Oracle 根据调用源使用DBMS_OUTPUT或HTP

procedure output(i_msg in varchar2)
is
begin
  dbms_output.put_line(i_msg);
  -- if call is from apex i want to use htp.p
end;

procedure output(i_msg in varchar2)
is
begin
  if v('APP_USER') is null then
    dbms_output.put_line(i_msg);
  else
    htp.p(i_msg);
  end if;
end;

procedure output(i_msg in varchar2)
is
  dummy varchar2(100);
begin
  dummy := owa_util.GET_CGI_ENV('REMOTE_ADDR');
  htp.p(i_msg);
exception
  when others then 
        dbms_output.put_line(i_msg);
end;