In PLSQL assigning from %rowtype with potentially inexistent columns

Question

In PL/SQL, I need to assign a variable with the value of a column provided a parameter of table%rowtype type.
The table in question is accessed using a database link, and the column I need to read may not exists.
A direct assignment (variable := parameter.column;) is not possible because the procedure will not compile if the column does not exists. As this is to be used as an interface mechanism, this procedure needs to compile whether the column exists or not.
I have tried dynamic SQL, but table%rowtype type for bind variables are not supported, the other method would be to have two function and check if they are valid before calling them, but this is messy.
Any other ideas?

Answer 1

This will not work. The procedure call will not compile if the column does not exists.
create procedure avdp
(pvar in emp%rowtype)
is
v_var varchar2(30);
begin
v_var := pvar.do_not_exists;
end;
create procedure avdp2
begin
avdp;
end;
Warning: Procedure created with compilation errors.
I can make it work using dynamic SQL to call the avdp procedure, but this is messy.
create procedure avdp2
is
v_count number;
begin
select count(*)
into v_count
from user_objects
where object_name='AVDP'
and status='VALID';
if v_count > 0 then
EXECUTE IMMEDIATE 'begin avdp; end;';
end if;
end;