mongodb-query

问题 I have been doing lots of search on how to merge data from multiple collections and then send it to the Template using the Template Helper Function client side. I referred to the solution given at : Merging collections in Meteor Below is my Code: Template HTML : <template name="search_results"> <div class="col-md-12"> {{#if Template.subscriptionsReady}} <table id="datatable" class="display" cellspacing="0" width="100%"> <thead> <tr> <th>Type</th> <th>Project Name</th> <th>_id</th> </tr> <

问题 Remove in momgodb using java not giving proper result. Am i missing something? My database is as below. My code for removeing records where index = "7" is as, BasicDBObject whereQuery = new BasicDBObject("nodes.index", new BasicDBObject("$eq", "7")); node_info.remove(whereQuery); It's returning all the records and deleting my complete database. What can be probably wrong.? 回答1: Instead of remove try $pull method code as below BasicDBObject match = new BasicDBObject("_id", object id here);

问题 its possible in mongodb do a query for find documents where the field is an array and all its elements satisfy a condition?. For example: { "_id" : ObjectId("53d63d0f5c7ff000227cd372"), "works" : [ { "code" : "A001", "items" : [ { "_id" : "534664b081362062015d1b77", "qty" : 6 }, { "_id" : "534ba71f394835a7e51dd938", "qty" : 5 } ], "name" : "Cambiar bombilla", "price" : 100, "Date" : "2014-07-30T09:43:17.593Z", "TechnicianId" : "538efd918163b19307c59e8e", "percent" : 2, "_id" : ObjectId(

问题 I have a document like this: _id: ObjectId("559c1d2ad8291bc9368b4568") tablename: "IWEO_IWBB" out_user: "pb" out_email: "email" out_date: "15.05.2015" and want to add array like this: "inventar": [ { "ean": "2", "name": "name2", "runtime": "0", "art": "null", "marker": "null", "stammkost": "null", "accepted": "0" }, { "ean": "1", "name": "name1", "runtime": "0", "art": "null", "marker": "null", "stammkost": "null", "accepted": "0" } ], In my old PHP-Server I used the code below to insert it.

问题 I have a mongoose model looking like that : "question": { "_id": "1234", "title": "Hi", "content": "Hello", "viewed": 34425, "answers": [{ "vote": 0, "date": "2015-12-21T13:03:14.334Z", "author": "john", "content": "hello", "comments": [] }, { "vote": 0, "date": "2015-12-21T13:05:27.411Z", "author": "patrick", "content": "bonjour", "comments": [] }] } I want to push a comment into question.answers[1].comment but I don't manage to do it with findOneAndUpdate . Here is what i've attempted :

问题 I'm trying to aggregate a collection in which there are documents that look like this: [ { "title" : 1984, "tags" : ['dystopia', apocalypse', 'future',....] }, .... ] And I have a criteria array of keywords, for instance: var keywords = ['future', 'google', 'cat',....] What I would like to achieve is to aggregate the collection in order to $group it according to a "convenience" criteria in order to sort the document by the one that contains the more of the keywords in its tags field. This

问题 I have a mongodb collection, let's call it rows containing documents with the following general structure: { "setid" : 154421, "date" : ISODate("2014-02-22T14:06:48.229Z"), "version" : 2, "data" : [ { "k" : "name", "v" : "ryan" }, { "k" : "points", "v" : "375" }, { "k" : "email", "v" : "ryan@123.com" } ], } There is no guarantee what values of k and v might populate the "data" property for any particular document (eg. other documents might have 5 k-v pairs with different key names in it). The

问题 UserDetails { "_id" : "5c23536f807caa1bec00e79b", "UID" : "1", "name" : "A", }, { "_id" : "5c23536f807caa1bec00e78b", "UID" : "2", "name" : "B", } UserProducts { "_id" : "5c23536f807caa1bec00e79c", "UPID" : "100", "UID" : "1" }, { "_id" : "5c23536f807caa1bec00e79c", "UPID" : "200", "UID" : "2" } Groups { "_id" : "5bb20d7556db6915846da55f", "members" : { "regularStudent" : [ "200" // UPID ], } } Step 1 I have to take UID from UserDetails check with UserProducts then take UPID from UserProducts

问题 I am newbie to mongodb (java). I need to execute list of commands(queries in relational) by using something similar to procedures in relational db. Is it possible in mongodb? 回答1: MongoDB has no real sense of stored procedures. It has server side functions however these functions: Do not work with sharding Are slow Must be evaled (Dr. Evil) Are only really designed to be used within Map Reduces to stop you from having to house mutiple copies of common code within many places. However you can

问题 I am new to MongoDB queries, and I understand the basics of find. However I haven't yet come to grips with $lookup, $project, $aggregate, $match, etc, which is pretty much needed to do anything fancy. And I need a fancy query 😃 See tricky issue below: Collections: schema { _id: 1, name: “Schema1”, } { _id: 2, name: “Schema2”, } device: { _id: 1, schema: 1, organisation: 2 } { _id: 2, schema: 1, organisation: 2 } { _id: 3, schema: 2, organisation: 2 } field: { _id: 1, organisation: 2, name: