nodejs express mysql code example

Example 1: rest api node js with mysql

const express = require('express'),
  app = express(),
  bodyParser = require('body-parser');
  port = process.env.PORT || 3000;


const mysql = require('mysql');
// connection configurations
const mc = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '',
    database: 'mydb'
});
 
// connect to database
mc.connect();

app.listen(port);

console.log('API server started on: ' + port);

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var routes = require('./app/routes/approutes'); //importing route
routes(app); //register the route

Example 2: how to access a database in express

var MongoClient = require('mongodb').MongoClient

MongoClient.connect('mongodb://localhost:27017/animals', function (err, client) {
  if (err) throw err

  var db = client.db('animals')

  db.collection('mammals').find().toArray(function (err, result) {
    if (err) throw err

    console.log(result)
  })
})

Example 3: how to access a database in express

var mysql = require('mysql')
var connection = mysql.createConnection({
  host: 'localhost',
  user: 'dbuser',
  password: 's3kreee7',
  database: 'my_db'
})

connection.connect()

connection.query('SELECT 1 + 1 AS solution', function (err, rows, fields) {
  if (err) throw err

  console.log('The solution is: ', rows[0].solution)
})

connection.end()