Oracle from DB2 federation - function mapping

Question

I need to map an Oracle function (instr) from an InfoSphere function (postion) from the DB2 database, so this is more of a DB2 question, but never could get an answer out of DB2ools ;-)
I have created the wrapper, server, user mapping and nicknames in DB2, but need to create a function mapping in DB2 between their "position(search, source, code) to our instr(search, source). This is a mapping of system functions, so I am not sure if it is possible... and their documentation is kludgy at best. The problem is this: POSITION(search, source, code), where code represents UTF-16, UTF-32 or code page translation. I want to force this syntax to pass to Oracle as INSTR(search, source), dropping their 'code'.
This is the only function that does not work properly from the DB2 side to us. If anyone has the DB2 create function mapping command to do the above, my appreciation for the answer and condolences that you actually had to go thru the reams of IBM documentation.

Answer 1

Addendum ...
OK I found what the DIGIT function does.
I am not sure if there is a function in Oracle that maps directly to DIGIT function in DB2
but you can do something like this:
select lpad(replace(to_char(abs(n)),'.'),
(select to_number(data_precision) from user_tab_columns where table_name = 'A' and column_name = 'N'),'0')
from a
In the SQL above n is the column in table A. Data_precision column gets the size of the column.
Option 2:
You could write your own function in Oracle to do what the SQL above does
create or replace function digit (col_val in number, col_name IN varchar2, tab_name IN varchar2) return varchar2
as
v_val varchar2(100);
v_prec number;
begin
select to_number(data_precision) into v_prec from user_tab_columns where table_name = upper(tab_name) and column_name = upper(col_name);
v_val := lpad(replace(to_char(abs(col_val)),'.'),v_prec,'0');
return v_val;
end;
Then use the function as follows:
select digit(n,'N','A') from a
Shakti
http://www.impact-sol.com
Developers of Guggi Oracle - Tool for DBAs and Developers
Message was edited by:
skgoel