sql try/catch rollback/commit - preventing erroneous commit after rollback

Question

I am trying to write an MS sql script that has a transaction and a try/catch block. If it catches an exception, the transaction is rolled back. If not, the transaction is

Answer 1

Transaction counter

--@@TRANCOUNT = 0
begin try
--@@TRANCOUNT = 0
BEGIN TRANSACTION tran1
 --@@TRANCOUNT = 1

        --your code
        -- if failed  @@TRANCOUNT = 1
        -- if success @@TRANCOUNT = 0

COMMIT TRANSACTION tran1

end try

begin catch
    print 'FAILED'
end catch