Local SQLite Database with Node for beginners

Node and SQLLite
SQLite Database with Node
https://www.udemy.com/node-
database/?couponCode=SLIDESHARE

INSTRUCTOR:
LAURENCE SVEKIS
Course instructor : Laurence Svekis
- Over 300 courses in technology and
web applications.
- 20 years of JavaScript web
programming experience
- 500,000+ students across multiple
platforms
- Digital instructor since 2002
READY TO HELP YOU LEARN and
ANSWER ANY questions you may
have.

Windows Terminal
Windows - https://cmder.net/ or use the
command prompt terminal
Launch the Command Prompt - use the Run
window or press the Win + R keys on your
keyboard. Then, type cmd and press Enter.
List current directory of files - dir
Change directory to D drive - cd D:
Change directory down one level - cd..
Change directory to folder by name - cd folder
Make new folder - mkdir folderName
Get help - help

Mac Terminal
Open Terminal by pressing Command+Space or
select terminal in the applications list.
List current directory of files - ls
Change directory to D drive - cd D:
Change directory down one level - cd..
Change directory to folder by name - cd folder
Make new folder - mkdir folderName
Get help - help

Command Line Launch
One node is installed check to see version
installed. Type node -v
Open your editor and create a js file that
contains console.log('Hello World'); save
it as test.js
In the terminal type node test.js and watch
for a result. What gets returned?
NPM - check if its installed npm -v latest
version install npm install npm@latest -g

Create app js file
Create a main app js file to run your node application.
touch app.js

Install setup Node and Express
https://nodejs.org/en/download/
Select the platform and install
Setup of Localhost machine
https://expressjs.com/
In the terminal
node -v
npm install express --save

Npm package.json
Install all the dependencies for your project. Create
a package.json file.
You can also install packages using
Optional flags
--save - installs and adds to the package.json
--save-dev - installs and adds to the package.json
under devDependencies.
Updating packages - check all packages or specific
package.
npm install <package-name>
npm update
npm update <package-name>

Npm install Packages
Default its installed under the current tree. Npm init
to create package.json
Also adds the dependencies to the package.json
file in current folder.
Global installations of the package can be done by
adding the flag -g. Will install package to global
location.
Get global root folder.
npm init
npm install -g <package-name>
npm root -g

Npm uninstall Packages
Default its installed under the current tree.
Also adds the dependencies to the package.json
file in current folder.
Global installations of the package can be done by
adding the flag -g. Will install package to global
location.
Get global root folder.
npm uninstall <package-name>
npm install -g <package-name>
npm root -g

Setup - Local Server
Run app.js and Open Browser to localhost:8080 -
port with http path.
Assign variable to app object.
Open http://localhost:8080/ in your browser.
const express = require('express')
const app = express()
app.get('/', function (req, res) {
res.send('ready')
})
app.listen(8080, function () {
console.log('Server ready')
})
const express = require('express')
const app = express()
res.send('ready')
})
const server = app.listen(8080, function () {
})
node app.js

NodeMon
Nodemon is a utility that will monitor for any
changes in your source and automatically restart
your server. Perfect for development.
npm install -g nodemon
https://nodemon.io/
Run it
nodemon app.js
** make some changes no more node restart
typing ;)

Setup - Local Express Server
Run app.js and Open Browser to localhost:8080 -
port with http path.
Assign variable to app object.
Open http://localhost:8080/ in your browser.
const express = require('express');
const app = express();
const port = 8080;
const server = app.listen(port, function () {
})
res.json({
"status": "ready"
})
})
app.use(function (req, res) {
res.status(404);
});
nodemon app.js

Install SQLlite and MD5 for hash of passwords
https://www.npmjs.com/package/sqlite3
SQLite is a relational database management
system contained in a C library. In contrast to
many other database management systems,
SQLite is not a client–server database engine.
Rather, it is embedded into the end program.
https://www.sqlite.org/about.html
npm install sqlite3
a JavaScript function for hashing messages with
MD5.
https://www.npmjs.com/package/md5
npm install md5

Setup - Database and create Table
Create a new js file to setup a database.
const sqlite3 = require('sqlite3').verbose();
let db = new sqlite3.Database('./db/user.db');
db.run('CREATE TABLE users(id INTEGER PRIMARY KEY
AUTOINCREMENT,first,last,email,password)');
db.close();
touch dbsetup.js
mkdir db
node dbsetup.js
touch insert.js
touch insert.js
Create a new js file to insert to the database.
Add to database new users table.
Catch the errors
let sql = 'INSERT INTO users (first,last,email,password) VALUES
("Laurence", "Svekis", "gappscourses@gmail.com", "password")';
db.run(sql, [], function(err) {
if (err) {
return console.log(err.message);
}
console.log(`Rowid ${this.lastID}`);
});
db.close();

Database as module
Setup the db.js file as the database connection,
useful if you need to change file locations.
Use a module
const db = new sqlite3.Database('./db/user.db');
module.exports = db;
**** On app.js add
const db = require("./db.js")
touch db.js

Query Database for users
Querying all rows with all() method -
Will output all the contents of the database.
const md5 = require('md5');
module.exports = db;
**** On app.js add
const query = "select * from users";
db.all(query, function (err, rows) {
if (err) {
throw err;
}
rows.forEach(function (row) {
console.log(row);
});
});

List users in web page
Using express setup a new route for users const express = require('express');
const port = 8080;
})
app.get('/users', function (req, res) {
db.all(query, function (err, rows) {
if (err) {
throw err;
}
res.json({
"data": rows
});
});
})
res.json({
"status": "ready"
})
})
res.status(404);
});

List get users by id
In the browser go to the users folder and add an
id value at the end.
app.get("/users/:id", function (req, res) {
const query = "select * from users where id = ?"
const params = [req.params.id]
db.get(query, params, function (err, row) {
if (err) {
throw err;
}
res.json({
"data": row
})
});
});

Create new User
Create the browser side add.html file with a form
for inputs and event listener to send request.
For node setup install of body-parser
https://github.com/expressjs/body-parser body
parsing middleware
<form>
<input type='text' name='first' value='Laurence'>
<input type='text' name='last' value='Svekis'>
<input type='text' name='email' value='example@example.com'>
<input type='text' name='password' value='secret'>
<input type='submit'> </form>
<script>
const myForm = document.querySelector('form');
const inputs = document.querySelectorAll('input');
myForm.addEventListener("submit", function (evt) {
evt.preventDefault();
fetch('/adder', {
method: 'POST'
, body: JSON.stringify({
first: inputs[0].value
, last: inputs[1].value
, email: inputs[2].value
, password: inputs[3].value
, })
, headers: {
"Content-Type": "application/json"
}
}).then(function (response) {
return response.json()
}).then(function (body) {
console.log(body);
});
});
</script>
npm install body-parser

Node get new user data
Submit the form and check for request data from
the body in the console.
const port = 8080;
})
const bodyParser = require("body-parser");
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended:true }));
app.post('/adder', function (req, res) {
console.log(req.body);
console.log('req.body.first', req.body['first']);
})

Add new user to database
Update post to insert into database.
You can go to users to list all
http://localhost:8080/users
const port = 8080;
})
app.use(bodyParser.urlencoded({ extended:true }));
let insert = 'INSERT INTO users(first,last,email,password) VALUES (?,?,?,?)'
db.run(insert, [req.body['first'], req.body['last'], req.body['email'], req.body['password']],
function (err, row) {
if (err) {
throw err;
}
res.json({
"data": this.lastID
})
});
})
res.status(404);
});

Full Source Code app.js
res.json({"status": "ready"})
})
app.get('/new', function (req, res) {
res.sendFile(__dirname + '/add.html');
})
let insert = 'INSERT INTO users(first,last,email,password) VALUES (?,?,?,?)'
db.run(insert, [req.body['first'], req.body['last'], req.body['email'], req.body['password']],
function (err, row) {
if (err) {throw err;}
res.json({"data": this.lastID })
});
})
res.status(404);
});
const port = 8080;
const server = app.listen(port, function () {console.log('Server ready')})
app.use(bodyParser.urlencoded({
extended: true
}));
app.get('/users', function (req, res) {
const params = [];
db.all(query, params, function (err, rows) {
res.json({"data": rows});
});
})
app.get("/users/:id", function (req, res) {
const query = "select * from users where id = ?"
const params = [req.params.id]
db.get(query, params, function (err, row) {
res.json({ "data": row })
});
});

Full Source Code other files

<form><input type='text' name='first' value='Laurence'><input type='text' name='last'
value='Svekis'><input type='text' name='email' value='example@example.com'><input
type='text' name='password' value='secret'><input type='submit'> </form>
<script>
const myForm = document.querySelector('form');
const inputs = document.querySelectorAll('input');
myForm.addEventListener("submit", function (evt) {
evt.preventDefault();
fetch('/adder', {
method: 'POST'
, body: JSON.stringify({first: inputs[0].value, last: inputs[1].value, email:
inputs[2].value, password: inputs[3].value })
, headers: {"Content-Type": "application/json" }
}).then(function (response) {
return response.json()
}).then(function (body) {
console.log(body);
});
});
</script>
//db.js
const sqlite3 = require('sqlite3').verbose()
const md5 = require('md5')
module.exports = db
//dbsetup.js
db.run('CREATE TABLE users(id INTEGER PRIMARY KEY
AUTOINCREMENT,first,last,email,password)');
db.close();
let sql = 'INSERT INTO users (first,last,email,password) VALUES ("Laurence", "Svekis",
"gappscourses@gmail.com", "password")';
db.run(sql, [], function(err) {
if (err) {
return console.log(err.message);
}
console.log(`Rowid ${this.lastID}`);
});
db.close();

Congratulations on completing the section
Course instructor : Laurence Svekis -
providing online training to over
500,000 students across hundreds of
courses and many platforms.
Find out more about my courses at
http://www.discoveryvip.com/

Local SQLite Database with Node for beginners

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