31 questions
I would like to obtain a document with a key of 0001 (first and third) in the following documents.However, the nested depth of the value of 0001 is not unique.db.collection.find({0001:wildcard})I'm wo...
We are building our environment with a replica set configuration with MongoDB.The DB server, config server, is working properly.Unable to connect to mongos server.mThe mongos server is connected to th...
There is a table hoge with columns id, replyReply contains the id of the reply destination, and if there is no reply destination, it is null.Suppose you have the following data:{ id: 1, reply—Null},{ ...
I'm thinking of creating an app with image posting and image ranking functions on ios.So I am using AWS Dynamo DB, but I was wondering what to do with the structure of the database, so I asked you a q...
An array of arrays of all combinations of elements = 5 (e.g., 1, 2, ..., 20) is formed by extracting arbitrary three elements from an array 1 and arbitrary two elements (no duplication) from an array ...
I use MongoDB through Mongoose in Node.js.Think about the data that has the location information on the screen.{ location: { x —Number, y —Number }}You have defined a schema called .Therefore, I would...
I'm a beginner at Mongodb.If you start the mongo shell on the powershell of the window server (2016 Standard) where Mongodb is installed, you can use it without any problems as follows.PSC:\Users\Admi...
Recently, I have been worrying a lot about MongoDB's environment.Environment:·MongoDB Server 3.2.0 (*Created database using MongoDB API in Microsoft Azure's CosmosDB)·mongo_php_driver 1.4.3·mongo_php_...
The regular expression says there is a risk of Denial of Service Attacks (ReDOS) that increase processing time exponentially.http://blog.ohgaki.net/regex-dos-redosIn fact, running the following code i...
I am using TypeScript.I would like to determine the following unique constraint error. What should I do?Looking at the type definition of the MongoError object, it seems that there are only the messag...
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