Recent questions tagged MongoDB

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mongodb - Mongo field A greater than field B

i'm trying a simple query in Mongo which in MySQL would look like this. select * from emails where bounceCount ... the sentCount in that shell? 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 - "group by" queries on meteor collection

My data mongoDB: >db.CUSTOMER.find() {"Name": "A", "CreatedDate": "Wed Jan 29 2014"} {"Name": "B", " ... I can do to make it works? 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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1.0k views

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mongodb - Does Meteor have a distinct query for collections?

I'd like to return distinct fields in my collection. I know these are the docs for mongo operators, but I'm not ... "myField": 1 }); }); See Question&Answers more detail:os...

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

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1.5k views

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mongodb - Easiest way to copy/clone a mongoose document instance?

My approach would be to get the document instance, and create a new one from the instance fields. I am sure there is a better way to do it. 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 php - how to do "INNER JOIN"-like query

I'm using the Mongo PHP extension. My data looks like: users { "_id": "4ca30369fd0e910ecc000006", "login": "user11", ... u ON n.user_id = u.id See Question&Answers more detail:os...

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

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916 views

1 answer

mongodb - Docker: change folder where to store docker volumes

On my Ubuntu EC2 I host an application using docker containers. db data and upload data is being stored in ... this? Thank you in advance. 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 - Sort nested array of objects

I'm looking for a way to sort a nested array of objects. Here's an example: { answers : [ { name : ' ... how can I sort them in ascending order? See Question&Answers more detail:os...

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

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1.0k views

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mongodb - Mongo Query question $gt,$lt

I have a query below. I want get items between 4 and 6 so only a:1 should match because it has the value ... }}); > No documents were returned. See Question&Answers more detail:os...

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

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965 views

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mongodb find by comparing field values

Is it possible to express the following SQL query in mongodb: SELECT * FROM table AS t WHERE t.field1 > t. ... records even if we need only 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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1.2k views

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mongodb - How to save date properly?

I'm trying to save date (using C# official driver): val = DateTime.Parse(value).Date; //Here date is {11/11/ ... to save only the date I want? See Question&Answers more detail:os...

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

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1.0k views

1 answer

mongodb - How do you tell Mongo to sort a collection before limiting the results?

I want to select the most recent documents from a collection. The answer from this question mongodb: how to ... userLanguagePref: "Cantonese" } 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

1 answer

mongodb - Mongo: count the number of word occurrences in a set of documents

I have a set of documents in Mongo. Say: [ { summary:"This is good" }, { summary:"This is bad" }, ... I understand it to some degree already :) See Question&Answers more detail:os...

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

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906 views

1 answer

mongodb - How do I check if an index is being used

I have a mongodb replica set with a lot of databases, collections & indexes. We did a lot of refactor and optimization and, ... ); } } } } } } See Question&Answers more detail:os...

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

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984 views

1 answer

mongodb - "VersionError: No matching document found" error on Node.js/Mongoose

I'm relatively new to Node.js and Mongo/Mongoose, and I'm having a very difficult time troubleshooting a specific ... .emit (events.js:96:17) 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 - How to aggregate by date when a full timestamp is given in aggregation framework?

I have a collection of errors, so that every error carries a date field. How can I aggregate/count/group ... smart projection should be applied. 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 - Proper way to import json file to mongo

I've been trying to use mongo with some data imported, but I'm not able to use it properly with my ... object to obtain my desired result? See Question&Answers more detail:os...

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

0 votes

971 views

1 answer

mongodb - File write operations in mongo script?

Is this possible to write the query result to the file from mongo js script. I have searched a lot, but I didn't find ... to file ????<br/> } See Question&Answers more detail:os...

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

0 votes

784 views

1 answer

mongodb - Hadoop Map/Reduce vs built-In Map/Reduce

What are the key differences to do map/reduce work on MongoDB using Hadoop map/reduce vs built-in map/reduce of ... on data stored in mongodb? 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

1 answer

mongodb - Printing Mongo query output to a file while in the mongo shell

2 days old with Mongo and I have a SQL background so bear with me. As with mysql, it is very convenient to be ... of a question I posted on SO See Question&Answers more detail:os...

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

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979 views

1 answer

mongodb - Mongo: find items that don't have a certain field

How to search for documents in a collection that are missing a certain field in MongoDB? See Question&Answers more detail:os...

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

0 votes

907 views

1 answer

mongodb - Mongos Install/Setup in Elastic Beanstalk

Looking down the road at sharding, we would like to be able to have multiple mongos instances. The ... all the software installed. See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

mongodb - Python dictionary : removing u' chars

How do I remove u chars from the following dictionary? {u'name': u'A', u'primary_key': 1} This data is coming ... name': 'A', 'primary_key': 1} 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 - Why getting error mongod dead but subsys locked and Insufficient free space for journal files on Linux?

I have installed mongo-10gen mongo-10gen-server on Linux CentOS server. I followed the steps from Link. I ... space for journals, terminating See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

mongodb - How can I save multiple documents concurrently in Mongoose/Node.js?

At the moment I use save to add a single document. Suppose I have an array of documents that I wish ... is done would be problematic. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.2k views

1 answer

mongodb - Redirect output of mongo query to a csv file

I am using MongoDB 2.2.2 for 32-bit Windows7 machine. I have a complex aggregation query in a .js file. I ... query. Thanks for any help :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

885 views

1 answer

mongodb - Calculate the count of nested objects with C#

I am developing a software using ASP.Net core 2.0 web api. I need to calculate count of some fields in my ... I write that query in mongoDB? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

mongodb - Golang mgo getting empty objects

I'm trying to learn Go API development. I have a MongoDB instance running in a Docker container. I'm trying ... with robomongo if that helps. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

1 answer

mongodb - Sorting by maximum array field, ascending or descending

In my Meteor app, I have a collection of documents with an array of subdocuments that look like this: /* 1 */ ... API features are no good :( See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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