Using Stored Procedures in SQL Server to Create a User Login System

One essential component is user authentication. The usage of SQL Server stored procedures to implement a safe and effective login system guarantees that user credentials are checked against a database. The setup of a UsersDetails table and a LoginUser stored procedure for managing user logins are described below.

Make the UsersDetails Table in Step 1

Create a table first in order to store user credentials. Username and Password columns are shown in this example. As necessary, changes can be made to incorporate more user data.

USE DBname;
GO
-- Create the UsersDetails table if not exists
CREATE TABLE IF NOT EXISTS UsersDetails (
   UserID INT PRIMARY KEY IDENTITY(1,1),
   Username NVARCHAR(50) NOT NULL,
   Password NVARCHAR(50) NOT NULL
   -- Add additional columns as needed
);
GO

Step 2. Develop the LoginUser Stored Procedure

Next, create a stored procedure (LoginUser) that verifies user credentials against the UsersDetails table. This procedure accepts @Username and @Password parameters and outputs a @Status indicating the success or failure of the login attempt.

USE [DBname];
GO
/****** Object:  StoredProcedure [dbo].[LoginUser]    Script Date: 7/1/2024 3:29:21 PM ******/
SET ANSI_NULLS ON;
GO
SET QUOTED_IDENTIFIER ON;
GO
ALTER PROCEDURE [dbo].[LoginUser]
    @Username NVARCHAR(50),
    @Password NVARCHAR(50),
    @Status INT OUTPUT
AS
BEGIN
    SET @Status = 0; -- Default status to success
    IF EXISTS (SELECT 1 FROM UsersDetails WHERE Username = @Username AND Password = @Password)
        SELECT 'Login successful' AS [Message], @Status AS [Status];
    ELSE
    BEGIN
        SET @Status = 1; -- Set status to fail
        SELECT 'Invalid username or password' AS [Message], @Status AS [Status];
    END
END;

Step 3. Implementing the Login process

In your application, call the LoginUser stored procedure with the provided username and password. The stored procedure will return a message indicating whether the login was successful (@Status = 0) or unsuccessful (@Status = 1).

DECLARE @Username NVARCHAR(50) = 'example_user';
DECLARE @Password NVARCHAR(50) = 'example_password';
DECLARE @Status INT;
EXEC [dbo].[LoginUser]
   @Username,
   @Password,
   @Status OUTPUT;

IF @Status = 0
   PRINT 'Login successful';
ELSE
   PRINT 'Login failed: Invalid username or password';

Conclusion

Implementing user authentication using SQL Server stored procedures provides a robust way to manage login functionality within your applications. Ensure to secure passwords properly using hashing techniques and validate user inputs to enhance security further.

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