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Posted 27 Nov 2016

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SQL Server CRUD Actions Using Node JS

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1 Dec 2016CPOL6 min read
In this post, we will see how we can perform CRUD application in our SQL database using Node JS.

In this post, we will see how we can perform CRUD application in our SQL database using Node JS. As you all know, Node JS is a run time environment built on Chrome’s V8 JavaScript engine for server side and networking application. And it is an open source which supports cross platforms. Node JS applications are written in pure JavaScript. If you are new to Node JS, I strongly recommend you read my previous post about Node JS here. Now let’s begin.

Background

There was a time where we developers were dependant on any server side languages to perform server side actions. Few years ago, a company called Joyent, Inc. brought us a solution for this. That is, we can do the server side actions if we know JavaScript. Because of the wonderful idea behind this, it became a great success. You can do server side actions without knowing a single code related to any server side languages like C# and PHP. Here, we are going to see how you can do the database actions like Create, Read, Update, Delete using Node JS. I hope you will like this.

Before we start coding our Node JS application, we can set up Node JS tool available for Visual Studio.

Node JS Tool for Visual Studio

You can always run your Node JS code by using a command prompt, so setting up this tool is optional. If you install it, you can easily debug and develop Node JS. So I recommend you install it.

To download the tool, please click on this link. Once you have downloaded the set up file, you can start installing it.

node_js_tool_for_visual_studio

So I hope you have installed the application. Now, you can create a Node JS application in our Visual Studio.

Creating Node JS Application In Visual Studio

You can find an option as Node JS in your Add New Project window as follows. Please click on that and create a new project.

new_node_js_project

Now our Visual Studio is ready for coding, but as I mentioned earlier, we are going to use SQL Server as our database. So we need to do some configuration related to that too. Let’s do it now.

Configure SQL Server for Node JS Development

You need to make sure that the following services are run:

  • SQL Server
  • SQL Server Agent (Skip it if you are using SQLEXPRESS)
  • SQL Server Browser

To check the status of these services, you can always do so by running services.msc in Run command window. Once you are done, you need to enable some protocols and assign a port to it. Now go to your SQL Server Configuration Manager. Most probably, you can find the file in this C:\Windows\SysWOW64 location, if you can't find it, start window.

sql_server_manager_location

Now go to SQL Server Network Configuration and click on Protocols for SQLEXPRESS(Your SQL Server) and Enable TCP/IP.

protocols_for_sql_express

Now right click and click on Properties on TCP/IP. Go to IP Addresses and assign port for all the IPs.

assigning_tcp_ip_port_in_sql_server

If you have done it, it is time to set up your database and insert some data. Please do not forget to restart your service, as it is mandatory to get updated the changes we have done in the configurations.

restart_sql_express

Creating Database

Here, I am creating a database with name “TrialDB”, you can always create a DB by running the query given below:

SQL
USE [master]
GO

/****** Object:  Database [TrialDB]    Script Date: 20-11-2016 03:54:53 PM ******/
CREATE DATABASE [TrialDB]
 CONTAINMENT = NONE
 ON  PRIMARY 
( NAME = N'TrialDB', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL13.SQLEXPRESS\MSSQL\DATA\TrialDB.mdf' , _
SIZE = 8192KB , MAXSIZE = UNLIMITED, FILEGROWTH = 65536KB )
 LOG ON 
( NAME = N'TrialDB_log', _
FILENAME = N'C:\Program Files\Microsoft SQL Server\
MSSQL13.SQLEXPRESS\MSSQL\DATA\TrialDB_log.ldf' , _
SIZE = 8192KB , MAXSIZE = 2048GB , FILEGROWTH = 65536KB )
GO

ALTER DATABASE [TrialDB] SET COMPATIBILITY_LEVEL = 130
GO

IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC [TrialDB].[dbo].[sp_fulltext_database] @action = 'enable'
end
GO

ALTER DATABASE [TrialDB] SET ANSI_NULL_DEFAULT OFF 
GO

ALTER DATABASE [TrialDB] SET ANSI_NULLS OFF 
GO

ALTER DATABASE [TrialDB] SET ANSI_PADDING OFF 
GO

ALTER DATABASE [TrialDB] SET ANSI_WARNINGS OFF 
GO

ALTER DATABASE [TrialDB] SET ARITHABORT OFF 
GO

ALTER DATABASE [TrialDB] SET AUTO_CLOSE OFF 
GO

ALTER DATABASE [TrialDB] SET AUTO_SHRINK OFF 
GO

ALTER DATABASE [TrialDB] SET AUTO_UPDATE_STATISTICS ON 
GO

ALTER DATABASE [TrialDB] SET CURSOR_CLOSE_ON_COMMIT OFF 
GO

ALTER DATABASE [TrialDB] SET CURSOR_DEFAULT  GLOBAL 
GO

ALTER DATABASE [TrialDB] SET CONCAT_NULL_YIELDS_NULL OFF 
GO

ALTER DATABASE [TrialDB] SET NUMERIC_ROUNDABORT OFF 
GO

ALTER DATABASE [TrialDB] SET QUOTED_IDENTIFIER OFF 
GO

ALTER DATABASE [TrialDB] SET RECURSIVE_TRIGGERS OFF 
GO

ALTER DATABASE [TrialDB] SET  DISABLE_BROKER 
GO

ALTER DATABASE [TrialDB] SET AUTO_UPDATE_STATISTICS_ASYNC OFF 
GO

ALTER DATABASE [TrialDB] SET DATE_CORRELATION_OPTIMIZATION OFF 
GO

ALTER DATABASE [TrialDB] SET TRUSTWORTHY OFF 
GO

ALTER DATABASE [TrialDB] SET ALLOW_SNAPSHOT_ISOLATION OFF 
GO

ALTER DATABASE [TrialDB] SET PARAMETERIZATION SIMPLE 
GO

ALTER DATABASE [TrialDB] SET READ_COMMITTED_SNAPSHOT OFF 
GO

ALTER DATABASE [TrialDB] SET HONOR_BROKER_PRIORITY OFF 
GO

ALTER DATABASE [TrialDB] SET RECOVERY SIMPLE 
GO

ALTER DATABASE [TrialDB] SET  MULTI_USER 
GO

ALTER DATABASE [TrialDB] SET PAGE_VERIFY CHECKSUM  
GO

ALTER DATABASE [TrialDB] SET DB_CHAINING OFF 
GO

ALTER DATABASE [TrialDB] SET FILESTREAM( NON_TRANSACTED_ACCESS = OFF ) 
GO

ALTER DATABASE [TrialDB] SET TARGET_RECOVERY_TIME = 60 SECONDS 
GO

ALTER DATABASE [TrialDB] SET DELAYED_DURABILITY = DISABLED 
GO

ALTER DATABASE [TrialDB] SET QUERY_STORE = OFF
GO

USE [TrialDB]
GO

ALTER DATABASE SCOPED CONFIGURATION SET MAXDOP = 0;
GO

ALTER DATABASE SCOPED CONFIGURATION FOR SECONDARY SET MAXDOP = PRIMARY;
GO

ALTER DATABASE SCOPED CONFIGURATION _
SET LEGACY_CARDINALITY_ESTIMATION = OFF;
GO

ALTER DATABASE SCOPED CONFIGURATION FOR _
SECONDARY SET LEGACY_CARDINALITY_ESTIMATION = PRIMARY;
GO

ALTER DATABASE SCOPED CONFIGURATION SET PARAMETER_SNIFFING = ON;
GO

ALTER DATABASE SCOPED CONFIGURATION FOR _
SECONDARY SET PARAMETER_SNIFFING = PRIMARY;
GO

ALTER DATABASE SCOPED CONFIGURATION SET QUERY_OPTIMIZER_HOTFIXES = OFF;
GO

ALTER DATABASE SCOPED CONFIGURATION FOR _
SECONDARY SET QUERY_OPTIMIZER_HOTFIXES = PRIMARY;
GO

ALTER DATABASE [TrialDB] SET  READ_WRITE 
GO

Create a Table and Insert Data in Database

To create a table, you can run the query below:

SQL
USE [TrialDB]
GO

/****** Object:  Table [dbo].[Course]    Script Date: 20-11-2016 03:57:30 PM ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[Course](
	[CourseID] [int] NOT NULL,
	[CourseName] [nvarchar](50) NOT NULL,
	[CourseDescription] [nvarchar](100) NULL,
 CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED 
(
	[CourseID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, _
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

Now, we can insert a little data to our newly created table.

SQL
USE [TrialDB]
GO

INSERT INTO [dbo].[Course]
           ([CourseID]
           ,[CourseName]
           ,[CourseDescription])
     VALUES
           (1
           ,'C#'
           ,'Learn C# in 7 days')
 INSERT INTO [dbo].[Course]
           ([CourseID]
           ,[CourseName]
           ,[CourseDescription])
     VALUES
           (2
           ,'Asp.Net'
           ,'Learn Asp.Net in 7 days')
INSERT INTO [dbo].[Course]
           ([CourseID]
           ,[CourseName]
           ,[CourseDescription])
     VALUES
           (3
           ,'SQL'
           ,'Learn SQL in 7 days')
INSERT INTO [dbo].[Course]
           ([CourseID]
           ,[CourseName]
           ,[CourseDescription])
     VALUES
           (4
           ,'JavaScript'
           ,'Learn JavaScript in 7 days')
GO

So our data is ready, that means we are all set to write our Node JS application. Go to the application we created and you can see a JS file there, normally named as server.js. Here, I am going to change the name as App.js.

MSSQL – Microsoft SQL Server Client for Node.js

You can find many packages for our day to day life in Node JS, what you need to do all is, just install that package and start using it. Here, we are going to use a package called MSSQL.

Node-MSSQL
  • has unified interface for multiple TDS drivers.
  • has built-in connection pooling.
  • supports built-in JSON serialization introduced in SQL Server 2016.
  • supports Stored Procedures, Transactions, Prepared Statements, Bulk Load and TVP.
  • supports serialization of Geography and Geometry CLR types.
  • has smart JS data type to SQL data type mapper.
  • supports Promises, Streams and standard callbacks.
  • supports ES6 tagged template literals.
  • is stable and tested in production environment.
  • is well documented.

You can find more about the package here. You can easily install this package by running the following command in your Nuget Package Manager Console.

npm install mssql

mssql_node_js_install

Now we can load this package by using a function called require.

JavaScript
//MSSQL Instance Creation
var sqlInstance = require("mssql");

Then, you can set the database configurations as follows.

JavaScript
/Database configuration
var setUp = {
    server: 'localhost',
    database: 'TrialDB',
    user: 'sa',
    password: 'sa',
    port: 1433
};

Once you have a configuration set up, you can connect your database by using connect() function.

JavaScript
sqlInstance.connect(setUp)

Now, we can perform the CRUD operations. Are you ready?

Select All the Data from Database using Node JS

JavaScript
// To retrieve all the data - Start
                new sqlInstance.Request()
                    .query("select * from Course")
                    .then(function (dbData) {
                        if (dbData == null || dbData.length === 0)
                            return;
                        console.dir('All the courses');
                        console.dir(dbData);
                    })
                    .catch(function (error) {
                        console.dir(error);
                    });

                // To retrieve all the data - End

Now, run your application and see the output as follows:

node_js_select_all_data_from_database

Select Data with Where Condition from Database using Node JS

You can always select a particular record by giving an appropriate select query as follows:

JavaScript
// To retrieve specicfic data - Start
               var value = 2;
               new sqlInstance.Request()
                   .input("param", sqlInstance.Int, value)
                   .query("select * from Course where CourseID = @param")
                   .then(function (dbData) {
                       if (dbData == null || dbData.length === 0)
                           return;
                       console.dir('Course with ID = 2');
                       console.dir(dbData);
                   })
                   .catch(function (error) {
                       console.dir(error);
                   });
               // To retrieve specicfic data - End

So what would be the output of the above code? Any idea?

node_js_select_particular_data_from_database

Insert Data to Database using Node JS

We can always perform some insert query too using Node JS, the difference here will be, as we have Transactions in SQL, we will include that too here. The following code performs an insert operation.

JavaScript
// Insert data - Start
var dbConn = new sqlInstance.Connection(setUp,
    function (err) {
        var myTransaction = new sqlInstance.Transaction(dbConn);
        myTransaction.begin(function (error) {
            var rollBack = false;
            myTransaction.on('rollback',
                function (aborted) {
                    rollBack = true;
                });
            new sqlInstance.Request(myTransaction)
                .query("INSERT INTO [dbo].[Course] 
                ([CourseName],[CourseDescription]) 
                VALUES ('Node js', 
                'Learn Node JS in 7 days')",
                function (err, recordset) {
                    if (err) {
                        if (!rollBack) {
                            myTransaction.rollback(function (err) {
                                console.dir(err);
                            });
                        }
                    } else {
                        myTransaction.commit().then(function (recordset) {
                            console.dir('Data is inserted successfully!');
                        }).catch(function (err) {
                            console.dir('Error in transaction commit ' + err);
                        });
                    }
                });
        });
    });
// Insert data - End

So let’s run it and see the output.

node_js_insert_data_to_database

Delete Data from Database using Node JS

As we performed insert operation, we can do the same for delete operation as below:

JavaScript
// Delete data - Start
var delValue = 4;
var dbConn = new sqlInstance.Connection(setUp,
    function (err) {
        var myTransaction = new sqlInstance.Transaction(dbConn);
        myTransaction.begin(function (error) {
            var rollBack = false;
            myTransaction.on('rollback',
                function (aborted) {
                    rollBack = true;
                });
            new sqlInstance.Request(myTransaction)
                .query("DELETE FROM [dbo].[Course] 
                WHERE CourseID=" + delValue,
                function (err, recordset) {
                    if (err) {
                        if (!rollBack) {
                            myTransaction.rollback(function (err) {
                                console.dir(err);
                            });
                        }
                    } else {
                        myTransaction.commit().then(function (recordset) {
                            console.dir('Data is deleted successfully!');
                        }).catch(function (err) {
                            console.dir('Error in transaction commit ' + err);
                        });
                    }
                });
        });
    });
// Delete data - End

Now, run your application and see whether the data is deleted.

node_js_delete_data_from_database

Update Data from Database using Node JS

The only action pending here to perform is UPDATE. Am I right? Let’s do that too.

JavaScript
// Update data - Start
var updValue = 3;
var dbConn = new sqlInstance.Connection(setUp,
    function (err) {
        var myTransaction = new sqlInstance.Transaction(dbConn);
        myTransaction.begin(function (error) {
            var rollBack = false;
            myTransaction.on('rollback',
                function (aborted) {
                    rollBack = true;
                });
            new sqlInstance.Request(myTransaction)
                .query("UPDATE [dbo].[Course] SET [CourseName] = 'Test' _
                            WHERE CourseID=" + updValue,
                function (err, recordset) {
                    if (err) {
                        if (!rollBack) {
                            myTransaction.rollback(function (err) {
                                console.dir(err);
                            });
                        }
                    } else {
                        myTransaction.commit().then(function (recordset) {
                            console.dir('Data is updated successfully!');
                        }).catch(function (err) {
                            console.dir('Error in transaction commit ' + err);
                        });
                    }
                });
        });
    });
// Update data - End

Here goes the output:

node_js_update_data_from_database

You can always download the source code attached to see the complete code and application. Happy coding!.

See Also

Conclusion

Did I miss anything that you may think is needed? Could you find this post useful? I hope you liked this article. Please share your valuable suggestions and feedback.

Your Turn. What Do You Think?

A blog isn’t a blog without comments, but do try to stay on topic. If you have a question unrelated to this post, you’re better off posting it on C# Corner, Code Project, Stack Overflow, ASP.NET Forum instead of commenting here. Tweet or email me a link to your question there and I’ll definitely try to help if I can.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sibeesh Passion
Software Developer
Germany Germany
I am Sibeesh Venu, an engineer by profession and writer by passion. I’m neither an expert nor a guru. I have been awarded Microsoft MVP 3 times, C# Corner MVP 5 times, DZone MVB. I always love to learn new technologies, and I strongly believe that the one who stops learning is old.

My Blog: Sibeesh Passion
My Website: Sibeesh Venu

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