我使用下面的代码来检查特定行的列@act_value是否高于24.0，用光标循环遍历表的每一行。如果@act_value高于24.0，则将完成若干操作以及更新该条目并插入新条目。也就是说，查询需要超过26分钟才能运行（从下面提供此添加之前的0:16分钟开始）并且可能过于耗费资源。是否有更好的配置可以加快此操作？
DECLARE cur_hours_check CURSOR
FOR
SELECT
Period, Act_Batch_Time, Kg_Per_Hour, Total_QT_Produced,
Total_Possible_KG,
--The columns not affected but need for inserting the shadow day
Division, Region, Business_Region, Plant, Work_Center, DaysInMonth,
Total_Possible_Hours, Demonstrated_Capacity
FROM
zt_Demonstrated_Capacity_Trend
OPEN cur_hours_check
DECLARE --Cursor Variables Pulling data
@period datetime
, @act_hours float
, @over_hours float
, @Total_QT_Produced float
, @KG_per_hour float
, @Total_Possible_KG float
--then the extra
, @Division varchar(20)
, @Region varchar(20)
, @Business_Region varchar(20)
, @Plant varchar(40)
, @Work_Center varchar(40)
, @DaysInMonth float
, @Total_Possible_Hours float
, @Demonstrated_Capacity float
DECLARE --Cursor Shadow variables:
@shadow_period datetime
, @shadow_act_hours float
, @shadow_Total_QT_Produced float
, @shadow_Total_Possible_KG float
, @shadow_Percent_of_Total_Hours float
DECLARE --Cursor adjusted first day variables
@adj_act_hours float
, @adj_Total_QT_Produced float
, @adj_Total_Possible_KG float
, @adj_Percent_of_Total_Hours float
FETCH FROM cur_hours_check
INTO @period, @act_hours, @KG_per_hour, @Total_QT_Produced, @Total_Possible_KG
,@Division, @Region, @Business_Region, @Plant, @Work_Center, @DaysInMonth, @Total_Possible_Hours, @Demonstrated_Capacity
WHILE @@FETCH_STATUS = 0
BEGIN
IF @act_hours > 24.0
BEGIN
-- Setting the shadow period to carry over values relative to 24 hour time window
SET @shadow_period = dateadd(dd, datediff(dd, 0, @period) + 1, 0)
SET @shadow_act_hours = @act_hours - 24.0
SET @shadow_Total_QT_Produced = (@Total_QT_Produced - (@KG_per_hour * @shadow_act_hours))
SET @shadow_Percent_of_Total_Hours = (@shadow_act_hours/24.0)*100
-- Adjusting first period for 24 hour window of operation
SET @adj_act_hours = 24.0
SET @adj_Total_QT_Produced = @Total_QT_Produced - (@KG_per_hour * 24.0)
SET @adj_Total_Possible_KG = @Total_Possible_KG *(1-( @shadow_act_hours/@act_hours ))
SET @adj_Percent_of_Total_Hours = 100
-- now update that record, as well as insert the shadow day
UPDATE zt_Demonstrated_Capacity_Trend
SET Period = @period
, Act_Batch_Time = 24.0
, Total_QT_Produced = @adj_Total_QT_Produced
, Total_Possible_KG = @adj_Total_Possible_KG
, Kg_Per_Hour = @KG_per_hour
, Percent_of_Total_Hours = @adj_Percent_of_Total_Hours
, Division = @Division
, Region = @Region
, Business_Region = @Business_Region
, Plant = @Plant
, Work_Center = @Work_Center
, DaysInMonth = @DaysInMonth
, Total_Possible_Hours = @Total_Possible_Hours
, Demonstrated_Capacity = @Demonstrated_Capacity
WHERE CURRENT OF cur_hours_check
--Inserting the shadow record
INSERT INTO [dbo].[zt_Demonstrated_Capacity_Trend](
[Period]
,[Division]
,[Region]
,[Business_Region]
,[Plant]
,[Work_Center]
,[Kg_Per_Hour]
,[Total_QT_Produced]
,[Act_Batch_Time]
,[DaysInMonth]
,[Total_Possible_Hours]
,[Demonstrated_Capacity]
,[Total_Possible_KG]
,[Percent_of_Total_Hours])
VALUES
(@shadow_period
,@Division
,@Region
,@Business_Region
,@Plant
,@Work_Center
,@Kg_Per_Hour
,@shadow_Total_QT_Produced
,@shadow_act_hours
,@DaysInMonth
,@Total_Possible_Hours
,@Demonstrated_Capacity
,@adj_Total_Possible_KG
,@shadow_Percent_of_Total_Hours)
END
FETCH NEXT FROM cur_hours_check
INTO @period, @act_hours, @KG_per_hour, @Total_QT_Produced, @Total_Possible_KG
,@Division, @Region, @Business_Region, @Plant, @Work_Center, @DaysInMonth, @Total_Possible_Hours, @Demonstrated_Capacity
END;
CLOSE cur_hours_check
DEALLOCATE cur_hours_check
答案 0 :(得分：1)
使用TSQL进行基于集合的操作，我已经对您使用过的变量进行了修改，并在SQLFiddle设置了一个样本，用于完成拆分单个记录剩下的24小时多于24小时。这是工作：
BEGIN TRAN
INSERT INTO zt_Demonstrated_Capacity_Trend (
-- The Columns we care about modifying
period, Act_Batch_Time, Total_QT_Produced, KG_per_hour, Total_Possible_KG, Percent_of_Total_Hours
-- The rest that you aren't touching in your procedure
, Division, Region, Business_Region, Plant, Work_Center, DaysInMonth, Total_Possible_Hours, Demonstrated_Capacity, over_hours
)
SELECT
-- Add a day equal to the rows we generate
DATEADD(dd,ShadowDays, Period) AS Shadow_Period
-- Hours we generate
, ShadowHours AS Shadow_Hours
-- Our Hours times the rate is total produced
, Kg_Per_Hour * ShadowHours AS Shadow_Total_QT_Produced
-- Unmodified Kg_Per_Hour
, Kg_Per_Hour
-- Unmodified Kg_Per_Hour times 24 is total in a day possible.
, Kg_Per_Hour * 24.0 as Total_Possible_KG
-- Our hours divided by hours in a day
, ShadowHours / 24.0 * 100 AS Shadow_Percent_of_Total_Hours
-- the rest
, Division, Region, Business_Region, Plant, Work_Center, DaysInMonth, Total_Possible_Hours, Demonstrated_Capacity, over_hours
FROM zt_Demonstrated_Capacity_Trend T
CROSS APPLY (
SELECT
ROWID-1 AS ShadowDays
, CASE WHEN CAST(T.Act_Batch_Time AS NUMERIC(38,15)) - ROWID*24 > 0 THEN 24 ELSE CAST(T.Act_Batch_Time AS NUMERIC(38,15)) % 24.0 END AS ShadowHours
FROM (
SELECT ROW_NUMBER()OVER(ORDER BY S.NAME) AS ROWID
FROM master..spt_values S
) X
WHERE T.Act_Batch_Time - ((ROWID-1)*24) > 0
) Z
WHERE T.Act_Batch_Time > 24
DELETE FROM zt_Demonstrated_Capacity_Trend WHERE Act_Batch_Time> 24
COMMIT TRAN
使用交叉应用，并获取我们可以分割给定值的人工行，然后我使用小时和天数以各种方式放入select语句以获得预期效果。您希望在单个事务中隔离它以防止insert和delete语句之间的新插入。这将比使用谓词的光标更好。