Mongodb and Jade

Mongo installation

Reference novice tutorial: www.runoob.com/mongodb/mon… Installation under Linux

Sudo apt - get the install libcurl4 openssl wget HTTP: / / https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1604-4.2.8.tgz# Select the appropriate version to downloadTar - ZXVF mongo - Linux - x86_64 - ubuntu1604-4.2.8. TGZ# decompressionMv mongo - SRC - r4.2.8 / usr /local/mongodb4                          Copy the decompression package to the specified directory
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You can create the data and log folders under Mongodb4, or you can follow the tutorial and choose to create them under /var/lib

sudo mkdir -p /var/lib/mongo
sudo mkdir -p /var/log/mongodb
sudo chown `whoami` /var/lib/mongo     # set permissions
sudo chown `whoami` /var/log/mongodb   # set permissions
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Starting the mongodb Service

mongod --dbpath /var/lib/mongo --logpath /var/log/mongodb/mongod.log --fork
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Go to the bin directory to start mongodb

$ cd /usr/local/mongodb4/bin
$ ./mongo

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Directing a profile

MongoDB is a document-oriented, Schema-independent database that can store any type of document data in a collection, making it ideal for Node.js applications (the data format it can handle is very similar to the data format in the front-end and back-end JS scripts, avoiding the need to convert back and forth between rows and data objects).

In this paper, Moogoose is used to quickly establish a model object for mongodb, which can realize the access and add, delete, change and check of mongodb database.

jade

Jade is a popular Node.js template engine that has the following characteristics:

1. Use indentation

With two Spaces by default, the following code can be interpreted as

ABC

 p
   span abc
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2. Use DocType5 for automatic insertion

Use the post-H5 docType

3. Block keyword

Block is a special keyword that allows other view files to be embedded in this location.

4. Enclose attributes in parentheses

A (href=#,another=attribute,dynamic=someVariable) My link easy to embed variables

5. Embed variables with #{}

p welcome back ,#{user.name}

Jade writes the template for the main page

index.jade

extends layout 
block body 
  if (authenticated)
    p Welcome back, #{me.first}
      a(href="/logout") Logout
  else    
    p Welcome new visitor 
    ul 
      li:  a(href="/login") Login 
      li:  a(href="/signup") Signup
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signup.jade

extents layout 
block body   
  form(action="/signup",method="POST",enctype='multipart/form-data')
    fieldset 
      legend Sign up
      p
        label First 
        input(name="user[first]",type="text")
      p 
        label Last 
        input(name="user[last]",type="text")
      p 
        label Email 
        input(name="user[email]",type="text")
      p 
        label Password 
        input(name="user[password]",type="password")
      p 
        button Submit 
      p 
        a(href="/") Go back

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login.jade

extend layout block body form(action="/login",method="POST",enctype='multipart/form-data') fieldset legend Log in if(signupEmail) p Congratulations on signing up! Please login below. p label Email li: a(href="/login") Login li: a(href="/signup") SignupCopy the code

signup.jade

extents layout 
block body   
  form(action="/signup",method="POST",enctype='multipart/form-data')
    fieldset 
      legend Sign up
      p
        label First 
        input(name="user[first]",type="text")
      p 
        label Last 
        input(name="user[last]",type="text")
      p 
        label Email 
        input(name="user[email]",type="text")
      p 
        label Password 
        input(name="user[password]",type="password")
      p 
        button Submit 
      p 
        a(href="/") Go back
​
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login.jade

extend layout block body form(action="/login",method="POST",enctype='multipart/form-data') fieldset legend Log in if(signupEmail) p Congratulations on signing up! Please login below. p label Email input(name="user[email]",type="text",value=signupEmail) p label Password input(name="user[password]",type="password") p button submit p a(href='/') Go backCopy the code

layout.jade

doctype 
html 
  head 
    title MongoDB example 
  body 
    h1 My first MongoDB app 
    hr
    block body
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Index.js defines the template rendering engine and places the Jade file under the default rendering folder /views

app.set('view engine'.'jade')
app.set('view options', {layout:false})
/* Define the route */
app.get('/'.function(req,res){
    res.render('index')
})
app.get('/login'.function(req,res){
    res.render('login')
})
app.get('/signup'.function(req,res){
    res.render('signup')})Copy the code

Mongodb connections and Modeling

/* * @Author: kkkokra * @Date: 2021-05-01 08:31:23 * @LastEditTime: 2021-05-02 22:59:41 * @FilePath: /mongodb-exercise/mongo.js */

var mongoose = require('mongoose');
// Connect to the database, this database needs to be established, and in the background to start the Mongo service, can connect successfully
mongoose.connect('mongodb://localhost/myWebsite');
// Create a connection object
var db=mongoose.connection
db.on('error'.console.error.bind(console.'connection error:'))
db.once('open'.function() {
    // we're connected! , a correct message is displayed indicating that the connection is successful
    console.log('we are connected! ')});// Create a document template
var userSchema=mongoose.Schema({
    firstName:String.lastName:String.email:String.password:String
})
//User is the model object of the User collection
var User=mongoose.model('User',userSchema)
//Event.ensureIndexes(function (err) {
    //if (err) return handleError(err);
/ /});
// Make sure all indexes are created
User.on('index'.function (err) {
    if (err) console.error(err);
    else console.log('ensure index') // error occurred during index creation
  })
// Expose the model object
module.exports = {mongoose,User}
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The login

app.get('/login'.function(req,res){
    res.render('login')
})
app.post('/login',multipartMiddleware,function(req,res){

  User.findOne({'email':req.body.user.email,'password':req.body.user.password}, function (err, person) {
    if (err) throw err;
    if(! person)return res.send('<p>User not found.Go back and try again</p>')
    console.log('login : find a person')
    req.session.logged_in=person._id.toString()
    console.log('1',req.session.logged_in)
    res.redirect('/')})Copy the code

registered

app.get('/signup'.function(req,res){
    res.render('signup')
})

app.post('/signup',multipartMiddleware,function(req,res){
    console.log(req.body)
    var newUser = new User(req.body.user);
    newUser.save(function(err){
        if(err) throw err
        else console.log('save the user information')
    })
    res.redirect('/login/'+req.body.user.email)
})
app.get('/login/:signupEmail'.function(req,res){
    res.render('login', {signUpEmail:req.params.signupEmail})
})
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Automatic login

app.use(function(req,res,next){
    console.log('2',req.session.logged_in,typeof(req.session.logged_in))
    if(req.session.logged_in){
        res.locals.authenticated=true
        User.findOne({'_id':req.session.logged_in}, function (err, person) {
            if (err) throw err;
            if(! person)return console.log('not exist')
            res.locals.me=person
            console.log('relogin: find a person ')
            next()
        })
    }
    else {
        res.locals.authenticated=false
        next()
    }
})
app.set('view engine'.'jade')
app.set('view options', {layout:false})
/* Define the route */
app.get('/'.function(req,res){
    res.render('index')
})
app.get('/login'.function(req,res){
    res.render('login')
})
app.post('/login',multipartMiddleware,function(req,res){

  User.findOne({'email':req.body.user.email,'password':req.body.user.password}, function (err, person) {
    if (err) throw err;
    if(! person)return res.send('<p>User not found.Go back and try again</p>')
    console.log('login : find a person')
    req.session.logged_in=person._id.toString()
    console.log('1',req.session.logged_in)
    res.redirect('/')})})Copy the code

The cancellation

app.get('/logout'.function(req,res){
  req.session.logged_in=null;
  res.redirect('/')})Copy the code

This completes the log-in and the code is uploaded to Github.