嵌套事务模版

DECLARE @TranCounter INT
BEGIN TRY
    SET @TranCounter = @@TRANCOUNT
    IF @TranCounter > 0 
    BEGIN 
        SAVE TRANSACTION preSavePoint;  
    END
    ELSE  
    BEGIN
        BEGIN TRANSACTION; 
    END
 
    .........

    IF @TranCounter = 0
    BEGIN
        COMMIT TRANSACTION
    END
END TRY
BEGIN CATCH
    IF @TranCounter = 0
    BEGIN    
        ROLLBACK TRANSACTION
    END
    ELSE IF XACT_STATE() <> -1
    BEGIN
        ROLLBACK TRANSACTION preSavePoint

        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
END CATCH