使用 Node.js/Express 和 Mongoose 在 MongoDB 中存储图像

Question

目前我使用 angular-file-upload 处理图像上传，我只是将图像保存到服务器的文件系统并在 HTML 中引用它。但是，我想尝试将图像直接存储在我为博客文章定义的架构内的数据库中。

var blogSchema = new Schema({
    title: String,
    author: String,
    body: String,
    likes: { type: Number, default: 0 },
    comments: [{ type: Schema.Types.ObjectId, ref: 'Comment' }],
    date: { type: Date, default: Date.now },
    imageURL: String   // instead of this

    image: // store it directly
});

"imageURL: String" stores the path to the image.

我想这样做，以便我可以拥有一个存储图像本身的字段。我在想我也许可以像我已经做的那样上传图像，而是在上传图像后转换图像并将其以二进制（或其他形式）存储在 Mongo 中。这可能吗？

谢谢！

Answer 1

下面的示例展示了如何使用 mongoose 将图像上传到 MongoDB。点击此链接查看original source

var express = require('express');
var fs = require('fs');
var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var imgPath = '/path/yourimage.png';

mongoose.connect('localhost', 'testing_storeImg');

var schema = new Schema({
    img: { data: Buffer, contentType: String }
});

var A = mongoose.model('A', schema);

mongoose.connection.on('open', function () {
  console.error('mongo is open');

  A.remove(function (err) {
    if (err) throw err;

    console.error('removed old docs');

    // store an img in binary in mongo
    var a = new A;
    a.img.data = fs.readFileSync(imgPath);
    a.img.contentType = 'image/png';
    a.save(function (err, a) {
      if (err) throw err;

      console.error('saved img to mongo');

      // start a demo server
      var server = express.createServer();
      server.get('/', function (req, res, next) {
        A.findById(a, function (err, doc) {
          if (err) return next(err);
          res.contentType(doc.img.contentType);
          res.send(doc.img.data);
        });
      });

      server.on('close', function () {
        console.error('dropping db');
        mongoose.connection.db.dropDatabase(function () {
          console.error('closing db connection');
          mongoose.connection.close();
        });
      });

      server.listen(3333, function (err) {
        var address = server.address();
        console.error('server listening on http://%s:%d', address.address, address.port);
        console.error('press CTRL+C to exit');
      });

      process.on('SIGINT', function () {
        server.close();
      });
    });
  });

});

Answer 2

router.get("/:i", function (req, res) {
    
   var dataGet = {_id: req.params.i}
    
   fileModel.findOne(dataGet).exec(function (err, doc) {

        if (err) {
            return next(err)
        }
    
        var base64dataa = new Buffer(doc.fileData,'binary').toString('base64');
    
        var ress = {
           fileData: base64dataa,
           mime: doc.mimeType,
           name: doc.fileName
        }

       // res.json(ress)
       res.contentType('image/jpeg')
       res.send(doc.fileData)
   })
})  
        
    
    
router.post('/display/', function (req, res) {

       var data = {
           file: req.body.fileData,
           mime: req.body.mime,
           name: req.body.name
       }
    
       res.json(data)
})

Answer 3

这是将数据保存到 mongodb 的代码。 data 是二进制的。我可以显示这个 'image/jpg,base64,{{data}}' 但我不明白如何显示base64data。

file.on('data', function (data) {
            buffer += data;

            var file = new fileModel({
                fileData: data
            })

var Busboy = require('busboy');

router.post('/upload', function (req, res) {

    var busboy = new Busboy({headers: req.headers});
    var base64data = "";
    var filetype = "";
    var name = "";
    var argum = [];
    var data2

    busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {

        var buffer = "";
        filetype = mimetype;
        name = filename;


        // file.setEncoding('base64');


        file.on('data', function (data) {
            buffer += data;

            var file = new fileModel({
                fileData: data
            })
            //
            file.save(function (err, file) {
                if (err) {
                    return next(err)
                }
                // res.json(201, newData)
                // console.log("Save in database" + file.desc)
            })
        });
        file.on('end', function () {
            base64data = buffer;
        });
    });


    busboy.on('field', function (fieldname, val, fieldnameTruncated, valTruncated) {

        argum.push(val);
    });
    busboy.on('finish', function () {
        var base64dataa = new Buffer(base64data, 'binary').toString('base64');
        res.json(base64dataa)
        var jsonBin = {
            base64data_: base64data, mime_: filetype, name_: name,
            owner_: argum[0], description_: argum[1]
        }

        // res.json(jsonBin)

        var file = new fileModel({
            fileData: jsonBin.base64data,
            mimeType: jsonBin.mime_,
            fileName: jsonBin.name_,
            fileOwner: jsonBin.owner_,
            desc: jsonBin.description_
        })
        //
        file.save(function (err, file) {
            if (err) {
                return next(err)
            }
            // res.json(201, newData)
            console.log("Save in database" + file.desc)
        })
    });

    req.pipe(busboy);
});