Question about creating multiple XML files from same query

Question

I have a query like this:
select * from emp;
ename empno deptno
Scott 10001 10
Tiger 10002 10
Hanson 10003 20
Jason 10004 30
I need to create multiple output files in xml format for each dept
example:
emp_dept_10.xml
emp_dept_20.xml
emp_dept_30.xml
each file will have the information for employees in different departmemts.
We are using DBMS_XMLGEN package to generate XML.
The reason I need to do this is to avoid executing the same query 200 times for generating the same output for different departments. Please let me know if it is practically possible to do this.
Any input is greatly appreciated.
Thanks a lot!!

Answer 1

one solution i can think of is to use SQLX operator instead of dbms_xmlgen.
here is a sample example.
declare
  l_xmltype xmltype;
  l_deptno  emp.deptno%type;
begin
  for i in (select * from emp order by deptno)
  loop
    select xmlconcat(
                xmlelement("ename", i.ename)
               ,xmlelement("sal", i.sal)
               ,xmlelement("detpno", i.deptno))
      into l_xmltype from dual;
    dbms_output.put_line(l_xmltype.GetClobVal());
  end loop;
end;
/Now here you can open the query once, keep writing to the file till the deptno
is same, when the deptno changes, close the file and open a new file with new
deptno and start writing.
Note : in this way you will have to add the xmlprolog manually to each of the file which should not be an issue. after opening the file add the prolog string manually.
Hope this helps.