Example: XSLT_SHRED Using genexp - Teradata Vantage NewSQL Engine - 16.20

Teradata Vantageā„¢ XML Data Type

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1140-162K

This example shows how to use the genexp declaration, which is required for XSLT_SHRED, unlike XSLT_SHRED_BATCH.

The Primary Index in the following example is not used as a key for the update.

Before running the example, ensure the test user is created with the required permissions and the required tables are created. See Setting Up the XSLT_SHRED_BATCH and XSLT_SHRED Examples for details.

Populate the staging table used to store the XML source document.

INSERT INTO DefaultValue3(C_id, C_Byteintc) values(1,1);

Call the XSLT_SHRED stored procedure to shred the XML document. The following arguments are used for the call.

  • The xmlDoc is created automatically in this example with the NEW XML statement.
  • The xsltMapping argument is supplied by invoking the CREATEXML function with a stylesheet as input. This stylesheet will be applied to the XML document.
  • The externalContext is NULL.
  • The resultCode is returned in :res. A successful operation returns 0.
CALL TD_SYSXML.XSLT_SHRED(NEW XML('<Root>
<AllTypes>
 <Numeric>
  <Byteintc>1</Byteintc>
  <Smallintc>200</Smallintc>
  <Intc>200</Intc>
  <Floatc>200</Floatc>
  <Decimalc>200</Decimalc>
  <Numberc>1200</Numberc>
 </Numeric>
</AllTypes>
<AllTypes>
 <Numeric>
  <Byteintc>2</Byteintc>
  <Smallintc>400</Smallintc>
  <Intc>400</Intc>
  <Floatc>400</Floatc>
  <Decimalc>400</Decimalc>
  <Numberc>1400</Numberc>
 </Numeric>
</AllTypes></Root>'), 	CREATEXML('<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:template match="/Root">
 <Transaction>
  <Update>
   <Table>
    <xsltuser.DefaultValue3 pkey="C_Byteintc">
     <xsl:for-each select="AllTypes">
      <Row>
        <C_Id genexp="cast(? as int)" default="10">
           <xsl:value-of select="Numeric/Bytec"/>
        </C_Id>
        <C_Byteintc genexp="cast(? as byteint)">
           <xsl:value-of select="Numeric/Byteintc"/>
        </C_Byteintc>
        <C_Smallintc genexp="cast(? as smallint)" >
           <xsl:value-of select="Numeric/Smallintc"/>
        </C_Smallintc> 
        <C_Intc genexp="cast(? as integer)">
           <xsl:value-of select="Numeric/Intc"/>
        </C_Intc>
      </Row>
     </xsl:for-each>
    </xsltuser.DefaultValue3>
   </Table>
  </Update>
 </Transaction>
</xsl:template>
</xsl:stylesheet>'), '',:res);

Result: To view the updated data in the target table, run:

SELECT * FROM DefaultValue3;

       C_Id  C_Byteintc  C_Smallintc       C_Intc
-----------  ----------  -----------  -----------
         10           1          200          200