Pengembangan AKD-KTSP KE Framework CI Foto tidak bisa ke simpan

Saya sedang upload foto tetapi tidak nyimpan ke db, 
 
 
    function guru_tambah(){
        $config['upload_path'] = 'asset/foto_user/';
        $config['allowed_types'] = 'gif|jpg|png|JPG|JPEG';
        $config['max_size'] = '18000'; // kb
        $this->load->library('upload', $config);
        $this->upload->do_upload('file');
        $hasil=$this->upload->data();
            if ($hasil['file_name']==''){
                    $datadb = array('nip'=>$this->db->escape_str($this->input->post('nip')),
                                    'nik'=>$this->db->escape_str($this->input->post('nik')),
                                    'id_jenis_kelamin'=>$this->db->escape_str($this->input->post('jenis_kelamin')),
                                    'nama_guru'=>$this->db->escape_str($this->input->post('nama_guru')),
                                    'tempat_lahir'=>$this->db->escape_str($this->input->post('tempat_lahir')),
                                    'tanggal_lahir'=>date('Ymd', strtotime(date($this->input->post('tanggal_lahir')))),    
                                    'id_agama'=>$this->db->escape_str($this->input->post('agama')),
                                    'alamat_jalan'=>$this->db->escape_str($this->input->post('alamat_jalan')),
                                    'rt'=>$this->db->escape_str($this->input->post('rt')),
                                    'rw'=>$this->db->escape_str($this->input->post('rw')),
                                    'nama_dusun'=>$this->db->escape_str($this->input->post('nama_dusun')),
                                    'desa_kelurahan'=>$this->db->escape_str($this->input->post('kelurahan')),
                                    'kecamatan'=>$this->db->escape_str($this->input->post('kecamatan')),
                                    'kode_pos'=>$this->db->escape_str($this->input->post('kode_pos')),
                                    'telepon'=>$this->db->escape_str($this->input->post('telepon')),
                                    'hp'=>$this->db->escape_str($this->input->post('hp')),
                                    'email'=>$this->db->escape_str($this->input->post('email')),
                                    'kewarganegaraan'=>$this->db->escape_str($this->input->post('kewarganegaraan')),
                                    'nuptk'=>$this->db->escape_str($this->input->post('nuptk')),
                                    'pengawas_bidang_studi'=>$this->db->escape_str($this->input->post('pengawas_bidang_studi')),
                                    'tugas_tambahan'=>$this->db->escape_str($this->input->post('tugas_tambahan')),
                                    'id_status_kepegawaian'=>$this->db->escape_str($this->input->post('status_pegawai')),
                                    'id_status_keaktifan'=>$this->db->escape_str($this->input->post('status_aktif')),
                                    'id_jenis_ptk'=>$this->db->escape_str($this->input->post('jenis_ptk')),
                                    'id_status_pernikahan'=>$this->db->escape_str($this->input->post('status_pernikahan')),
                                    'foto'=>$hasil['file_name'],
                                    'niy_nigk'=>$this->db->escape_str($this->input->post('niy_nigk')),
                                    'sk_cpns'=>$this->db->escape_str($this->input->post('sk_cpns')),
                                    'sk_pengangkatan'=>$this->db->escape_str($this->input->post('sk_pengangkatan')),
                                    'tanggal_cpns'=>$this->db->escape_str($this->input->post('tanggal_cpns')),
                                    'tmt_pengangkatan'=>$this->db->escape_str($this->input->post('tmt_pengangkatan')),
                                    'lembaga_pengangkatan'=>$this->db->escape_str($this->input->post('lembaga_pengangkatan')),
                                    'id_golongan'=>$this->db->escape_str($this->input->post('id_golongan')),
                                    'sumber_gaji'=>$this->db->escape_str($this->input->post('sumber_gaji')),
                                    'nama_ibu_kandung'=>$this->db->escape_str($this->input->post('nama_ibu_kandung')),
                                    'nama_suami_istri'=>$this->db->escape_str($this->input->post('nama_suami_istri')),
                                    'pekerjaan_suami_istri'=>$this->db->escape_str($this->input->post('pekerjaan_suami_istri')),
                                    'nip_suami_istri'=>$this->db->escape_str($this->input->post('nip_suami_istri')),
                                    'tmt_pns'=>$this->db->escape_str($this->input->post('tmt_pns')),
                                    'lisensi_kepsek'=>$this->db->escape_str($this->input->post('lisensi_kepsek')),
                                    'jumlah_sekolah_binaan'=>$this->db->escape_str($this->input->post('jumlah_sekolah_binaan')),
                                    'diklat_kepengawasan'=>$this->db->escape_str($this->input->post('diklat_kepengawasan')),
                                    'mampu_handle_kk'=>$this->db->escape_str($this->input->post('mampu_handle_kk')),
                                    'keahlian_breile'=>$this->db->escape_str($this->input->post('keahlian_breile')),
                                    'keahlian_bahasa_isyarat'=>$this->db->escape_str($this->input->post('keahlian_bahasa_isyarat')),
                                    'npwp'=>$this->db->escape_str($this->input->post('npwp')));
                                    //'id_session'=>md5($this->input->post('a')));
            }else{
                    $datadb = array('nip'=>$this->db->escape_str($this->input->post('nip')),
                                    'nik'=>$this->db->escape_str($this->input->post('nik')),
                                    'id_jenis_kelamin'=>$this->db->escape_str($this->input->post('jenis_kelamin')),
                                    'nama_guru'=>$this->db->escape_str($this->input->post('nama_guru')),
                                    'tempat_lahir'=>$this->db->escape_str($this->input->post('tempat_lahir')),
                                    'tanggal_lahir'=>date('Ymd', strtotime(date($this->input->post('tanggal_lahir')))),    
                                    'id_agama'=>$this->db->escape_str($this->input->post('agama')),
                                    'alamat_jalan'=>$this->db->escape_str($this->input->post('alamat_jalan')),
                                    'rt'=>$this->db->escape_str($this->input->post('rt')),
                                    'rw'=>$this->db->escape_str($this->input->post('rw')),
                                    'nama_dusun'=>$this->db->escape_str($this->input->post('nama_dusun')),
                                    'desa_kelurahan'=>$this->db->escape_str($this->input->post('kelurahan')),
                                    'kecamatan'=>$this->db->escape_str($this->input->post('kecamatan')),
                                    'kode_pos'=>$this->db->escape_str($this->input->post('kode_pos')),
                                    'telepon'=>$this->db->escape_str($this->input->post('telepon')),
                                    'hp'=>$this->db->escape_str($this->input->post('hp')),
                                    'email'=>$this->db->escape_str($this->input->post('email')),
                                    'kewarganegaraan'=>$this->db->escape_str($this->input->post('kewarganegaraan')),
                                    'nuptk'=>$this->db->escape_str($this->input->post('nuptk')),
                                    'pengawas_bidang_studi'=>$this->db->escape_str($this->input->post('pengawas_bidang_studi')),
                                    'tugas_tambahan'=>$this->db->escape_str($this->input->post('tugas_tambahan')),
                                    'id_status_kepegawaian'=>$this->db->escape_str($this->input->post('status_pegawai')),
                                    'id_status_keaktifan'=>$this->db->escape_str($this->input->post('status_aktif')),
                                    'id_jenis_ptk'=>$this->db->escape_str($this->input->post('jenis_ptk')),
                                    'id_status_pernikahan'=>$this->db->escape_str($this->input->post('status_pernikahan')),
                                    'foto'=>$hasil['file_name'],
                                    'niy_nigk'=>$this->db->escape_str($this->input->post('niy_nigk')),
                                    'sk_cpns'=>$this->db->escape_str($this->input->post('sk_cpns')),
                                    'sk_pengangkatan'=>$this->db->escape_str($this->input->post('sk_pengangkatan')),
                                    'tanggal_cpns'=>$this->db->escape_str($this->input->post('tanggal_cpns')),
                                    'tmt_pengangkatan'=>$this->db->escape_str($this->input->post('tmt_pengangkatan')),
                                    'lembaga_pengangkatan'=>$this->db->escape_str($this->input->post('lembaga_pengangkatan')),
                                    'id_golongan'=>$this->db->escape_str($this->input->post('id_golongan')),
                                    'sumber_gaji'=>$this->db->escape_str($this->input->post('sumber_gaji')),
                                    'nama_ibu_kandung'=>$this->db->escape_str($this->input->post('nama_ibu_kandung')),
                                    'nama_suami_istri'=>$this->db->escape_str($this->input->post('nama_suami_istri')),
                                    'pekerjaan_suami_istri'=>$this->db->escape_str($this->input->post('pekerjaan_suami_istri')),
                                    'nip_suami_istri'=>$this->db->escape_str($this->input->post('nip_suami_istri')),
                                    'tmt_pns'=>$this->db->escape_str($this->input->post('tmt_pns')),
                                    'lisensi_kepsek'=>$this->db->escape_str($this->input->post('lisensi_kepsek')),
                                    'jumlah_sekolah_binaan'=>$this->db->escape_str($this->input->post('jumlah_sekolah_binaan')),
                                    'diklat_kepengawasan'=>$this->db->escape_str($this->input->post('diklat_kepengawasan')),
                                    'mampu_handle_kk'=>$this->db->escape_str($this->input->post('mampu_handle_kk')),
                                    'keahlian_breile'=>$this->db->escape_str($this->input->post('keahlian_breile')),
                                    'keahlian_bahasa_isyarat'=>$this->db->escape_str($this->input->post('keahlian_bahasa_isyarat')),
                                    'npwp'=>$this->db->escape_str($this->input->post('npwp')));
            }
        //$this->db->insert('rb_guru',$datadb);
 
        print_r ($datadb);
        exit;
    }
 
  <tr>
                                              <td>Foto</td>
                                              <td>
                                                  <div class="col-sm-4">
                                                      <input type="file" name="file">
                                                  </div>
                                              </td>
                                        </tr>
//view
 
 
penempatan path foldernya sudah benar