Node.js MySQL Select Record

In Node.js, you can use the mysql package to interact with a MySQL database and perform CRUD (Create, Read, Update, Delete) operations. In this tutorial, we'll discuss how to select records from a MySQL database using Node.js and the mysql package.

Syntax

The basic syntax for selecting records from a MySQL database using Node.js and the mysql package is as follows:

const mysql = require('mysql');

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

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

  console.log(rows);
});

connection.end();

Example

Let's say we have a MySQL database with a table called "employees". We want to retrieve all the records from this table using Node.js and the mysql package. Here's how we can do it:

const mysql = require('mysql');

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

connection.query('SELECT * FROM employees', (err, rows, fields) => {
  if (err) throw err;

  console.log(rows);
});

connection.end();

Output

When we run the above code, it will retrieve all the records from the employees table in the mydb database and print them to the console in JSON format.

Explanation

In the example above, we first created a connection to the MySQL database using the mysql package and the createConnection method. We passed in the host, user, password, and database name as options.

We then used the connection.query method to execute a SELECT statement and retrieve all the records from the employees table. The query method takes a callback function as a second argument, which will be called with the result of the query. In this case, we simply logged the rows to the console.

Finally, we closed the connection to the database using the connection.end method.

Use

Node.js makes it easy to select records from a MySQL database using the mysql package. You can use this feature to retrieve any data you need from your database and use it in your Node.js applications.

Important Points

• Remember to always sanitize user input to prevent SQL injection attacks.
• Use prepared statements to make your code more secure and maintainable.
• Node.js and the mysql package can handle large datasets with ease.

Summary

In this tutorial, we discussed how to select records from a MySQL database using Node.js and the mysql package. We covered the syntax, example, output, explanation, use, and important points of selecting records from a MySQL database in Node.js. With this knowledge, you can now retrieve data from any MySQL database using Node.js and the mysql package.