xsl: looking for something like left join

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Hi I'm fighting with xpath... I try do do something like a 'SQL-JOIN', but without any success. I have an xml doc with master/detail relation 1:1. The xsl below shows me all masters, but accessing its detail does not work (third column). N.B: I'm an absolute beginner with xsl and xpath.

Thanks for help

Really, nobody an idea?

XML

<?xml version="1.0" encoding="ISO-8859-1"?>

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
  <html>
  <body>

  <table border="1">
    <tr bgcolor="#9acd32">
      <th>Master ID</th>
      <th>Master Name</th>
      <th>Detail</th>
    </tr>
    <xsl:for-each select="Export/Master">
    <tr>
      <td><xsl:value-of select="MASTER_ID"/></td>
      <td><xsl:value-of select="MASTER_NAME"/></td>
      <!--The following is the problem...-->   
      <td><xsl:value-of select="/Export/Detail/DETAIL_DATA[/Export/Detail/MASTER_ID = MASTER_ID]"/></td>
    </tr>
    </xsl:for-each>
  </table>
  </body>
  </html>
</xsl:template>

</xsl:stylesheet>

xml example data:

XML

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<?xml-stylesheet type="text/xsl" href="dcical.XSL"?>
<Export>
  <Master>
    <MASTER_ID>ID1</MASTER_ID>
    <MASTER_NAME>Name 1</MASTER_NAME>
  </Master>
  <Master>
    <MASTER_ID>ID2</MASTER_ID>
    <MASTER_NAME>Name 2</MASTER_NAME>
  </Master>
  <Detail>
    <MASTER_ID>ID1</MASTER_ID>
    <DETAIL_DATA>Detail of of master 1</DETAIL_DATA>
  </Detail>
</Export>
<!-- Integrity= "57687a72" -->

Posted 28-May-12 3:51am

idle63

Updated 28-May-12 12:58pm

v8

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Comments

[no name] 28-May-12 17:06pm

Really, nobody an idea? Or is maybe my question probably a little bit abstract ...to short... not clear?

Andreas Gieriet 28-May-12 18:08pm

What is the data?
What is the problem? E.g. no data in the table or crap or XSLT error, or ...?
Make it easy for the rest of the world to reproduce your problem. Or shall I invent the data myself? Give all you have, destilled to the relevant parts and ask for advise.

Cheers
Andi

[no name] 28-May-12 18:43pm

Danke, Du hast recht. ich werde gleich mal auch die Daten posten ;)
No erros, simply no data in the third column.

2 solutions

Solution 1

Maybe this is what you aim for:

XML

<xsl:for-each select="Export/Master">
  <xsl:variable name="masterid" select="MASTER_ID"/>
  ...
  <td>
     <xsl:value-of select="/Export/Detail[MASTER_ID=$masterid]/DETAIL_DATA"/>
  </td>
  ...

Cheers
Andi

Posted 28-May-12 12:19pm

Andreas Gieriet

Comments

[no name] 28-May-12 18:55pm

sorry, does also not work...but keep in mind I'm the absolute beginner with this xpath stuff. maybe I try something which is not possible..

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Andreas Gieriet · Accepted Answer · 2012-05-28T15:48:00

After you posted the data: this works for me.

XML

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl"
>
    <xsl:output method="html" indent="yes"/>

  <xsl:template match="/Export">
    <html>
      <body>

        <table border="1">
          <tr bgcolor="#9acd32">
            <th>Master ID</th>
            <th>Master Name</th>
            <th>Detail</th>
          </tr>
          <xsl:for-each select="Master">
            <xsl:variable name="mid" select="MASTER_ID"/>
            <tr>
              <td>
                <xsl:value-of select="MASTER_ID"/>
              </td>
              <td>
                <xsl:value-of select="MASTER_NAME"/>
              </td>
              <!--The following solves the problem...-->
              <td>
                <xsl:variable name="data"
                     select="../Detail[MASTER_ID=$mid]/DETAIL_DATA"/>
                <xsl:choose>
                  <xsl:when test="$data">
                      <xsl:value-of select="$data"/>
                  </xsl:when>
                  <xsl:otherwise>
                      <xsl:text>&#160;</xsl:text>
                  </xsl:otherwise>
                </xsl:choose>
              </td>
            </tr>
          </xsl:for-each>
        </table>
      </body>
    </html>
  </xsl:template>


</xsl:stylesheet>

The resulting HTML is:

XML

<html>
  <body>
    <table border="1">
      <tr bgcolor="#9acd32">
        <th>Master ID</th>
        <th>Master Name</th>
        <th>Detail</th>
      </tr>
      <tr>
        <td>ID1</td>
        <td>Name 1</td>
        <td>Detail of of master 1</td>
      </tr>
      <tr>
        <td>ID2</td>
        <td>Name 2</td>
        <td>&#160;</td>
      </tr>
    </table>
  </body>
</html>