Function in report query builder

Question

Hi,
It is possible to call a function in the select statement of a report query builder as followed :
select my_func()
from my_table
The function is defined as :
create or replace my_func() return vachar2 is
v_temp vachar2(100);
begin
v_temp := 'column_1, column_2, column_3';
return(v_temp);
end;
Therefore, the query should be interpreted as:
select column_1, column_2, column_3
from my_table
and the fields "column_1", "column_2" and "column_3" with the same alias name would be created for the report.
Thank you,
DS

Answer 1

Ok. Here is the way!
Create user parameter p_query. Datatype Character. Width 10000. Set initial value as
select RPAD('n',10) c1, RPAD('n',10) c2, RPAD('n',10) c3 from dual
** Suppose type of column 1, 2 and 3 is character and maximum length can be 10. So using this in above select statement.
Get value in After Parameter Form trigger
begin
:p_query := yourfuntion;
return(true);
end;
data model will have only this:
&p_query
Now you will see three columns in data model
c1
c2
c3
NOW error ORA-24333 can appear, when function/procedure doesn't return back anything for data model, I mean lexical parameter p_query is empty.
** You can replace whole select statement with lexical parameter.