gridfs | 易学教程

Display image in HTML from GridFS

阅读更多关于 Display image in HTML from GridFS

问题 I'm uploading an image in GridFS but have no idea how to display this in an <img > tag. I tried the following code: conn.once('open', function () { var gfs = Grid(conn.db, mongoose.mongo); gfs.files.find({ filename: 'img1.png' }).toArray(function (err, files) { if (err) { console.log(err); } console.log(files); }); }); I get the result: [ { _id: 5316f8b3840ccc8c2600003c, filename: 'img1.png', contentType: 'binary/octet-stream', length: 153017, chunkSize: 262144, uploadDate: Wed Mar 05 2014 15

分布式文件系统----GridFS

阅读更多关于分布式文件系统----GridFS

GridFS研究　　GridFS是MongoDB提供的用于持久化存储文件的模块，CMS使用MongoDB存储数据，使用GridFS可以快速集成开发。它的工作原理是：　　在GridFS存储文件是将文件分块存储，文件会按照256KB的大小分割成多个块进行存储，GridFS使用两个集合（collection）存储文件，一个集合是chunks，用于存储文件的二进制数据；一个集合是files，用于存储文件的元数据信息（文件名称、块大小、上传时间等信息）。从GridFS中读取文件要对文件的各各块进行组装、合并。详细参考：https://docs.mongodb.com/manual/core/gridfs/ 来源： https://www.cnblogs.com/yanxiaoge/p/11828457.html

Upload files to DEFAULT_FILE_STORAGE instead of GridFs with mongoengine

阅读更多关于 Upload files to DEFAULT_FILE_STORAGE instead of GridFs with mongoengine

问题 I want to be able to store files in amazon s3. The FileField in mongoengine seems to be hardcoded with gridfs. What can I do to achieve this? Is there a custom filefield out there, that behaves like the regular django FileField? 回答1: I havent seen an S3 FileField for use with MongoEngine - so currently, you'd have to roll your own implementation - you could use a StringField to store the location or you could create your own proxy_class like ImageField but it is quite tided to GridFs but I'm

Display Image in GridFS

阅读更多关于 Display Image in GridFS

问题 I am using gridfs-stream https://github.com/aheckmann/gridfs-stream & currently i am on displaying image from gridFS. When reading data it gives me following output. When i append this data to <img src="data:image/jpeg;base64,(data)"> , the image doesn't show. gfs // create a read stream from gfs... .createReadStream({ filename: 'error1.png' }) // and pipe it to Express' response .pipe(res); Output res :- Edited :- I tried this :- img.src = 'data:image/jpeg;base64,' + btoa(res); Output

Storing a file in mongodb using node.js

阅读更多关于 Storing a file in mongodb using node.js

Hi i need to store a file in mongodb using node.js, the file is placed in my desktop i will have to store it in my mongodb database.I came across something called gridfs but am not sure how to proceed further.Any help will be much appreciated While I don't recommend storing big files in Mongo, though it's possible, smaller files would be better. Simply read the file's text (if it's a text file), or binary (if it's in a binary format i.e executable). You can use the fs library to read the file and encode it accordingly. Then insert the data, stored in a variable, inside the database. var fs =

Convert Base64 image to raw binary with Node.js

阅读更多关于 Convert Base64 image to raw binary with Node.js

I have found posts that are close to what I'm looking for, but I have not been able to successfully implement what I want. Here is the general flow: Submit photo with rest of venue data, as base64 data Strip data prefix if it exists, so I have just the image base64 data var base64data = venue.image.replace(/^data:image\/png;base64,|^data:image\/jpeg;base64,|^data:image\/jpg;base64,|^data:image\/bmp;base64,/, ''); Store Base64 data in GridFS via MongoDB (I'm using gridfstore ) Then, I'd like to retrieve the image upon request as a raw image file via a URL. // generic images route server.get

MongoDB GridFS VS Directly disk IO

阅读更多关于 MongoDB GridFS VS Directly disk IO

Use MongoDB GridFS store images and images stored directly on disk What are the advantages? Main advantage in my opinion is easy files distribution across multiple servers when system start growing (sharding, replication). Easy improvement reads/writes speed. No need to care where to put new file. Files systems become slow with big amount of small files. 来源： https://stackoverflow.com/questions/6212990/mongodb-gridfs-vs-directly-disk-io

How can I specify a GridFS bucket?

阅读更多关于 How can I specify a GridFS bucket?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This is my express.js code to upload and download files to GridFS: var fs = require("fs"); var gridStream = require("gridfs-stream"); var mongoose = require("mongoose"); exports.init = function(app, db) { var grid = gridStream(db, mongoose.mongo); app.post("/UploadFile", function(request, response) { var file = request.files.UploadedFile; var meta = request.param("Meta"); var name = request.param("Name"); var stream = grid.createWriteStream( { filename: name, metadata: meta }); fs.createReadStream(file.path) .on("end", function() { response

Render Image Stored in Mongo (GridFS) with Node + Jade + Express

阅读更多关于 Render Image Stored in Mongo (GridFS) with Node + Jade + Express

问题 I have a small .png file stored in Mongo using GridFS. I would like to display the image in my web browser using Node + Express + Jade. I can retrieve the image fine e.g.: FileRepository.prototype.getFile = function(callback,id) { this.gs = new GridStore(this.db,id, 'r'); this.gs.open(callback); }; but I don't know how to render it using the Jade View Engine. There doesn't seem to be any information in the documentation. Can anyone point me in the right direction? Thanks! 回答1: I figured this

【转发】mongodb Gridfs操作

阅读更多关于【转发】mongodb Gridfs操作

原文链接： https://www.cnblogs.com/wangjing666/p/6844598.html GridFS 介绍 GridFS是MongoDB规范用于存储和检索大文件，如图片，音频文件，视频文件等。这是一种文件系统用来存储文件，但数据存储于MongoDB集合中。GridFS存储文件比其文档大小16MB限制的更大能力。 GridFS的划分一个文件分成块存储数据每个块在一个单独的文件，每个最大尺寸255K。 GridFS默认使用两个集合 fs.files 和 fs.chunks 存储该文件的元数据和块。每组块标识其唯一的_id ObjectID字段。fs.files切断作为父文件。 fs.chunks 文档 files_id 字段链接块到其父文件。以下是fs.files集合的样本文件： { "filename": "test.txt", "chunkSize": NumberInt(261120), "uploadDate": ISODate("2014-04-13T11:32:33.557Z"), "md5": "7b762939321e146569b07f72c62cca4f", "length": NumberInt(646) } 文件指定的文件名，块大小，上传日期，和长度。以下是 fs.chunks 文件的样本文件： { "files_id":