Changes to xml data in clob

Question

Hi,
I have a table with xml_data in long raw form , i am converting the data in long raw to clob this process is working fine .
but later i need to make changes to the xml_data in the clob , when the xml data is small the changes occur but in case of huge xml data the process gets hanged . I am using dbms_lob.instr , dbms_lob.substr function and a procedure for replace as there is not built in dbms_lob.replace function.....
can anyone plzzzzzzzzz help me out with the same.......... its urgent
Message was edited by:
user500620

Answer 1

Thank you, Kamal. I am learning as I going along with the project : )
I do understand the examples that you have provided me with.
This is the table structure I query against. (table name audit_v3)
(column : adt_xml_desc CLOB )
select to_char(
substr(a.adt_xml_desc,
INSTR(a.adt_xml_desc, '<CONTACT_HISTORY>',1,1),
INSTR(a.adt_xml_desc, '</CONTACT_HISTORY>',1,1)-INSTR(a.adt_xml_desc, '<CONTACT_HISTORY>',1,1)+18 )
from audit_v3 a
where a.adt_id = 7397337;
The result that I get = <CONTACT_HISTORY><USER><USER_ID>W951FVK</USER_ID><FIRST_NAME>Krishna</FIRST_NAME><LAST_NAME>Rajamani</LAST_NAME></USER><CONSUMER><CONS_SEQ_NBR>0</CONS_SEQ_NBR></CONSUMER></CONTACT_HISTORY>
Now I want to store it in a varchar2 variable and then pass it to the xmltype to get individual data values. This is where I am having issue with.
1. Do I store the value above in a varchar2?
2. Can I pass the variable into the xmltype?
Thank you very much, Kamal.
declare
xml xmltype ;
test1 varchar2(1000);
begin
select to_char(v.adt_xml_desc) into test1 from audit_v3 v where v.adt_id = 7397337;
xml := xmltype('''' ||test1||'''');
/* xml := xmltype('<EVENT>
<SWTSUPDATE TYPE="1">
<MEMBERID>9822598</MEMBERID>
<DATETIME>Fri Jun 09 14:51:33 CDT 2006</DATETIME>
<USERID>W951FVK</USERID>
</SWTSUPDATE>
<CONTACT_HISTORY>
<USER>
<USER_ID>W951FVK</USER_ID>
<FIRST_NAME>Krishna</FIRST_NAME>
<LAST_NAME>Rajamani</LAST_NAME>
</USER>
<CONSUMER>
<CONS_SEQ_NBR>1387445</CONS_SEQ_NBR>
<FIRST_NAME>SPRINGHOUSE</FIRST_NAME>
<LAST_NAME>ELLIS</LAST_NAME>
</CONSUMER>
</CONTACT_HISTORY>
</EVENT>') ;
dbms_output.put_line(xml.extract('/EVENT/CONTACT_HISTORY/USER/LAST_NAME/text()').getStringVal()) ;
end ;