Transform XML Docs

Question

I have two XMLType tables and would like to transform the data from both of these tables and end up with one xmldocument and returned by a query.
It appears that there are several ways to accomplish this.
1. Write a query that uses xmlelement, xmlforest, etc. functions.
2. Use XMLQuery to accomplish this
3. Use XSLT.
I would like to use XSLT but I can't seem to figure out how to access the conents of one XMLTable from within a stylesheet. I know the document function is for opening files but I need the data to come from a XMLTable.
I am currently using 10.2.0.3
Thanks

Answer 1

Hi,
I was looking for something similar a few days ago and found 'CardPaymentGatewayApplication' in the sample code page for XMLDB.
I pasted a few lines of the SQL code from CPGA below. If it looks useful and need more details then you might want to download the code from http://www.oracle.com/technology/sample_code/tech/xml/xmldb/cpga/index.html
-Uma
1) register the XML schema
declare
doc varchar2(2000) := '<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb
">
<xs:element name="ACCOUNT">
</xs:element>
</xs:schema>';
begin
dbms_xmlschema.registerSchema('http://otn.oracle.com/account.xsd', doc);
end;
2) create XMLType table
CREATE TABLE CPG_ACCOUNTS of XMLType
XMLSCHEMA "http://otn.oracle.com/account.xsd"
ELEMENT "ACCOUNT";
3) Insert some values into the table
accxmldoc := XMLType.CREATEXML('
<ACCOUNT xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://otn.oracle.com/account.xsd">
</ACCOUNT>');
INSERT INTO cpg_accounts VALUES(accxmldoc);
4) create table to store the XSL files
CREATE TABLE CPG_XSL_TABLE(
FILENAME VARCHAR2(30) Unique ,
XSLDOC XMLTYPE
5) load the XSL stylesheet
DECLARE
xslsheet CLOB;
xmldoc XMLType;
BEGIN
xslsheet := '<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www
.w3.org/1999/XSL/Format">
<xsl:template match="EMPTY">
xmldoc:= XMLType.createXML(xslsheet);
INSERT INTO cpg_xsl_table VALUES ('updateAccountCard.xsl',xmldoc);
END;
6) sample transformation
FUNCTION getAccountDetailsHTML(accNo IN NUMBER) RETURN CLOB IS
-- Define the local variables
xslFile XMLTYPE;
acctXML XMLTYPE;
html XMLTYPE;
BEGIN
-- Retreive the XMLType account details into the 'acctXML' variable.
SELECT value(t) INTO acctXML
FROM cpg_accounts t
WHERE extractValue(value(t),'/ACCOUNT/ACC_NO') = accNo;
-- Retreive the XSLT stylesheet from the database that needs to be applied
-- to the 'acctXML' value retreived above.
SELECT xsldoc INTO xslFile FROM cpg_xsl_table
WHERE filename='account.xsl';
-- Apply the XMLtype.transform() function to get the transformed XML instance.
-- This function takes in an XMLType instance and an XSLT stylesheet.
-- It applies the stylesheet to the XML document and returns a transformed
-- XML instance.
html := acctXML.transform(xslFile);
-- Return the transformed XML instance as a CLOB value.
RETURN html.getCLOBVal();
END getAccountDetailsHTML;