laravel 修改某一字段值

$update     = [
                    'update_id'   => $user->id,
                    'update_time' => time(),
                    'stock_number'=> DB::raw("stock_number + 1"), // 退還庫存
                    'sale_number' => DB::raw("sale_number - 1")// 減去銷量
              ];
$goodsState = DB::table('goods_integral')->where('goods_integral.id',$val->goods_id)->update($update); // 退還庫存