Use nodejs+express+mongodb to complete the data persistence project (with modified source code)

utilize nodejs+express+mongodb Complete the data persistence project

Additions and deletions

• Available console view mongodb Whether the database data is successfully stored

A problem encountered , Back to id Attribute values are quoted . Special attention

Using mongodb Before database storage , Remember to open the database , Then connect to the database

student.js Core code ：

var mongoose = require('mongoose');
mongoose.connect('mongodb://127.0.0.1/test');
var Schema = mongoose.Schema;

var studentSchema = new Schema({
    
    name: {
    
        type: String,
        required: true
    },
    sex: {
    
        type: Number,
        //  Enumerate these numbers 
        enum: [0, 1],
        default: 1
    },
    age: {
    
        type: Number
    },
    hover: {
    
        type: String
    }
})

//  Export the model constructor directly 
module.exports = mongoose.model('Student', studentSchema)

router.js Modify the core code

//  Routing module design set 

var fs = require('fs');
var path = require('path');
var Student = require('./student');
/* Student.updataByid({ id: 1, name: " Li Si ", age: 19 }, function (err) { if (err) { return console.log(' Modification failed '); } console.log(' Modification successful '); }) */
var express = require('express');
//  Create a routing container 
var router = express.Router();
//  Mount the router to router In the container 
router.get('/students', function (req, res) {
    
    //  Parameter 2 is optional , hold uft8 Characters are converted into strings we know 
    /* fs.readFile(path.join(__dirname, './db.json'), 'utf8', function (err, data) { if (err) { //  Status code 500, Server error  console.log(" Something went wrong "); // return res.status(500).send('Server error.'); } res.render('index.html', { //  The data read from the file must be a string  //  So we must turn it into an object  students: JSON.parse(data).student }); }) */

    Student.find(function (err, students) {
    
        if (err) {
    
            return res.status(500).send('Server error.');
        }
        res.render('index.html', {
    
            students: students
        });
    })
})
router.get('/students/new', function (req, res) {
    
    res.render('new.html');
})
router.post('/students/new', function (req, res) {
    
    /* 1. Get form data  2. Handle ( Save the data in db.json Achieve persistence ) 3. Send a response  */
    // console.log(req.body);
    //  Read it out first , Turn to object 
    //  Then go to the object push data , Then turn the object into a string 
    //  Then write the string to the file again 
    var student = req.body;
    new Student(student).save(function (err) {
    
        if (err) {
    
            return res.status(500).send('Server error.');
        }
        res.redirect('/students');
    })

})
router.get('/students/edit', function (req, res) {
    
    //  Handle connection problems in the list of clients ( Need to have id Parameters )
    //  Get the students to edit 
    //  Render edit page "1. according to id Find out the student information , Then the template engine renders the page 
    // console.log(req.query.id); Can get id
    //  Turn the obtained string into Wie Without quotation marks id data 
    //  Regular expression patterns 
    Student.findById(req.query.id.replace(/"/g, ''), function (err, student) {
    
        if (err) {
    
            return res.status(500).send('Server error.');
        }
        //  see ID Student ：console.log(student);
        res.render('edit.html', {
    
            student: student
        })
    })

})
router.post('/students/edit', function (req, res) {
    
    //  Get form data 
    //  to update 
    // Struend.updataId()
    // console.log(req.body);
    var id = req.body.id.replace(/"/g, '')
    Student.findByIdAndUpdate(id, req.body, function (err) {
    
        if (err) {
    
            return res.status(500).send('Server error.');
        }
    })
    res.redirect('/students')
})
router.get('/students/delete', function (req, res) {
    
    // 1. Get the id
    // 2、 according to id Delete 
    // 3. Send the response data according to the operation result 
    // console.log(req.query.id);
    var id = req.query.id.replace(/"/g, '')
    Student.findByIdAndRemove(Aid, function (err) {
    
        if (err) {
    
            return res.status(500).send('Server error.');
        }
        res.redirect('/students')
    })
})

//  hold router export 
module.exports = router;