The server principal "(username)" is not able to access the database "(databasename)" under the current security context

I'm trying to access a database in SQL Server 2012

Microsoft SQL Server 2012 - 11.0.5343.0 (X64)
      May  4 2015 19:11:32
      Copyright (c) Microsoft Corporation
      Standard Edition (64-bit) on Windows NT 6.3 <X64> (Build 14393: )

but I'm getting the error:
08004:[Microsoft][ODBC SQL Server Driver][SQL Server]The server principal "(username)" is not able to access the database "(databasename)" under the current security context.

I had fixed this in the past with going to SSMS > Security > Logins > (user) > User Mapping and mapping the user to the database, but when I do so I get this message:
Create failed for User (username)
User, group or role (username) already exists in the current database.

What should I do to get access?
purplesoupAsked:
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Vitor MontalvãoConnect With a Mentor MSSQL Senior EngineerCommented:
In the other hand this can be an orphaned user issue. Did you restore the database lately?
If so then check for orphaned users. The following command returns the orphan users from a database:
USE databasename
GO
sp_change_users_login 'report'

Open in new window

Then with the reported orphan users you'll need to run the following command for each of those users:
sp_change_users_login 'update_one', '<LoginName>', '<DBUserName>'

Open in new window

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Vitor MontalvãoMSSQL Senior EngineerCommented:
I'm trying to access a database in SQL Server 2012
With SSMS or any other tool?
1
 
purplesoupAuthor Commented:
Thanks Vitor that did it - I am trying to create a copy of a database for testing, I have moved some code out of a desktop application and onto the web and want to run the same process on each database, so I backed up the database and restored it to a new database, but it doesn't seem to restore the users of the first database with the same permissions in the second.

Basically I want two identical databases and run the same process on each - one from the web, the other from the desktop, and check the database results are the same.

Thanks for your help. In fact perhaps I will post a second question about this.
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