Drop And Add A Sql Server Login Account To Each User Database

I would like to write code to delete and add a SQL Login to every User database on my development server.
Whenever I restore databases to dev using production backups the SQl Server logins are invalid and I need to delete them from the user database and add them again.

I've already hard-coded a sql server job with n steps... a step for each user database to drop and add this sql user to each database. This isn't optimal since I have to add or delete a step everytime a user database is added or deleted.

Does anyone know how to write a loop or cursor that does this dynamically?
I am doing something syntactically wrong related to the GO statement.




declare @db varchar(100)

declare @message varchar(3000)

DECLARE user_cursor CURSOR FOR

SELECT top 1 name

FROM master.sys.databases

where name not in

('master','tempdb','model','msdb')

OPEN user_cursor

FETCH NEXT FROM user_cursor INTO @db



WHILE @@FETCH_STATUS = 0

BEGIN

SELECT @message = 'use '+@db + '

GO'

+'DROP USER [SQLLogin.DataEntry]

CREATE USER [SQLLogin.DataEntry] FOR LOGIN [SQLLogin.DataEntry]

EXEC sp_addrolemember N''db_datareader'', N''SQLLogin.DataEntry''

GO

'

execute @message

print @message

FETCH NEXT FROM user_cursor INTO @db

END

CLOSE user_cursor

DEALLOCATE user_cursor