How to connect nodejs to mysql database

To connect to a MySQL database, you need to follow the following steps: Install the mysql2 driver. Use mysql2.createConnection() to create a connection object that contains the host address, port, username, password, and database name. Use connection.query() to perform queries. Finally use connection.end() to end the connection.

How to use Node.js to connect to MySQL database

In order to use Node.js to connect to MySQL database, you need to follow the following Steps:

1. Install the MySQL driver

Use npm to install mysql2 Driver:

npm install mysql2

2 . Create a MySQL connection

Use the mysql2.createConnection() function to create a connection object:

const mysql = require('mysql2');

const connection = mysql.createConnection({
  host: 'localhost',
  port: 3306,
  user: 'root',
  password: 'password',
  database: 'database_name'
});

Among them:

• host: The host address or IP address of the database.
• port: The port number of the database.
• user: Username to connect to the database.
• password: Password for connecting to the database.
• database: The name of the database to be connected.

3. Execute the query

Use the connection.query() method to execute the query:

connection.query('SELECT * FROM table_name', (err, results) => {
  if (err) throw err;

  console.log(results);
});

where:

• 'SELECT * FROM table_name': SQL query to be executed.
• (err, results): Callback function, executed when the query is completed.
• err: If an error occurs in the query, error information is included; otherwise, it is null.
• results: Array containing query results.

4. End the connection

After using the connection object, remember to use the connection.end() method to end the connection:

connection.end();

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