mongodb-query

问题 In my current project , I am storing the location data in the following format in a Mongodb document "location" : { "loc" : { "lng" : -118.15592692, "lat" : 34.03566804 }, "geocode" : { "city" : "East Los Angeles", "state" : "CA", "zipcode" : "90022", "countrycode" : "US", "country" : "United States" } } There is a 2d index created on location.loc field:- { "location.loc" : "2d" } But the geospatial queries are taking long time when the result set is large i.e more than 7000 records. it seems

问题 Here is my MongoDB collection schema: company: String model: String cons: [String] // array of tags that were marked as "cons" pros: [String] // array of tags that were marked as "pros" I need to aggregate it so I get the following output: [{ "_id": { "company": "Lenovo", "model": "T400" }, "tags": { tag: "SomeTag" pros: 124 // number of times, "SomeTag" tag was found in "pros" array in `Lenovo T400` cons: 345 // number of times, "SomeTag" tag was found in "cons" array in `Lenovo T400` } }...

问题 How can transpose mongodb document list to tabular form? Example: I have the following list of BsonDocuments [0] = { "_id" : ObjectId("546ce80d43f5c2b7d8a713bd"), "Address" : "61- A, Pocket- C, Ram Vihar Phase II, UP", "Pincode" : 110091, "Locality" : "Mayur Vihar Phase II", "City" : "Delhi", "Latitude" : 28.618156, "Longitude" : 76.3055877 } [1] = { "_id" : ObjectId("546ce80d43f5c2b7d8a713bd"), "Address" : "61- A, Pocket- C, Phase II, Rahi", "Pincode" : 110091, "Locality" : "Mayur Vihar

问题 Query for a MongoDB: From a given collection (see example below) I need only objects listed that comprise fields, where the field name starts with "need_". Example of a collection with three objects /* 1 */ { "_id" : 1, "need_some" : "A", "need_more" : 1, "website_id" : "123456789" } /* 2 */ { "_id" : 2, "need_more" : 2, "website_id" : "123456789" } /* 3 */ { "_id" : 3, "website_id" : "123456789" } Desired Output: /* 1 */ { "_id" : 1, "need_some" : "A", "need_more" : 1, "website_id" :

问题 I am working on an existing project. Here using multiple database. I am struggling to connect the server database with username and password. Currently now I am using local database without username and password. It's working fine. I am using mongodb npm module. db.js var mongodb = require('mongodb'); module.exports.init = function (callback) { var server = new mongodbs.Server('localhost', 27017, {}) //var server = new mongodbs.Server('abc.com', 27017, username , password, {}) module.exports

问题 I have documents in mongodb are like : [{ "_id" : 1, "name" : "Himanshu", "tags" : ["member", "active"] },{ "_id" : 2, "name" : "Teotia", "tags" : ["employer", "withdrawal"] },{ "_id" : 3, "name" : "John", "tags" : ["member", "deactive"] },{ "_id" : 4, "name" : "Haris", "tags" : ["employer", "action"] }] What I want to search here is if we have array of filter like {"tags" : ["member", "act"]} it will reply back id's 1 and 2 because here member is full match and act partial match in two

问题 I am using mongoDB I use query db.getCollection('managements').find({'managers.role':"HR"},{'managers.$':1}) I get result as below /* 1 */ { "_id" : ObjectId("1"), "managers" : [ { "id" : "100", "role" : "HR" }, { "id" : "101", "role" : "ADMIN" }, { "id" : "102", "role" : "ADMIN" } ] } /* 2 */ { "_id" : ObjectId("2"), "managers" : [ { "id" : "104", "role" : "ADMIN" }, { "id" : "105", "role" : "HR" } , { "id" : "106", "role" : "HR" } , { "id" : "107", "role" : "HR" } ] } Now I want to get

问题 I am using mongo v3.0.1 on a ubuntu machine. And I have a collection of 300million rows. I have created two indexes based on my query preference. When I am trying to run aggregation with explain, It is taking the inefficient index, and that is why it's taking 20-25 secs more time. Is there any way to put $hint , so that my aggregation query use the appropriate index. $match is in my first pipeline stage. I have two indexes: "Host_-1_SiteType_-1" "VisitTime_-1_AccountId_-1_Host_-1_SiteType_-1

问题 I'm a noob in mongoDb i need to implement Pagination for any specific Collection for instance say I have a Collection Foo and i have a Fucntion that returns all the records from the Foo collection public List<Foo> getFoo(){ } But i need to fetch records from the Foo by implementing pagination how can i achieve this by using mongoTemplate Spring data mongodb? 回答1: For general pagination you can use the .skip() and .limit() modifiers on the Query object which you can pass in as arguments to

问题 I have two Schema defined as below: var WorksnapsTimeEntry = BaseSchema.extend({ student: { type: Schema.ObjectId, ref: 'Student' }, timeEntries: { type: Object } }); var StudentSchema = BaseSchema.extend({ firstName: { type: String, trim: true, default: '' // validate: [validateLocalStrategyProperty, 'Please fill in your first name'] }, lastName: { type: String, trim: true, default: '' // validate: [validateLocalStrategyProperty, 'Please fill in your last name'] }, displayName: { type: