Exit and rollback everything in script on error

Question

I have a TSQL script that does a lot of database structure adjustments but it\'s not really safe to just let it go through when something fails.

to make things clear:

Answer 1

SET XACT_ABORT ON
BEGIN TRAN

-- Batch 1

GO

if @@TRANCOUNT = 0 
SET NOEXEC ON;
GO

-- Batch 2

GO

if @@TRANCOUNT = 0 
SET NOEXEC ON;
GO

-- Batch 3

GO

if @@TRANCOUNT > 0 
COMMIT
GO