SQL Server存储过程中的错误处理

Question

我有一个相当复杂的SP(逻辑方面)与嵌套IF BEGIN END ELSE,在这个嵌套逻辑中有多个端点逻辑失败,我RAISERROR和两个地方导致成功和SQL被操作.

如何,在SP的最后我可以捕获错误并做一个 IF Error Count>0 THEN ROLLBACK

DECLARE @errCount int=0
DECLARE @DataSetCount int=0
DECLARE @countCurrent int=0
DECLARE @countHistorical int=0


IF (isnumeric(@DataSetID)=(0) OR @DataSetID=(0)) 
BEGIN
    RAISERROR('The DataSet specfied does not appear to be valid', 5, 1)
END
ELSE
IF  (@Destination='C' OR @Destination='H') 
    BEGIN
        if Exists (SELECT NULL from tblOpportunityDataSets where DataSetID=@DataSetID)
        BEGIN
            SET @countCurrent=(SELECT COUNT(1) from tblOptyRecordsCurrent where DataSetID=@DataSetID)
            SET @countHistorical=(SELECT COUNT(1) from tblOptyRecordsHistorical where DataSetID=@DataSetID)
            IF @destination='C'
            BEGIN
                if @countCurrent>0 
                BEGIN
                    RAISERROR('There are already existing records in the Current Tables for the specified DataSet', 5, 1)
                END ELSE
                if @countHistorical=0 
                BEGIN
                    RAISERROR('There do not appear to be any records in the Historical Tables to transfer for the specified Dataset', 5, 1)
                END ELSE
                BEGIN
                    -- ENTER TRANSFER CODE
                    INSERT INTO tblRecordsHistorical
                    ( X, Y, Z ) 
                    SELECT X, Y, Z  FROM tblA
                    WHERE x=y
                    -- Check that record count in both tables match
                    SET @countCurrent=(SELECT COUNT(1) from tblOptyRecordsCurrent where DataSetID=@DataSetID)
                    SET @countHistorical=(SELECT COUNT(1) from tblOptyRecordsHistorical where DataSetID=@DataSetID)
                    IF (@countCurrent<>@countHistorical)
                    BEGIN
                        RAISERROR('There was an error whilst copying the records into the Historical Tables, Source and Destination Record Count do not match', 5, 1)
                    END ELSE
                    BEGIN


                    END
                END
            END ELSE
            IF @Destination='H'
            BEGIN
                if @countHistorical>0 
                BEGIN
                    RAISERROR('There are already existing records in the Historical Tables for the specified DataSet', 5, 1)
                END ELSE
                if @countCurrent=0 
                BEGIN
                    RAISERROR('There do not appear to be any records in the Historical Tables to transfer for the specified Dataset', 5, 1)
                END ELSE
                BEGIN
                    RAISERROR('DataSet Found, ready to transfer records to HISTORICAL', 5, 1)       
                    -- ENTER TRANSFER CODE
                    INSERT INTO tblOptyRecordsCurrent
                    ( X, Y, Z ) 
                    SELECT X, Y, Z  FROM tblB
                    WHERE x=y
                    -- Check that record count in both tables match
                    SET @countCurrent=(SELECT COUNT(1) from tblOptyRecordsCurrent where DataSetID=@DataSetID)
                    SET @countHistorical=(SELECT COUNT(1) from tblOptyRecordsHistorical where DataSetID=@DataSetID)



                END
            END
        END
        ELSE
        BEGIN
            RAISERROR('The DataSet you have specified cannot be found', 5, 1)
        END
    END
    ELSE
    BEGIN
        RAISERROR('You have not specified a valid Destination', 5, 1)
    END

请注意,在包含INSERT INTO代码的两个部分中,将至少有两个额外的SQL操作语句,这些语句必须全部有效或者全部失败.

编辑:我已经离开了

BEGIN TRAN
BEGIN TRY
    -- STATEMENT 1
    INSERT INTO X WHERE Y
    -- STATEMENT 2
    DELETE FROM X WHERE Y
    -- STATEMENT 3
    UPDATE X WHERE Y
    COMMIT
END TRY
BEGIN CATCH
    ROLLBACK TRAN
    RAISERROR('There was an error whilst copying the records into the Current Tables.  The Transaction has been rolled back', 5, 1)
END CATCH                               

Answer 1

为了能够做到rollback,你需要begin transaction在一开始就做.

然后你要么commit或者rollback行动.

http://msdn.microsoft.com/en-us/library/ms174377

您可能会发现try/catch语法更容易

http://msdn.microsoft.com/en-us/library/ms175976(v=sql.90).aspx