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
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similiar to: stackoverflow.com/questions/10092282/….. BTW: @Daniel's answer doesn't touch upon GridFS, which IS suited for large objects.Geert-Jan– Geert-Jan2012-12-24 11:35:02 +00:00Commented Dec 24, 2012 at 11:35
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2 Answers
If your file size exceeds 16Mb, Mongo's maximum document size, you must use gridFS if you wish to store the files in your DB.
There's a very useful run down of the reasons to use gridFS here: http://docs.mongodb.org/manual/faq/developers/#faq-developers-when-to-use-gridfs
In terms of implementation in node (if using the nativ mongo driver):
var mongodb = require('mongodb')
, MongoClient = mongodb.MongoClient
, Grid = mongodb.Grid //use Grid via the native mongodb driver
;
Once you've setup you connection, when it comes to writing the file into gridFs
var grid = new Grid(db, 'fs'); //db being a handle to your database
var buffer = //read the file in to a buffer
//write the buffer out to mongo
grid.put(buffer, {metadata:{category:'text'}, content_type: 'text'}, function(err, fileInfo) {
if(err) {
//handle any errors here
}
});
1 Comment
Amanda G
@Rob-I'll give this a try and will update soon.Thanks alot for your suggestion
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 = require('fs');
// Read file with proper encoding...
var data = //...
// Insert into Mongo
mongo.insert({file: data});
When you want to retrieve the file from the database, you'd do the opposite. The process of encoding/decoding is different depending on the type of file.
4 Comments
Amanda G
fs will read the contents of the file but my requirement is to store the entire file say name.txt as it is into my mongodb. Do you have any idea?
Daniel
@AmandaG You can't store a file, as is, in a database. That's what a filesystem is for. You'd instead, store the contents of the file in the database.
Daniel
@AmandaG You can have a simple collection:
files that have a filename and contents key that would "replicate" the same effect as having it within a filesystem (sorta)Amanda G
:I stored the file contents into a variable and saved the variable into the mongodb ie data but when i tried retrieving i got the following output requestParam: '[object Object]' i did not get the data i stored.Any idea regarding this will be really helpful