How to Build Secure Node.js with SQL Server

node js with sql server database

What is Node.js?

Node.js is an open-source, run environment, that is used to runs on various platforms like (Windows, Linux, Unix, Mac OS, etc.) Node.js is based on a non-blocking, event-driven i/o model that model makes node.js is a lightweight and efficient process. Node.js is ideal for data-intensive real-time applications that run over distributed devices.

  • Node js support a runtime environment for building a server-side Java-Script application. It is used to build various kinds of applications such as web application, command-line application, real-time chat application, etc. 
  • It is also widely used to design network-based programs such as web servers, similar to PHP, ASP.NET, and Java etc.

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Node.js is used to perform some database related operations. One of the most well-known and popular databases is MySQL.

What Can Node.js Do With Database?

  • Node.js is used to perform some database related operations on the server such as create, open, read, write, delete, and close files on the server.
  • Node.js also used to perform some further operations such as: add, delete, and modify data in your database.

In this article, you will find the node js with SQL server connection, how to connect SQL database server with Node.js with many more.

Set Up Your Node.js Development Environment:

Before you are going to start node js with SQL server database connection you will need some couple of prerequisite things:

  • Install node.js version 8.0 or higher.
  • Access to SQL Server version 2012 or higher.

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Install SQL Server on Mac or Linux

First, you need to install Docker.

Run the following command in a terminal, this command is used to download the latest version of SQL Server 2017 for Linux. After the SQL installation, this will create a new container named sqlserver.

docker pull microsoft/mssql-server-linux:2017-latest

docker run -d --name sqlserver -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=P@55w0rd' -e 'MSSQL_PID=Developer' -p 1433:1433 microsoft/mssql-server-linux:2017-latest

Set Up the SQL Database:

Node.js with sql server tutorial you need a database. If you are going to run SQL server and you don’t have a database, at that time you can create your own database with the help of below code.

USE master;
GO
CREATE DATABASE calendar;
GO

Next, you need to create a new table titled events. This table will be used to store calendar events.

— Dropping events table…

DROP TABLE IF EXISTS events;

— Create events table…

CREATE TABLE events (

   id int IDENTITY(1, 1) PRIMARY KEY CLUSTERED NOT NULL

   , userId nvarchar(50) NOT NULL

   , title nvarchar(200) NOT NULL

   , description nvarchar(1000) NULL

   , startDate date NOT NULL

   , startTime time(0) NULL

   , endDate date NULL

   , endTime time(0) NULL

   , INDEX idx_events_userId ( userId )

);

 Node js with SQL Server Connection

When you are going to make connection between node js with sql server, you must need to install the node-mysql package on your account. 

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To install node-mysql packages need to follow steps:

Step 1:

For this first, you need to login to your account using SSH.

Step 2:

To download mysql packages you need to type and run the following commands:

cd ~
npm install mysql

Create Connection:

To create a connection between node.js to the MySQL database, you need to use the username and password from node js with sql server

Sample Code:

After the successful installation of the node-mysql package, now you can work with actual databases.

The following node js with sql server example code shows how to do this.

In your sample code, you need to change the following username and passwords.

dbname - change with your database name, 
username - Change with the MySQL database username, and
password - Change with the database user's password. 

Node js SQL Query:

To read or write from a MySQL database there are uses of SQL statements is. That statement is also called as “query” in mysql database. In this given sample code example you need to modify the “SELECT” database query that is used to match a table in your given database:

var mysql = require(‘mysql’);

var connection = mysql.createConnection({

   host : ‘localhost’,

   database : ‘dbname‘,

   user : ‘username‘,

   password : ‘password‘,

});

connection.connect(function(err) {

   if (err) {

     console.error(‘Error connecting: ‘ + err.stack);

     return;

   }

   console.log(‘Connected as id ‘ + connection.threadId);

});

connection.query(‘SELECT * FROM employee’, function (error, results, fields) {

   if (error)

     throw error;

   results.forEach(result => {

     console.log(result);

   });

});

connection.end();

This node js with sql server sample code example creates a MySQL connection object that is used to connect node.js to the MySQL database. The sql query method gives sql statements as a parameter and delivers the results.

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