How to write procedure with this requirement

Question

Hi
I've a skeleton procedure.
In that i need to include the following conditions:
If an exception is returned (sqlca.sqlcode!=0),
the program rolls back the transaction and aborts, logging the Oracle error message.
In case of normal return, the program commits the transactions and exits normally.......................
So could you please give me the idea how to include these 2 conditions..
procedure processFile(
        fname IN VARCHAR2,
        flRcvTmst IN DATE) IS
V_PROC_STS VARCHAR2:='I';
BEGIN
  INSERT INTO TMO_QPP_FL_T (QPP_FL_ID,FL_NM,FL_RCV_TMST,PROC_STS,YR_COVERED)
                    VALUES     (Q_QPP_FL_ID.NEXTVAL,fname,flRcvTmst,V_PROC_STS,NULL)
END;    Thanks,

Answer 1

SQLERRM just gives the error message right? We dont get nothing else. But as a developer i prefer to have the entire error stack, that can help me a lot to debug.
SQL> create or replace procedure p1
  2  as
  3     lVal number;
  4  begin
  5     select 1 into lVal from dual where 1 = 2;
  6  end;
  7  /
Procedure created.
SQL> create or replace procedure p2
  2  as
  3  begin
  4     p1;
  5  end;
  6  /
Procedure created.
SQL> create or replace procedure p3
  2  as
  3  begin
  4     p2;
  5  end;
  6  /
Procedure created.
SQL> set autotrace on
SQL> set autotrace off
SQL> set serveroutput on
SQL> begin
  2     p3;
  3  exception
  4     when others then
  5             dbms_output.put_line(sqlerrm);
  6  end;
  7  /
ORA-01403: no data found
PL/SQL procedure successfully completed.This gives me nothing. How do i know where have i hit "no data found"
SQL> begin
  2     p3;
  3  exception
  4     when others then
  5             dbms_output.put_line(DBMS_UTILITY.FORMAT_ERROR_BACKTRACE);
  6  end;
  7  /
ORA-06512: at "SYSADM.P1", line 5
ORA-06512: at "SYSADM.P2", line 4
ORA-06512:
at "SYSADM.P3", line 4
ORA-06512: at line 2
PL/SQL procedure successfully completed.Here i get a complete error stack telling me at which line the error has been raised at each level. Makes my debugging more easier.
Thanks,
Karthick.