Recent questions tagged MongoDB

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mongodb - How to perform Update operations in GridFS (using Java)?

I am using Mongo-Java-Driver 2.13 I stored a PDF file (size 30mb) in GridFS. I am able to ... .setMetaData(newMetadata); outputFile.save(); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - how to mongoimport data to deployed meteor app?

UPDATE: this post applied to meteor.com free hosting, which has been shutdown and replaced with ... kanjifinderkanjifinder.csv --headerline See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - mongo update query given error

Coll.update(condition, new BasicDBObject("$set", data), true, true)) This is my update query in mongodb for ... some one knows plz reply Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Searching in mongo db using mongoose regex vs. text

Can anyone please explain the difference between: db.collection.find({ $text: { $search: "dog cat" } }) and Product ... we go for which one ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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987 views

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mongodb - create doc if not exist, else push to array

I have a document in the following form: { "_id" : ObjectId("4d2d8deff4e6c1d71fc29a07"), "user_id" : "714638ba-2e08 ... item. Can that be done? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb apply sort to lookup results

If I have a user and post collection {"_id": 1, "name": "User 1"} {"_id": 2, "name": "User ... maintaining other fields (name, post.title, etc) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Filter array using the $in operator in the $project stage

Right now, it's not possible to use the $in operator in the $filter array aggregation operator. Let's say this ... to get my desired results. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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mongodb aggregation php

I'm using mongodb 2.1 and how to translate this query into php db.counter.aggregate([ { $match:{ page_id:123456 } ... "$pageview"}} } ]); Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Removing white spaces (leading and trailing) from string value

I have imported a csv file in mongo using mongoimport and I want to remove leading and trailing white spaces ... leading and trailing spaces. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Can't get allowDiskUse:True to work with pymongo

I'm running into the aggregation result exceeds maximum document size (16MB) error with mongodb aggregation using pymongo ... 10000}] Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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961 views

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mongodb - How to reclaiming deleted space without `db.repairDatabase()`?

I want to shrink data files size by reclaiming deleted space, but I can't run db.repairDatabase(), because free disk space is not enough. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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972 views

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mongodb - Meteor Up deployment, can't use meteor mongo --url

I've recently deployed my Meteor app to a Digital Ocean droplet running Ubuntu 14.04 x32. I used Meteor Up ... and still keep using Meteor Up. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Node + Mongoose: Get last inserted ID?

I want to retrieve the last inserted _id, using mongoose as MongoDB wrapper for node.js. I've found the following ... s id Redirect to / Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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mongodb - Unable to start docker mongo image on windows

When starting the image I get the following error: 2019-02-27T17:09:41.095+0000 E STORAGE [initandlisten] ... this issue doesn't appear. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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mongodb TTL not removing documents

I have a simple schema like: { _id: String, // auto generated key: String, // there is a unique index on this ... ("2013-09-09T18:54:28Z") } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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mongodb - How to filter fields from a mongo document with the official mongo-go-driver

How can I filter fields with the mongo-go-driver. Tried it with findopt.Projection but no success. type fields ... the documents didn't change. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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mongodb - mongoimport choosing field type

When importing data from file (csv in my case) mongoimport automatically choose data type for each field. Is it ... as a numbers (NumberLong). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mongodb - Find by id with mgo

I would like to find a data by _id. I know that this data exists and that this _id exist (I've tested it with ... 15:42:18 Cookie_Id.go:128: OK See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mongodb - MongoCollection versus DBCollection java

When should you be using MongoCollection and when DBCollection? The same questions apply to DBObject, BasicDBObject, ... would be very welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mongodb - Mongo Sort by Count of Matches in Array

Lets say my test data is db.multiArr.insert({"ID" : "fruit1","Keys" : ["apple", "orange", "banana ... because fruit2 has both carrot and banana See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mongodb - Is data returned from Mongoose immutable?

I want to add to the return data from a mongoose query: User.findById(userId, function(err, data) { if (!err ... any way to append data here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

mongodb - mongo _id field duplicate key error

I have a collection with the _id field as a IP with type String. I'm using mongoose, but here's the error on the ... Throws dup key: { : null } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - How do I update fields of documents in mongo db using the java driver?

References: http://www.mongodb.org/display/DOCS/Java+Tutorial Still pretty new to mongo db but I'm trying ... the existing document in mongo See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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mongodb - mongo group and count with condition

I'm trying to group a set of documents and count them based on their value. For example { "_id" : 1, " ... how can I achieve the above result? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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982 views

1 answer

mongodb - Creating new Meteor collections on the fly

Is it possible to create new Meteor collections on-the-fly? I'd like to create foo_bar or bar_bar depending on ... : http://pastie.org/6411287 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

mongodb - Find whether someone got a birthday in the next 30 days with mongo

Let's say that we got a collection of users, each with a birthday in BSON type date format. How can we run a ... birthday in the next 30 days ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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969 views

1 answer

mongodb - Ordering a result set randomly in mongo

I've recently discovered that Mongo has no SQL equivalent to "ORDER BY RAND()" in it's command syntax ( ... how to solve this more elegantly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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mongodb - mongoexport E QUERY SyntaxError: Unexpected identifier

The issue seems straight forward. I have a database (test) and a collection called (users) so I run the command: ... due to a bad experience... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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