XSLT 2.0 分组、求和、计数和条件

Question

我有 XSLT，它正在对输入进行分组，对当前组求和，并且仅在总和满足特定条件时才输出记录。 for-each-group 工作正常，但我无法获得尾部记录的准确记录数。

这是一个示例输入：

<Book_Data>
  <Book_Entry>
    <Book>
      <Book_ID>1</Book_ID>
      <Book_Name>Test1</Book_Name>
    </Book>
    <Sales>
      <Quantity>2</Quantity>
    </Sales>
  <Book_Entry>
  <Book_Entry>
    <Book>
      <Book_ID>1</Book_ID>
      <Book_Name>Test1</Book_Name>
    </Book>
    <Sales>
      <Quantity>3</Quantity>
    </Sales>
  <Book_Entry>
  <Book_Entry>
    <Book>
      <Book_ID>2</Book_ID>
      <Book_Name>Test2</Book_Name>
    </Book>
    <Sales>
      <Quantity>3</Quantity>
    </Sales>
  <Book_Entry>
  <Book_Entry>
    <Book>
      <Book_ID>2</Book_ID>
      <Book_Name>Test2</Book_Name>
    </Book>
    <Sales>
      <Quantity>-3</Quantity>
    </Sales>
  <Book_Entry>
</Book_Data>

这是一个示例 XSLT (2.0)：

<xsl:for-each-group select="Book_Data/Book_Entry" group-by="Book/Book_ID">
        <xsl:if test="sum(current-group()/Sales/Quantity) != 0">
            <xsl:value-of select="Book/Book_ID"/>
            <xsl:value-of select="Book/Book_Name"/>
        </xsl:if>
</xsl:for-each-group>

<xsl:value-of select="count(distinct-values(Book_Data/Book_Entry/Book/Book_ID[sum(../../Sales/Quantity) != 0]))"/>

问题是顶部部分仅正确输出第 1 本书。但预告片计算了两本书，我不知道如何调整总和以在外部上下文中引用 Book_ID。

Answer 1

您可以将 for-each-group 的结果输出存储在一个变量中，然后对组进行计数，如果我理解您想要什么的话：

    <xsl:variable name="groups" as="xs:string*">
        <xsl:for-each-group select="Book_Data/Book_Entry" group-by="Book/Book_ID">
            <xsl:if test="sum(current-group()/Sales/Quantity) != 0">
                <xsl:sequence select="current-grouping-key()"/>
            </xsl:if>
        </xsl:for-each-group>          
    </xsl:variable>

    <xsl:value-of select="$groups"/>
    <xsl:value-of select="count($groups)"/>

XSLT 2.0 分组、求和、计数和条件

XSLT 2.0 Grouping, Summing, Counting and Conditions

xml

xslt

xslt-2.0