SQL map a login to an existing user

Question

I have recently upgraded my development environment from SQL 2000 to SQL 2008 R2. I\'ve done a backup of our production db and restored it our new dev server.

I have cr

Answer 1

Under SQL Server 2012, the user 'dbo' cannot be altered.

Answer 2

I think Nikola Markovinović's comment to this post needs to be added as an answer. Use the Alter user command:

USE {database}; 
ALTER USER {user} WITH login = {login}

Where:

• {database}: The database containing the orphan user
• {user}: The orphan user name
• {login}: The login name. You can use the same login as used on the old server or map the user to a different login name

I found this answer at http://www.aip.im/2010/05/re-map-database-user-to-login-in-sql-server-after-restoring-or-attaching-database/#sthash.fbazv94Z.dpuf

Answer 3

To reconcile the the user with the login, you can used the system stored procedure sp_change_users_login.

sp_change_users_login [ @Action = ] 'action'
[ , [ @UserNamePattern = ] 'user' ] 
[ , [ @LoginName = ] 'login' ] 
[ , [ @Password = ] 'password' ];

For example:

EXEC sp_change_users_login 'Update_One','User123','User123'

If you have a lot of users who are out of sync, you can use a cursor to pull out all of the users and run this command for them. There isn't any adverse effect to running this against users that aren't out of sync, and it will fix all of the orphaned users.

DECLARE @sql NVARCHAR(MAX);
DECLARE curSQL CURSOR
FOR
       SELECT   'EXEC sp_change_users_login ''UPDATE_ONE'', ''' + name + ''', ''' + name + ''''
       FROM     sysusers
       WHERE    issqluser = 1
                AND name NOT IN ( 'guest', 'dbo', 'sys', 'INFORMATION_SCHEMA' )
OPEN curSQL
FETCH curSQL INTO @sql
WHILE @@FETCH_STATUS = 0 
     BEGIN
           EXEC (
           @sql
           )
           FETCH curSQL INTO @sql
     END
CLOSE curSQL
DEALLOCATE curSQL

This has to be run of the context of the database you need the users fixed in.