XSLT 2.0 - 使用密钥的不同值

时间:2014-06-18 08:30:55

标签: xml xslt xslt-2.0 xslkey

我在XSLT表上遇到了一些麻烦。这是我的XML文档:

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <products>
    <product>
      <id>1</id>
    </product>
  </products>
  <stocks>
    <stock>
      <id>1</id>
      <size>S</size>
      <store>NYC</store>
    </stock>
    <stock>
      <id>1</id>
      <size>L</size>
      <store>NYC</store>
    </stock>
    <stock>
      <id>1</id>
      <size>S</size>
      <store>LA</store>
    </stock>
  </stocks>
</catalog>

我想要的是拥有这种输出XML:

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <products>
    <product>
      <id>1</id>
      <variants>
        <variant>
          <size>S</size>
          <stocks>
            <stock store-ref="NYC">
            <stock store-ref="LA">
          </stocks>
        <variant>
        <variant>
          <size>L</size>
          <stocks>
            <stock store-ref="NYC">
          </stocks>
        <variant>
      </variants>
    </product>
  </products>
</catalog> 

今天,我正在使用这个XSLT来执行这种转换:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" exclude-result-prefixes="xs fn" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions">
  <xsl:key name="sizes" match="stock" use="id"/>
  <xsl:key name="stocks" match="stock" use="fn:concat(id, '-', size)"/>
  <xsl:output method="xml" encoding="UTF-8" indent="yes"/>
  <xsl:template match="/">
    <catalog>
      <products>
        <xsl:for-each select="/catalog/products/product">
          <product>
            <id><xsl:value-of select="id" /></id>
            <variants>
              <xsl:for-each select="key('sizes', id)">
                <variant>
                  <size><xsl:value-of select="size" /></size>
                  <stocks>
                    <xsl:for-each select="key('stocks', fn:concat(id, '-', size))">
                      <stock store-ref="{store}" />
                    </xsl:for-each>
                  </stocks>
                </variant>
              </xsl:for-each>
            </variants>
          </product>
        </xsl:for-each>
      </products>
    </catalog>
  </xsl:template>
</xsl:stylesheet>

我得到了这个结果:

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
   <products>
      <product>
         <id>1</id>
         <variants>
            <variant>
               <size>S</size>
               <stocks>
                  <stock store-ref="NYC"/>
                  <stock store-ref="LA"/>
               </stocks>
            </variant>
            <variant>
               <size>L</size>
               <stocks>
                  <stock store-ref="NYC"/>
               </stocks>
            </variant>
            <variant>
               <size>S</size>
               <stocks>
                  <stock store-ref="NYC"/>
                  <stock store-ref="LA"/>
               </stocks>
            </variant>
         </variants>
      </product>
   </products>
</catalog>

所以我的问题是我想选择不同的大小值,但它似乎不起作用。我已经尝试使用generate-id(),但我真的不明白它是如何工作的所以我没有得到很好的结果:( 知道如何解决这个问题吗? 谢谢!

2 个答案:

答案 0 :(得分:2)

感谢@Tomalak,我找到了解决方案。这是我正在使用的XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" exclude-result-prefixes="xs fn" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions">
  <xsl:key name="sizes" match="stock" use="id"/>
  <xsl:key name="stocks" match="stock" use="fn:concat(id, '-', size)"/>
  <xsl:output method="xml" encoding="UTF-8" indent="yes"/>
  <xsl:template match="/">
    <catalog>
      <products>
        <xsl:for-each select="/catalog/products/product">
          <product>
            <id><xsl:value-of select="id" /></id>
            <variants>
              <xsl:for-each-group select="key('sizes', id)" group-by="size">
                <variant>
                  <size><xsl:value-of select="size" /></size>
                  <stocks>
                    <xsl:for-each select="key('stocks', fn:concat(id, '-', size))">
                      <stock store-ref="{store}" />
                    </xsl:for-each>
                  </stocks>
                </variant>
              </xsl:for-each-group>
            </variants>
          </product>
        </xsl:for-each>
      </products>
    </catalog>
  </xsl:template>
</xsl:stylesheet>

答案 1 :(得分:0)

除了您自己找到的解决方案之外,我还想向您展示多级分组。

为方便起见,您只需要一个密钥:

<xsl:key name="kStock" match="stock" use="id"/>

和此:

<xsl:template match="product">
  <xsl:copy>
    <xsl:copy-of select="id" />
    <variants>
      <xsl:for-each-group select="key('kStock', id)" group-by="size">
        <variant>
          <xsl:copy-of select="size" />
          <stocks>
            <xsl:for-each-group select="current-group()" group-by="store">
              <stock store-ref="{current-grouping-key()}" />
            </xsl:for-each-group>
          </stocks>
        </variant>
      </xsl:for-each-group>
    </variants>
  </xsl:copy>
</xsl:template>

请注意使用current-group()current-grouping-key()