Recent questions tagged MongoDB

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mongodb - How to catch exception when creating MongoClient instance

I am using Mongo DB java driver to connect to mongo instance. Below is the code I am using to create ... instance is created correctly or not. 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 - Why do my MongooseJS ObjectIds fail the equality test?

Suppose I save and retrieve identical objects as follows var obj1, obj2; instance.save(function(err, saved) { obj1 ... . What is happening 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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mongodb - Spring boot / mongo wont create index with the index annotation

I have the following: @Document(collection = "linkmetadata") public class LinkMetaData { @Indexed(unique = true) private ... there is no index.. 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 - Concurrency in gopkg.in/mgo.v2 (Mongo, Go)

I wish to use MongoDB in webapp written in Go. Can I have one mgo.Session and use it concurrently in web app. ... that I need Copy and Close. 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 average aggregation query with no group

I am trying to get the average of a whole field using the aggregation framework in Mongo. However i ... . References: Mongo aggregation manual 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 - Get specific part of document

I'm trying Mongo db and I wonder if it's possible to only get a specific part of a document? For example I have: { " ... { x : 203, y : 102 }. 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 - Sorting on Multiple fields mongo DB

I have a query in mongo such that I want to give preference to the first field and then the second field. ... above. Am I doing anything wrong? 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 - mongorestore Failed: no reachable servers

I tried to restore mongo from dump but failed: mongorestore --port 27133 dump 2015-05- ... git version: 6186100ad0500c122a56f0a0e28ce1227ca4fc88 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 - Importing Date-datatype using mongoimport

I have many GB of data stored in PostgreSQL database and i need those to be imported into the MongoDB. I ... to export "MongoDate" through CSV? 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 - Best way to share database connection param with mongoose/node.js

I'm using Mongoose to manage a Mongo database. My connection file is quite simple: var mongoose = require(' ... pattern or some other method? 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 - Sort using MongoEngine?

How do I sort the query objects in MongoEngine, like I would in a regular mongodb query? http://www. ... display/DOCS/Sorting+and+Natural+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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mongodb - tar gzip mongo dump like MySQL

Is there anyway to tar gzip mongo dumps like you can do with MySQL dumps? For example, for mysqldumps, you can ... that didn't work. Any ideas? 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 - Subdocument index in mongo

What exactly happens when I call ensureIndex(data) when typical data looks like data:{name: "A",age:"B ... or something altogether different ? 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 calculate the running total using aggregate

I'm developing a simple financial app for keeping track of incomes and outcomes. For the sake of simplicity, ... solution. Thanks 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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mongodb - Does Mongoose provide access to previous value of property in pre('save')?

I'd like to compare the new/incoming value of a property with the previous value of that property (what is ... a facility for doing this? 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 - show dbs gives "Not Authorized to execute command" error

I've spent some time trying to figure out what is wrong but as I could not find out, I decided to ask ... I have tried uninstalling few times. 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 c# how to work with BSON document

I've spent MANY hours looking for the answer... This is very easy in PHP but I just can't put it together in ... going to want to write data.... 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 - Creating a database in Mongo: can't connect, get "connect failed"

I want to create a new database in Mongo. However, I'm having trouble connecting: :~$ mongo MongoDB shell ... to create a database. 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 - Importing JSON file using mongimport, keep getting `unexpected identifier`?

I'm trying to add a JSON file to mongodb using mongoimports from terminal, here: mongoimport --db my_db --collection ... [] } ] } 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 - Mongoose & unique field

I have the following schema with mongoose: var SimSchema = new Schema({ msisdn : { type : String , unique : ... indexes each time. Any idea? 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 - Make $elemMatch (projection) return all objects that match criteria

I will use the example from here { _id: 1, zipcode: 63109, students: [ { name: "john", school: 102, age: 10 } ... ", school: 102, age: 7 }]} 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 check if point is in polygon

mongo 2.6 I have some amount of stored polygons. And I have a point. I what to know if this point fits any ... . I would be grateful for help. 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 3.4.3 Permission denied wiredtiger_kv_engine.cpp 267 error with ubuntu 16

I'm having problems lauching mongod as a service: How is it possible that it works when I do sudo ... [Install] WantedBy=multi-user.target 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 - replica Set mongo docker-compose

I'm trying to configure a mongodb replicaSet using docker-compose, but when I stop the master container it ... getMongo().setSlaveOk(); EOF 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 - Initialize data on dockerized mongo

I'm running a dockerized mongo container. I'd like to create a mongo image with some initialized data. Any ideas? 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 - Update multiple documents by id set. Mongoose

I wonder if mongoose has some method to update multiple documents by id set. For example: for (var i = 0, ... array. Same question for find. See Question&Answers more detail:os...

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

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2.0k views

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mongodb - Starting mongod fork, ERROR: child process failed, exited with error number 1

In attempting to run the command mongod --fork --logpath /var/log/mongodb.log On a amazon ec2 32 bit ... file is created in the process. 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 Failed: error connecting to db server: no reachable servers

I installed mongodb in Ubuntu14.04 server I was not able to connect to mongodb via "mongoimport", "mongodump ... #keyFile=/path/to/keyfile See Question&Answers more detail:os...

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

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