我有一个现有的存储过程，用于获取我的数据库系统的可用预订。我目前作为属性传递当前日期以显示特定日期的所有预订。我想做的是传递日期范围（使用CTE）作为＆＃34;日期＆＃34;查询的一部分，所以我可以在一个完整的范围内而不是仅仅一天内完成所有预订。
下面是我现有的存储过程：如下所示，我在select语句（和子查询）中使用@CurrentDay属性。我如何使用CTE（在帖子的底部）和基本上＃34;每个＆＃34;它而不是使用当前传递的日期？
ALTER PROCEDURE [dbo].[GetUpcomingTrialSlots]
@LocationId int,
@CurrentDateTime datetime
AS
BEGIN
declare @CurrentDay Date
declare @WindowTimeStart DateTime
set datefirst 1
select @CurrentDay = CONVERT(date, @CurrentDateTime)
select @WindowTimeStart = CONVERT(time,@CurrentDateTime)
-- Day One
SELECT * FROM
(
select ts.id TimeSlotId,
@locationId LocationId,
@CurrentDay BookingDay,
datename(dw,DATEPART(dw, @CurrentDay)-1) DayOfWeek,
ts.StartTime,
COALESCE(
(select top 1 AvailableSlots
FROM TrialTimeBlockOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.EndTime AS DATETIME))
between
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
)
,
(select top 1 AvailableSlots from TrialTimeBlock where DayOfWeek = DATEPART(dw, @CurrentDay)
and ts.StartTime >= starttime and ts.StartTime < endtime and LocationId = @LocationId)
) as AvailableSlots,
ts.EndTime,
case
when
EXISTS (select * from TrialTimeBlock where ts.StartTime >= StartTime and ts.StartTime < EndTime and LocationId = @LocationId and DayOfWeek = datepart(dw, @CurrentDay)) THEN CAST(1 AS BIT)
else CAST(0 AS BIT)
end as TrialSlot,
case
when
EXISTS (
SELECT *
FROM TrialTimeBlockOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
and
AvailableSlots = 0
) THEN 0 /*This doesn't seem right to me */
else 1
end as [TrialTimeAvailable],
case
when
EXISTS (
SELECT *
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
and
AvailableSlots = 0
) THEN 'Closed' /*This doesn't seem right to me */
else 'Open'
end as [OpenStatus],
case
when
(select count(*) from InitialAssessment where LocationId = @LocationId and TimeSlotId = ts.Id and AssessmentDate = @CurrentDay) > 1 THEN 'true'
else 'false'
end as HasAssessment,
(select count(*) from InitialAssessment where LocationId = @LocationId and TimeSlotId = ts.Id and AssessmentDate = @CurrentDay and IsFriendRecommendation is null) as AssessmentCount,
case
when
EXISTS (
SELECT *
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId
) THEN
(SELECT OverrideReason
FROM OpeningHourOverride
where CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
>=
CONVERT(datetime, CAST(OverrideStartDate AS DATETIME) + CAST(AltOpenTime AS DATETIME))
and
CONVERT(datetime, CAST(@CurrentDay AS DATETIME) + CAST(ts.StartTime AS DATETIME))
<
CONVERT(datetime, CAST(OverrideEndDate AS DATETIME) + CAST(AltCloseTime AS DATETIME))
and
LocationId = @LocationId)
/*This doesn't seem right to me */
else ''
end as ClosureReason
from Timeslot ts
left join OpeningHour oh
on @locationId = oh.LocationId
and oh.DayOfWeek = DATEPART(dw, @CurrentDay)
where ts.StartTime >= oh.OpenTime
and ts.EndTime < oh.CloseTime
and datepart(minute,ts.StartTime) = 0
and CAST(ts.StartTime as DateTime) > @WindowTimeStart
) T WHERE TrialSlot = 1
AND AssessmentCount <AvailableSlots
And OpenStatus = 'Open'
AND TrialTimeAvailable = 1
order by
BookingDay,
StartTime
END
CTE示例SQL
declare @StartDate date = '2017-01-01'
declare @EndDate date = '2017-01-10'
;WITH cte AS (
SELECT @StartDate AS TrialDate
UNION ALL
SELECT DATEADD(day,1,TrialDate) as currentDate
FROM cte
WHERE DATEADD(day,1,TrialDate) <= @EndDate
)
答案 0 :(得分：2)
两个快速选项：
选项1 - Ad-hoc Tally Table
Declare @Date1 date = '2017-01-01'
Declare @Date2 date = '2017-01-10'
Select Top (DateDiff(DD,@Date1,@Date2)+1) D=DateAdd(DD,-1+Row_Number() Over (Order By Number),@Date1) From master..spt_values
<强>返回
D
2017-01-01
2017-01-02
2017-01-03
2017-01-04
2017-01-05
2017-01-06
2017-01-07
2017-01-08
2017-01-09
2017-01-10
选项2：表值函数
提供更多选项：用户提供的日期/时间范围，DatePart和增量，并且比CTE更快。也很容易合并到子查询和/或CROSS APPLY。
Declare @Date1 date = '2017-01-01'
Declare @Date2 date = '2017-01-10'
Select * from [dbo].[udf-Range-Date](@Date1,@Date2,'DD',1)
返回
RetSeq RetVal
1 2017-01-01 00:00:00.000
2 2017-01-02 00:00:00.000
3 2017-01-03 00:00:00.000
4 2017-01-04 00:00:00.000
5 2017-01-05 00:00:00.000
6 2017-01-06 00:00:00.000
7 2017-01-07 00:00:00.000
8 2017-01-08 00:00:00.000
9 2017-01-09 00:00:00.000
10 2017-01-10 00:00:00.000
感兴趣的UDF
CREATE FUNCTION [dbo].[udf-Range-Date] (@R1 datetime,@R2 datetime,@Part varchar(10),@Incr int)
Returns Table
Return (
with cte0(M) As (Select 1+Case @Part When 'YY' then DateDiff(YY,@R1,@R2)/@Incr When 'QQ' then DateDiff(QQ,@R1,@R2)/@Incr When 'MM' then DateDiff(MM,@R1,@R2)/@Incr When 'WK' then DateDiff(WK,@R1,@R2)/@Incr When 'DD' then DateDiff(DD,@R1,@R2)/@Incr When 'HH' then DateDiff(HH,@R1,@R2)/@Incr When 'MI' then DateDiff(MI,@R1,@R2)/@Incr When 'SS' then DateDiff(SS,@R1,@R2)/@Incr End),
cte1(N) As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
cte2(N) As (Select Top (Select M from cte0) Row_Number() over (Order By (Select NULL)) From cte1 a, cte1 b, cte1 c, cte1 d, cte1 e, cte1 f, cte1 g, cte1 h ),
cte3(N,D) As (Select 0,@R1 Union All Select N,Case @Part When 'YY' then DateAdd(YY, N*@Incr, @R1) When 'QQ' then DateAdd(QQ, N*@Incr, @R1) When 'MM' then DateAdd(MM, N*@Incr, @R1) When 'WK' then DateAdd(WK, N*@Incr, @R1) When 'DD' then DateAdd(DD, N*@Incr, @R1) When 'HH' then DateAdd(HH, N*@Incr, @R1) When 'MI' then DateAdd(MI, N*@Incr, @R1) When 'SS' then DateAdd(SS, N*@Incr, @R1) End From cte2 )
Select RetSeq = N+1
,RetVal = D
From cte3,cte0
Where D<=@R2
)
/*
Max 100 million observations -- Date Parts YY QQ MM WK DD HH MI SS
Syntax:
Select * from [dbo].[udf-Range-Date]('2016-10-01','2020-10-01','YY',1)
Select * from [dbo].[udf-Range-Date]('2016-01-01','2017-01-01','MM',1)
*/
答案 1 :(得分：0)
假设您可以将存储过程转换为TVF
Declare @Date1 date = '2017-01-01'
Declare @Date2 date = '2017-01-10'
Declare @LocationId int = 1
Select A.D -- << Optional
,B.*
From (Select Top (DateDiff(DD,@Date1,@Date2)+1) D=DateAdd(DD,-1+Row_Number() Over (Order By Number),@Date1) From master..spt_values) A
Cross Apply (
Select *
From [dbo].[tvf_GetUpcomingTrialSlots](@LocationId,A.D)
Order By BookingDay,StartTime
) B