SQL事务提交和错误句柄

Question

我的代码如下：

create my sp 
as 
    declare cursor 
    open cursor

    fetch next from 
    begin try
       begin transaction tran1
         exec sp_1.... 
       commit transaction tran1

       select * from table

       begin transaction tran2
           exec sp_2.... 
       commit transaction tran2
    end

    fetch next from cursor
end try

begin catch

SELECT ERROR_MESSAGE() AS ErrorMessage;
IF @@TRANCOUNT > 0
ROLLBACK TRAN;

fetch next from cursor
end catch
close cursor
deallocate cursor

我需要这段代码：

1. 包含两个事务，并在发生错误时回滚
2. 当存储过程被杀死时，事务仍将回滚

我认为catch部分可能不对，因为有两个事务需要具体。