T-SQL kunne ikke rulle tilbage

Jeg tror, du ikke kan gøre noget ved Sql Server-behandling med DDL-fejlhåndtering, noget af det håndteres automatisk (f.eks. tvangsrulning af transaktion) af SQL Server selv.

Det, du bare kan gøre, er at få din scriptkode til at klare den og give scriptbrugere en beskrivende fejl.

Et eksempel:

--  drop table thetransformersmorethanmeetstheeye
--  select * from thetransformersmorethanmeetstheeye



--  first batch begins here         

    begin tran

    create table thetransformersmorethanmeetstheeye(i int); -- non-erring if not yet existing

    -- even there's an error here, @@ERROR will be 0 on next batch
    ALTER TABLE [dbo].[Table1]  WITH CHECK ADD  CONSTRAINT [FK_constraint] FOREIGN KEY([field1], [field2])
    REFERENCES [dbo].[Table2] ([field3], [field4]);             

go  -- first batch ends here



--  second batch begins here

    if @@TRANCOUNT > 0 begin        
        PRINT 'I have a control here if things needed be committed or rolled back';

        -- @@ERROR is always zero here, even there's an error before the GO batch. 
        -- @@ERROR cannot span two batches, it's always gets reset to zero on next batch
        PRINT @@ERROR; 


        -- But you can choose whether to COMMIT or ROLLBACK non-erring things here
        -- COMMIT TRAN;
        -- ROLLBACK TRAN;

    end
    else if @@TRANCOUNT = 0 begin
        PRINT 'Sql Server automatically rollback the transaction. Nothing can do about it';
    end
    else begin
        PRINT 'Anomaly occured, @@TRANCOUNT cannot be -1, report this to Microsoft!';
    end

--  second batch implicitly ends here