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[英]How to delete nodes containing multiple attributes from XML variable in SQL
[英]How to create XML nodes with attributes from Table
我有以下示例表
在这里编码
CREATE TABLE XMLData
(
NodeName NVARCHAR(255),
AttributA NVARCHAR(255),
AttributB NVARCHAR(255),
AttributC NVARCHAR(255),
)
INSERT INTO XMLData VALUES
('RowA','','abcd','efgh'),
('RowB','wxyz',NULL,NULL),
('RowC',NULL,'qwer','tyui'),
('RowD','stuv','erty','fghj')
SELECT * FROM dbo.XMLData
如何获得XML?
<NodeA>
<NodeB />
<NodeC AttributeX="">
<RowA AttributeA="" AttributeB="abcd" AttributeC="efgh" />
<RowB AttributeA="wxyz" />
<RowC AttributeB="qwer" AttributeC="tyui" />
<RowD AttributeA="stuv" AttributeB="erty" AttributeC="fghj" />
</NodeC>
</NodeA>
我是XML的初学者,但我尝试使用这种方法
SELECT
(
SELECT
(
SELECT '' AS '@AttributeX' FOR XML PATH('NodeC'),TYPE
-- How to get table rows here ?
)
FOR XML PATH('NodeB'),TYPE -- Here it creates additional end NodeB tag
)
FOR XML PATH('NodeA'),TYPE
这几乎是您想要的。 如我的评论所述,您将无法动态创建元素的名称( <RowA>
等)。 为此,您必须使用动态SQL,并且我认为这实际上不是您想要的...
这是我的建议:
SELECT '' AS [NodeB]
,'' AS [NodeC/@AttributeX]
,(
SELECT x.NodeName AS [@NodeName]
,x.AttributA AS [@AttributeA]
,x.AttributB AS [@AttributeB]
,x.AttributC AS [@AttributeC]
FROM XMLData AS x
FOR XML PATH('Row'),TYPE
) AS NodeC
FOR XML PATH(''),ROOT('NodeA')
结果
<NodeA>
<NodeB></NodeB>
<NodeC AttributeX="">
<Row NodeName="RowA" AttributeA="" AttributeB="abcd" AttributeC="efgh" />
<Row NodeName="RowB" AttributeA="wxyz" />
<Row NodeName="RowC" AttributeB="qwer" AttributeC="tyui" />
<Row NodeName="RowD" AttributeA="stuv" AttributeB="erty" AttributeC="fghj" />
</NodeC>
</NodeA>
这是一个XSLT,用于从上面的XML中获取“动态”元素名称
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes" />
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*[@NodeName]">
<xsl:element name="{@NodeName}">
<xsl:apply-templates select="@*|node()"/>
</xsl:element>
</xsl:template>
<xsl:template match="@NodeName" />
</xsl:stylesheet>
这就是结果在这里测试
<NodeA>
<NodeB/>
<NodeC AttributeX="">
<RowA AttributeA="" AttributeB="abcd" AttributeC="efgh"/>
<RowB AttributeA="wxyz"/>
<RowC AttributeB="qwer" AttributeC="tyui"/>
<RowD AttributeA="stuv" AttributeB="erty" AttributeC="fghj"/>
</NodeC>
</NodeA>
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