How to dynamically create sql statement for Defaulting Segment Values?

Question

Hi,
Navigation:
1) Descriptive/Segments
2) Query for DFF to be modified
3) Uncheck “Freeze Flexfield Definition”
4) (B) Segments
5) Segments Summary form opens
6) (B) open - Segments form opens
Now, here I want to specify Default type as "SQL Statement" and in the default value field I want to use SQL statement with parameters (to evaluate the default value).
The parameters should be pass at runtime from the form in which we have this DFF. The parameters value should be one of the values which get evaluated at runtime in the form window.
Please suggest how we can achieve this?
Or is there any alternative to achieve this?
Thanks!!
Regards,
Narender
Edited by: Narender Singh on Mar 30, 2010 7:47 AM
Edited by: Narender Singh on Mar 30, 2010 7:48 AM

Answer 1

Jason,
it is possible, though not so simple as with a report.
What you need to do is to create a pipelined function, that returns your date and count data. This pipelined function can be the base of a pseudo-table, which can be used in a select. For the pipelined function you need to define types for one row and a table to define the return-type for your function:
create or replace type calendar_row as object (date_time date, description varchar2(250));
create type calendar_table as table of calendar_row;
Then you can create the package with the function:
================================================
create or replace package dyn_calendar is
procedure set_query(i_query in varchar2);
function view_source return calendar_table pipelined;
end;
create or replace package body dyn_calendar is
v_query varchar2(100) := null;
procedure set_query(i_query in varchar2) is
begin
v_query := i_query;
end;
function view_source return calendar_table pipelined is
TYPE cursor IS REF CURSOR;
c_cal cursor;
v_date_time date := null;
v_description varchar2(100) := null;
r_cal calendar_row;
begin
open c_cal for v_query;
fetch c_cal into v_date_time, v_description;
loop
exit when c_cal%notfound;
r_cal := calendar_row(v_date_time, v_description);
pipe row(r_cal);
fetch c_cal into v_date_time, v_description;
end loop;
return;
end;
end;
================================================
Now you can set query in a PL/SL region before the calendar:
dyn_calendar.set_query(SELECT count(*), ' || :P8_SOURCE_DATE || ' FROM ' || :P8_SOURCE_TABLE || ' GROUP BY ' || :P8_SOURCE_DATE);
and you can base your calendar on the query:
select * from table(dyn_calendar(view_source))
Good luck,
Dik