text: IF NOT EXISTS (SELECT name FROM sys.server_principals WHERE name = 'IIS APPPOOL\DefaultAppPool')
  BEGIN
      CREATE LOGIN [IIS APPPOOL\DefaultAppPool] 
        FROM WINDOWS WITH DEFAULT_DATABASE=[master], 
        DEFAULT_LANGUAGE=[us_english]
  END
  GO
  CREATE USER [ContosoUniversityUser] 
    FOR LOGIN [IIS APPPOOL\DefaultAppPool]
  GO
  EXEC sp_addrolemember 'db_owner', 'ContosoUniversityUser'
  GO