[英]Returning all child nodes as columns from XML in Sql Server
我正在執行以下操作以從XML字符串中選擇節點,第一部分只是向您展示我要選擇的內容。
問題是我想對各種不同的XML列執行此操作,並且我不想在我的選擇中為每個列指定節點名,有沒有一種方法可以自動選擇所有節點作為列,甚至可以使用count選擇一個游標?
DECLARE @MyXML XML
SET @MyXML = (SELECT
CAST (
'<AllowAdd>N</AllowAdd>
<Allowed>NUMSEG</Allowed>
<AllSegmentsEqualValue>N</AllSegmentsEqualValue>
<ClusterLevelSA>Y</ClusterLevelSA>
<ClusterLevelPremium>Y</ClusterLevelPremium>
<AllowAssignedAndInTrust>N</AllowAssignedAndInTrust>
<MinSegments>1</MinSegments>
<MaxSegments>100</MaxSegments>
<DefaultSegments>10</DefaultSegments>
<RoundPremiumsTo>2</RoundPremiumsTo>
<TaxDeferredAllowance>0.05</TaxDeferredAllowance>
<HigherTaxValueBands>HTVB</HigherTaxValueBands>
<NumberYearsCalculationType>NONFIN</NumberYearsCalculationType>
<OnShore>POLICY</OnShore>
<OffShore>NONFIN</OffShore>'as XML) as x)
SELECT
Data.Col.value('(/AllowAdd)[1]','Varchar(10)') as [Allow Addition of]
,Data.Col.value('(/Allowed)[1]','Varchar(10)') as [Allowed]
,Data.Col.value('(/MinSegments)[1]','Int') as [Min Segments]
,Data.Col.value('(/MaxSegments)[1]','Int') as [Max Segments]
,Data.Col.value('(/DefaultSegments)[1]','Int') as [Default Segments]
,Data.Col.value('(/RoundPremiumsTo)[1]','Int') as [Round Premiums To]
,Data.Col.value('(/AllSegmentsEqualValue)[1]','Varchar(10)') as [All Segments Equal Value]
--,Data.Col.value('(/TaxDeferredAllowance)[1]','Varchar(10)') as [Tax Deferred Allowance]
,Data.Col.value('(/HigherTaxValueBands)[1]','Varchar(10)') as [Higher Tax Value Bands]
,Data.Col.value('(/NumberYearsCalculationType)[1]','Varchar(10)') as [Number Years Calculation Type]
,Data.Col.value('(/OnShore)[1]','Varchar(10)') as [OnShore]
,Data.Col.value('(/OffShore)[1]','Varchar(10)') as [OffShore]
FROM @MyXML.nodes('/OffShore') AS Data(Col)
我希望,這就是您在等待的內容:)
DECLARE @MyXML XML
SET @MyXML = (SELECT
CAST (
'<AllowAdd>N</AllowAdd>
<Allowed>NUMSEG</Allowed>
<AllSegmentsEqualValue>N</AllSegmentsEqualValue>
<ClusterLevelSA>Y</ClusterLevelSA>
<ClusterLevelPremium>Y</ClusterLevelPremium>
<AllowAssignedAndInTrust>N</AllowAssignedAndInTrust>
<MinSegments>1</MinSegments>
<MaxSegments>100</MaxSegments>
<DefaultSegments>10</DefaultSegments>
<RoundPremiumsTo>2</RoundPremiumsTo>
<TaxDeferredAllowance>0.05</TaxDeferredAllowance>
<HigherTaxValueBands>HTVB</HigherTaxValueBands>
<NumberYearsCalculationType>NONFIN</NumberYearsCalculationType>
<OnShore>POLICY</OnShore>
<OffShore>NONFIN</OffShore>'as XML) as x)
DECLARE @Output nvarchar(max) = N''
DECLARE @PivotList nvarchar(max)
SELECT
@PivotList = COALESCE(@PivotList + ', ', N'') + N'[' + XC.value('local-name(.)', 'varchar(100)') + N']'
FROM
@MyXML.nodes('/*') AS XT(XC)
SET @Output = N'SELECT
'+@PivotList+N'
FROM
(
SELECT
ColName = XC.value(''local-name(.)'', ''nvarchar(100)''),
ColValue = ISNULL(NULLIF(CONVERT(nvarchar(max),XC.query(''./*'')),''''),XC.value(''.'',''nvarchar(max)''))
FROM
@MyXML.nodes(''/*'') AS XT(XC)
) AS s
PIVOT
(
MAX(ColValue)
FOR ColName IN ('+@PivotList+N')
) AS t;'
EXEC sp_executesql @Output, N'@MyXml xml', @MyXML = @MyXML;
使用游標構建SELECT語句,然后使用sp_executesql執行該語句!
DECLARE @MyXML XML
DECLARE @FieldName VARCHAR(MAX)
DECLARE @SELECT_TEXT NVARCHAR(MAX)
SET @MyXML = (SELECT
CAST (
'<AllowAdd>N</AllowAdd>
<Allowed>NUMSEG</Allowed>
<AllSegmentsEqualValue>N</AllSegmentsEqualValue>
<ClusterLevelSA>Y</ClusterLevelSA>
<ClusterLevelPremium>Y</ClusterLevelPremium>
<AllowAssignedAndInTrust>N</AllowAssignedAndInTrust>
<MinSegments>1</MinSegments>
<MaxSegments>100</MaxSegments>
<DefaultSegments>10</DefaultSegments>
<RoundPremiumsTo>2</RoundPremiumsTo>
<TaxDeferredAllowance>0.05</TaxDeferredAllowance>
<HigherTaxValueBands>HTVB</HigherTaxValueBands>
<NumberYearsCalculationType>NONFIN</NumberYearsCalculationType>
<OnShore>POLICY</OnShore>
<OffShore>NONFIN</OffShore>
'
as XML) as x)
SET @SELECT_TEXT = 'SELECT '
DECLARE xml_cursor CURSOR
FOR SELECT Data.Col.value( 'fn:local-name(.)', 'VARCHAR(MAX)' ) FROM @MyXML.nodes('/*') AS Data(Col)
open xml_cursor
While 1 = 1
BEGIN
fetch next from xml_cursor into @FieldName
if @@fetch_status <> 0
begin
break
end
SET @SELECT_TEXT = @SELECT_TEXT + 'Data.Col.value(''(/' + @FieldName + ')[1]'',''Varchar(MAX)'') as [' + @FieldName + ']' + ', '
END
close xml_cursor
deallocate xml_cursor
SET @SELECT_TEXT = SUBSTRING( @SELECT_TEXT,0, LEN(@SELECT_TEXT) ) + 'FROM @MyXML.nodes(''/OffShore'') AS Data(Col)'
EXECUTE sp_executesql @SELECT_TEXT, N'@MyXML XML', @MyXML = @MyXML
正如前面在另一條評論中提到的,缺點是沒有列類型,但是它是用於報表樣式查詢的,因此字符串可以。
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