Here your not declared the variable(collection) so that only you got this error.You need to declare that variable with proper collection name. For Example : If you are going to find the records in users collection under test schema you need to the follow the below code. var express = require(‘express’); var router = express.Router(); … Read more
You can get some inspiration for updating a document in the quick-tour documentation provided on the MongoDB site: http://mongodb.github.io/mongo-csharp-driver/2.5/getting_started/quick_tour/ Just look at the Updating Document section. But to save a click you can use the following code as an inspiration: // Setup the connection to the database var client = new MongoClient(“mongodb://localhost”); var database = … Read more
You can’t run MongoDB natively on Android. You could however build a web service application with MongoDB for storage, and call methods on this webservice from your Android application.
You need to pass the _id value as an ObjectID, not a string: var mongodb = require(‘mongodb’); router.delete(‘/contact/:id’, (req, res, next) => { contact.deleteOne({ _id: new mongodb.ObjectID(req.params._id) }, function(err, result) { if (err) { res.json(err); } else { res.json(result); } }); });
You need to write a backend API that will be used by your frontend/desktop application. The technology you use is up to you – it can be Node, Python, Ruby, Java, Go, Lua, Perl or even C. If you use Node then you can use Express, if you use Python then you can use Django, … Read more
Use aggregation db.UserData.aggregate({$group:{_id:”$category”, “maxValue”:{$max:”$value”}}});
The second option is a real lack of security. It means that you will send to your users your mongodb login/password or even worse give them a non secured mongodb url. To you really want that your user can see other users data ? You should definitely use the first solution with a middleware. Further … Read more
You can use Mongoose, it help you to work with MongoDB easier. Record.findOne({ ip: ipAdress, filename_full: filename }).sort({ ‘pieces’: -1 }).exec(function(err, doc) { }); Reference: Mongoose doc , Get max value in mongoose
This page is useful for translate SQL to mongo querys http://www.querymongo.com
First of all it’s a bad idea to connect to the Database directly. It is possible, but it’a a bad idea. It’s a much better practice to create a web service backend that your app can connect to. This will allow you to implement the business logic on the server. And additionally, you will be … Read more