mongoose legion

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

the UserID query in the Doctor table to the corresponding entry and pass the information into the req.body.doctorObject. As you can guess, this code is reusable. Of course, this code reuse situation will be more limited, because it is rough, on this point, the following will give a more comprehensive code of reuse. To run the command line in the project folder, run the command: Node Server.js If there are no errors, the following prompt is available: The hint content is defined in Server.js.

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Lenovo recently launched a lenovolegion gaming device--legiony720 for VR games. The notebook allows the game to be converted into VR form, and is equipped with a domineering design, with a 15.6-inch screen and an Intel I5-7300NQ processor, with the

InquireBefore our collection has been created successfully, let's start with the first step--query.There are many types of queries, such as conditional query, filter query, and so on, today we only learn the most basic find query.Example :1.find

Official Document code:1 varschema =NewSchema (..);2Schema.post (' Save ',function(DOC) {3Console.log (' This fired after a document is saved ');4 });5 6 varModel = Mongoose.model (' model '), schema);7 8 varm =NewModel (..);9M.save (function(err)

Compile your first modelvar xxschema = new Schema ({name: ' string ', Size: ' String '}), var Tank = Mongoose.model (' Tank ', Schema);Construct documentDocument is an example of model. Creating updated document to data is easyvar Tank =

Conditional queryModel.find (conditions, [fields], [options], [callback])Demo1Try.jsvarUser = require ("./user.js"); function getbyconditions () {varWherestr = {'username':'xiaoming'}; User.find (WHERESTR, function (err, res) {if(Err) {Console.log ("

var Commentschema = { Data:{type:objectid, ref: ' Data '},//data data table, where data ID from:{type:objectid is stored, ref: ' User '},/ /USER User table, save user ID replay:[ {from : {type:objectid, ref: ' User '}, to

1. When using mongoose, install mongoose first. Open the command line and execute $ npminstallmongoose2. Connect to the mongodb database and add the following two lines of code to app. js. [Javascript] varmongooserequire ( amp; #39; mongoose amp; #39;); mongoose. con... 1. When using

Node. JS Database Chapter--mongoose ODM Introduction MongooseAlmost all languages have a native database connection driver, this we have learned on the last time, such as Java Jdbc,mysql-connector, but the actual development in order to pursue efficiency will not use the original connection, not always establish a connection, the last one, Our registration and landing each write a connection operation, at least we should encapsulate a database connect

1. When using mongoose, install mongoose first, open the command line, and execute $ npm install mongoose 2. Connect to the mongodb database and add the following two lines of code in app. js. [Javascript]Var mongoose = require ('mongoose ');

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This example is based on the previous logindemo (see using cookies to stay logged in ) and we introduced MongoDB to save user data. To run this example, if the MongoDB data is going to work (see node. JS Development Primer--mongodb and Mongoose). The result of the run of the example is the same as the previous Logindemo. So, let's just analyze the changes in the project itself when the database is introduced.Installing MongooseUnder command-line envir

when adding skip () and limit (), a parameter of true is required. Otherwise, the total number of results that match the query criteria is returned Fuzzy query: Db.collection.find ({"Name":/ab/}) The above is a common query, if the work encountered more complex requirements, you can check the document to solve. 3.7 Using Visual Tools4 Mongoose 4.1 Mongoose IntroductionMongoose Library in short, a conve