mongodb-query

How to rename/alias field(s) while fetching it from MongoDB through query using MongoDB-Node.JS native drive?

由 喜夏-厌秋 提交于 2019-12-07 03:59:13
问题 Consider the following code, which I am using to fetch the data from my local MongoDB server. var Db = require('mongodb').Db, MongoClient = require('mongodb').MongoClient, Server = require('mongodb').Server, ReplSetServers = require('mongodb').ReplSetServers, ObjectID = require('mongodb').ObjectID, Binary = require('mongodb').Binary, GridStore = require('mongodb').GridStore, Code = require('mongodb').Code, BSON = require('mongodb').pure().BSON, assert = require('assert'); var db = new Db(

MongoDB 2.6 Index set up, query using $or, $in, with limit and sort

由 大兔子大兔子 提交于 2019-12-07 02:38:23
问题 I have a somewhat complex query that is very critical to my application. $cur = $col->find( array ( '$or' => array( array('owner' => $my_id), array('owner' => array('$in' => $friends), 'perm.type' => array('$in' => array('P', 'F'))), array('owner' => array('$in' => $friends), 'perm.list' => $my_id) ) ) )->limit(10)->skip(0)->sort(array('ca' => -1)); The intention is to find the first 10 posts, sorted by their create time in desc order, which are: a). made by myself, or b). made by my friends

Mongodb remove item from array

由 主宰稳场 提交于 2019-12-07 02:20:19
问题 I'm trying to remove an element from an array using Java and haven't been successful... I have a "emailsInApp" collection and inside I have this: { "_id" : "750afe", "list" : [ "John@gmail.com", "Mike@gmail.com" ] } { "_id" : "711850", "list" : [ "example@gmail.com" ] } It holds for each id the registered emails. What I would like to do is: given an id and an email, remove that email from that appId. This is what I have atm and when I run it it doesn't change the array at all: DBCollection

Using golang and mgo, how do I search for a range of values in MongoDB?

由 孤人 提交于 2019-12-07 02:11:48
问题 I worked through the example on the mgo homepage, but I'm struggling to find a way to query a range of values. The line: searchResults, searchErr = SearchReading(bson.M{"k": key, "t": { $gte: start, $lte: end } }, limit) fails with: line67: syntax error: unexpected $ line67: missing type in composite literal I left out the non-essential bits of code... type Reading struct { K string "k" T int64 "t" V float64 "v" } func SearchReading(q interface{}, limit int) (searchResults []Reading,

MongoDB regex matching trouble

由 孤者浪人 提交于 2019-12-07 01:03:02
问题 Here is my MongoDB shell session; > db.foo.save({path: 'a:b'}) WriteResult({ "nInserted" : 1 }) > db.foo.findOne() { "_id" : ObjectId("58fedc47622e89329d123ee8"), "path" : "a:b" } > db.foo.save({path: 'a:b:c'}) WriteResult({ "nInserted" : 1 }) > db.foo.find({path: /a:[^:]+/}) { "_id" : ObjectId("58fedc47622e89329d123ee8"), "path" : "a:b" } { "_id" : ObjectId("58fedc57622e89329d123ee9"), "path" : "a:b:c" } > db.foo.find({path: /a:[a-z]+/}) { "_id" : ObjectId("58fedc47622e89329d123ee8"), "path"

How to remove a document from the capped collection?

由 只愿长相守 提交于 2019-12-06 23:43:21
问题 When I try to remove a document in collection in MongoDB . It didn't remove because the collection is capped . My question is why? And is there a solution or other function can remove the document in this case? 回答1: No You cannot delete documents from a capped collection. And there is no possible workaround. The only thing you can do is drop() the collection. 回答2: You can not use remove function for capped collection. There are some restrictions on capped collections. Also you can refer this

Auto increment sequence in mongodb using java

由 蓝咒 提交于 2019-12-06 23:33:47
问题 Hi I want to auto increment _id in mongodb using java. I am completely new to this. In the document I found the solution like this: db.counters.insert( { _id: "userid", seq: 0 } ) function getNextSequence(name) { var ret = db.counters.findAndModify( { query: { _id: name }, update: { $inc: { seq: 1 } }, new: true } ); return ret.seq; } db.users.insert( { _id: getNextSequence("userid"), name: "Sarah C." } ) Can any one suggest how do I do this using java ? I am completely new to this. 回答1:

MongoDB $redact to filter out some elements of an array

由 断了今生、忘了曾经 提交于 2019-12-06 23:22:06
问题 I am trying to formulate a query over the sample bios collection http://docs.mongodb.org/manual/reference/bios-example-collection/: Retrieve all persons and their awards that they received before receiving a Turing award. I have come up with this query: db.bios.aggregate([ {$match: {"awards.award" : "Turing Award"}}, {$project: {"award1": "$awards", "award2": "$awards", "first_name": "$name.first", "last_name": "$name.last"}}, {$unwind: "$award1"}, {$match: {"award1.award" : "Turing Award"}},

subtraction in mongo query does not work?

由 丶灬走出姿态 提交于 2019-12-06 22:36:27
I have a collection as follow: { "_id" : ObjectId("5491d65bf315c2726a19ffe0"), "tweetID" : NumberLong(535063274220687360), "tweetText" : "19 RT Toronto @SunNewsNetwork: WATCH: When it comes to taxes, regulations, and economic freedom, is Canada more \"American\" than America? http://t.co/D?", "retweetCount" : 1, "source" : "<a href=\"http://twitter.com\" rel=\"nofollow\">Twitter Web Client</a>", "Date" : ISODate("2014-11-19T04:00:00.000Z"), "Added" : ISODate("2014-11-19T04:00:00.000Z"), "tweetLat" : 0, "tweetLon" : 0, "url" : "http://t.co/DH0xj0YBwD ", "sentiment" : 18, "quality" : 0.4,

How to query date range on the MongoDB collection where the ISO date is stored in string field?

由 邮差的信 提交于 2019-12-06 19:56:47
问题 Scenario : Consider I am having a collection called MyCollection , with following data: { "_id" : 'MyUniqueID_01' "CreatedTime" : "2013-12-01T14:35:00Z", "LastModifiedTime" : "2013-12-01T13:25:00Z" } Now I want to query the MongoDB database where the above mentioned kind of data is in huge number of documents. And my query is based on date range i.e. using $gt , $gte , $lt & $lte So my query may be something like: db.MyCollection.find({ 'CreatedTime': {$gt: '2013-05-25T09:29:40.572Z'}})
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