Map several records to different elements in the same xml node

Question

Hi,
I am trying to map data from relational tables to elements as per my xml schema. One of my tables has several records that I need to map to different elements in the same xml node.
For example:
Customer_Id | Param_Id |Param_Name
212 | 1 |State
212 | 2 |Country
212 | 3 |ZipCode
I can not change the structure of this existing table and need to work with it.
How do I map the different params for a specific customer to my Customer node in the schema?
One option is to join on the parameters table several times, but there ought to be a better way!
PLEASE HELP!!!
Thanks,

Answer 1

First I question the design that contains/allows 600 attributes on an element. They sound like they really should be elements in the XML.
Regardless, the following (NOT TESTED) should work for you (assuming you want to write one SQL with 600 columns)
CREATE OR REPLACE VIEW APPLICATION_XML
OF XMLTYPE
Element "LOAN_APPLICATION"
with object ID
substr(extractValue(object_value,'/LOAN_APPLICATION/APPLICATION_DATA/@CallID'),1,5)
AS
WITH parm_tb AS
SELECT MAX(DECODE(prv_valu, 1, prv_value)) BusinessType,
       MAX(DECODE(param_id, 2, prv_value)) Product,
       MAX(DECODE(param_id, 3, prv_value)) SomethingElse
  FROM parameter_details
WHERE prv_pmh_header_id = 1
SELECT xmlElement
   ("APPLICATION_DATA",
     xmlAttributes
      p.prv_detail_id as "CallID",
      p.PRV_PRM_PARAM_ID as "RandomID",
      p.prv_value as AppInitDate
     xmlElement
     ("PRODUCER_DATA",
       xmlAttributes
        parm_tb.BusinessType as "BusinessType" ,
        parm_tb.Product as "Product"
  FROM parameters_table p
WHERE p.PRV_PMH_HEADER_ID = 1