mongodb-query

问题 I have a collection that contains documents with a date attribute like so: { title: "whatever", created: ISODate("2013-05-27T03:36:50Z") } I would like to select records that were created on a certain day. I was hoping I could use toDateString() and compare the values but when I do a search like the one below: db.myCollection.find({ 'created.toDateString()': new Date('05/27/2013').toDateString() }).pretty() But this does not work. Is there any way to do what I am attempting above? 回答1: If you

问题 I have a mongo collection named 'comment' which has documents which have a structure similar to this : { "_id" : ObjectId("9873214jkhdkfjdsf8324"), "nm" : "test", "sts" : 1, "updby" : NumberLong(0), "tags" : [ { "name" : "women", "rank" : 1, "type" : 3 }, { "name" : "men", "rank" : 1 }, { "name" : "clothing", "rank" : 2, "type" : 1 } ] I want to query the collection using a mongo query which would look like this : db.comment.find({"tags":{ $all:[ {"$elemMatch":{"name" : "women", "type" : 3}},

问题 Mongoose var filter = {}; filter.strBillDate = { "$gte": new Date(req.params.fromdate), "$lt": new Date(req.params.todate) }; return Sales .aggregate([{ $match: filter }, { "$project": { "strBillNumber": 1, "strBillAmt": 1, "store_id": 1, "strBillDate": 1, "hourPart": { "$hour": "$strBillDate" }, "minutePart": { "$minute": "$strBillDate" }, } }, { "$match": { "hourPart": { "$gte": fromhour, "$lte": tohour } } }]) .exec(function(err, salesdata) { if (!err) { return res.send(salesdata); } });

问题 I am newbie to mongodb. I need to do a query by reference two collections using dbref and need to query particular fields. comments collection { uid:12345, pid:444, comment="blah" }, { uid:12345, pid:888, comment="asdf" }, { uid:99999, pid:444, comment="qwer" } users collection { uid:12345, name:"john" }, { uid:99999, name:"mia" } May I know the command how to insert these collections in mongodb by adding reference between two collections usind dbref? comments in uid must refer the users uid.

问题 I want to find only documents that have all 'docs.foo' present in a array. In my example I should get only _id: 2 result: { _id : 1, docs : [ { bar : 2}, { foo : 3, bar : 3} ] }, { _id : 2, docs : [ { foo : 2, bar : 2}, { foo : 3, bar : 3} ] } I thought about something like: db.collection.find({'docs.foo': {$nin: [$exists: false]}}) but couldn't make it work. 回答1: Using the $where operator. db.collection.find(function() { return this.docs.length === this.docs.filter(function(doc) { return

问题 How can I get unique booking counter? Like If I pass from date as "1970-01-01" and to date as "1970-01-05" then it will return me only 1. Because there is two booking but that's on different date (One is from 1970-01-01 to 1970-01-02 and another is from "1970-01-03" to "1970-01-05"). Reserved array contains all the booked rooms with from to to dates Here is my data: [ { "_id": "5c0a17013d8ca91bf4ee7885", "name": "ABC", "reserved": [ { "from": "1970-01-01", "to": "1970-01-02", "isCompleted":

问题 I've gone through MongoDB docs that explain how to configure encryption which is available in MongoDB Enterprise only. How to implement data at rest in MongoDB Community Edition v3.4? 回答1: I was asking the same question to myself just few month ago. This is a list of options I have found so far: encrypt storage volumes on the file system level. It is what Atlas offers, and most of cloud providers support: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html, https://docs

问题 sample document : {"name":"John", "age":35, "address":".....",.....} Employees whose join_month=3 is priority 1 Employees whose address contains the string "Avenue" is priority 2 Employees whose address contains the string "Street" is priority 3 Employees whose address contains the string "Road" is priority 4 As of now, I'm at this stage: db.collection.aggregate([ { "$match": { "$or": [ { "join_month": 3 }, { "address": /.*Avenue.*/i }, { "address": /.*Street.*/i }, { "address": /.*Road.*/i }

问题 i have written query for getting all user records exports.index = function(req, res) { Userdata.find(function(err, userdatas) { if (err) { return handleError(res, err); } console.log(userdatas); }); }; console i am getting below documents { "_id" : ObjectId("584bc9ba420a6b189c510af6"), "user_id" : 1, "price" : 2000.0, "type" : "credit", }, { "_id" : ObjectId("584bc9ba420a6b189c510af7"), "user_id" : 1, "price" : -1000.0, "type" : "credit", }, { "_id" : ObjectId("584bc9ba420a6b189c510af8"),

问题 this is my problem: db.Group6391102Bounds.insert({ bound:"latest",id:138548488276343678,complete:false}) db.Group6391102Bounds.find() { "_id" : ObjectId("5297d9e5ef9f659b82271617"), "bound" : "earliest", "id" : 138548488276343680, "complete" : false } { "_id" : ObjectId("5297dc28b2d702ea878b540d"), "bound" : "latest", "id" : 138548488276343680, "complete" : false } db.Group6391102Bounds.insert({ bound:"middle",id:138548488276343678,complete:false}) db.Group6391102Bounds.find() { "_id" :