How to extract data from CLOB and insert them into DB?

Hi PL/SQL Gurus,
I have no experience in PL/SQL, but I have a requirement now where I have to use it.
We have a table with 10 columns, one of them is a CLOB and it holds XML data. The XMLs are very huge in size.
Two new columns are added to the table and the data has to be filled for the existing records from the corresponding XML. The XML has all the data as attributes. I started searching on the internet and tried if I could extract the data out of XML.
SELECT extractValue(value(x), '/Order/Package/@Code',
'xmlns:ns0="http://mycompany.com/Order/OrderType.xsd"' )
FROM ORDER_TABLE A
, TABLE(
XMLSequence(
extract(
xmltype(A.XML_DATA)
, '/ns0:Root'
, 'xmlns:ns0="http://mycompany.com/Order/OrderType.xsd"'
) x;
But this isn't working. Could anyone please provide some ideas.
I just want to confirm that I am able to extract data. Once this is done I would like to create a procedure so that all the existing records can be updated.
Thanks in advance.
Regards,
Fazzy

Can this be acheived using a SQL statement.Yes, you can do it with the DML error logging clause.
Here's a quick example I've just set up :
Base table
SQL> create table order_table (
  2   order_id number,
  3   package_code varchar2(30),
  4   package_desc varchar2(100),
  5   xml_data clob
  6  );
Table created
SQL> alter table order_table add constraint order_table_pk primary key (order_id);
Table altered
Adding data...
SQL> insert into order_table (order_id, xml_data)
  2  values (1, '<?xml version="1.0" encoding="UTF-8"?>
  3  <ns0:Root xmlns:ns0="http://mycompany.com/Order/OrderType.xsd" BookingDate="2009-06-07">
  4  <ns1:OrderKey xmlns:ns1="http://mycompany.com/Order/OrderKeyTypes.xsd" SystemCode="THOMAS" Id="458402-TM1" Version="1"/>
  5  <ns0:Package Code="0001" Desc="ProductName1"/>
  6  <ns0:PromotionGroup Code="DSP" Name="OrderThomasPortal"/>
  7  <ns0:Promotion Code="TH902" Name="OrderThomasPortal" SellingName="OrderThomasPortal" BackOfficeName="OrderThomasPortal"/>
  8  <ns0:FinancialSupplier Code="HHT" Name="NYOrdSupp"/>
  9  <ns0:SellingCurrency Code="EUR" Name="Euro"/>
10  <ns0:Owner ClientId="02654144" ClientMandator="T" ClientSystem="ROSY"/>
11  <ns0:Agent PersonInAgency="5254" AgentCode="000009" CommissionAmount="2.8" CommissionDueDate="2009-07-01+02:00" VatOnCommission="0"/>
12  </ns0:Root>');
1 row inserted
SQL> insert into order_table (order_id, xml_data)
  2  values (2, '<?xml version="1.0" encoding="UTF-8"?>
  3  <ns0:Root xmlns:ns0="http://mycompany.com/Order/OrderType.xsd" BookingDate="2009-06-07">
  4  <ns1:OrderKey xmlns:ns1="http://mycompany.com/Order/OrderKeyTypes.xsd" SystemCode="THOMAS" Id="458402-TM1" Version="1"/>
  5  <ns0:Package Code="0002" Desc="ProductName2/>
  6  <ns0:PromotionGroup Code="DSP" Name="OrderThomasPortal"/>
  7  <ns0:Promotion Code="TH902" Name="OrderThomasPortal" SellingName="OrderThomasPortal" BackOfficeName="OrderThomasPortal"/>
  8  <ns0:FinancialSupplier Code="HHT" Name="NYOrdSupp"/>
  9  <ns0:SellingCurrency Code="EUR" Name="Euro"/>
10  <ns0:Owner ClientId="02654144" ClientMandator="T" ClientSystem="ROSY"/>
11  <ns0:Agent PersonInAgency="5254" AgentCode="000009" CommissionAmount="2.8" CommissionDueDate="2009-07-01+02:00" VatOnCommission="0"/>
12  </ns0:Root>');
1 row inserted
SQL> commit;
Commit complete
{code}
Note that the second row inserted contains a not well-formed XML (no closing quote for the /Root/Package/@Desc attribute).
*Creating the error logging table...*
{code}
SQL> create table error_log_table (
  2   ora_err_number$ number,
  3   ora_err_mesg$   varchar2(2000),
  4   ora_err_rowid$  rowid,
  5   ora_err_optyp$  varchar2(2),
  6   ora_err_tag$    varchar2(2000)
  7  );
Table created
{code}
*Updating...*
{code}
SQL> update (
  2    select extractvalue(doc, '/ns0:Root/ns0:Package/@Code', 'xmlns:ns0="http://mycompany.com/Order/OrderType.xsd"') as new_package_code
  3         , extractvalue(doc, '/ns0:Root/ns0:Package/@Desc', 'xmlns:ns0="http://mycompany.com/Order/OrderType.xsd"') as new_package_desc
  4         , package_code
  5         , package_desc
  6    from (
  7      select package_code
  8           , package_desc
  9           , xmltype(xml_data) doc
10      from order_table t
11    )
12  )
13  set package_code = new_package_code
14    , package_desc = new_package_desc
15  log errors into error_log_table ('My update process')
16  reject limit unlimited
17  ;
1 row updated
SQL> select order_id, package_code, package_desc from order_table;
  ORDER_ID PACKAGE_CODE                   PACKAGE_DESC
         1 0001                           ProductName1
         2                               
{code}
One row has been updated as expected, the other has been rejected and logged into the error table :
{code}
SQL> select * from error_log_table;
ORA_ERR_NUMBER$ ORA_ERR_MESG$                                                                    ORA_ERR_ROWID$     ORA_ERR_OPTYP$ ORA_ERR_TAG$
          31011 ORA-31011: XML parsing failed                                                    AAAF6PAAEAAAASnAAB U              My update process
                ORA-19202: Error occurred in XML processing                                                                       
                LPX-00244: invalid use of less-than ('<') character (use &lt;)                                                    
                Error at line 5                                                                                                   
                ORA-06512: at "SYS.XMLTYPE", line 272                                                                             
                ORA-06512: at line 1                                                                                              
{code}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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