SQL Trigger for Network Login

Hi everyone,

I've hit a roadblock with some SQL code and need some help from some SQL guru's.  I have a trigger on my tps_user table that will set the network login based on the domain that is imported for a user via AD.  I've give it below:

USE [Database_Name]

GO

/****** Object:  Trigger [dbo].[addnetworklogin]    Script Date: 06/17/2013 16:20:33 ******/

SETANSI_NULLSON

GO

SETQUOTED_IDENTIFIERON

GO

-- =============================================

-- Author:        <Author,,Name>

-- Create date: <Create Date,,>

-- Description: <Description,,>

-- =============================================

ALTERTRIGGER [dbo].[addnetworklogin]

   ON [dbo].[tps_user]

   AFTERINSERT

AS

begin

      declare @Name asvarchar(255)

    declare @Domain asvarchar(255)

      declare @guid uniqueidentifier

      declare @networkLogin asvarchar(255)

      declare @count int

      declare UserCursor cursorfor

SELECT tps_guid, tps_name, usr_domain

FROM tps_user

      open UserCursor

      fetchnextfrom UserCursor into @guid, @Name, @Domain

      while (@@FETCH_STATUS= 0)

      begin

set @networkLogin = @Domain +'\'+ @Name

set @count =''

select @count =count(*)from tps_user_network_login

where tps_network_login = @networkLogin

groupby tps_network_login

print'User: '+@networkLogin+', count: '+convert(varchar(10),@count)

      if @count =''

begin

-- uncomment the following line if you want to limit all users to 1 network login.

-- delete from tps_user_network_login where tps_user_guid = @guid

insertinto tps_user_network_login (tps_guid,tps_user_guid,tps_network_login)

values (newid(),@guid,@networkLogin)

end

elseupdate tps_user_network_login set tps_user_guid = @guid where tps_network_login = @networkLogin

fetchnextfrom UserCursor into @guid, @Name, @Domain

      end

      close UserCursor

      deallocate UserCursor

end

The code works great with one exception... if I am allowing the system to add accounts automatically if it doesn't recognize the email I get an error that it cannot allow NULLs.  I need to update this code to allow a static value to be added as the prefix for @domain for these cases.  I know it has to be pretty simple but I just don't know where to put it.

So what I need is:

if domain is NULL then network login should be "static_Domain\name"

else the rest of the stuff that works. 

Thanks!