如果只找到一条记录，确保不添加逗号，或者添加两条记录
Ensuring that a comma is not added if only one record is found, or that both are added
考虑下面的 SQL 查询，该查询旨在以 XML 的形式构建复杂的 return:
ISNULL(Logbook1 + ',', '') + ISNULL(Logbook2 + ',', '') + ISNULL(Logbook3 + ',', '') AS '@logBookNums',
本质上，这将搜索适当的记录。如果它发现 LogBook1、LogBook2 或 LogBook3 不存在记录，它将 return 一个空字符串。如果它在 LogBook1 中找到一条记录，它将 return 和一个尾随逗号。
不幸的是，这个 XML 发送到的 WCF 服务的记录令人震惊（实际上是 none 无论如何）并且它拒绝带有尾随逗号的单个日志编号。
我的猜测是它应该提交为：
logBookNums="12345,,"
或
logBookNums="12345"
我应该如何更改上面的 SQL 行以输出一个或另一个，并且（如果查询找到两个日志编号）生成如下输出：
logBookNums="12345,12346,"
或
logBookNums="12345,12346"
这是整个查询，我需要插入一个解决方案来处理@logBookNums 和@landingDecNums 的这种困境。
CREATE PROCEDURE dbo.CreateErsSalesAddSubmissionXmlByDateRange
-- Add the parameters for the stored procedure here
@uname VARCHAR(10) ,
@pword VARCHAR(10) ,
@sntype VARCHAR(1) ,
@action VARCHAR(10) ,
@salesContractRef VARCHAR(10),
@auctionId NCHAR(10) ,
@startDate DATE,
@endDate DATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT
RTRIM(@uname) AS '@uname',
RTRIM(@pword) AS '@pword',
(SELECT
@snType AS '@snType',
RTRIM(@action) AS '@action',
COALESCE(@salesContractRef, '') AS '@salesContractRef',
CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate',
RTRIM(COALESCE(@auctionID, '')) AS '@auctionID',
ISNULL(Logbook1 + ',', '') + ISNULL(Logbook2 + ',', '') + ISNULL(Logbook3 + ',', '') AS '@logBookNums',
ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums',
COALESCE(VesselName, '') AS '@vesselName',
RTRIM(VesselPLN) AS '@vesselPln',
RTRIM(VesselOwner) AS '@vesselMasterOwner',
COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1',
COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2',
COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3',
RTRIM(CountryOfLanding) AS '@countryOfLanding',
RTRIM(PortOfLanding) AS '@landingPortCode',
RTRIM(lh1.LandingId) AS '@internalRef',
(SELECT
COALESCE(RTRIM(SpeciesCode),'') AS '@speciesCode',
RTRIM(FishingArea) AS '@faoAreaCode',
COALESCE(RTRIM(IcesZone),'') AS '@ZoneCode',
COALESCE(RTRIM(ld.DisposalCode),'') AS '@disposalCode',
COALESCE(ld.FreshnessGrade,'') AS '@freshnessCode',
COALESCE(ld.ProductSize,'') AS '@sizeCode',
COALESCE(ld.PresentationCode,'') AS '@presentationCode',
COALESCE(ld.PresentationState,'') AS '@stateCode',
RTRIM(ld.NumberOfFish) AS '@numberOfFish',
FORMAT(ld.Quantity, 'N2') AS '@weightKgs',
FORMAT(Quantity * ld.UnitPrice, 'N2') AS '@value',
COALESCE(ld.Currency,'') AS '@currencyCode',
RTRIM(ld.WithdrawnDestinationCode) AS '@withdrawnDestinationCode',
RTRIM(ld.BuyersRegistrationCode) AS '@buyerReg',
RTRIM(ld.SalesContractRef) AS '@salesContractRef'
FROM LandingDetails ld
JOIN LandingHeaders lh
ON ld.LandingId = lh.LandingId
WHERE ld.LandingId = lh1.LandingId
FOR XML PATH ('salesline'), TYPE)
FROM LandingHeaders lh1
WHERE lh1.AllocatedErsId IS NULL AND lh1.LandingDate1 BETWEEN @startDate AND @endDate
ORDER BY VesselName,lh1.LandingId
FOR XML PATH ('salesnote'), TYPE)
FOR XML PATH ('ers')
END
GO
编辑（我在下面的回答中尝试过）
SELECT
RTRIM(@uname) AS '@uname'
,RTRIM(@pword) AS '@pword'
,(SELECT
@snType AS '@snType'
,RTRIM(@action) AS '@action'
,COALESCE(@salesContractRef, '') AS '@salesContractRef'
,CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate'
,RTRIM(COALESCE(@auctionID, '')) AS '@auctionID'
,(
SELECT ',' + CAST(LogbookX AS VARCHAR(100))
FROM
(
VALUES(Logbook1),(Logbook2),(Logbook3)
) AS x(LogbookX)
FOR XML PATH('')
),1,1,'')
AS NumList(Concatenated)
WHERE NumList.Concatenated IS NOT NULL AS '@logBookNums'
,ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums'
,COALESCE(VesselName, '') AS '@vesselName'
,RTRIM(VesselPLN) AS '@vesselPln'
,RTRIM(VesselOwner) AS '@vesselMasterOwner'
,COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1'
,COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2'
,COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3'
,RTRIM(CountryOfLanding) AS '@countryOfLanding'
,RTRIM(PortOfLanding) AS '@landingPortCode'
,RTRIM(lh1.LandingId) AS '@internalRef'
额外编辑以帮助澄清下面答案中的评论
完整修改后的查询现在如下所示：
CREATE PROCEDURE dbo.CreateErsSalesAddSubmissionXmlByDateRange
-- Add the parameters for the stored procedure here
@uname VARCHAR(10),
@pword VARCHAR(10),
@sntype VARCHAR(1),
@action VARCHAR(10),
@salesContractRef VARCHAR(10),
@auctionId NCHAR(10),
@startDate DATE,
@endDate DATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT
RTRIM(@uname) AS '@uname'
,RTRIM(@pword) AS '@pword'
,(SELECT
@snType AS '@snType'
,RTRIM(@action) AS '@action'
,COALESCE(@salesContractRef, '') AS '@salesContractRef'
,CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate'
,RTRIM(COALESCE(@auctionID, '')) AS '@auctionID'
,STUFF
((SELECT
',' + CAST(LogbookX AS VARCHAR(100))
FROM (
VALUES (Logbook1), (Logbook2), (Logbook3)
) AS x (LogbookX)
FOR XML PATH (''))
, 1, 1, '')
AS '@logBookNums'
,ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums'
,COALESCE(VesselName, '') AS '@vesselName'
,RTRIM(VesselPLN) AS '@vesselPln'
,RTRIM(VesselOwner) AS '@vesselMasterOwner'
,COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1'
,COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2'
,COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3'
,RTRIM(CountryOfLanding) AS '@countryOfLanding'
,RTRIM(PortOfLanding) AS '@landingPortCode'
,RTRIM(lh1.LandingId) AS '@internalRef'
,(SELECT
COALESCE(RTRIM(SpeciesCode), '') AS '@speciesCode'
,RTRIM(FishingArea) AS '@faoAreaCode'
,COALESCE(RTRIM(IcesZone), '') AS '@ZoneCode'
,COALESCE(RTRIM(ld.DisposalCode), '') AS '@disposalCode'
,COALESCE(ld.FreshnessGrade, '') AS '@freshnessCode'
,COALESCE(ld.ProductSize, '') AS '@sizeCode'
,COALESCE(ld.PresentationCode, '') AS '@presentationCode'
,COALESCE(ld.PresentationState, '') AS '@stateCode'
,RTRIM(ld.NumberOfFish) AS '@numberOfFish'
,FORMAT(ld.Quantity, 'N2') AS '@weightKgs'
,FORMAT(Quantity * ld.UnitPrice, 'N2') AS '@value'
,COALESCE(ld.Currency, '') AS '@currencyCode'
,RTRIM(ld.WithdrawnDestinationCode) AS '@withdrawnDestinationCode'
,RTRIM(ld.BuyersRegistrationCode) AS '@buyerReg'
,RTRIM(ld.SalesContractRef) AS '@salesContractRef'
FROM LandingDetails ld
JOIN LandingHeaders lh
ON ld.LandingId = lh.LandingId
WHERE ld.LandingId = lh1.LandingId
FOR XML PATH ('salesline'), TYPE)
FROM LandingHeaders lh1
WHERE lh1.AllocatedErsId IS NULL
AND lh1.LandingDate1 BETWEEN @startDate AND @endDate
ORDER BY VesselName, lh1.LandingId
FOR XML PATH ('salesnote'), TYPE)
FOR XML PATH ('ers')
END
GO
当有 logBookNums 时，我们的格式就会正确 xml，如下所示。
然而，如果没有，我们应该得到 logBookNums=""，但如您所见，我们什么也得不到。
你可以这样试试
您需要 "IN" 搜索，没有像 aNumber='123,345,678'
这样的搜索
DECLARE @tbl TABLE(Logbook1 INT,Logbook2 INT,Logbook3 INT);
INSERT INTO @tbl VALUES
(12345,23456,56789)
,(234,NULL,NULL)
,(NULL,123,NULL)
,(NULL,NULL,NULL);
SELECT 'logbBookNums IN(' + NumList.Concatenated +')'
FROM @tbl
CROSS APPLY
(
SELECT STUFF
(
(
SELECT ',' + CAST(LogbookX AS VARCHAR(100))
FROM
(
VALUES(Logbook1),(Logbook2),(Logbook3)
) AS x(LogbookX)
FOR XML PATH('')
),1,1,'')
)AS NumList(Concatenated)
WHERE NumList.Concatenated IS NOT NULL
结果
logbBookNums IN(12345,23456,56789)
logbBookNums IN(234)
logbBookNums IN(123)
那你可以写成Case When结构，没那么长：
CASE WHEN Logbook1 is not null
THEN
CASE WHEN Logbook2 is not null
THEN
CASE WHEN Logbook2 is not null
THEN Logbook1+','+Logbook2+','+Logbook3
ELSE Logbook1+','+Logbook2
ELSE
CASE WHEN Logbook3 is not null
THEN Logbook1+','+Logbook3
ELSE Logbook1
ELSE CASE WHEN ...
考虑下面的 SQL 查询，该查询旨在以 XML 的形式构建复杂的 return:
ISNULL(Logbook1 + ',', '') + ISNULL(Logbook2 + ',', '') + ISNULL(Logbook3 + ',', '') AS '@logBookNums',
本质上，这将搜索适当的记录。如果它发现 LogBook1、LogBook2 或 LogBook3 不存在记录，它将 return 一个空字符串。如果它在 LogBook1 中找到一条记录，它将 return 和一个尾随逗号。
不幸的是，这个 XML 发送到的 WCF 服务的记录令人震惊（实际上是 none 无论如何）并且它拒绝带有尾随逗号的单个日志编号。
我的猜测是它应该提交为：
logBookNums="12345,,"
或
logBookNums="12345"
我应该如何更改上面的 SQL 行以输出一个或另一个，并且（如果查询找到两个日志编号）生成如下输出：
logBookNums="12345,12346,"
或
logBookNums="12345,12346"
这是整个查询，我需要插入一个解决方案来处理@logBookNums 和@landingDecNums 的这种困境。
CREATE PROCEDURE dbo.CreateErsSalesAddSubmissionXmlByDateRange
-- Add the parameters for the stored procedure here
@uname VARCHAR(10) ,
@pword VARCHAR(10) ,
@sntype VARCHAR(1) ,
@action VARCHAR(10) ,
@salesContractRef VARCHAR(10),
@auctionId NCHAR(10) ,
@startDate DATE,
@endDate DATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT
RTRIM(@uname) AS '@uname',
RTRIM(@pword) AS '@pword',
(SELECT
@snType AS '@snType',
RTRIM(@action) AS '@action',
COALESCE(@salesContractRef, '') AS '@salesContractRef',
CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate',
RTRIM(COALESCE(@auctionID, '')) AS '@auctionID',
ISNULL(Logbook1 + ',', '') + ISNULL(Logbook2 + ',', '') + ISNULL(Logbook3 + ',', '') AS '@logBookNums',
ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums',
COALESCE(VesselName, '') AS '@vesselName',
RTRIM(VesselPLN) AS '@vesselPln',
RTRIM(VesselOwner) AS '@vesselMasterOwner',
COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1',
COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2',
COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3',
RTRIM(CountryOfLanding) AS '@countryOfLanding',
RTRIM(PortOfLanding) AS '@landingPortCode',
RTRIM(lh1.LandingId) AS '@internalRef',
(SELECT
COALESCE(RTRIM(SpeciesCode),'') AS '@speciesCode',
RTRIM(FishingArea) AS '@faoAreaCode',
COALESCE(RTRIM(IcesZone),'') AS '@ZoneCode',
COALESCE(RTRIM(ld.DisposalCode),'') AS '@disposalCode',
COALESCE(ld.FreshnessGrade,'') AS '@freshnessCode',
COALESCE(ld.ProductSize,'') AS '@sizeCode',
COALESCE(ld.PresentationCode,'') AS '@presentationCode',
COALESCE(ld.PresentationState,'') AS '@stateCode',
RTRIM(ld.NumberOfFish) AS '@numberOfFish',
FORMAT(ld.Quantity, 'N2') AS '@weightKgs',
FORMAT(Quantity * ld.UnitPrice, 'N2') AS '@value',
COALESCE(ld.Currency,'') AS '@currencyCode',
RTRIM(ld.WithdrawnDestinationCode) AS '@withdrawnDestinationCode',
RTRIM(ld.BuyersRegistrationCode) AS '@buyerReg',
RTRIM(ld.SalesContractRef) AS '@salesContractRef'
FROM LandingDetails ld
JOIN LandingHeaders lh
ON ld.LandingId = lh.LandingId
WHERE ld.LandingId = lh1.LandingId
FOR XML PATH ('salesline'), TYPE)
FROM LandingHeaders lh1
WHERE lh1.AllocatedErsId IS NULL AND lh1.LandingDate1 BETWEEN @startDate AND @endDate
ORDER BY VesselName,lh1.LandingId
FOR XML PATH ('salesnote'), TYPE)
FOR XML PATH ('ers')
END
GO
编辑（我在下面的回答中尝试过）
SELECT
RTRIM(@uname) AS '@uname'
,RTRIM(@pword) AS '@pword'
,(SELECT
@snType AS '@snType'
,RTRIM(@action) AS '@action'
,COALESCE(@salesContractRef, '') AS '@salesContractRef'
,CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate'
,RTRIM(COALESCE(@auctionID, '')) AS '@auctionID'
,(
SELECT ',' + CAST(LogbookX AS VARCHAR(100))
FROM
(
VALUES(Logbook1),(Logbook2),(Logbook3)
) AS x(LogbookX)
FOR XML PATH('')
),1,1,'')
AS NumList(Concatenated)
WHERE NumList.Concatenated IS NOT NULL AS '@logBookNums'
,ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums'
,COALESCE(VesselName, '') AS '@vesselName'
,RTRIM(VesselPLN) AS '@vesselPln'
,RTRIM(VesselOwner) AS '@vesselMasterOwner'
,COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1'
,COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2'
,COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3'
,RTRIM(CountryOfLanding) AS '@countryOfLanding'
,RTRIM(PortOfLanding) AS '@landingPortCode'
,RTRIM(lh1.LandingId) AS '@internalRef'
额外编辑以帮助澄清下面答案中的评论
完整修改后的查询现在如下所示：
CREATE PROCEDURE dbo.CreateErsSalesAddSubmissionXmlByDateRange
-- Add the parameters for the stored procedure here
@uname VARCHAR(10),
@pword VARCHAR(10),
@sntype VARCHAR(1),
@action VARCHAR(10),
@salesContractRef VARCHAR(10),
@auctionId NCHAR(10),
@startDate DATE,
@endDate DATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
SELECT
RTRIM(@uname) AS '@uname'
,RTRIM(@pword) AS '@pword'
,(SELECT
@snType AS '@snType'
,RTRIM(@action) AS '@action'
,COALESCE(@salesContractRef, '') AS '@salesContractRef'
,CONVERT(VARCHAR(10), DateOfPurchase, 112) AS '@saleDate'
,RTRIM(COALESCE(@auctionID, '')) AS '@auctionID'
,STUFF
((SELECT
',' + CAST(LogbookX AS VARCHAR(100))
FROM (
VALUES (Logbook1), (Logbook2), (Logbook3)
) AS x (LogbookX)
FOR XML PATH (''))
, 1, 1, '')
AS '@logBookNums'
,ISNULL(LandingDecNumber1 + ',', '') + ISNULL(LandingDecNumber2 + ',', '') + ISNULL(LandingDecNumber3 + ',', '') AS '@landingDecNums'
,COALESCE(VesselName, '') AS '@vesselName'
,RTRIM(VesselPLN) AS '@vesselPln'
,RTRIM(VesselOwner) AS '@vesselMasterOwner'
,COALESCE(CONVERT(VARCHAR(10), LandingDate1, 112), '') AS '@landingDate1'
,COALESCE(CONVERT(VARCHAR(10), LandingDate2, 112), '') AS '@landingDate2'
,COALESCE(CONVERT(VARCHAR(10), LandingDate3, 112), '') AS '@landingDate3'
,RTRIM(CountryOfLanding) AS '@countryOfLanding'
,RTRIM(PortOfLanding) AS '@landingPortCode'
,RTRIM(lh1.LandingId) AS '@internalRef'
,(SELECT
COALESCE(RTRIM(SpeciesCode), '') AS '@speciesCode'
,RTRIM(FishingArea) AS '@faoAreaCode'
,COALESCE(RTRIM(IcesZone), '') AS '@ZoneCode'
,COALESCE(RTRIM(ld.DisposalCode), '') AS '@disposalCode'
,COALESCE(ld.FreshnessGrade, '') AS '@freshnessCode'
,COALESCE(ld.ProductSize, '') AS '@sizeCode'
,COALESCE(ld.PresentationCode, '') AS '@presentationCode'
,COALESCE(ld.PresentationState, '') AS '@stateCode'
,RTRIM(ld.NumberOfFish) AS '@numberOfFish'
,FORMAT(ld.Quantity, 'N2') AS '@weightKgs'
,FORMAT(Quantity * ld.UnitPrice, 'N2') AS '@value'
,COALESCE(ld.Currency, '') AS '@currencyCode'
,RTRIM(ld.WithdrawnDestinationCode) AS '@withdrawnDestinationCode'
,RTRIM(ld.BuyersRegistrationCode) AS '@buyerReg'
,RTRIM(ld.SalesContractRef) AS '@salesContractRef'
FROM LandingDetails ld
JOIN LandingHeaders lh
ON ld.LandingId = lh.LandingId
WHERE ld.LandingId = lh1.LandingId
FOR XML PATH ('salesline'), TYPE)
FROM LandingHeaders lh1
WHERE lh1.AllocatedErsId IS NULL
AND lh1.LandingDate1 BETWEEN @startDate AND @endDate
ORDER BY VesselName, lh1.LandingId
FOR XML PATH ('salesnote'), TYPE)
FOR XML PATH ('ers')
END
GO
当有 logBookNums 时，我们的格式就会正确 xml，如下所示。
然而，如果没有，我们应该得到 logBookNums=""，但如您所见，我们什么也得不到。
你可以这样试试
您需要 "IN" 搜索，没有像 aNumber='123,345,678'
DECLARE @tbl TABLE(Logbook1 INT,Logbook2 INT,Logbook3 INT);
INSERT INTO @tbl VALUES
(12345,23456,56789)
,(234,NULL,NULL)
,(NULL,123,NULL)
,(NULL,NULL,NULL);
SELECT 'logbBookNums IN(' + NumList.Concatenated +')'
FROM @tbl
CROSS APPLY
(
SELECT STUFF
(
(
SELECT ',' + CAST(LogbookX AS VARCHAR(100))
FROM
(
VALUES(Logbook1),(Logbook2),(Logbook3)
) AS x(LogbookX)
FOR XML PATH('')
),1,1,'')
)AS NumList(Concatenated)
WHERE NumList.Concatenated IS NOT NULL
结果
logbBookNums IN(12345,23456,56789)
logbBookNums IN(234)
logbBookNums IN(123)
那你可以写成Case When结构，没那么长：
CASE WHEN Logbook1 is not null
THEN
CASE WHEN Logbook2 is not null
THEN
CASE WHEN Logbook2 is not null
THEN Logbook1+','+Logbook2+','+Logbook3
ELSE Logbook1+','+Logbook2
ELSE
CASE WHEN Logbook3 is not null
THEN Logbook1+','+Logbook3
ELSE Logbook1
ELSE CASE WHEN ...