mongoose performance

Tags: model number res workaround why turn art description functionFirst, define a goods (commodity) of the models varMongoose = require ('Mongoose'); varSchema =Mongoose. Schema; varProductschema =NewSchema ({"productId": String,"Producname": String,"Saleprice": Number,"productimage": String}); Module.exports=mongoose.model ("Good", Productschema,'Goods'); Two, in the definition of a users (user) models va

1, NPM start error, prompt port occupancyApp.js added App.listen (3000), delete can2. Skip to HTML pageEjs changed to Htmlapp.engine ('. html ', require (' Ejs ') __express); App.set (' View engine ', ' html ');Discover Route index.js file Add route router.get ('/login ', function (req, res, next) {Res.render (' login ', {title: ' Login '})3, the data is not queriedThe user collection does have data, but the query does notBased on the information collected online, try to save a piece of data and

Schema supports plugins so you can extend some of the featuresThe following example is when document save is customized to update the last modified date of the pluginLastMod.jsmodule.exports = exports = function Lastmodifiedplugin (schema, options) { schema.add ({lastmod:date}) C2/>schema.pre (' Save ', function (next) { this.lastmod = new Date next () }) if (Options Options.index) { schema.path (' Lastmod '). Index (Options.index) }}//game-schema.jsvar lastmod = require ('./ Las

UpdateThere are several ways to update the document. Let's take a look at the traditional Update methodTank.findbyid (ID, function (err, Tank) { if (err) return HandleError (err); Tank.size = "large"; Tank.save (err) { if (err) return HandleError (err); Res.send (tank); });The above code is the first to find out a dociment and then in the update. What if we don't want to find dociment to update directly?Tank.update ({_id:id}, {$set: {size: ' Large '}}, callback

For example, my code database code can be divided into Chinese and English sites. Each table has a site_code field to distinguish, The two sites are deployed on different people servers. In this case, we will use system environment variables to differentiate them, Set the environment variables in Mac Vim ~ /. Bash_profile Add a line of code export site_code = 'cn' In UNIX, run the export site_code = 'cn' command on the terminal. Enter the following command once after setting in Mac to see

Recently, you need to implement an HTTP service function in your project. Although you can implement HTTP sending and parsing by encapsulating the socket itself. However, considering that the network still has a large number of HTTP parsing source code, their own to achieve a little bit of trouble from scratch. So on the network to a lot of, see many implementation of HTTP code, no one does not reflect its lightweight features. However, although lightweight, in terms of the amount of code, for a

Tags: model Mon option. com family uri Add tags div Model.find(query, fields, options, callback) Model.find({ ‘some.value‘: 5 }, function (err, docs) { // docs is an array }); Model.findoneModel.findOne({ age: 5}, function (err, doc){ // doc is a Document }); Model.findbyidModel.findById(obj._id, function (err, doc){ // doc is a Document }); Model.countModel.count(conditions, callback); Model.removeModel.remove(conditions, callback); Model.distinctModel.distinct(field, condition

Create a connection using the Mongoose.connect () methodMongoose.conect (' Mongodb://localhost/myapp ');The above code is linked to the MyApp database of MongoDB via the default port 27017. We can also set some specific parameters for the URL:Mongoose.conect (' Mongodb://username:[email protected]:p ort/databasename?options ... ');OptionsThe Connect method can accept an options objectMongoose.connect (URI, options);Here is the Options key DB-Set which database to connect to Server-S

If a document has a field of type string array, such as {id:1,tags:[' AA ', ' BB ', ' cc '}, now to change the ' BB ' of the tags field to ' bb ', the previous way is to write:Articlemodel.find ({tags:{$all: [Doc.name]}},function(err,articles) {Articles.foreach (function(article) { for(varj = 0;j){ if(Article.tags[j] = = =doc.name) {Article.tags[j]=Req.body.name; Article.markmodified (' Tags '); Article.save (); Break; }

Recently developed too busy, there is no time to update the blog, want to use this blog to summarize the relevant experience, in case the following can be used:First, Antd1.onChange of undefined problem: it is possible that the form in the page has the same name, or the parent element of the time-out form does not have a unique key set.Wait for update ...Second, ES6Wait for update ...Third, Mongoose1. When querying, if you encounter an association relationship that queries multiple tables, you c

The specific code looks like this: var express = require (' Express '); var mongoose = require (' Mongoose '); var router = Express. Router (); var person = Mongoose.model (' person ', { id:number, name:string }); /* Add/* router.get ('/insert ', function (req, res) { var student = new Person ({ id:1, name: "Huop" }); Mongoose.connect ("Mongodb://localhost:27017/test"); Student.save (funct

Go to the Bin folder under the folder where MongoDB is installed, execute the command: MONGO, you can use MongoDB.After installing the mongoose, in App.js, first introduce mongoose this module:var mongoose = require (' Mongoose ');Connect to the corresponding database;Port number default link 27017;Test is the name of

Tags: informationProduct table var Mongoose = require(‘mongoose‘); var Schema = Mongoose.Schema; var Product = new Schema({ image : { type : String }, description : { type : String }, price : { type : Number, require : true }, probability : { type : Number,

var mongoose =require (' Mongoose ');var db = Mongoose.connect ("Mongodb://localhost:27001/test");//local library test databasevar Testschem = new Mongoose. Schema ({Name:{type:string},age:{type:number,default:0},Time:{type:date,default:date.now},Email:{type:string,default: '}});var testmodel =db.model (' test1 ', Testschem);//test1 Collectionvar testentity=new t

GitHub Address: Https://github.com/linguowei/myblogClone the project Git down;Analysis:# git clone https://github.com/linguowei/myblog.git# cd myblog# npm install# npm run build# CD admin # NPM Run build#. CD.. /# node app.js# localhost:7000# localhost:7000/adminRun the code;Install dependent packages here, as well as package build background projects and foreground projects# node app for running servicesApp.jsWhich is connected to the data:App.use (Router)Database connection + set up various ta

Build the Dumall database, create goods collections, import data files, or manually insert them yourself. MongoDB Installation and Environment building: http://www.cnblogs.com/ccyinghua/p/7887713.html to create a database and insert data, you can enter the MONGO operations database, insert operations in command line form, That is, after the successful start of MongoDB, as an administrator to open a command line window input MONGO, you can do some database operations, you can also download mongov

In the recent study of Nodejs, here are some APIs that use mongoose to manipulate MongoDB. Prelude: 1. Installation of Mongoose:var Mongoose = require (' Mongoose '); 2. Connecting Mongodb:mongoose.connect (' Mongodb://localhost/nodejs '); 3. CREATE TABLE structure, field: var Schema = MongoDB. Schema;var Movieschema = new Schema ({title:string,content:string,})