NVARCHAR2 constants in package specification - oracle

Question

I try to add a constant in package specification with nvarchar2 datatype but after compilation it stores in database something like ???. For example I try to add a constant for armenian word մեկ
x constant nvarchar2(3) default 'մեկ';
Can anyone suggest a solution to this problem or it is impossible to do so?

Answer 1

I have tested you example on two different databases with different NLS_CHARACTERSET configurations.
Configurations (recived by query -
select *
from v$nls_parameters
where parameter in ('NLS_NCHAR_CHARACTERSET','NLS_CHARACTERSET','NLS_LANGUAGE')
):
First:
+----+------------------------+----------+
| id | PARAMETER | VALUE |
+----+------------------------+----------+
| 1 | NLS_LANGUAGE | AMERICAN |
| 2 | NLS_CHARACTERSET | AL32UTF8 |
| 3 | NLS_NCHAR_CHARACTERSET | AL16UTF16|
+----+------------------------+----------+
Second:
+----+------------------------+-------------+
| id | PARAMETER | VALUE |
+----+------------------------+-------------+
| 1 | NLS_LANGUAGE | RUSSIAN |
| 2 | NLS_CHARACTERSET | CL8MSWIN1251|
| 3 | NLS_NCHAR_CHARACTERSET | AL16UTF16 |
+----+------------------------+-------------+
And the result is following, on DB with charset AL32UTF8 variable displays correctly, on charset CL8MSWIN1251 with questions '???'.
I haven't change charsests on databases to validate my suggestion. So I suggest you change NLS_CHARACTERSET to AL32UTF8 it should help.
My package for tests:
create or replace package question27577711 is
x constant nvarchar2(3) default 'մեկ';
function get_constant_x return nvarchar2;
end question27577711;
create or replace package body question27577711 is
function get_constant_x
return nvarchar2
is
begin
return x;
end get_constant_x;
end question27577711;
select question27577711.get_constant_x from dual