select distinct values : select « XSLT stylesheet « XML






select distinct values


File: Data.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<booklist>
   <book>
      <title>title 1</title>
      <author>author 1</author>
      <publisher>publisher 1</publisher>
      <isbn>1-11-11111-1</isbn>
      <price>6.99</price>
      <sales>235</sales>
   </book>
   <book>
      <title>title 2</title>
      <author>author 2</author>
      <publisher>publisher 2</publisher>
      <isbn>0 14 018967 X</isbn>
      <price>12.99</price>
      <sales>12</sales>
   </book>
</booklist>


File: Transform.xslt

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="xs" version="2.0">

  <xsl:key name="pub" match="book" use="publisher" />

  <xsl:variable name="in" select="/" />

  <xsl:variable name="publishers" as="xs:string*"
    select="distinct-values(/booklist/book/publisher)" />

  <xsl:template match="/">
    <html>
      <head>
        <title>Sales volume by publisher</title>
      </head>
      <body>
        <h1>Sales volume by publisher</h1>
        <table id="{generate-id(.)}">
          <tr>
            <th>Publisher</th>
            <th>Total Sales Value</th>
          </tr>
          <xsl:for-each select="$publishers">
            <tr>
              <td>
                <xsl:value-of select="." />
              </td>
              <td>
                <xsl:call-template name="total-sales" />
              </td>
            </tr>
          </xsl:for-each>
        </table>
      </body>
    </html>
  </xsl:template>

  <xsl:template name="total-sales">
    <xsl:param name="publisher" select="." />
    <xsl:value-of select="sum($in/key('pub',$publisher)/sales)" />
  </xsl:template>
</xsl:stylesheet>

Output:

<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Sales volume by publisher</title>
   </head>
   <body>
      <h1>Sales volume by publisher</h1>
      <table id="d2">
         <tr>
            <th>Publisher</th>
            <th>Total Sales Value</th>
         </tr>
         <tr>
            <td>publisher 1</td>
            <td>235</td>
         </tr>
         <tr>
            <td>publisher 2</td>
            <td>12</td>
         </tr>
      </table>
   </body>
</html>

 








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