Partial updates the Clob entries

Question

I have a xml stored in the Clob. it is just like follow,
<employee>
<corresponding_name>
<fname>Kishor</fname>
<lname>Sut</lname>
<email>[email protected]</email>
</corresponding_name>
<contact_info>
<home>4834342</home>
<office>52345234</office>
<mobile>986876856453</mobile>
<pager>23534634</pager>
</contact_info>
</employee>
Here I want to update the office phone of near about 100, 00 employee to new one. I can directly copy these xmls from toad, manually edit the office phone no, update the CLOB to EMPTY_CLOB() and upload this new xml again to CLOB using pl/sql. But it is not a wise solution, it's very time consuming and hectic and error-prone. Do any one have a easy solution for the same? Thanks in advance.
Regards,
Kamalnarayan Shrivastava

Answer 1

Hi Kamal,
Any idea about this???
I am getting the following error,
"ORA-20100: Error occurred while parsing: Error opening external DTD"
while parsing the xml document.
I am using Oracle api "sys.xmlparser.parsebuffer(p,xmlstrfinal);".
Where xmlstrfinal is the xml with '<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE messages SYSTEM "testdtd.dtd">' header.
I kept the dtd testdtd.dtd at location: /apps/oracle/admin/testserver/extproc/utl_file
The detailed example is below,
declare
     sqlquery varchar2(500);
     xmlstr clob;
     xmlstrfinal clob;
     xmlheaders varchar2(500);
     p xmlparser.Parser;
begin
     xmlheaders:='<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE messages SYSTEM "testdtd.dtd">';
     sqlquery:='SELECT XMLCONCAT(
     xmlelement("emp",xmlattributes('||'''2'''||' AS "id")
     , xmlelement("number", 29590)
     , xmlelement("name", 29590)
     , xmlelement("salary", 65000)
     , xmlelement("ele1", 1)
     , xmlelement("ele2", 2)
     , xmlelement("ele3", 3)
     , xmlelement("ele4", 4)
     )).GetClobVal() from dual';
     EXECUTE IMMEDIATE sqlquery into xmlstr;
     xmlstrfinal := xmlheaders||xmlstr;
     --dbms_output.put_line(xmlstr.extract('/').getStringVal());
     dbms_output.put_line(xmlstrfinal);
     -- Create a parser.
     p:= sys.xmlparser.newParser;     
     --buff:=xmlstr.extract('/').getStringVal();
     --xmlparser.parse(p,buff);
     sys.xmlparser.setvalidationmode (p, FALSE);
     sys.xmlparser.parsebuffer(p,xmlstrfinal);
     sys.xmlparser.freeParser(p);
     -- p.parsebuffer(buff);     
     exception
          when others then
               dbms_output.put_line('Error is: '||sqlerrm);
end;
Thanks in advance,
Kamal Shrivastava