mongodb

问题 I'm amazed by the sync capabilities of Pouch and Couch DB, but I'm looking for for an alternative that will let me use my MongoDB databases for client-sync. Is there such thing? If there is, I'd like to hear your experience with it, what should I be aware of, if there are any catches, etc... 回答1: Minimongo is specifically what you are looking for. It was originally developed as part of the excellent Meteor framework, but it can now be used independently to get the local db store and

问题 JHipster offers sub-generators for deploying applications to cloud providers (such as Heroku and Openshift), but not for applications using MongoDB due to the fact that Mongeez requires admin privileges which of course is not possible within a PaaS environment. However, it should be possible to run JHipster + MongoDB on cloud providers as long as Mongeez is deactivated. I did the following (using Heroku): First, I manually exported the MongoDB database that was created by JHipster on my local

问题 Background: (using Eve and Mongo) I'm working in Python using the Eve REST provider library connecting and to a mongoDB to expose a number of REST endpoints from the database. I've had good luck using Eve so far, but I've run into a problem that might be a bit beyond what Eve can do natively. My problem is that my mongoDb document format has a field (called "slots"), whose value is a list/array of dictionaries/embedded-documents. So the mongoDB document structure is: { blah1: data1, blah2:

问题 I need to encrypt one field in a mongo document. What is the best way to do it? I use spring. There is spring annotation for it? 回答1: the encryption can be done for now only from java. here you have the same question asked last month this has been done already in ruby, so if you want to use jruby for this in your project take a look at this or you can wait until the MongoDB includes this in their API 回答2: You can use this library that adds support for @Encrypted annotation fields: <dependency

问题 There are many items in a collection, each has many records, some have records of new dates and some have week or/and month older. I need a query which returns latest last record of each item. In the case of .aggregate() I need that complete "data" filed. I want this result using mongodb $group, the record should be latest for each device. { "result" : [ { "_id" : 29, "gateway_id" : 1, "data" : [ { "r" : 203, "v" : 3002 }, { "r" : 221, "v" : 3006 } ], "device_id" : 29, "date_time" : "a" }, {

问题 I new to nodejs and trying implement mongodb insert of current timestamp as milliseconds using nodejs its getting inserted as double value. Can anyone help me how to insert this as NumberLong value. var data = { myId : uniqueId, Timestamp : Date.now(), ---> This one is getting inserted as double. userData : applicationData } } I also try to insert like this but its getting insert as String. var mongo=require('mongodb'); var Long = mongo.Long; var data = { myId : uniqueId, Timestamp : Long

问题 I'm trying to add a default collation to my mongodb collections. It's simple to create a new collection with a collation: db.createCollection(name, {collation:{locale:"en",strength:1}}) Unfortunately I looked through the docs and didn't see any db.updateCollection function. How am I supposed to add a collation without destroying and recreating all my documents in a new collection? 回答1: From the collation specifications, After the initial release of server version 3.4, many users will want to

问题 Using mongodb with NodeJS driver I have 2 collections. One for department and other for students. Sample data for Deparmtent. { "_id" : ObjectId("5a24d20590d3d12155f3094e"), "name" : "CSE", "hod" : "abc", "students" : [ ObjectId("5a2129172c3e542acb78c1f5"), ObjectId("5a2129172c3e542acb78c1f7"), ObjectId("5a2129172c3e542acb78c1f9"), ObjectId("5a2129172c3e542acb78c1fb") ] } { "_id" : ObjectId("5a24d20590d3d12155f3094f"), "name" : "IT", "hod" : "xyz", , "students" : [ ObjectId(

问题 I'm trying to update a mongodb document with mongoose in node.js When the field exists, the update works, but if the field does not exist, the update will not work. I want to add new fields to the document. the MongoDB query ($set) is working: db.getCollection('users').update({ 'uid': 'uid' }, { $set: { 'vehicle_status': 'bike' } }) But it will not work when done in mongoose. Using $set does not add a field. User.update({ uid: uid }, { $set: { vehicle_status: vehicleSatus } }, { multi: true }

问题 I'm trying to update a mongodb document with mongoose in node.js When the field exists, the update works, but if the field does not exist, the update will not work. I want to add new fields to the document. the MongoDB query ($set) is working: db.getCollection('users').update({ 'uid': 'uid' }, { $set: { 'vehicle_status': 'bike' } }) But it will not work when done in mongoose. Using $set does not add a field. User.update({ uid: uid }, { $set: { vehicle_status: vehicleSatus } }, { multi: true }