Trigger for wirting to file

Question

Hello everyone!
What I need to do is:
Everytime there is a specific insert into a table of the database I have to retrieve the row inserted and write the the contents of the row into a file in xml format.
Can anyone help me how to do this?

Answer 1

I have prepared a Crude code. This might suite your needs. If it doesn't, you shall still have an idea of how to proceed to solve the problem.
create table test_table (pk_col number, col varchar2(10));
create table store_mod_xml (col clob);
insert into store_mod_xml values (empty_clob());
select * from store_mod_xml;
create or replace trigger trg_test_tab
after insert on test_table
for each row
declare
l_clob    store_mod_xml.col%type;
l_str     varchar2(4000);
begin
  begin
    select col
      into l_clob
      from store_mod_xml;
  exception
    when others then
      null;
  end;
  if l_clob = empty_clob() then
    dbms_lob.createtemporary(l_clob, true);
    l_str := '<?xml version="1.0"?>';
    dbms_lob.append(l_clob, l_str);
  end if;
  l_str := '<PK_COL>' || :new.pk_col || '</PK_COL>' || CHR(10) || '<COL>' || :new.col || '</COL>' || CHR(10);
  dbms_lob.append(l_clob, l_str);
  update store_mod_xml set col = l_clob;
end;
insert into test_table values (1, 'A');
insert into test_table values (2, 'B');
insert into test_table values (3, 'C');
insert into test_table values (4, 'D');
insert into test_table values (5, 'E');This is not a well-tested code so I would recommend to test before using it.
After you have the CLOB in table, you can export it to a file using UTL_FILE. This Link might help you in accomplishing it.
Regards,
P
Edited by: PurveshK on May 29, 2012 1:24 PM