Home/ Questions/Q 7060445
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-28T04:21:14+00:00

Joining data from different tables and displaying them in ordered manner using xslt: I

  • 0

Joining data from different tables and displaying them in ordered manner using xslt:
I have information about Customers and Products.
1 Customer can use many Products. (1:n relationship)
Similary 1 Product is consumed by many Customers. (1:n)

While I process Consumer node Information, I need to fetch Products information and display it in a tabluar / csv format.

While I process Products node Information, I need to fetch Customer information and display it in a tabluar / csv format.

Input is as below.

<?xml version='1.0' encoding='ISO-8859-1' ?>
<info>
<Customers>
    <Customer>
     <CustomerName>01NAME</CustomerName>
     <CustomerAddress>Address1</CustomerAddress>   
     <CustomerUsesProduct>
        <ProductUsed>
            <ProductNumber>PROD01</ProductNumber>
            <ProductNumber>PROD02</ProductNumber>        
        </ProductUsed>
        </CustomerUsesProduct>      
     <CustomerId>CUSTID01</CustomerId>      
    </Customer>

    <Customer>
     <CustomerName>02NAME</CustomerName>
     <CustomerAddress>Address2</CustomerAddress>   
     <CustomerUsesProduct>
        <ProductUsed>
            <ProductNumber>PROD01</ProductNumber>
        </ProductUsed>
        </CustomerUsesProduct>      
     <CustomerId>CUSTID02</CustomerId>      
    </Customer>

    <Customer>
     <CustomerName>03NAME</CustomerName>
     <CustomerAddress>Address3</CustomerAddress>   
     <CustomerUsesProduct>
        <ProductUsed>
            <ProductNumber>PROD03</ProductNumber>
        </ProductUsed>
        </CustomerUsesProduct>      
     <CustomerId>CUSTID03</CustomerId>
    </Customer>

</Customers>

<Products>
    <Product>
        <ProductId>PROD1</ProductId>
        <ProductDescription>ProdDesciption1</ProductDescription>
        <ProductCost>100</ProductCost>
        <CustomerWhoUseThisProduct>
            <CustomerNumber>CUSTID01</CustomerNumber>
        </CustomerWhoUseThisProduct>
    </Product> 

    <Product>
        <ProductId>PROD2</ProductId>
        <ProductDescription>ProdDesciption2</ProductDescription>
        <ProductCost>555</ProductCost>
        <CustomerWhoUseThisProduct>
            <CustomerNumber>CUSTID02</CustomerNumber>
        </CustomerWhoUseThisProduct>
    </Product> 

    <Product>
    <ProductId>PROD3</ProductId>
    <ProductDescription>ProdDesciption3</ProductDescription>
    <ProductCost>777</ProductCost>
    <CustomerWhoUseThisProduct>
        <CustomerNumber>CUSTID03</CustomerNumber>
    </CustomerWhoUseThisProduct>
    </Product>

</Products>
</info>

The purpose is to output in one single text file.Output expected is as shown below.

<CustomerInfo>
CustomerID|CustomerAddress|CustomerName|ProductIDUsed|ProductCost|ProductDescription
CUSTID01|Address1|01Name|PROD01|100|ProdDesciption1
CUSTID01|Address1|01Name|PROD02|555|ProdDesciption2
CUSTID02|Address2|02NAME|PROD01|100|ProdDesciption1
CUSTID03|Address3|03NAME|PROD03|777|ProdDesciption3

<ProductInformation>
ProductID|ProductCost|ProductDescription|CustomerID|CustomerAddress|CustomerName
PROD1|100|ProdDesciption1|CUSTID01|Address1|01NAME
PROD2|555|ProdDesciption2|CUSTID02|Address2|02NAME
PROD3|777|ProdDesciption3|CUSTID03|Address3|03NAME

If you consider the output is ordered (i.e. columns are ordered) according to expectation.
It appears I am joining two tables using a key and thats precisely what I am trying to do.

While processing Customers.

Customers/Customer/CustomerUsesProduct/ProductUsed/ProductNumber = Products/Product/ProductId

While processing Products.

Products/Product/CustomerWhoUseThisProduct/CustomerNumber = Customers/Customer/CustomerId

Since each node is referencing other, how to ensure that the there wont be a circular self reference whereby the application may hang.

Thanks in advance.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Edit: Added templates for ProductInformation

    I did have to change the /info/Products/Product/ProductId in your example XML file so they matched the /info/Customers/Customer/CustomerUsesProduct/ProductUsed/ProductNumber.

    Updated input XML:

    <info>
  <Customers>
    <Customer>
      <CustomerName>01NAME</CustomerName>
      <CustomerAddress>Address1</CustomerAddress>   
      <CustomerUsesProduct>
        <ProductUsed>
          <ProductNumber>PROD01</ProductNumber>
          <ProductNumber>PROD02</ProductNumber>        
        </ProductUsed>
      </CustomerUsesProduct>      
      <CustomerId>CUSTID01</CustomerId>      
    </Customer>

    <Customer>
      <CustomerName>02NAME</CustomerName>
      <CustomerAddress>Address2</CustomerAddress>   
      <CustomerUsesProduct>
        <ProductUsed>
          <ProductNumber>PROD01</ProductNumber>
        </ProductUsed>
      </CustomerUsesProduct>      
      <CustomerId>CUSTID02</CustomerId>      
    </Customer>

    <Customer>
      <CustomerName>03NAME</CustomerName>
      <CustomerAddress>Address3</CustomerAddress>   
      <CustomerUsesProduct>
        <ProductUsed>
          <ProductNumber>PROD03</ProductNumber>
        </ProductUsed>
      </CustomerUsesProduct>      
      <CustomerId>CUSTID03</CustomerId>
    </Customer>

  </Customers>

  <Products>
    <Product>
      <ProductId>PROD01</ProductId>
      <ProductDescription>ProdDesciption1</ProductDescription>
      <ProductCost>100</ProductCost>
      <CustomerWhoUseThisProduct>
        <CustomerNumber>CUSTID01</CustomerNumber>
      </CustomerWhoUseThisProduct>
    </Product> 

    <Product>
      <ProductId>PROD02</ProductId>
      <ProductDescription>ProdDesciption2</ProductDescription>
      <ProductCost>555</ProductCost>
      <CustomerWhoUseThisProduct>
        <CustomerNumber>CUSTID02</CustomerNumber>
      </CustomerWhoUseThisProduct>
    </Product> 

    <Product>
      <ProductId>PROD03</ProductId>
      <ProductDescription>ProdDesciption3</ProductDescription>
      <ProductCost>777</ProductCost>
      <CustomerWhoUseThisProduct>
        <CustomerNumber>CUSTID03</CustomerNumber>
      </CustomerWhoUseThisProduct>
    </Product>

  </Products>
</info>

    XSLT 1.0

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text"/>
  <xsl:strip-space elements="*"/>

  <xsl:template match="node()|@*">
    <xsl:apply-templates select="node()|@*"/>
  </xsl:template>

  <xsl:template match="Customers">
    <xsl:text>&#xA;&lt;CustomerInfo&gt;&#xA;</xsl:text>
    <xsl:text>CustomerID|CustomerAddress|CustomerName|ProductIDUsed|ProductCost|ProductDescription&#xA;</xsl:text>
    <xsl:apply-templates/>
  </xsl:template>

  <xsl:template match="Customer">
    <xsl:variable name="vId" select="CustomerId"/>
    <xsl:variable name="vName" select="CustomerName"/>
    <xsl:variable name="vAddress" select="CustomerAddress"/>
    <xsl:for-each select="CustomerUsesProduct/ProductUsed/ProductNumber">
      <xsl:variable name="vCost" select="/info/Products/Product[ProductId=current()]/ProductCost"/>
      <xsl:variable name="vDesc" select="/info/Products/Product[ProductId=current()]/ProductDescription"/>
      <xsl:value-of select="concat($vId,'|',$vAddress,'|',$vName,'|',.,'|',$vCost,'|',$vDesc,'&#xA;')"/>
    </xsl:for-each>
  </xsl:template>

  <xsl:template match="Products">
    <xsl:text>&#xA;&lt;ProductInformation&gt;&#xA;</xsl:text>
    <xsl:text>ProductID|ProductCost|ProductDescription|CustomerID|CustomerAddress|CustomerName&#xA;</xsl:text>
    <xsl:apply-templates/>
  </xsl:template>

  <xsl:template match="Product">
    <xsl:variable name="vId" select="ProductId"/>
    <xsl:variable name="vCost" select="ProductCost"/>
    <xsl:variable name="vDesc" select="ProductDescription"/>
    <xsl:for-each select="CustomerWhoUseThisProduct/CustomerNumber">
      <xsl:variable name="vName" select="/info/Customers/Customer[CustomerId=current()]/CustomerName"/>
      <xsl:variable name="vAddress" select="/info/Customers/Customer[CustomerId=current()]/CustomerAddress"/>      
      <xsl:value-of select="concat($vId,'|',$vCost,'|',$vDesc,'|',.,'|',$vAddress,'|',$vName,'&#xA;')"/>
    </xsl:for-each>
  </xsl:template>

</xsl:stylesheet>

    Text output:

    <CustomerInfo>
CustomerID|CustomerAddress|CustomerName|ProductIDUsed|ProductCost|ProductDescription
CUSTID01|Address1|01NAME|PROD01|100|ProdDesciption1
CUSTID01|Address1|01NAME|PROD02|555|ProdDesciption2
CUSTID02|Address2|02NAME|PROD01|100|ProdDesciption1
CUSTID03|Address3|03NAME|PROD03|777|ProdDesciption3

<ProductInformation>
ProductID|ProductCost|ProductDescription|CustomerID|CustomerAddress|CustomerName
PROD01|100|ProdDesciption1|CUSTID01|Address1|01NAME
PROD02|555|ProdDesciption2|CUSTID02|Address2|02NAME
PROD03|777|ProdDesciption3|CUSTID03|Address3|03NAME
    • 0