“Boolean” parameter for Oracle stored procedure

Question

I\'m aware that Oracle does not have a boolean type to use for parameters, and am currently taking in a NUMBER type which would have 1/0 for True/False (instead of the \'Y\'

Answer 1

Yes and no. You can do..

create or replace package t_bool is
  subtype t_bool_num IS PLS_INTEGER RANGE 0..1;
  function f_test (i_bool_num t_bool_num) return varchar2;
end t_bool;
/

create or replace package body t_bool is
  function f_test (i_bool_num t_bool_num) return varchar2 is
  begin
    if i_bool_num = 0 then 
      return 'false';
    elsif i_bool_num = 1 then
      return 'true';
    elsif i_bool_num is null then
      return 'null';
    else
      return to_char(i_bool_num);
    end if;
  end;
end t_bool;
/

The good news is that, if you do

exec dbms_output.put_line(t_bool.f_test(5));

it reports an error.

The bad news is that if you do

select t_bool.f_test(5) from dual;

then you don't get an error