Implementing MongoDB Communication

1 adding dependencies

"MongoDB": "1.4.15", "express-session": "1.9.1", "Connect-mongo": "0.4.1", "Connect-flash": "0.1.1"

Where Connect-flash is used to record the login session (I do not know if it is right, because it is not carefully used)

App.js

var express = require (' Express '), var path = require (' path '), var favicon = require (' Serve-favicon '); var logger = require (' m Organ '), var cookieparser = require (' Cookie-parser '), var bodyparser = require (' Body-parser '), var routes = require ('./ Routes/index '); var users = require ('./routes/users '); var settings = require ('./settings ');//var app = Express (); var Session = require (' express-session '), var mongostore = require (' Connect-mongo ') (session), App.use (session ({resave: False, Saveuninitialized:true, Secret:settings.cookieSecret, Key:settings.db,//cookie name Cookie: {maxAge:        30},//30 days Store:new mongostore ({db:settings.db, host:settings.host, Port:settings.port}));//View engine Setupapp.set (' views ', Path.join (__dirname, ' views ')); App.set (' View engine ', ' E JS '), var flash = require (' Connect-flash '); App.use (Flash ());//Uncomment after placing your favicon in/public//app.use ( Favicon (__dirname + '/public/favicon.ico ')); aPp.use (Logger (' dev ')); App.use (Bodyparser.json ()); App.use (bodyparser.urlencoded ({extended:false})); App.use ( Cookieparser ()); App.use (Express.static (Path.join (__dirname, ' public '));//app.use ('/', routes);//app.use ('/users ', users '); Routes (app);//catch 404 and Forward to error handlerapp.use (function (req, res, next) {var err = new Error (    ' Not Found ');    Err.status = 404; Next (err);}); /error handlers//development error handler//would print Stacktraceif (App.get (' env ') = = = ' Development ') {App.use (fun        Ction (Err, req, res, next) {Res.status (Err.status | | 500);    Res.render (' error ', {message:err.message, error:err}); });} Production error handler//no stacktraces leaked to Userapp.use (function (err, req, res, next) {Res.status (err.stat US | |    500); Res.render (' error ', {message:err.message, error: {}}); Module.exports = app;

Index.js

var crypto = require (' crypto '), User = require ('. /models/user.js '); module.exports = function (APP) {app.get ('/', function (req, res) {res.render (' index ', {TITL    E: ' Home '});    });    App.get ('/reg ', function (req, res) {Res.render (' reg ', {title: ' Register '});    });    App.get ('/login ', function (req, res) {res.render (' login ', {title: ' Login '});    });    App.post ('/login ', function (req, res) {});    App.get ('/post ', function (req, res) {Res.render (' post ', {title: ' Publish '});    });    App.post ('/post ', function (req, res) {});    App.get ('/logout ', function (req, res) {});            App.post ('/reg ', function (req, res) {var name = req.body.name, password = Req.body.password,        Password_re = req.body[' password-repeat '];            Verify that the password entered by the user two times is consistent if (password_re! = password) {req.flash (' error ', ' two times entered password is inconsistent! '); Return Res.redirect ('/reg ');//Return to registration page}//Generate password MD5 value var MD5 = CRYPTO.CREatehash (' MD5 '), password = md5.update (Req.body.password). Digest (' Hex ');         var newuser = new User ({name:name, Password:password, email:req.body.email}); Check if the user name already exists user.get (newuser.name, function (err, user) {if (err) {Req.flash (                ' ERROR ', err);            return Res.redirect ('/');                } if (user) {Req.flash (' error ', ' Users already exist! ');                Return Res.redirect ('/reg ');//returns to registration page}//If not present, add user Newuser.save (function (err, user) {                    if (err) {Req.flash (' error ', err);                Return Res.redirect ('/reg ');//registration failed to return to the main album} Req.session.user = user;//user information stored in session                Req.flash (' success ', ' registered successfully! ');        Res.redirect ('/');//return home after successful registration);    }); });};

Setting.js (root directory)

/** * Created by Administrator on 2015/3/31. */module.exports = {    cookiesecret: ' MyBlog ',    db: ' blog ',    host: ' localhost ',    port:27017};

Db.js (Models

/** * Created by Administrator on 2015/3/31. */var settings = require ('.. /settings '),    Db = require (' MongoDB '). Db,    Connection = require (' MongoDB '). Connection,    Server = require (' MongoDB '). Server;module.exports = new Db (settings.db, New Server (Settings.host, Settings.port),    {safe:true});

User.js (models)

/** * Created by Administrator on 2015/3/31.    */var MongoDB = require ('./db '); function user (user) {this.name = User.Name;    This.password = User.password; This.email = User.email;}; Module.exports = user;//Store user Information User.prototype.save = function (callback) {//user document to be stored in the database var user = {Name:thi    S.name, Password:this.password, email:this.email};        Open Database Mongodb.open (function (err, db) {if (err) {return callback (ERR);//error, Return err information} Read the Users Collection db.collection (' Users ', function (err, collection) {if (err) {MongoDB.                Close ();                Return callback (ERR);//error, return ERR message}//insert user data into the Users collection Collection.insert (user, {                Safe:true}, function (err, user) {mongodb.close (); if (ERR) {return callback (ERR);//error, return ERR message} callback (NULL, user[0]);Success!        ERR is null and returns the stored user's document});    }); });};/            /read user Information User.get = function (name, callback) {//Open database Mongodb.open (function (err, db) {if (err) {  Return callback (ERR);//error, return ERR message}//Read Users collection db.collection (' Users ', function (err, collection)                {if (err) {mongodb.close ();                Return callback (ERR);//error, return ERR message}//Find user name (name key) value for name a document Collection.findone ({                Name:name}, function (err, user) {mongodb.close (); if (ERR) {return callback (ERR);//Failed! Returns the ERR message} callback (null, user);//success!        Returns the user information of the query});    }); });};

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Implementing MongoDB Communication