SQL Server存儲過程避免光標

我有以下SQL Server存儲過程：SQL Server存儲過程避免光標

BEGIN TRAN 
CREATE TABLE #TempTable (
          SampleOrderID int, 
          SampleOrderNo varchar(512), 
          ChallanNoAndChallanDate varchar(MAX) 
         ) 
CREATE NONCLUSTERED INDEX #IX_Temp2_1 ON #TempTable(SampleOrderID) 

DECLARE 
@SQL as varchar(MAX) 
SET @SQL='  SELECT SampleOrderID, SampleOrderNo FROM SampleOrder WHERE SampleOrderID IN (37808,37805,37767,37571,37745,37772,37843,37394,37909,37905,37903) ' 
INSERT INTO #TempTable (SampleOrderID, SampleOrderNo) 
EXEC (@SQL) 

DECLARE 
@SampleOrderID as int, 
@ChallanNoAndChallanDate as varchar(max) 

DECLARE Cur_AB1 CURSOR GLOBAL FORWARD_ONLY KEYSET FOR   
SELECT SampleOrderID FROM #TempTable 
OPEN Cur_AB1 
FETCH NEXT FROM Cur_AB1 INTO @SampleOrderID 
WHILE(@@Fetch_Status <> -1) 
    BEGIN--2 
     SET @ChallanNoAndChallanDate='' 
     SELECT @ChallanNoAndChallanDate= COALESCE(@ChallanNoAndChallanDate+ ',', '') + CONVERT(VARCHAR(12),ChallanDate,106)+':'+ChallanNo FROM Challan WHERE OrderID [email protected] AND OrderType=2 

     UPDATE #TempTable SET [email protected] WHERE [email protected] 
     FETCH NEXT FROM Cur_AB1 INTO @SampleOrderID 
    END--2 
CLOSE Cur_AB1 
DEALLOCATE Cur_AB1 

SELECT * FROM #TempTable 
DROP TABLE #TempTable 
COMMIT TRAN

輸出：

SamID  SamNo ChallanNoAndDaet 
37394 37394 ,31 May 2012:151592 
37571 37571 ,31 May 2012:151580 
37745 37745 ,31 May 2012:151582 
37767 37767 ,30 May 2012:151507,31 May 2012:151576 
37772 37772 ,31 May 2012:151587 
37805 37805 ,31 May 2012:151574 
37808 37808 ,31 May 2012:151573 
37843 37843 ,31 May 2012:151588 
37903 37903 ,31 May 2012:151597 
37905 37905 ,31 May 2012:151596 
37909 37909 ,31 May 2012:151593

它可以成功地爲數據量小，但是當我試圖在執行它大量（即超過500,000條記錄）我的C＃接口拋出超時異常。

任何人都可以幫我編輯我的存儲過程，以避免光標？

感謝您的回覆。

來源

2012-06-18 Mohammed Faruk

它叫** **存儲過程，因爲它是** **存儲內部SQL Server - 它不是一個*商店*程序，與*商店*沒有任何關係。 –

我認爲[更新內連接]（http://www.bennadel.com/blog/938-Using-A-SQL-JOIN-In-A-SQL-UPDATE-Statement-Thanks-John-Eric-.htm ）是這種情況下的方法。 – Rab

我通常使用類似如下：

SELECT @SampleOrderID = MIN (SampleOrderID) FROM #TempTable 
WHILE @SampleOrderID IS NOT NULL 
BEGIN 

    SET @ChallanNoAndChallanDate='' 
    SELECT @ChallanNoAndChallanDate= COALESCE(@ChallanNoAndChallanDate+ ',', '') + CONVERT(VARCHAR(12),ChallanDate,106)+':'+ChallanNo FROM Challan WHERE OrderID [email protected] AND OrderType=2 

    UPDATE #TempTable SET [email protected] WHERE [email protected] 

    SELECT @SampleOrderID = MIN (SampleOrderID) FROM #TempTable WHERE SampleOrderID > @SampleOrderID 

END

此代碼將取代你的光標的東西。

來源

2012-06-18 05:11:31 SchmitzIT

我利用這一點避免光標到處我需要

DECLARE @num_rows  int 
DECLARE @cnt   int 
DECLARE @selected  int 

DECLARE @table1 TABLE (Id int not null primary key identity(1,1), col1 int) 
INSERT into @table1 (col1) SELECT col1 FROM table2 
SET @[email protected]@ROWCOUNT 

SET @cnt=0 
WHILE @cnt<@num_rows 
BEGIN 
    SET @[email protected]+1 
    SELECT 
     @selected=col1 
     FROM @table1 
     WHERE [email protected] 

    --do your stuff here-- 

END

來源

2013-09-02 08:55:56

SQL Server存儲過程避免光標

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