mongoose update

Mongoose learning comprehension (recommended) and mongoose learning Comprehension 1. Create schemas How to Create schemas: var userSchema = new mongoose.Schema({ name: String, email: String, createdOn: Date }); Schemas has the following data types: String Number Date Boolean Buffer ObjectId Mixed Array In particular, the ObjectId, Mixed, and Array types must be described. The follow

Mongoose simple table connection query and Mongoose simple The original article is taken from my front-end blog. You are welcome to visit Http://www.hacke2.cn As I mentioned in this article, it is based on Node. js + jade + Mongoose mimic gokk. TV, at that time, the development was stopped because I deeply felt that I was wrong at that time. I should use two sche

Users collection:$ db.users.find ()Add another piece of data: (MongoDB is modeless, so you can add data in different formats)$ db.users.insert ({"username": "Zoe", "Group": "Reporter"})Then use Db.users.find () to view, as follows:To view the number of data:$ db.users.find (). Count ()query data by ID:$ db.users.find ({"_id": ObjectId ("584bc73ea635e489676cf5db")})Update data: (Match to the first article)$ db.users.update ({"username": "Zoe"}, {$set:

Mongoose getting started with mongooseNo matter what database you use as the db service, connect is an essential step. Method 1: @ Param {String} uri @ param {Object} options @ param {Function} callbackconnect (uri, [options], [callbakc]) returns the mongoose Object. connect ('mongodb: // localhost/test', {mongos: true}, function (err, result) {if (err) {console. log ('error ing to MongoDB Database. '+ err)

Data model and Base operation templateIn order to make the engineering structure clear, the establishment of data Model (SCHEMA) and the base operation template of adding and deleting and modifying are named as collection in database design (corresponding to the table definition in relational database) and stored in the Models folder.Creation of schema and model:Schema is the data schema in mongoose, which can be understood as the table structure defi

}, sex: {type: String }}); // select the set var monModel = db. model ('user', monSchema); // condition var del = {name: "Nick"}; monModel. remove (del, function (err, result) {if (err) {console. log (err);} else {console. log ("update");} db. close ();}); Modify data // Introduce the module var mongoose = require ('mongoose'); // connect to the database var db =

when calling its Delete method, because you will delete it from the database, not just the array.Populate existing documentIf we have an existing mongoose document and want to populate it with some path,mongoose >= 3.6 supports the Document#populate () method.Populating multiple existing documentIf we have one or more files, even simple objects (like the MapReduce output), we can populate them in

A burst of Byron teacher spoke about MongoDB's crud operations, including:How to create a new database (use dbname), delete a database (use dbname →db.dropdatabase ()), add data (db. CollectionName. Insert ({}) to view the data in the table (db. CollectionName. Find), sorted (sort), the data is too many to take the first few (. limit), skip the first few (. skip), limit and skip together in the time of the page is the most favorite, such as a page is 5, then. Limit (5). Skip (5*n).

document collections that match the criteriaModel.count(conditions, [callback])UpdateModel.update(conditions, update, [options], [callback])//查找并更新Model.findByIdAndUpdate(id, [update], [options], [callback])Model.findOneAndUpdate([conditions], [update], [options], [callback])Update modifier1}})//找到id=_id记录，并且将 views递增

mongoose. model. After obtaining the Model object, you can perform operations such as adding, deleting, modifying, and querying. Model objects include methods such as find (), findOne (), update (), and remove (), which are similar to the usage in mongo shell. Each of these methods has an optional callback. When you provide these callback, the execution result will be returned to you through this callback.

Database var db = mongoose.createconnection (' mongodb://127.0.0.1:27017/test '); Set data type var Monschema = new Mongooose. Schema ({ name:{type:string,default: "username"}, Age:{type:number}, sex:{type:string} ); Select Set var Monmodel = Db.model (' user ', Monschema); DataSet var content = {Name: "Nick", Age:23,sex: ' Male '}; Instantiate the object and insert the data var moninsert = new Monmodel (content); Moninsert.save (function (err) { if (err) { console.log (err); } else{ con

when defining a schema is consistent with the first parameter of the Mongoose.model. Get the Model object, you can perform additions and deletions to check and other operations. The model object has methods such as find (), FindOne (), update (), remove (), and so on, similar to our usage in the MONGO shell. These methods have an optional callback, and when you provide these callback, the results of the execution will be returned to you through this

Using mongoose allows us to better use the MongoDB database without having to write tedious business logic. Installation NPM Install Mongoose Initialize the use ofbefore using mongoose, you need to install node and MongoDB, which do not talk about node and MongoDB installation methods. var mongoose