bson | 易学教程

Deserializing MongoDB BSON

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问题 I attempting to take a response from a REST service that queries an instance of MongoDB and parse the response into a Java object. The web service returns the response with a MIME type of html with a newline character separating each record that is returned (although I have the ability to adjust what the service returns). What is the easiest/most efficient way for converting the BSON response into a Java object? I have already created a template class in Java to store the data. Thanks in

What is the syntax for Dates in MongoDB running on MongoLab?

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问题 Instead of ObjectId('82he921he982he82') its "_id":{"$oid":"82he921he982he82"} for object Ids, but I have no idea how to create a date value in a document on MongoLab :s 回答1: If you are using one of the drivers, you create a date via that language's Date class. For instance, in Javascript (like Node.js) it would be 'new Date(11,11,11)'. If using the MongoLab REST API or admin UI you represent dates with this syntax: { "$date": "2010-10-28T23:07:11Z" } 回答2: Also if an item has: "dateAdded": { "

MongoDB unwind multiple arrays

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问题 In mongodb there are documents in the following structure: { "_id" : ObjectId("52d017d4b60fb046cdaf4851"), "dates" : [ 1399518702000, 1399126333000, 1399209192000, 1399027545000 ], "dress_number" : "4", "name" : "J. Evans", "numbers" : [ "5982", "5983", "5984", "5985" ] } Is it possible unwind data from multiple arrays and get only paired elements from arrays: { "dates": "1399518702000", "numbers": "5982" }, { "dates": "1399126333000", "numbers": "5983" }, { "dates": "1399209192000", "numbers

mongodb-go-driver/bson struct to bson.Document encoding

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问题 I'm working with https://github.com/mongodb/mongo-go-driver and currently trying to implement a partial update of such struct type NoteUpdate struct { ID string `json:"id,omitempty" bson:"_id,omitempty"` Title string `json:"title" bson:"title,omitempty"` Content string `json:"content" bson:"content,omitempty"` ChangedAt int64 `json:"changed_at" bson:"changed_at"` } For instance, if I have noteUpdate := NoteUpdate{ Title: "New Title" } Then I expect that the only "title" field in the stored

How to convert BSON to JSON with human-readable date format

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问题 I would like to transform a BSON dump of MongoDB to JSON. To do that, I'm using the bsondump tool provided with Mongo, but I get an output like : { "_id" : ObjectId( "5316d194b34f6a0c8776e187" ), "begin_date" : Date( 1394004372038 ), "foo" : "bar" } { "_id" : ObjectId( "5316d198b34f6a0c8776e188" ), "begin_date" : Date( 1394004407696 ), "foo" : "bar" } Can anyone tell me how to get the dates appear in a human readable format (e.g. hh:mm:ss dd/mm/yyyy ) ? Edit It looks like that a more recent

InsertMany Document in a MongoDB Collection using C# BsonArray

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问题 How to Insert more than one document in a Single statement using InsertMany() MongoDB Method in C# My MongoDB Database and Connections IMongoClient _client; IMongoDatabase _database; _client = new MongoClient(); _database = _client.GetDatabase("test"); var collection = _database.GetCollection<BsonDocument>("EmpInfo"); I'm having a Collection - BsonArray var EmpInfoArray = new BsonArray { new BsonDocument { {"EmpID", "100"}, {"EmpName", "John"}, {"EmpMobile", new BsonArray { new BsonDocument {

How to ignore nulls while unmarshalling a MongoDB document?

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问题 I would like to know if there's any approach that would allow me to ignore null types while unmarshalling a MongoDB document into a Go struct. Right now I have some auto-generate Go structs, something like this: type User struct { Name string `bson:"name"` Email string `bson:"email"` } Changing the types declared in this struct is not an option, and here's the problem; in a MongoDB database, which I do not have total control, some of the documents have been inserted with null values were

Has anyone found an efficient way to store BSON ObjectId values in an SQL database?

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问题 We are migrating some data from MySQL to Mongo and have been adding extra fields to some of our DB tables for the ObjectId value of the migrated data objects. At the moment we are storing them as varchar(24) latin1_general_ci which works fine. However, for efficient storage/indexing we probably should convert back to the 12-byte binary value. Unfortunately, MySQL only seems to have native integer support up to 8 bytes. Is there another option - binary perhaps? Update : I am migrating from

mongodb c# how to work with BSON document

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问题 I've spent MANY hours looking for the answer... This is very easy in PHP but I just can't put it together in C#(I'm new to C# and mongo...) I'm trying to iterate through all levels of a stored document. The document looks like this: { "_id": ObjectId("51f90101853bd88971ecdf27"), "fields": [ { "ID": ObjectId("51fd09498b080ee40c00514e"), "NAME": "ID", "TYPE": "Text" }, { "ID": ObjectId("51fd09a68b080ee40c0064db"), "NAME": "Title", "TYPE": "Text" }, { "ID": ObjectId("51fd09b28b080ee40c004d31"),

nlohmann 最优秀的C++序列化工具库详细入门教程

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本文首发于个人博客 https://kezunlin.me/post/f3c3eb8/ ，欢迎阅读最新内容！ tutorial to use nlohmann json for serializing data with modern cpp  Guide include #include <nlohmann/json.hpp> // for convenience using json = nlohmann::json; compile with -std=c++11 CMakeLists.txt # CMakeLists.txt find_package(nlohmann_json 3.2.0 REQUIRED) ... add_library(foo ...) ... target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json) Usage json demo { "pi": 3.141, "happy": true, "name": "Niels", "nothing": null, "answer": { "everything": 42 }, "list": [1, 0, 2], "object": {