Placeholder or User Parameter receiving directly from a field.

Question

I can place as well placeholder as much as user parameter inputs in my report. My issue is when query returns no rows, but I need to show in this case user input datas, and my variable(placeholder or user parameter) is just syncronized with user inputs. But I wanna to change value when no rows returned it shows user inputs, and when there are rows, show a field at query.
Assumed i.g:
SELECT NM_NAME FROM MY_TABLE WHERE NM_NAME = :NAME
I have one placeholder inside report margin that represents NAME.
When that query has rows, show QUERY FIELD, so... NM_NAME, when no rows returned, so show :NAME.
I´m not getting point how can I syncronize this with my issue, to contour this, I can create one extra query (same as mine main query) that return the value when there is rows to return.
What is the best maner to fix it?
I hope that my explanation was plain.
Regards!

Answer 1

I should use functions from the SRW package in a format trigger:
1. Create a field in the margin (layout).
2. Give it a source . eg. 'mode' or ' desformat' (just any of the system parameters)
3. Create a format trigger on this field with code (eg.):
function F_1FormatTrigger return boolean is
begin
if :P_parameter = 'Yes' then
srw.set_field_char(0,:Name);
else
srw.set_field_char(0,'other text');
end if;
return (TRUE);
end;
Hope this helps,
regards, Bart