set_rules('account', 'Account Name', 'trim|required');
        $this->form_validation->set_rules('bank', 'Bank Name', 'trim|required');
        $this->form_validation->set_rules('tanggal', 'Date of make a Payment', 'trim|required');
        $this->form_validation->set_rules('file_upload', 'File Upload', 'trim|required');
        if ($this->form_validation->run() == FALSE) {
            if ($this->input->post('submit')) {
                 $this->data['select1'] = $this->input->post('select1');
                 $this->data['id_jen'] = $this->input->post('id_jen');
                 $this->data['st'] = $this->input->post('st');
                 $this->data['account'] = $this->input->post('account');
                 $this->data['bank'] = $this->input->post('bank');
                 $this->data['tanggal'] = $this->input->post('tanggal');
                 $this->data['content'] = 'confirm_p';
                 $this->load->view('template', $this->data);
            }
        } else {
            $this->session->set_flashdata('message', '<strong>Congratulation,</strong> you have been registered in this programme, We will change your participant status to be confirmation
                                          and after that we will send your invitation letter at your <strong>Email.</strong>');
            $st = $this->input->post('st');
            if ($this->input->post('submit')) {
                if (trim($st)=="tambah") {
                    $this->load->model('site_model');
                    $name = $this->input->post('select1');
                    $account = $this->input->post('account');
                    $bank = $this->input->post('bank');
                    $tgl = $this->input->post('tanggal');
                    $upload = $this->do_upload();

                    $data = array('id_jen' => NULL,
                            'name' => $this->input->post('select1');,
                            'acco' => $this->input->post('account'),
                            'bank' => $this->input->post('bank'),
                            'tgl' => $this->input->post('tanggal'),
                            'file' => $upload
                      );
                    $this->site_model->tambah_con($data);
                    redirect('home/add_con');
                }
                else if (trim($st)=="edit") {
                    $this->session->set_flashdata('message', 'Selamat, Anda telah berhasil melakukan Registrasi');
                    $id_jenis = $this->input->post('id_jenis');
                    $this->load->model('site_model');
                    $this->site_model->update($id_jenis);
                    redirect('home/table');
                }
            }
        }
    }