JAVASCRIPT

sequelize init connection set up nodejs node

const Sequelize = require('sequelize');

const path = 'mysql://user12:12user@localhost:3306/testdb';
const sequelize = new Sequelize(path, { operatorsAliases: false });

sequelize.authenticate().then(() => {
  console.log('Connection established successfully.');
}).catch(err => {
  console.error('Unable to connect to the database:', err);
}).finally(() => {
  sequelize.close();
});

How to create sequelize connection in javascript

// Include Sequelize module
const Sequelize = require('sequelize')
  
// Creating new Object of Sequelize
const sequelize = new Sequelize(
    'DATABASE_NAME',
    'DATABASE_USER_NAME',
    'DATABASE_PASSWORD', {
  
        // Explicitly specifying 
        // mysql database
        dialect: 'mysql',
  
        // By default host is 'localhost'           
        host: 'localhost'
    }
);
  
// Exporting the sequelize object. 
// We can use it in another file
// for creating models
module.exports = sequelize

Sequelize using javascript

// Include Sequelize module.
const Sequelize = require('sequelize')
  
// Import sequelize object, 
// Database connection pool managed by Sequelize.
const sequelize = require('../utils/database')
  
// Define method takes two arguments
// 1st - name of table
// 2nd - columns inside the table
const User = sequelize.define('user', {
  
    // Column-1, user_id is an object with 
    // properties like type, keys, 
    // validation of column.
    user_id:{
  
        // Sequelize module has INTEGER Data_Type.
        type:Sequelize.INTEGER,
  
        // To increment user_id automatically.
        autoIncrement:true,
  
        // user_id can not be null.
        allowNull:false,
  
        // For uniquely identify user.
        primaryKey:true
    },
  
    // Column-2, name
    name: { type: Sequelize.STRING, allowNull:false },
  
    // Column-3, email
    email: { type: Sequelize.STRING, allowNull:false },
  
    // Column-4, default values for
    // dates => current time
    myDate: { type: Sequelize.DATE, 
            defaultValue: Sequelize.NOW },
  
     // Timestamps
     createdAt: Sequelize.DATE,
     updatedAt: Sequelize.DATE,
})
  
// Exporting User, using this constant
// we can perform CRUD operations on
// 'user' table.
module.exports = User

sequelize mysql node js tutorial

const express = require("express");
const bodyParser = require("body-parser");
const cors = require("cors");

const app = express();

var corsOptions = {
  origin: "http://localhost:8081"
};

app.use(cors(corsOptions));

// parse requests of content-type - application/json
app.use(bodyParser.json());

// parse requests of content-type - application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true }));

// simple route
app.get("/", (req, res) => {
  res.json({ message: "Welcome to esparkinfo application." });
});

// set port, listen for requests
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}.`);
});

sequelize with mysql nodejs

const express = require(“express”);
const bodyParser = require(“body-parser”);
const cors = require(“cors”);

const app = express();

Var corsOptons = {
	origin: “http://localhost:8080/”
		};
app.use (cors(corsOptions));

// parse requests of content-type - application/json

app.use (bodyParser.json());
// parse requests of content-type - application/x-www-form-urlencoded

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

//simple route
app.get (“/”, (req, res) => {
res.json({message: “Welcome to Turing.com”});
});

// set port, listen for requests
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
console.log (‘Server is running on port $(PORT).’ );
});