Read XML message from a CLOB

Question

We are currently receiving XML messages from a business partner that goes
through a transformation/parser first to make sure the xml document was
in MISMO form (Mortgage Industry Standard Message Organization). Then the
document is stored in a clob in a table. The document is stored Without
the tags. We are storing these XML messages into a CLOB datatype for
later processing. I want to read the CLOB and then parse out the
individual fields to store into a table. What is the best way to
accomplish this in PL/SQL? Here is one sample record:
<MORTGAGEDATA>
<APPLICATION LoanPurposeType="OTHER">
<LenderCaseIdentifier>3631681</LenderCaseIdentifier>
<LendersBranchIdentifier>2966448</LendersBranchIdentifier>
</APPLICATION>
<PROPERTY PropertyUsageType="Primary">
<Address1>1335 test</Address1>
<City>las cruces</City>
<State>NM</State>
<PostalCode>88001</PostalCode>
</PROPERTY>
<SUBJECTPROPERTY>
<SubjectPropertyEstimatedValueAmount>69000</SubjectPropertyEstimatedValueAmount>
</SUBJECTPROPERTY>
<BORROWERRECONCILEDLIABILITY LiabilityType="HelocSubjectProperty">
<LiabilityUnpaidBalanceAmount>0</LiabilityUnpaidBalanceAmount>
<LiabilityMonthlyPaymentAmount>0</LiabilityMonthlyPaymentAmount>
</BORROWERRECONCILEDLIABILITY>
<BORROWERRECONCILEDLIABILITY LiabilityType="MortgageLoanSubjectProperty">
<LiabilityUnpaidBalanceAmount>0</LiabilityUnpaidBalanceAmount>
</BORROWERRECONCILEDLIABILITY>
<BORROWER>
<FirstName>scooby</FirstName>
<MiddleName/>
<LastName>doo</LastName>
<NameSuffix/>
<MothersMaidenName>velma</MothersMaidenName>
</BORROWER>
</MORTGAGEDATA>
NOTE: I have tried to use DBMS_XMLQUERY and it comes out like this using a
stored procedure called printclob: When I do this the data is put into
one field called xml_app_msg. The problem is how do I reference the
individual fields like FirstName and so on to store in another table? Can
I apply a stylesheet and if so, how?
Or do I create an object type called xml_app_msg with the fields lastname
and so on?
-- The table is raw_xml_msg_tbl and the field with the stored infomation is
xml_app_msg.
set serveroutput on size 50000
declare
queryCtx DBMS_XMLquery.ctxType;
result CLOB;
begin
queryCtx := DBMS_XMLQuery.newContext('select xml_app_msg from raw_xml_msg_tbl where app_id = :APP_ID');
-- DBMS_XMLQuery.clearBindValue(queryCtx);
DBMS_XMLQuery.setBindValue(queryCtx,'APP_ID','LT1001');
-- get the result..!
result := DBMS_XMLQuery.getXML(queryCtx);
-- Now you can use the result to put it in tables/send as messages..
printClobOut(result);
DBMS_XMLQuery.closeContext(queryCtx); -- you must close the query handle..
end;
OUTPUT:
<?xml version = '1.0'?>
<ROWSET>
<ROW num="1">
<XML_APP_MSG><MORTGAGEDATA>
<BORROWER>
<FirstName>Falls</FirstName>
<MiddleName/>
<LastName>Water</LastName>
<NameSuffix/>
<SSN>123-45-6789</SSN>
</BORROWER>
</MORTGAGEDATA>
</XML_APP_MSG>
</ROW>
</ROWSET>
null

Answer 1

I parse the XML doc into a domdocument and then loop through using xpath.valueof to pull the individual values from the nodes and then build a generic insert. It works quite well with a small number of columns. I'm not sure how it would work with a lot of columns. You can get code examples from Steve Muench's book "Developing Oracle XML Applications".