mongodb

问题 For instance, I have a collection User : var mongoose = require('mongoose'); var UserSchema = new mongoose.Schema({ email: String, googleId: String, facebookId: String, displayName: String, active: Boolean }); module.exports = mongoose.model('User', UserSchema); And then I have an ID: var userID = "some-user-id" What is the right way to just check if this id exists in the User collection. I don't need it to read the file or return it, I just need the true or false value. Here is one way to

问题 For instance, I have a collection User : var mongoose = require('mongoose'); var UserSchema = new mongoose.Schema({ email: String, googleId: String, facebookId: String, displayName: String, active: Boolean }); module.exports = mongoose.model('User', UserSchema); And then I have an ID: var userID = "some-user-id" What is the right way to just check if this id exists in the User collection. I don't need it to read the file or return it, I just need the true or false value. Here is one way to

问题 For instance, I have a collection User : var mongoose = require('mongoose'); var UserSchema = new mongoose.Schema({ email: String, googleId: String, facebookId: String, displayName: String, active: Boolean }); module.exports = mongoose.model('User', UserSchema); And then I have an ID: var userID = "some-user-id" What is the right way to just check if this id exists in the User collection. I don't need it to read the file or return it, I just need the true or false value. Here is one way to

问题 Can you use mongodump to dump the latest "x" documents from a collection? For example, in the mongo shell you can execute: db.stats.find().sort({$natural:-1}).limit(10); Is this same capability available to mongodump? I guess the workaround would be to dump the above documents into a new temporary collection and mongodump the entire temp collection, but would be great to just be able to do this via mongodump. Thanks in advance, Michael 回答1: mongodump does not fully expose the cursor

问题 private void showdataTable_btnActionPerformed(java.awt.event.ActionEvent evt) { try { DateFormat df = new SimpleDateFormat("YYYY-mm-dd'T'HH:MM:ss'Z'"); //set date format String set = df.format(dateChoos1.getDate()); //add value to set BasicDBObject whereQuery = new BasicDBObject(); whereQuery.put("datetimes", set); //where date via set(date) DBCursor cursor = table.find(whereQuery); while (cursor.hasNext()) { DBObject obj = cursor.next(); String ip_address = (String) obj.get("ip_address");

问题 I am developing using express js and npm module mongodb with mongodb as database. I have two collections namely "users" and "activities". There can be 1000s of activities of a User. Firstly I am storing id, name and picture url of the user into the activity document for relation. Please tell me if this is wrong for relations and suggest something for storing the relation. Secondly the problem I am facing now is when I update a user's name it doesn't get updated in the activities of the user

问题 I'm trying to get Laravel MongoDB working in my local machine (Windows 10 home, x64) by following this tutorial I have installed XAMPP 7.3.11 on D:\xampp succesfully and tested that the server can be reached (enter localhost:80 on browser) I proceeded on extracting php_mongodb.dll I got from pecl(mongodb 1.6.0 for Windows, 7.3 Non Thread Safe, x64 ) on D:\xampp\php\ext and add the line extension=php_mongodb.dll on the file D:\xampp\php\php.ini After selecting 'the command-line PHP you want to

问题 I have been developing a simple app.py, here is the code: from flask import Flask, request, jsonify, make_response from pymongo import MongoClient from bson import ObjectId app = Flask(__name__) client = MongoClient("mongodb://127.0.0.1:27017") db = client.bizDB businesses = db.biz @app.route("/api/v1.0/businesses", methods=["GET"]) def show_all_businesses(): page_num, page_size = 1, 10 if request.args.get("pn"): page_num = int(request.args.get("pn")) if request.args.get("ps"): page_size =

问题 I'm working with mongodb stitch/realm and I'm trying to modify objects inside an array with a foreach and also pushing ids into a new array. For each object that i'm modifying, I'm also doing a query first, after the document is found I start modifying the object and then pushing the id into another array so I can use both arrays later. The code is something like this: exports = function(orgLoc_id, data){ var HttpStatus = require('http-status-codes'); // Access DB const db_name = context

问题 I am facing an issue in laravel 'like' query. I have a MIS on laravel with databases on MongoDb. Now my DB has a table named kw with urlencoded keywords like cars%20in%20London , Now my query gives accurate results for cars or cars%20in%20London but when I search cars%20in I get 0 results! This is how laravel 'like' is used in query but Mongo uses /. m ./ form, How can I make this working. Here is my Model function public static function selectKeywordIncomplete($keyword) { $search_volume