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Models is a constructor that is compiled from the Schema definition. Examples of these model represent documents that can be stored and retrieved from the database. All document creation and retrieval in the database is handled by these model.1. Compile the first modelvar New Mongoose. Schema ({name: ' string ', Size: ' String ' }); var Tank = Mongoose.model (' Tank ', schema);The first parameter is the singular name of the model corresponding to the

Tags: cno mongodb no pretty expr established name mode TPS Operate with MongoDB via Mongoose. The mongoose is created by the model to create the corresponding collection in MongoDB, so that you pass the following code: mongoose.model(‘User‘, UserSchema); When creating a collection in the corresponding database, the first reaction will certainly infer that a ' User ' collection, but the fact is completely di

All calls to Nodejs are almost completely asynchronous, and all IO operations are known by callback functions. If an asynchronous call relies on another asynchronous call, it is possible to fall into the legendary callback hell if there is no promise.Bluebird implements the transformation of asynchronous callbacks into chained notation, and extends the APIs such as catch, finally, bind, and so on, which can help us focus on the error of each query.The information about promise and Bluebird found

1. IntroThe Mongoose schema supports data in object format, often with a bunch of potentially indefinite metadata or configuration information in the field. If the user table has 3 fields: Email: User Email Password: User password Meta: User meta information, because currently uncertain, the definition of type object, you can put the user nickname, age, QQ number, login registration time and so on To manipulate the Meta field design to the field o

Reprinted Please note:Theviper http://www.cnblogs.com/TheViper Let's take a look at the following example. This. login = function *(){....... VaR q = usermodel. findone ({Email: name, PWD: Pwd}); q. select ('_ id'); q.exe C (function (ERR, ID) {If (ERR) return handleerror (ERR); this. body = ID ;});} This is an Ajax login, but the response will return not found. The crux of the problem is that no response is returned. Why is no response returned? This is also quite easy to understand. Becau

Document can be retrieved through some model static helper methods.Any model method that involves specifying a query condition can be executed in two ways.When a callback function:is passed, the operation executes immediately and the result is passed to the callback.is not passed, returns a query instance, which provides a special query generation interface.In Mongoose 4,Query has the then () function, so it can be used as a promise.When a query is ex

1 {2 "__v": 1,3 " _id": "538f5f0f6195a184108c8bd8",4 " title": "GameTitle",5 "Item": [{6 " _id": "538f5f0f6195a184108c8bd6",7 "name": "ItemOne",8 "Men": [{9 " _id": "5390cccf0a84f41f37082874",Ten "user": "id22222222", One "Score": A }, { - " _id": "2390cccf0a84f41f37082873", - "user": "id33333333", the "Score": - }] - }, { - " _id": "538f5f0f6195a184108c8bd7", + "name": "Itemtwo", - "Men": [] + }], A "status": 1 at } - - - //code is: - var menschema = new

1. How to start the MongoDB databaseReference Address: http://www.runoob.com/mongodb/mongodb-window-install.htmlIn the location of the database installation, the Bin folder, enter Mongod--dbpath d:\data\dbD:\data\db is the folder where the data is saved2. Code1 varMongoose=require ('Mongoose');2 3 //connecting to a database4Mongoose.connect ('Mongodb://localhost/shu');5 //Create schema6 varSchema=Mongoose.

No nonsense, direct----------------------。 If your application uses only one database, you should use Mongoose.connect. If you need to create additional connections, use Mongoose.createconnection. var mongoose = require (' Mongoose '); Mongoose.connect (Mongodb://localhost/chihuo);The Mongoose.createconnection return value is a new connection. If you open a separate connection using mongoose.createconnectio

set the value of a field, the following code is equivalent to the preceding: coll.update({name:"ZhangSan"},{$set: {password:"567890"}}); Managing Databases with Mongoosenode. JS has a database driver for MongoDB: MongoDB. You can install it using NPM install MongoDB. However, although the direct use of the MongoDB module is powerful and flexible, but some cumbersome, I will use Mongoose bar. If you are interested in the original driver module, you ca

Nodejs, who started this week in Monday, has been studying for 5 days, and it's been a rookie period, and I've seen a lot of unexpected pits and lots of nodejs. Their content is too old for 2011-2013 years. Many statements module code framework is not used in a lot of pits through my Kind of pits pit pit finally made a very simple and practical express new version of the +mongoose and additions and deletions to the novice is very helpful code is 2015.

A problem that can be easily encountered when querying all the results of a document using Mongoose Articlecontents.getall = function (name, callback) { var query = {}; if (name) { query.name = name; } Articlecontentsmodel.find (///four parameters, where the second cannot be omitted (the second parameter is the result set to query out which document structure is included) Query,null, { so

1 /********** User table by Jaysir 2015.6.212 ***********3 *********** can search the following keywords to view the features that are not implemented4 *********** 5 *********** TODO: Not completed6 *********** Done: Completed7 *********** totest: Pending Test8 *********** notest: no test required9 *********** Waiting: function to be determinedTen *********** One *********** Interface: (not implemented to add groups, change the group of Friends and other functions) A *********** findonebyemai

First:create counter collection in MongoDB:> Db.counters.insert ({_id: "EntityId", seq:0})Writeresult ({"ninserted": 1})Then put below in a model.js:var Counterschema = Schema ({_id: {type:string, required:true},Seq: {type:number, default:0}});var counter = Mongoose.model (' counter ', Counterschema);var Entityschema = Mongoose. Schema ({TestValue: {type:string}});Entityschema.pre (' Save ', function (next) {var doc = this;Counter.findbyidandupdate ({

Remember the following points before you begin validation defined in SchemaType Validation is an internal middleware Validation occurs before document is to be save Validation does not occur on null values unless the corresponding field is added with required validator You can customize the validator Built-in Validator All SchemaType have required validators. Number has min and Max validators String has enum and match validator Custom Validator

The restfull routes are as follows:Router.get ('/:id ', controller.show);The Mongoes code is as follows:function (req, res) { function ( err, notice){if(err) { Res.json ({no: 0,msg: ' Get failed: ' +err} '; } Else { var result = {no:1}; Result.obj=notice; Res.json (result); } );};Client Access:Http://192.168.0.165:9000/api/notices/11The printing results are as follows;{"no": 0,"msg": "Get failed: Casterror:cast to ObjectId failed for value \" 11\ "at path \" _id\

Label:Nodejs operation MongoDB can use Mongoose:Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment.Install Mongoose:NPM Install MongooseGet MongoDB Connectionvar conn = mongoose.connect (' mongodb://localhost/mytest ');var Schema = Mongoose. Schema, ObjectId = Schema.objectid;var person = new Schema ({Title: {type:string}, age: {type:number, Min:5, max:20}, Meta: {Likes: [String], Birth: {type:date}}});var p = m

1 Installing MongooseNPM Install MongooseInstallation Successful2. Open the DatabaseMongod--path E:\mongoSuccessCreate a Db.jsvar mongoose = require (' Mongoose '); Mongoose.connect (' Mongodb://127.0.0.1:27017/whhhh ', {usemongoclient:true}); var db = Mongoose.connection;db.on (' Error ', Console.error.bind (console, ' connection error: '));d b.once (' Open ', function ( Callback) { console.log ("databa

Label:Mongoose Library in short, a convenient package for manipulating MongoDB databases in the node environment, an object model tool similar to Orm,mongoose converts data from a database into JavaScript objects for you to use in your app. Of course, you have to install the Environment node. js and MongoDB = "MongoDB installation MongoDB is one of the most popular NoSQL databases, developed specifically for node. JS, and understands the difference be

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