Question

我有一个用SQL编写的信用卡支付流程存储过程。这是在循环使用50万条付款记录时使用SQL。这非常慢，因为我必须为每个支付记录循环另一组数据并相应地更新一堆表。这意味着while循环内部while循环在sql中。

我必须在c＃中重写它以提高性能。我们正在使用LINQ＆amp;实体框架。任何人都可以建议我这是否有帮助？

由于

使用修改后的存储过程更新我的问题。我已经替换了对表的引用并删除了部分代码。但如果不清楚，请告诉我。

CREATE PROCEDURE [dbo].[USP_ProcessPayments]
(
      @UserKey int
)

AS
BEGIN

SET NOCOUNT ON;

CREATE TABLE #TempUserPayments
(
      -- with Columns declared
)


INSERT INTO #TempUserPayments 
SELECT DISTINCT up.*, ROW_NUMBER() OVER(ORDER BY up.UserKey DESC, up.DateReceived) AS RN  --generate row number
FROM  UserPayment up 
where up.UserKey = @UserKey

CREATE INDEX UP_1 on #TempUserPayments (RN);

        DECLARE @LOOPCOUNTER INT, @ROWCOUNTER INT, @REQUESTEDAMOUNT MONEY, @UPDATEDREQUESTEDAMOUNT MONEY, @AMOUNT MONEY, 
                @AMOUNTNOTAPPLIED MONEY, @APPLIEDAMOUNT MONEY, @SYSTEMKEY INT, @LOOPCOUNTER_PR INT, @ROWCOUNTER_PR INT, @IS_UPDATE BIT


        SELECT @ROWCOUNTER = COUNT(*) from #TempUserPayments;
        SET @LOOPCOUNTER = 1
        WHILE (@LOOPCOUNTER <= @ROWCOUNTER)
        BEGIN
                    SELECT *,
                    ROW_NUMBER() OVER (ORDER BY mp.Month DESC, mp.PayPriority) AS RN_PR
                    INTO #TempPR
                    FROM Requests pr
                    INNER JOIN Premium mp ON mp.PremiumKey = pr.PremiumKey
                    --Joing couple of other tables here
                    ORDER BY mp.[Month] DESC, mp.PayPriority  

                    CREATE INDEX PR_1 on #TempPR (RN_PR);


                    SELECT @SYSTEMKEY =  SystemKey FROM #TempUserPayments WHERE RN = @LOOPCOUNTER;
                    SELECT @ROWCOUNTER_PR = COUNT(*) from #TempPR;
                    SET @LOOPCOUNTER_PR = 1


                    WHILE (@LOOPCOUNTER_PR <= @ROWCOUNTER_PR)
                    BEGIN
                              SET @IS_UPDATE = 0;                                 

                              IF(@APPLIEDAMOUNT IS NULL OR (@REQUESTEDAMOUNT <> @APPLIEDAMOUNT AND @APPLIEDAMOUNT < @REQUESTEDAMOUNT))
                              BEGIN 

                                    IF(@SYSTEMKEY = 1 OR @SYSTEMKEY = 3)
                                    BEGIN
                                        --Check all the conditions here
                                        SET @IS_UPDATE = 1;
                                    END


                                    IF(@IS_UPDATE = 1)
                                    BEGIN

                                                --Update bunch of requets tables ---

                                                INSERT INTO userpaid
                                                (
                                                  --Column names --
                                                )
                                                VALUES 
                                                (
                                                    --Values --
                                                )
                                    END 
                              END
                    --     END
                          SET @LOOPCOUNTER_PR = @LOOPCOUNTER_PR + 1;

                 END

              SET @LOOPCOUNTER = @LOOPCOUNTER + 1;
              DROP TABLE #TempPR;

        END  

              DROP TABLE #TempUserPayments;

END

SQL while循环还是c＃linq foreach？

0 个答案: