使用Base64将文件发送到mlab数据库存储

Question

我正在尝试将base64与节点rest api端点一起使用。这是我来自路由器文件product.js的代码，其中我为文件和其他数据定义了中间件：

public List<EngMwoReschedulingTxn> AddMwoReschedule(DateChange dateChange)
{
    DateTime dt = new DateTime();
    dt = dateChange.RescheduleDate;
    conn.Query<DataTable>("update DataTable set TargetDateTime='" + dt + "' where WorkOrderId='"+engMwoReschedulingTxn.WorkOrderId+"'");
}

我有一个名为“ uploads”的空文件夹，这是 app.js的代码：

router.post("/", upload.any('productImage'), (req, res, next) => {
  var fileInfo = [];
  for (var i = 0; i < req.files.length; i++) {
    fileInfo.push({
      "originalName": req.files[i].originalName,
      "size": req.files[i].size,
      "b64": new Buffer(fs.readFileSync(req.files[i].filename)).toString("base64")
    });
    fs.unlink(req.files[i].path);
  }
  res.send(fileInfo);

  const product = new Product({
    _id: new mongoose.Types.ObjectId(),
    name: req.body.name,
    price: req.body.price,
    // productImage: req.file.filename,
    reference: req.body.reference,
    description: req.body.description,
    quantity: req.body.quantity,
    date: req.body.date,
    category: req.body.category,
    newProduct: req.body.newProduct,
    relatedProduct: req.body.relatedProduct,
  });
  product
    .save()
    .then(result => {
      console.log(result);
      res.status(201).json({
        message: "Created product successfully",
        createdProduct: {
          name: result.name,
          price: result.price,
          _id: result._id,
          request: {
            type: 'GET',
            url: "https://booksbackend.herokuapp.com/products/" + result._id
          }
        }
      });
    })
    .catch(err => {
      console.log(err);
      res.status(500).json({
        error: err
      });
    });
}); 

我不确定代码是否正确。通过邮递员出错：

var fs = require("fs");
var multer = require("multer");
const productRoutes = require("./api/routes/products");
const userRoutes = require("./api/routes/user");

mongoose.connect(
  "mongodb://****:*****@ds141661.mlab.com:41661/books-database", {
    useMongoClient: true
  }
);
mongoose.Promise = global.Promise;

app.use(morgan("dev"));
app.use('/uploads', express.static('uploads'));
app.use(bodyParser.urlencoded({
  extended: true
}));
app.use(bodyParser.json());  

我是使用base64的新手，请帮忙。