Node.js Create Connection

In Node.js, you can use the "mysql" module to create a connection between your server and a MySQL database. In this tutorial, we'll discuss how to create a connection to a MySQL database in Node.js.

Syntax

Here's the basic syntax to create a connection to a MySQL database in Node.js using the "mysql" module:

const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'database_name'
});

connection.connect((err) => {
  if (err) throw err;
  console.log('Connected!');
});

Example

Let's say we have a MySQL database with a table called "customers". Here's how we can use Node.js to create a connection to the database and retrieve all the customer records:

const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'mydb'
});

connection.connect((err) => {
  if (err) throw err;
  console.log('Connected!');
  connection.query('SELECT * FROM customers', (err, result, fields) => {
    if (err) throw err;
    console.log(result);
  });
});

Output

When we run the example code above, the output will be an array of all the customer records in the "customers" table.

Explanation

In the example above, we used Node.js to create a connection to a MySQL database with the "mysql" module. We provided the necessary credentials to connect to the database, including the hostname, username, password, and database name.

We then used the connection object to execute a SQL query to retrieve all customer records from the "customers" table. When the query finishes executing, the results are returned to the callback function, which logs the results to the console.

Use

You can use Node.js to connect to a MySQL database to perform various operations, including inserting, updating, and deleting records from the database. You can use the connection object to execute SQL queries and retrieve results.

Important Points

• Always make sure to provide the correct credentials to connect to your MySQL database.
• Always make sure to sanitize your inputs to prevent SQL injection attacks.
• Node.js MySQL module provides support for both a callback based and a promise based APIs.

Summary

In this tutorial, we discussed how to create a connection to a MySQL database in Node.js using the "mysql" module. We covered the syntax, example, output, explanation, use, and important points of creating a connection to a MySQL database in Node.js. With this knowledge, you can use Node.js to perform various operations on a MySQL database.