SQL Server 2005 Novo intoduced način poništavanja transakcija u sustavu SQL Server 2005
SET XACT_ABORT ON
kada XACT_ABORT na. U T-SQL izjave automatski unatrag vratiti transakciju kad se dogodila pogreška u izjavama.
SET XACT_ABORT ON
USE EMP
Begin Tran
Uložite u EmpInfo vrijednosti(1)
Uložite u EmpInfo vrijednosti(1) — Ova izjava će podići primarni ključ pogreške
Uložite u EmpInfo vrijednosti(2)
Prepusti transparen
Prva linija IZJAVA će izvršiti bez ikakvih pogrešaka. Primarni ključ pogreške će podići u drugom redu. No, cijela blok transakcija neće biti predan, jer je XACT_ABORT u na.
You should note that XACT_ABORT terminates the current *batch*, not the entire command. Batches are separated with the GO keyword. Execution will continue at the beginning of the next batch.
This feature is also in SQL Server 2000, though it behaves slightly differently for various errors.
In SQL 2000, there are cases where XACT_ABORT fails to rollback the transaction automatically.
For instance:
Inserting into an invalid column name.
Inserting into a primary key with IDENTITY_INSERT OFF.
Executing a SELECT that uses a non-existent UDF.
These types of errors are usually due to a poorly authored command, so they don’t occur in the day-to-day operation of your program unless someone alters the schema. But I account for their possibility when authoring database update scripts when deploying a new version of a project, just in case deployment doesn’t go as planned.
There are ways to handle these errors. Your COMMIT should be in the batch performing the DML statements. After the batch (after the GO keyword) you can check the @@TRANCOUNT to see if it’s greater than zero and act accordingly. Usually ROLLBACK the transaction.
Transactions can span batches, so you can execute a rollback in a subsequent batch.