如何使用GridFS来存储使用Node.js和Mongoose的图像 [英] How to use GridFS to store images using Node.js and Mongoose

问题描述

我是Node.js的新手任何人都可以提供一个例子，说明如何使用GridFS来存储和检索二进制数据，如图像，使用Node.js和Mongoose？我需要直接访问GridFS吗？

解决方案

我不满意这里最高评价的答案，所以我提供新的一个：
我最终使用节点模块'gridfs-stream' （伟大的文档！），可以通过npm安装。
有了它，并且与mongoose组合可以看起来像这样：

  var fs = require（'fs ）; 
 var mongoose = require（mongoose）; 
 var Grid = require（'gridfs-stream'）; 
 var GridFS = Grid（mongoose.connection.db，mongoose.mongo）; 
 
函数putFile（path，name，callback）{
 var writestream = GridFS.createWriteStream（{
 filename：name 
}）; 
 writestream.on（'close'，function（file）{
 callback（null，file）; 
}）; 
 fs.createReadStream（path）.pipe（writestream）; 
} 
  

请注意，路径是本地系统上文件的路径。 p>

对于我的文件的读取功能，对于我的情况，我只需要将文件流式传输到浏览器（使用express）：

  try {
 var readstream = GridFS.createReadStream（{_ id：id}）; 
 readstream.pipe（res）; 
} catch（err）{
 log.error（err）; 
 return next（errors.create（404，File not found。））; 
} 
  

I am new to Node.js. Can anyone provide me an example of how to use GridFS for storing and retrieving binary data, such as images, using Node.js and Mongoose? Do I need to directly access GridFS?

解决方案

I was not satisfied with the highest rated answer here and so I'm providing a new one: I ended up using the node module 'gridfs-stream' (great documentation there!) which can be installed via npm. With it, and in combination with mongoose, it could look like this:

var fs = require('fs');
var mongoose = require("mongoose");
var Grid = require('gridfs-stream');
var GridFS = Grid(mongoose.connection.db, mongoose.mongo);

function putFile(path, name, callback) {
    var writestream = GridFS.createWriteStream({
        filename: name
    });
    writestream.on('close', function (file) {
      callback(null, file);
    });
    fs.createReadStream(path).pipe(writestream);
}

Note that path is the path of the file on the local system.

As for my read function of the file, for my case I just need to stream the file to the browser (using express):

try {
    var readstream = GridFS.createReadStream({_id: id});
    readstream.pipe(res);
} catch (err) {
    log.error(err);
    return next(errors.create(404, "File not found."));
}

这篇关于如何使用GridFS来存储使用Node.js和Mongoose的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！