原文:
SQL Server 事務嵌套
示例代碼:
DECLARE @TranCounter INT ; SET @TranCounter = @@TRANCOUNT ; IF @TranCounter > 0 -- Procedure called when there is -- an active transaction. -- Create a savepoint to be able -- to roll back only the work done -- in the procedure if there is an -- error. SAVE TRANSACTION ProcedureSave; ELSE -- Procedure must start its own -- transaction. BEGIN TRANSACTION ; -- Modify database. BEGIN TRY /* * Write your T-SQL here... * */ -- Get here if no errors; must commit -- any transaction started in the -- procedure, but not commit a transaction -- started before the transaction was called. IF @TranCounter = 0 -- @TranCounter = 0 means no transaction was -- started before the procedure was called. -- The procedure must commit the transaction -- it started. COMMIT TRANSACTION ; END TRY BEGIN CATCH -- An error occurred; must determine -- which type of rollback will roll -- back only the work done in the -- procedure. IF @TranCounter = 0 -- Transaction started in procedure. -- Roll back complete transaction. ROLLBACK TRANSACTION ; ELSE -- Transaction started before procedure -- called, do not roll back modifications -- made before the procedure was called. IF XACT_STATE() <> - 1 -- If the transaction is still valid, just -- roll back to the savepoint set at the -- start of the stored procedure. ROLLBACK TRANSACTION ProcedureSave; -- If the transaction is uncommitable, a -- rollback to the savepoint is not allowed -- because the savepoint rollback writes to -- the log. Just return to the caller, which -- should roll back the outer transaction. -- After the appropriate rollback, echo error -- information to the caller. DECLARE @ErrorMessage NVARCHAR ( 4000 ); DECLARE @ErrorSeverity INT ; DECLARE @ErrorState INT ; SELECT @ErrorMessage = ERROR_MESSAGE(); SELECT @ErrorSeverity = ERROR_SEVERITY(); SELECT @ErrorState = ERROR_STATE(); RAISERROR ( @ErrorMessage , @ErrorSeverity , @ErrorState ); END CATCH
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