COMMIT TRANSACTION请求没有相应的BEGIN TRANSACTION

Question

What is the problem with this code.

It is giving this error The COMMIT TRANSACTION request has no corresponding BEGIN TRANSACTION. when some exception is coming in the procedure. How can I solve it?

    BEGIN 
    BEGIN TRANSACTION 
    DECLARE  
         @Id bigint 
        ,@Month nvarchar(100) 
        ,@Year nvarchar(100) 
        ,@CountryofExport nvarchar(100)
        ,@CountryofOrigin nvarchar(100) 
        ,@HSCode nvarchar(100)
        ,@Unit nvarchar(100)
        ,@Quantity nvarchar(100)
        ,@CustomValue nvarchar(255)
        ,@Type nvarchar(100)
        ,@TypeBit bit
        ,@CountryofExportID int
        ,@CountryofOriginID int
        ,@MeasurementId int
        ,@Remarks nvarchar(500)
        ,@CommodityId int
        ,@SDate nvarchar(100)
        ,@SameRec int
        ,@counts int


    DECLARE @Cursor_TradeFlow CURSOR
    SET @Cursor_TradeFlow = CURSOR FOR

    SELECT [Id],[Months],[Years],[CountryofExport],[CountryofOrigin],[HSCode],[Quantity],[Unit],[CustomValue],[Type] FROM [Temp_Trading]    

    OPEN @Cursor_TradeFlow
    FETCH NEXT FROM @Cursor_TradeFlow INTO @Id, @Month, @Year, @CountryofExport, @CountryofOrigin, @HSCode,@Quantity, @Unit, @CustomValue, @Type

    WHILE @@FETCH_STATUS = 0

    BEGIN
    Set @Remarks='';




   Declare @EICountry varchar(100),
   @Checkbit bit,
    @CheckYearIsNumeric bit,
    @CheckMonthIsNumeric bit


      BEGIN TRY        

         SET @CheckMonthIsNumeric= convert(INT, @Month);

      END TRY 

      BEGIN CATCH
    begin

             set @Checkbit=1;
         set @Remarks = @Remarks + 'Invalid Month'
         set @CheckMonthIsNumeric=1 
         end
      END CATCH



      BEGIN TRY

          set @CheckYearIsNumeric=  convert(INT, @Year);

      END TRY
      BEGIN CATCH


        SET @CheckYearIsNumeric= 1;
        set @Checkbit=1;
        set @Remarks = @Remarks + 'Invalid Year'

      END CATCH      


    Set @SameRec = (Select COUNT(*) From TradeFlow Where int_Month = @CheckMonthIsNumeric and int_Year = @CheckYearIsNumeric
                  and int_OriginLocationId = @CountryofExportID and int_DestinationLocationId = @CountryofOriginID and int_CommodityId = @CommodityId
                  and int_MeasurementId = @MeasurementId)   


    IF @@ERROR <> 0
    BEGIN
         ROLLBACK
    END

    FETCH NEXT FROM @Cursor_TradeFlow INTO @Id, @Month, @Year, @CountryofExport, @CountryofOrigin, @HSCode,@Quantity, @Unit, @CustomValue, @Type

    END
    CLOSE @Cursor_TradeFlow
    DEALLOCATE @Cursor_TradeFlow
    COMMIT
END

Answer 1

Having:

IF @@ERROR <> 0
BEGIN
     ROLLBACK
END

inside a cursor loop is a bad sign - you rollback the transaction, and then continue into the next iteration. When the loop finally finishes, you attempt to commit and - Oops - there's no open transaction any longer, and every operation after the rollback has been left in place.

You might want to exit the loop after the rollback using a GOTO , or deal with the errors in a different way. It's too hard to tell what the best strategy might be.

Answer 2

You could use named transactions:

-- big transaction in the beginning
BEGIN TRANSACTION BIG_TRANSACTION

 -- your code here -- a transaction for each fetched item BEGIN TRANSACTION FETCH_TRANSACTION -- your code here if OK COMMIT TRANSACTION FETCH_TRANSACTION else ROLLBACK TRANSACTION FETCH_TRANSACTION 

COMMIT/ROLLBACK TRANSACTION BIG_TRANSACTION