mongoose update

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

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

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) }}/

MongoDB does not join, but sometimes we need to refer to other collection documents, this time we need to populate.We can populate a single document, multiple document, plain object, multiple plain objects, or all object returned by query.var mongoose = require (' Mongoose '); var Schema = Mongoose. Schema;var Personschema = new Schema ({ _id:number, name:

Mongoose implements DBRef to search for all subclass information, mongoosedbref Product table var Mongoose = require('mongoose');var Schema = Mongoose.Schema;var Product = new Schema({ image : { type : String }, description : { type : String }, price : { type : Number,

The convenience of Mongoose operation set is indeed not general, but it is mainly because you design the set in reference, however, it is a little troublesome for Mongoose to limit and identify the combination of sets when using ref to associate a set. But it doesn't matter. It's easy to use. 1. usage of the ref associated document in mongoose 2. query related

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Tags: nodejs red own creat mongod NEC Strong router bodyMongoDB Download/installMongoose NPM Install--save MongooseMongoose Database connectionConst MONGOOSE = require (' Mongoose ')Const Db_rul = ' MONGODB://LOCALHOST:27017/KOA2 'Mongoose.connect (Db_rul, function (err) {if (err) {Console.warn (' Database connection failed: ' +err)}else{console.log (' database successfully connected to: ' +db_rul )}}) Modu

1 Installing the Moogoose module, attaching the--save parameter add the package information to the Package.json fileNPM Install--save Moogoose2 Load the Moogoose module and connect to the databasevar mongoose = require (' Mongoose '); // Mongoose.connect (' Mongodb://mongod address IP (ipdress)/database name to be connected (databasename) '); Mongoose.connect (' mongodb://localhost/news ');3 Modeling (struc

Data Relationship mapping: ORMO:objectR:relationM:mappingThe operation of the database is the equivalent of manipulating the database by encapsulating it into the object and manipulating the object.Installation:NPM Install MongooseUsage examples:Const Mongoose=require (' Mongoose ')1. Connect to the databaseMongoose.connect (' mongodb://127.0.0.1:27017/edu ')2. Design the model structureConst Catschema=

There is no join feature in MongoDB, so joins and associated queries cannot be used with joins, the populate method is encapsulated in mongoose, and the field (property) can be specified as a reference to another schema when defining a schema. When querying a document, you can use the Populate method to find the specified field value for another document or document that is associated by referencing the Schema and ID. Here is a simple chestnut:"Scene"

Plug - insSchemas are pluggable, that is, they can apply pre-packaged capabilities to extend their functionality. This is a very powerful feature.Suppose we have several collection in our database, to add the last-modified functionality to them. It's easy to use plugins. Just create a plug-in and apply it to each schema://Lastmod.jsModule.exports = exports =functionlastmodifiedplugin (schema, options) {Schema.add ({lastmod:date}) Schema.pre (' Save ',function(next) { This. Lastmod =NewDate Next

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

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