1. 一個預存程序最好只有一個事務;多個事務既消耗資源,也容易產生錯誤;
2. 建立事務和結束事務的時候最好有這樣的判斷:
Code
IF @@TRANCOUNT = 0
BEGIN -- only if @@TRANCOUNT is 0, we do BEGIN TRAN
BEGIN TRANSACTION
SET @TransactionIsOurs = 1
END
IF @TransactionIsOurs = 1
BEGIN
COMMIT TRANSACTION
-- SET @TransactionIsOurs = 0
END
IF @TransactionIsOurs = 1 AND @@TRANCOUNT > 0
ROLLBACK TRANSACTION
3. 如果事務很長,可以在適當的位置多加幾個錯誤判斷:
Code
IF @@Error <> 0
BEGIN
RAISERROR (50002, 16, 1, N'ApplyCheckedObjectsStage', N'spApplyCheckedObjectsStage', 10, N'Checked Agence Stage', @StrErrorParm) WITH LOG
SET @ReturnCode = -1000
GOTO exit_label
END
Note:@@Error必須直接跟在需要判斷的sql後面,中間不能間隔其他語句,因為@@Error總是取最新執行的結果,所以最好還是使用Try...Catch...
Code
USE AdventureWorks;
GO
BEGIN TRANSACTION;
BEGIN TRY
-- Generate a constraint violation error.
DELETE FROM Production.Product
WHERE ProductID = 980;
END TRY
BEGIN CATCH
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() as ErrorState,
ERROR_PROCEDURE() as ErrorProcedure,
ERROR_LINE() as ErrorLine,
ERROR_MESSAGE() as ErrorMessage;
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION;
END CATCH;
IF @@TRANCOUNT > 0
COMMIT TRANSACTION;
GO