The SessionID can be used to handle security from the database, even though there is several ways to implement securiry, this is a simple and safe way to do it.
Create a table with the name ActiveSessions and the column SessionID as the primary key, and UserID as a nullable field. If the UserID has a value, it indicates that the user is logged in. You may also add more values, like CreatedWhen, LoggedinWhen etc.
Check the username and password, and update the Session table with the UserID.
Update the Session table, and set the UserID to null. You can also delete the row.
In the top of the main stored procedure, you can add these two lines:
DECLARE @UserID as Int
SELECT @UserID=UserID FROM ActiveSessions WHERE SessionID=@SessionID
If @UserID is not null, the User is logged in.
Last updated: 15 oct 2015
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