React + Nodejs + Mysql full stack

Chapter one establishes the local basic environment for front-end full stack development

1-1 Course introduction

Preparation of the development environment
1. The installationNodejs
2. The first oneNodejsThe program
3. Nodejs 和 npmintroduce
4. introducenodemonTo achieve hot start
5. usenrmTo solvenpmThe source of the problem
6. usenvmmanagementNodejsVersion of the problem
WebApplication base
1. WebApplication andExpressintroduce
2. useExpressBuild the first oneWebservice
3. Routing (Routing)
4. Middleware (Middleware) introduction and use
5. Custom authoring middleware
6. Exception handling
7. MysqlInstallation and use of basic commands
8. ORMThe frameworkSequelizeIntroduction and Use
Actual project (Todo)
Sorting and summarizing

1 to 2`NodeJS`The installation

Download the official installation package
inmac osThrough theHomebrewThe installation
usenvmVersion Manager Installation (recommended)

1-3 first`Nodejs`The program

win.js

const win = require('os');

// Displays system CPU information
console.log(win.cpus());

// Displays the percentage of memory remaining in the system
const freemen = win.freemem()/1024/1024/1024; //byte KB MB GB
const totalmem = win.totalmem()/1024/1024/1024; //byte KB MB GB
console.log('freemen/totalmem:'.parseInt(freemen/totalmem*100));

// Displays the network status of the current system
console.log(win.networkInterfaces());

console.log(win.arch());
console.log(win.platform());
console.log(win.release());
console.log(win.type());
console.log(win.userInfo());
console.log(win.loadavg());
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server.js

// The first nodejs program

const http = require('http');
const hostname = '127.0.0.1';
const port = "50000";

// Create a server instance
const server = http.createServer((req, res) = > {
  // req: request object
  // res: response object
  res.statusCode = 200;
  res.setHeader('Content-Type'.'text/plain');
  res.end('hello node');
})

server.listen(port, hostname, () = > {
  / / callback
  console.log('Service started successfully, listening port:${port}`);
})

// Start the service node server.js
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1-4 `Nodejs` 和 `npm`introduce

From 1 to 5`Nodemon`Introduction and Use

This section describes the Nodemon features

Project integration and configuration demonstration

Project execution
```
npm install nodemon -D
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```

Modify the startup command in package.json

"scripts": {
    "dev:node": "node ./src/index.js"."dev": "nodemon ./src/index.js"."test": "echo \"Error: no test specified\" && exit 1"
  },
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- First line: Print the version of 'Nodemon' - second line: Enter 'RS' to restart the project - third line: - Modify the path of 'watch' through the 'nodemon.json' file. Under the project, create the 'nodemon.json' file > nodemon.json {"watch": [". / SRC / * * / *. * "]} ` ` ` - the fourth row: listening ` js ` ` MJS ` ` json ` fileCopy the code

1-6 `nrm` 和 `nvm`Introduction to the use of

use`nrm`management`npm` 源

Install NRM globally using NPM
```
npm install nrm -g
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```
Use the following command to view the NPM source
```
nrm ls
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```

npm ——– registry.npmjs.org/

yarn ——- registry.yarnpkg.com/

cnpm ——- r.cnpmjs.org/

taobao —– registry.npm.taobao.org/

nj ——— registry.nodejitsu.com/

npmMirror — skimdb.npmjs.com/registry/

edunpm —– registry.enpmjs.org/

Use the following command to viewnrmCommon commands of
```
nrm -h
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```

ls List all the registries current Show current registry name use <registry> Change registry to registry add <registry> < URL > [home] Add one custom Registry (use this command when using private sources)Copy the code

use`nvm`management`nodejs`version

windowsInstall the reference

Github.com/coreybutler…

Run the following command to check the node version
```
nvm ls
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```
Run the following command to view common NVM commands
```
nvm -h
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```

NVM ls Views all installed NodeJS versionsCopy the code
NVM install Version You can install a specified nodeJS version. NVM Use the version number to switch to the specified version. NVM uninstall Version number To uninstall the specified version

The second chapter`Web`Application base

2-1 `Web`Application basis and`Express`introduce

What is a Web application

Provide API services called Web applications EG: front-end (Ajax/AS/Up —-> Server (Web applications) —-> Cache/database)
The role of Express in Web applications

Build HTTP service, accept REQ to process RES, and defend against attack routing

A Web framework in Node

Build a Web application using Express

Create the Express project directory

mkdir express-myapp

cd express-myapp

Use the following commands to create the package.json file and.git folder, and create the.gitignore file

.DS_Store node_modules/ /dist/ npm-debug.log* yarn-debug.log* yarn-error.log* static/mock # Editor directories and files  .idea .vscode *.suo *.ntvs* *.njsproj *.slnCopy the code

npm init -y

git init

Use the following command to download and install Express and save it to the dependency list

npm install express -S

Create a SRC folder under your project and create an index.js file under the folder

index.js

/ / into the express
const express = require('express')
// Create expres instance
const app = express()

const port = 3000

/ / http://127.0.0.1:3000
// app.use((req, res) => {
// res.json({
// name: 'vience'
/ /})
// })

/ / http://127.0.0.1:3000/name
app.get('/name'.(req, res) = > {
  let {age} = req.params
  res.send('vience')
})

app.get('/name/:age'.(req, res) = > {
  let {age} = req.params
  res.json({
    name: 'vience',
    age
  })
})

app.post('/name'.(req, res) = > {
  let {age} = req.params
  res.send('vience_post')
})

app.listen(port, () = > {
  console.log(`Example app listening on port ${port}! `)})Copy the code

If nodemon is used to start the project, see 1-5 for installation and configuration

2-2 `Route`Introduction and Use

RouteWhat is the

Route means determining how an application responds to a client’s request for a particular endpoint (URL > network > DNS resolution > destination server > Routing).

Specific endpoints are URIs (or paths) and specific HTTP request methods

Each route can have one or more handler functions that are executed when the route is matched.

app.METHOD(PATH, HANDLER)
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appYes.expressThe instance.
METHODIs a lowercase HTTP request method (get post put delete)
PATHIs the path on the server.
HANDLERIs the function performed when matching routes.

2-3 `Express`Routing demo

Write the following code in the index.js file from the previous project

By the method type requestedget / post / put / delete

app.get('/demo'.function (req, res) {
    res.json({
        message: 'Hello Express Route from get demo'})})Copy the code

app.post('/demo'.function (req, res) {
    res.json({
        message: 'Hello Express Route from post demo'})})Copy the code

Through the URI

/ / GET http://127.0.0.1:3000/user/byname? name=vience
app.get('/user/byname'.function (req, res) {
  let { name } = req.query
  res.json({
      name
  })
})
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/ / GET http://127.0.0.1:3000/user/byid? id=10001
app.get('/user/byid'.function (req, res) {
  let { id } = req.query
  res.json({
      id
  })
})
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2-4 `Express`routing`API`use

App. All is used

Need to define an API/route that allows the client to get a response regardless of the request type (get/ POST/DELETE/PUT)

/ / GET/POST/DELETE/PUT http://127.0.0.1:3000/demo1
app.all('/demo1'.(req, res) = > {
  res.json({
    message: 'demo1'.method: req.method
  })
})
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You need to define an API/route that allows the client to get a response no matter what request URI it uses (logging)

/ / GET/POST/DELETE/PUT http://127.0.0.1:3000/ *
app.all(The '*'.(req, res) = > {
  res.json({
    message: 'demo1'.method: req.method,
    URI: req.path
  })
})
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2-5 `Express`routing`API`use

Use of app.use –> Middleware

Need to define an API/route that allows the client to get a response regardless of the request type (get/ POST/DELETE/PUT)

 / / GET/POST/DELETE/PUT http://127.0.0.1:3000/demo1
  app.use('/demo2'.(req, res) = > {
    res.json({
      message: 'demo2'.method: req.method
    })
  })
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Need to define an API/route that allows the client to get a response no matter what request URI it uses

/ / GET/POST/DELETE/PUT http://127.0.0.1:3000/ *
app.use((req, res) = > {
  res.json({
    message: 'demo1'.method: req.method,
    URI: req.path
  })
})
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Cutting and using routes

Requirements: Existing order module routing and membership module routing

First, create router folder under SRC, and create two routing modules member.js and oeder

The code in the file is as follows

member.js

const express = require('express');

const router = express.Router();

router.get('/list'.(req, res) = > {
  res.json({
    list: [{id: 001.name: 'bill'
      },
      {
        id: 002.name: 'Joe'}]})})module.exports = router;
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order.js

const express = require('express');

const router = express.Router();

router.get('/list'.(req, res) = > {
  res.json({
    list: [{id: 001.price: 200.name: 'shoes'
      },
      {
        id: 002.price: 500.name: 'baby'}]})})module.exports = router;
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Import the two routing modules (middleware) in index.js as follows

// Route cutting and usage
/ / GET http://127.0.0.1:3000/member/list
const memberRouter = require('./router/member');
app.use('/member', memberRouter)
/ / GET http://127.0.0.1:3000/order/list
const orderRouter = require('./router/order');
app.use('/order', orderRouter)
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2-6 Introduction and use of middleware

What is Express middleware
Pluggable function

Middleware architecture
1. A function
2. Err, req, res, next,
function
1. Exception handling
2. Handle the business functions, then hand over control –> Next
3. Respond to the request — end the response –> as a handler for the route
level
1. App-level usage (global)
  - When you sign up, it’s at the top
  - App.use –> API loaded in
2. router jibie
3. Exception Handling –> APP level
4. Built-in level
Built-in middleware and third-party middleware
Custom middleware

2-7 Exception Handling

Exception handling
Express built-in exception handling
Custom exception handling

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Chapter one establishes the local basic environment for front-end full stack development

1-1 Course introduction

Preparation of the development environment

`Web`Application base

Actual project (`Todo`)

Sorting and summarizing

1 to 2`NodeJS`The installation

1-3 first`Nodejs`The program

1-4 `Nodejs` 和 `npm`introduce

From 1 to 5`Nodemon`Introduction and Use

1-6 `nrm` 和 `nvm`Introduction to the use of

use`nrm`management`npm` 源

use`nvm`management`nodejs`version

The second chapter`Web`Application base

2-1 `Web`Application basis and`Express`introduce

2-2 `Route`Introduction and Use

2-3 `Express`Routing demo

2-4 `Express`routing`API`use

2-5 `Express`routing`API`use

2-6 Introduction and use of middleware

2-7 Exception Handling

React + Nodejs + Mysql full stack

Chapter one establishes the local basic environment for front-end full stack development

1-1 Course introduction

Preparation of the development environment

WebApplication base

Actual project (Todo)

Sorting and summarizing

1 to 2NodeJSThe installation

1-3 firstNodejsThe program

1-4 Nodejs 和 npmintroduce

From 1 to 5NodemonIntroduction and Use

1-6 nrm 和 nvmIntroduction to the use of

usenrmmanagementnpm 源

usenvmmanagementnodejsversion

The second chapterWebApplication base

2-1 WebApplication basis andExpressintroduce

2-2 RouteIntroduction and Use

2-3 ExpressRouting demo

2-4 ExpressroutingAPIuse

2-5 ExpressroutingAPIuse

2-6 Introduction and use of middleware

2-7 Exception Handling

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`Web`Application base

Actual project (`Todo`)

1 to 2`NodeJS`The installation

1-3 first`Nodejs`The program

1-4 `Nodejs` 和 `npm`introduce

From 1 to 5`Nodemon`Introduction and Use

1-6 `nrm` 和 `nvm`Introduction to the use of

use`nrm`management`npm` 源

use`nvm`management`nodejs`version

The second chapter`Web`Application base

2-1 `Web`Application basis and`Express`introduce

2-2 `Route`Introduction and Use

2-3 `Express`Routing demo

2-4 `Express`routing`API`use

2-5 `Express`routing`API`use