public function add()
    {
        $barcode = $this->input->post('kd_brg');
        $nmbarcode = $this->input->post('nm_brg');

        //load library
        $this->load->library('zend');
        $this->zend->load('Zend/Barcode');
        $imageResource = Zend_Barcode::factory('code128','image', array('text' => $barcode), array())->draw();

        $imageName = $barcode.'.jpg';
        $imagePath = 'barcode/';
        imagejpeg($imageResource, $imagePath.$imageName);
        $pathBarcode = $imagePath.$imageName; //path image barcode ke dalam database;
        $cek = $this->db->query("SELECT * FROM barang where kd_barang='".$this->input->post('kd_brg')."'")->num_rows();
        if ($cek<=0)
        {
            $dataku=array(
                'kd_barang' => $this->input->post('kd_brg'),
                'nm_barang' => $this->input->post('nm_brg'),
                'satuan' =>  $this->input->post('satuan'),
                'harga_satuan' =>  $this->input->post('hrg_satuan'),
                'harga_jual' =>  $this->input->post('hrg_jual'),
                'stok_brg' =>  $this->input->post('stok_brg'),
                'minstok_brg' =>  $this->input->post('minstok_brg'),
                'image' => $pathBarcode
            );
            $this->m_barang->simpan($dataku);
            redirect('_admin/barang');
        }
        else
        {
            echo "<script>alert('Maaf data sudah ada')</script>";
            redirect('_admin/barang', 'refresh');
        }
    }