Why SQL integration matters in Express - See It in Action

Why SQL Integration Matters in Express

📖 Scenario: You are building a simple Express server that needs to store and retrieve user information. To do this, you will connect your Express app to a SQL database. This project will show you how SQL integration helps your app manage data efficiently.

🎯 Goal: Build a basic Express server that connects to a SQL database, stores user data, and retrieves it on request.

📋 What You'll Learn

Create an Express app with a route to add users

Set up a SQL database connection using a configuration variable

Write a SQL query to insert user data into the database

Write a SQL query to retrieve all users from the database

💡 Why This Matters

🌍 Real World

Most web apps need to store and retrieve data. Integrating SQL with Express lets you manage user data safely and efficiently.

💼 Career

Understanding SQL integration is essential for backend developers working with Express to build real-world applications that handle data.

1

Set up Express app and initial data

Create an Express app by importing express and calling express(). Then create a variable called users as an empty array to hold user data temporarily.

Express

const express = require('express');
const app = express();

// Your code here

Need a hint?

Use const app = express() to create the app and const users = [] to hold user data.

2

Add SQL database configuration

Add a variable called dbConfig that holds an object with these exact properties: host set to 'localhost', user set to 'root', password set to 'password', and database set to 'usersdb'.

Express

const express = require('express');
const app = express();

const users = [];

// Your code here

Need a hint?

Create dbConfig as an object with the exact keys and values for your database connection.

3

Write SQL query to insert user data

Write a function called addUser that takes name and email parameters. Inside, create a SQL query string called insertQuery that inserts these values into a table called users with columns name and email. Use template literals to insert the parameters.

Express

const express = require('express');
const app = express();

const users = [];

const dbConfig = {
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'usersdb'
};

// Your code here

Need a hint?

Use a template literal to create the SQL insert query inside the addUser function.

4

Add SQL query to retrieve all users

Write a function called getAllUsers that creates a SQL query string called selectQuery to select all columns from the users table.

Express

const express = require('express');
const app = express();

const users = [];

const dbConfig = {
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'usersdb'
};

function addUser(name, email) {
  const insertQuery = `INSERT INTO users (name, email) VALUES ('${name}', '${email}')`;
}

// Your code here

Need a hint?

Create the getAllUsers function and write the SQL select query inside it.