Possible to catch parameters exceptions in the program ?

Question

Hi,
Oracle 10g r2.
I have some procedures/functions like :
function insert_op (op_name in varchar2, op_date in date, op_length in number) is
begin
end;If I call for example :
insert_op('test','02/05/2010','hehe')I will get an error (invalid number). Normal.
My qyestion is, is it possible to catch that exception in the function ?
The fact is that my function is called from an input button in my apex application, so if user enter wrong values in the form, I can't catch the error except using Javascript.
Or should I pass all my parameters as varchar2, and then make functions to ckeck if it is valid numbers, dates, etc... :/
Thanks.
Yann.

Answer 1

function insert_op(op_length in number) return varchar2 is
temp number;
begin
temp := TO_NUMBER(op_length);
return 'ok it is a number';
exception
when others then return 'not a number';
end;Define the op_length as varchar2
create or replace function insert_op(op_length in varchar2) return varchar2 is
temp number;
begin
   temp := TO_NUMBER(op_length);
   return 'ok it is a number';
exception
when others then return 'not a number';
end;And further most important thing is dont use WHEN OTHERS. Use the specific exception. In this case VALUE_ERROR.
I have done such thing in the past. Here is that code.
create or replace function is_number(pVal in varchar2) return number
as
   lNum number;
begin
   lNum := to_number(pVal);
   return 1;
exception
   when value_error then
           return 0;
end;Edited by: Karthick_Arp on Mar 1, 2011 5:26 AM