mongodb-query

问题 I have below document structure in mongodb database: { "_id" : ObjectId("52ec7b43e4b048cd48499b35"), "eidlist" : [ { "eid" : "64286", "dst" : NumberLong(21044), "score" : 0 }, { "eid" : "65077", "dst" : NumberLong(21044), "score" : 0 } ], "src" : NumberLong(21047) } I would like to update score field of first object using Java-mongodb driver: I tried following code but it is not working :( : DBObject update_query=new BasicDBObject("src", key).append("eidlist.eid", e.getEdgeid()); DBObject

问题 Is it possible to execute comparison queries $gt , $lt , etc. of a Date against an ObjectId and vice versa? Does the mongodb driver cast this automatically? Does this mongodb server cast this automatically? 回答1: Yes and no. It is possible under the JavaScript based methods to get a date from the ObjectId value in which you can use for comparisons. It also should be possible to construct an ObjectId given a specific date value as well, but not seeing the utility of that though. But all are

问题 Is it possible to execute comparison queries $gt , $lt , etc. of a Date against an ObjectId and vice versa? Does the mongodb driver cast this automatically? Does this mongodb server cast this automatically? 回答1: Yes and no. It is possible under the JavaScript based methods to get a date from the ObjectId value in which you can use for comparisons. It also should be possible to construct an ObjectId given a specific date value as well, but not seeing the utility of that though. But all are

问题 I have a mongo collection which has documents which look like below : { "_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 such that I want all the documents which have "name": "women" and "type" : 3 inside the tags subdocument of each document which is returned. I know that the

问题 I tried finding solution for this online, but no success. This is the code: Invoice.count( { $expr: {$gt: [ "$totalAmount", "$remainingDebt" ]} } ).exec(callback); where totalAmount and remainingDebt are fields in schema Invoice. The result I get is: "unknown top level operator $expr". I am using mongoose 5.0.11 and mongo lab. Any ideas? 回答1: which version you are Using for the MongoDB since MLab is Providing the Maximum 3.6 version of the Mongo so you need to either modify the Query or

问题 This question is in continuation with older question: Parent.save() not working when sub document / deeply nested document is modified Say I have a document as below : { "apiCallCount": 1, "_id": "5e0da052b4b3fe5188602e11", "email": "abc@def.net", "password": "123123", "userName": "username", "companyName": "companyName", "apiKey": "apiKey", "solutionType": "solutionType", "parentCompany": "parentCompany", "buildings": [ { "gateways": [ { "devices": [ { "_id": "5e0da052b4b3fe5188602e15",

问题 I have this kind of structure into a Mongo collection : { "_id": "12345678", "Invoices": [ { "_id": "123456789", "Currency": "EUR", "DueTotalAmountInvoice": 768.3699999999999, "InvoiceDate": "2016-01-01 00:00:00.000", "Items": [ { "Item": 10, "ProductCode": "ABC567", "Quantity": 1 }, { "Item": 20, "ProductCode": "CDE987", "Quantity": 1 } ] }, { "_id": "87654321", "Currency": "EUR", "DueTotalAmountInvoice": 768.3699999999999, "InvoiceDate": "2016-01-01 00:00:00.000", "Items": [ { "Item": 30,

问题 Within a collection document there is a 'sub' property that is an object containing 1 or more properties. The collection looks like: (I've removes extraneous other properties) "properties": { "source": { "a/name": 12837, "a/different/name": 76129 } } I need to do a find on the collection where a/name and a/different/name are variables. The variables have embedded front slashes because they are mqtt topic names, in case you wonder. (node.js) I've tried: collection.find({'properties.source

问题 I want to paging my data in Mongodb . I use slice operator but can not paging my data. I wish to bring my row but can not paging in this row. I want to return only 2 rows of data source. How can resolve it My Query : db.getCollection('forms').find({ "_id": ObjectId("557e8c93a6df1a22041e0879"), "Questions._id": ObjectId("557e8c9fa6df1a22041e087b") }, { "Questions.$.DataSource": { "$slice": [0, 2] }, "_id": 0, "Questions.DataSourceItemCount": 1 }) My collection data : /* 1 */ { "_id" : ObjectId

问题 Consider this document from a collection of clients: client: { services: [ { _id: 111, someField: 'someVal' }, { _id: 222, someField: 'someVal' } ... // More services ] staff: [ { _id: 'aaa', someField: 'someVal', servicesProvided: [111, 222, 333, ...] }, { _id: 'bbb', someField: 'someVal', servicesProvided: [111, 555, 666, ...] }, { _id: 'ccc', someField: 'someVal', servicesProvided: [111, 888, 999, ...] } ... // More staff ] } A client can have many staff members. Each staff has a reference