使用XSLT 2.0基于元素值和属性对XML元素进行分组

Question

我想通过XML元素通过一个公共元素值对数据进行分组。 输入XML结构为：

<?xml version="1.0" encoding="utf-8"?> 
<Data> 
<output outputType="CORRECTION"> 
    <row nodeName="ORDER_HEADER" tableName="ORDER_HEADER"> 
     <column columnName="ORDER_NUMBER">00001</column> 
     <column columnName="Country">England</column> 
     <column columnName="City">London</column> 
    </row> 
    <row nodeName="ORDER_HEADER" tableName="ORDER_HEADER"> 
     <column columnName="ORDER_NUMBER">00002</column> 
     <column columnName="Country">England</column> 
     <column columnName="City">Birmingham</column> 
    </row> 
    <row nodeName="ORDER_DETAIL" tableName="ORDER_DETAIL"> 
     <column columnName="ORDER_NUMBER">00001</column> 
     <column columnName="Book">Gone with the wind</column> 
     <column columnName="Qty">2</column> 
    </row> 
    <row nodeName="ORDER_DETAIL" tableName="ORDER_DETAIL"> 
     <column columnName="ORDER_NUMBER">00001</column> 
     <column columnName="Book">Pride and Prejudice</column> 
     <column columnName="Qty">3</column> 
    </row> 
    <row nodeName="ORDER_DETAIL" tableName="ORDER_DETAIL"> 
     <column columnName="ORDER_NUMBER">00002</column> 
     <column columnName="Book">Jane Eyre</column> 
     <column columnName="Qty">1</column> 
    </row> 
</output> 
</Data> 

我试图创建以下的输出：

<Transmission xmlns:xs="http://www.w3.org/2001/XMLSchema" 
      xmlns="http://www.w3.org/1999/xhtml"> 
    <OrderNumber>00001</OrderNumber> 
    <Country>England</Country> 
    <City>London</CITY> 
    <Book>Gone with the wind</Book> 
    <QTY>2</QTY> 
    <Book>Pride and Prejudice</Book> 
    <QTY>3</QTY> 
    <OrderNumber>00002</OrderNumber> 
    <Country>England</Country> 
    <City>Birmingham</CITY> 
    <Book>Jane Eyre</Book> 
    <QTY>1</QTY> 
</Transmission> 

这里是XSL我到目前为止：

<?xml version="1.0" encoding="utf-8"?> 
<xsl:stylesheet version="2.0"  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.w3.org/1999/xhtml"> 
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/> 
<xsl:template match="/Data/output[@outputType='CORRECTION']"> 
    <Transmission> 
     <xsl:for-each select="row[@tableName='ORDER_HEADER']"> 
      <OrderNumber> 
       <xsl:value-of select="column[@columnName='ORDER_NUMBER']" /> 
      </OrderNumber> 
      <Country> 
       <xsl:value-of select="column[@columnName='Country']" /> 
      </Country> 
      <City> 
       <xsl:value-of select="column[@columnName='City']" /> 
      </City> 
     </xsl:for-each> 
    </Transmission> 
</xsl:template> 
</xsl:stylesheet> 

我可以输出来自每个订单表头的详细信息，但无法看到如何选择和分组正确的订单详细信息。任何帮助将非常感激。

感谢

Answer 1

您可以使用一键查询订单详情

<xsl:key name="detail" match="row[@nodeName='ORDER_DETAIL']" use="column[@columnName='ORDER_NUMBER']" /> 

（在XSLT 1.0和XSLT 2.0其中工程）然后，为了获得订单细节对于给定的顺序号，您可以使用键像这样：

<xsl:for-each select="key('detail', column[@columnName='ORDER_NUMBER'])"> 

试试这个XSLT

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> 
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/> 
<xsl:key name="detail" match="row[@nodeName='ORDER_DETAIL']" use="column[@columnName='ORDER_NUMBER']" /> 
<xsl:template match="/Data/output[@outputType='CORRECTION']"> 
    <Transmission> 
     <xsl:for-each select="row[@tableName='ORDER_HEADER']"> 
      <xsl:variable name="orderNumber" select="column[@columnName='ORDER_NUMBER']" /> 
      <OrderNumber> 
       <xsl:value-of select="$orderNumber" /> 
      </OrderNumber> 
      <Country> 
       <xsl:value-of select="column[@columnName='Country']" /> 
      </Country> 
      <City> 
       <xsl:value-of select="column[@columnName='City']" /> 
      </City> 
      <xsl:apply-templates select="key('detail', $orderNumber)" /> 
     </xsl:for-each> 
    </Transmission> 
</xsl:template> 

<xsl:template match="row"> 
    <Book> 
     <xsl:value-of select="column[@columnName='Book']" /> 
    </Book> 
    <QTY> 
     <xsl:value-of select="column[@columnName='Qty']" /> 
    </QTY> 
</xsl:template> 
</xsl:stylesheet> 

请注意，我改用xsl:apply-templates代替，只是为了削减太多的嵌套代码。我还使用了一个变量，以避免重复获取订单号。

顺便说一句，这真的是你想要的XML输出吗？将每个订单包装在一个包含父元素的内容中可能更合乎逻辑，否则，为订单提取书籍会变得更加困难。

<Transmission> 
<Order> 
    <OrderNumber>00001</OrderNumber> 
    <Country>England</Country> 
    <City>London</City> 
    <Book>Gone with the wind</Book> 
    <QTY>2</QTY> 
    <Book>Pride and Prejudice</Book> 
    <QTY>3</QTY> 
</Order> 
<Order> 
    <OrderNumber>00002</OrderNumber> 
    <Country>England</Country> 
    <City>Birmingham</City> 
    <Book>Jane Eyre</Book> 
    <QTY>1</QTY> 
</Order> 
</Transmission>