mongodb

问题 I am starting mongodb server using cmd with the following command: "C:/Program Files/MongoDB/Server/3.6/bin/mongod.exe" It starts the mongodb server perfectly. Now I need to do it via npm script. Below is my package.json file: package.json: "scripts": { "ng": "ng", "prestart": "start /b \"C:/Program Files/MongoDB/Server/3.6/bin/mongod.exe\"", "start": "ng serve | node server.js", "build": "ng build --prod", "test": "ng test", "lint": "ng lint", "e2e": "ng e2e" } Now when I hit npm start, it

问题 Here are the compound index and single index I have for this Collection: ///db.Collection.getIndexes() /* 1 */ { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "service.Collection" }, /* 2 */ { "v" : 2, "key" : { "FirstId" : 1, "SecondId" : 1, "CreationTime" : -1 }, "name" : "FirstIdSecondIdCreationTime", "collation" : { "locale" : "en", "caseLevel" : false, "caseFirst" : "off", "strength" : 1, "numericOrdering" : false, "alternate" : "non-ignorable", "maxVariable" : "punct",

问题 $ mongo MongoDB shell version v3.6.3 connecting to: mongodb://127.0.0.1:27017 2018-10-18T17:09:03.003+0530 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused 2018-10-18T17:09:03.004+0530 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed : connect@src/mongo/shell/mongo.js:251:13 @(connect):1:6 exception: connect failed 回答1: what OS are you using? In ubuntu you need to check

问题 I'm trying to integrate the Alpakka Mongo Connector into an application that heavily relies on the Akka libraries for stream processing. The application utilizes Akka HTTP as well. I am encountering a dependency issue at run-time. In particular, I'm getting a NoClassDefFoundError for some kind of Success/Failure wrappers when I try to use the MongoSink.insertOne method provided by the Mongo connector. A full stack-trace: java.lang.NoClassDefFoundError: com/mongodb/reactivestreams/client

问题 When using the MongoDB API in Java, I am trying to retrieve the value of two in a document that looks like this: data-id: "1234" one: two: "three" And I am running this: MongoCollection<Document> documents = ...; Document document = documents.find(Filters.eq("data-id", "1234")).first(); // Not null document.get("one"); // Not null document.get("one.two"); // This is null ((Document) document.get("one")).get("two"); // Not null After spending some time reading documentation and other Stack

问题 I want to update an array that I have in a mongo doc. The structure of which looks something like: { _id: id, myArray: [ {key1: val, key2: val, key3: val}, {key1: val, key2: val, key3: val}, {key1: val, key2: val, key3: val} ] } I need to be able to do something like the SQL equivalent of update WHERE. Namely, get this particular document in the collection by searching with id (which you can do trivially with MyDoc.update({_id: id}...); ) and then locate the specific object in the array based

问题 I want to update an array that I have in a mongo doc. The structure of which looks something like: { _id: id, myArray: [ {key1: val, key2: val, key3: val}, {key1: val, key2: val, key3: val}, {key1: val, key2: val, key3: val} ] } I need to be able to do something like the SQL equivalent of update WHERE. Namely, get this particular document in the collection by searching with id (which you can do trivially with MyDoc.update({_id: id}...); ) and then locate the specific object in the array based

问题 I have a document in my collection like { "_id" : ObjectId("5e3aaa7cdadc161d9c3e8014"), "carrierType" : "AIR", "carrierCode" : "TK", "flightNo" : "2134", "depLocationCode" : "DEL", "arrLocationCode" : "LHR", "depCountryCode" : "DELHI", "arrCountryCode" : "LONDON", "scheduledDepDateTime" : ISODate("2020-02-05T00:30:00Z") } { "_id" : ObjectId("5e3aaacddadc161d9c3e8015"), "carrierType" : "AIR", "carrierCode" : "TK", "flightNo" : "2021", "depLocationCode" : "DEL", "arrLocationCode" : "LHR",

问题 I am trying to connect to my database on MongoDB Atlas using mongoose. But every time it's giving me the following error: (node:2327) UnhandledPromiseRejectionWarning: Error: queryTxt ETIMEOUT cluster0-abjwg.gcp.mongodb.net at QueryReqWrap.onresolve [as oncomplete] (dns.js:206:19) (node:2327) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled