how to apply group by on xslt elements

Question

I need to group the value based on some attribute and populate it.

below mentioned is i/p xml and if you see there are 4 rows for Users and for id 2,4 Division is same i.e. HR

while generating actual o/p I need to group by Division ... Any help ???

I/P XML

<Users>
 <User id="2" name="ABC" Division="HR"/> 
 <User id="3" name="xyz" Division="Admin"/> 
 <User id="4" name="LMN" Division="Payroll"/> 
 <User id="5" name="PQR" Division="HR"/> 
</Users>

expected Result: I need to group the values based on Division and populate i.e.

<AllUsers>
 <Division value="HR">
  <User> 
   <id>2</id>
   <name>ABC</name>
  </User> 
  <User> 
   <id>5</id>
   <name>PQR</name>
  </User>
 </Division>
 <Division value="ADMIN">
  <User> 
   <id>3</id>
   <name>XYZ</name>
  </User> 
 </Division>
 <Division value="Payroll">
  <User> 
   <id>4</id>
   <name>LMN</name>
  </User> 
 </Division>
</AllUsers>

Lachlan Roche · Accepted Answer · 2013-12-06 04:34:45Z

In XSLT 1.0, using Muenchian grouping.

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

    <xsl:output method="xml" indent="yes" />

    <xsl:key name="division" match="User" use="@Division" />

    <xsl:template match="Users">
        <AllUsers>
            <xsl:apply-templates select="User[generate-id(.)=generate-id(key('division',@Division)[1])]"/>
        </AllUsers>
    </xsl:template>

    <xsl:template match="User">
        <Division value="{@Division}">
            <xsl:for-each select="key('division', @Division)">
                <User>
                    <id><xsl:value-of select="@id" /></id>
                    <name><xsl:value-of select="@name" /></name>
                </User>
            </xsl:for-each>
        </Division>
    </xsl:template>

</xsl:stylesheet>

In XSLT 2.0, use xsl:foreach-group

<xsl:output method="xml" indent="yes" />

<xsl:template match="Users">
    <AllUsers>
        <xsl:for-each-group select="User" group-by="@Division">
            <Division value="{@Division}">
                <xsl:for-each select="current-group()">
                    <User>
                        <id><xsl:value-of select="@id" /></id>
                        <name><xsl:value-of select="@name" /></name>
                    </User>
                </xsl:for-each>
            </Division>
        </xsl:for-each-group>
    </AllUsers>
</xsl:template>

Dave Jarvis · Accepted Answer · 2022-09-30 16:08:23Z

2

use

<xsl:for-each-group select="*" group-by="@Division"> 
....
</xsl:for-each-group>

edited Sep 30, 2022 at 16:08

Dave Jarvis

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answered Jan 27, 2010 at 12:18

Pentium10

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Comments

Hash · Accepted Answer · 2013-11-04 03:12:34Z

I don't prefer adding elements like that and this is what i will do. This works perfectly. It gives the output you need. Try it out.

XML

<?xml version="1.0"?>
<Users>
 <User id="2" name="ABC" Division="HR"/> 
 <User id="3" name="xyz" Division="Admin"/> 
 <User id="4" name="LMN" Division="Payroll"/> 
 <User id="5" name="PQR" Division="HR"/> 
</Users>

XSLT 1.0

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
   <xsl:output method="xml" indent="yes" />
   <xsl:key name="division" match="User" use="@Division" />
   <xsl:template match="Users">
      <xsl:element name="AllUsers">
         <xsl:apply-templates select="User[generate-id(.)=generate-id(key('division',@Division)[1])]" />
      </xsl:element>
   </xsl:template>
   <xsl:template match="User">
      <xsl:element name="Division">
         <xsl:attribute name="value">
            <xsl:value-of select="@Division" />
         </xsl:attribute>
         <xsl:for-each select="key('division', @Division)">
            <xsl:element name="User">
               <xsl:element name="id">
                  <xsl:value-of select="@id" />
               </xsl:element>
               <xsl:element name="name">
                  <xsl:value-of select="@name" />
               </xsl:element>
            </xsl:element>
         </xsl:for-each>
      </xsl:element>
   </xsl:template>
</xsl:stylesheet>

XSLT 2.0

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
   <xsl:output method="xml" indent="yes" encoding="UTF-8" omit-xml-declaration="yes" />
   <xsl:key name="division" match="User" use="@Division" />
   <xsl:template match="Users">
      <xsl:element name="AllUsers">
         <xsl:for-each-group select="*" group-by="@Division">
            <xsl:element name="Division">
               <xsl:attribute name="value">
                  <xsl:value-of select="@Division" />
               </xsl:attribute>
               <xsl:for-each select="current-group()">
                  <xsl:element name="User">
                     <xsl:element name="id">
                        <xsl:value-of select="@id" />
                     </xsl:element>
                     <xsl:element name="name">
                        <xsl:value-of select="@name" />
                     </xsl:element>
                  </xsl:element>
               </xsl:for-each>
            </xsl:element>
         </xsl:for-each-group>
      </xsl:element>
   </xsl:template>
</xsl:stylesheet>

Using either will give you this output,

<AllUsers>
   <Division value="HR">
      <User>
         <id>2</id>
         <name>ABC</name>
      </User>
      <User>
         <id>5</id>
         <name>PQR</name>
      </User>
   </Division>
   <Division value="Admin">
      <User>
         <id>3</id>
         <name>xyz</name>
      </User>
   </Division>
   <Division value="Payroll">
      <User>
         <id>4</id>
         <name>LMN</name>
      </User>
   </Division>
</AllUsers>

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