Required to create a script for base table update using XMLSTORE package.

Question

Hi can anybody provide me some help full suggestion on how to update base table using XMLSTORE package.
I created a simple script for Employee table and can able to do the basic operation like Insert and update on the table.
Query is as follow's
DECLARE
insCtx DBMS_XMLSTORE.ctxType;
rows NUMBER;
xmlDoc CLOB :=
'<ROWSET>
<ROW num="1">
<EMPLOYEE_ID>922</EMPLOYEE_ID>
<SALARY>1801</SALARY>
<HIRE_DATE>17-DEC-2007</HIRE_DATE>
<JOB_ID>ST_CLERK</JOB_ID>
<EMAIL>RAUSSJACK</EMAIL>
<LAST_NAME>JACK</LAST_NAME>
<DEPARTMENT_ID>20</DEPARTMENT_ID>
</ROW>
<ROW>
<EMPLOYEE_ID>923</EMPLOYEE_ID>
<SALARY>2001</SALARY>
<HIRE_DATE>31-DEC-2005</HIRE_DATE>
<JOB_ID>ST_CLERK</JOB_ID>
<EMAIL>PATHAK</EMAIL>
<LAST_NAME>PRATIK</LAST_NAME>
<DEPARTMENT_ID>20</DEPARTMENT_ID>
</ROW>
</ROWSET>';
BEGIN
insCtx := DBMS_XMLSTORE.newContext('EMPLOYEES'); -- Get saved context
DBMS_XMLSTORE.clearUpdateColumnList(insCtx); -- Clear the update settings
-- Set the columns to be updated as a list of values
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'EMPLOYEE_ID');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'SALARY');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'HIRE_DATE');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'JOB_ID');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'EMAIL');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'LAST_NAME');
DBMS_XMLSTORE.setUpdateColumn(insCtx, 'DEPARTMENT_ID');
-- Insert the doc.
rows := DBMS_XMLSTORE.insertXML(insCtx, xmlDoc);
--COMMIT;
DBMS_OUTPUT.put_line(rows || ' rows inserted.');
-- Close the context
DBMS_XMLSTORE.closeContext(insCtx);
END;
SELECT employee_id, LAST_name FROM employees WHERE employee_id = 114;
DECLARE
updCtx DBMS_XMLSTORE.ctxType;
rows NUMBER;
xmlDoc CLOB :=
'<ROWSET>
<ROW>
<EMPLOYEE_ID>114</EMPLOYEE_ID>
<LAST_NAME>PRABHU</LAST_NAME>
</ROW>
</ROWSET>';
BEGIN
updCtx := DBMS_XMLSTORE.newContext('EMPLOYEES'); -- get the context
DBMS_XMLSTORE.clearUpdateColumnList(updCtx); -- clear update settings
-- Specify that column employee_id is a "key" to identify the row to update.
DBMS_XMLSTORE.setKeyColumn(updCtx, 'EMPLOYEE_ID');
rows := DBMS_XMLSTORE.updateXML(updCtx, xmlDoc); -- update the table
DBMS_XMLSTORE.closeContext(updCtx); -- close the context
commit;
END;
Nowi want little modification on this above query like as i am passing static XML tags and i want it to pick the dynamic XML from web and use the XMLSTORE for the update.
and also for complex XML having 2-3 levels how this query needs to be changed.As i am new to this Oracle utillity any help from xepert will be a great help for me.
Thanks

Answer 1

Nowi want little modification on this above query like as i am passing static XML tags and i want it to pick the dynamic XML from webFrom a Web Service?
You'll need UTL_HTTP or HttpUriType interface to send the request and receive the XML response.
Search in the forum, there are already a lot of useful examples available.
and also for complex XML having 2-3 levels how this query needs to be changed.DBMS_XMLStore is OK for readily processing a canonical XML format (/ROWSET/ROW/COLUMN structure or alike).
However, if you have to deal with a more complex structure, you either have to :
- use a target object table that matches the XML structure
- preprocess the input document using XSLT to transform it to canonical format
That's why DBMS_XMLStore is not appropriate for multilevel documents, especially if they contain nested repeating groups.
In this case, XMLTable is a more flexible way of parsing the XML and process it relationally at the same time.
Depending on the size of the document, performance may be improved with schema-based object-relational storage.
For more help, please post a new thread in the {forum:id=34} forum, with the following information :
- database version (select * from v$version)
- a sample XML document (the complex one)
- DDL of your target table
- mapping between XML elements and columns (ie which tag goes to which column?)
- an XML schema (if you have one)