How to refer a packaged variable

Question

Hi,
I have gone through the forum where it mentions how to refer a constant in a package.I want to refer a variable declared in package spec.
CREATE OR REPLACE PACKAGE p1
IS
sDebugMode VARCHAR2(3) := 'ON';....
end;

Answer 1

user8731258 wrote:
I have gone through the forum where it mentions how to refer a constant in a package.I want to refer a variable declared in package spec.
CREATE OR REPLACE PACKAGE p1
IS
sDebugMode VARCHAR2(3) := 'ON';
end;
In order to use PL/SQL variables (including global static variables), a SQL needs to be created with bind variables. This requires the use of PL/SQL itself. The following is thus valid:
create or replace procedure GetFooCursor( cur out sys_refcursor ) is
begin
  --// PL/SQL creates a SQL bind variable and bind it using
  --// the PL/SQL variable
  open cur for select * from foo_table where foo_switch = p1.sDebugMode;
end;However, you cannot do the following using SQL only:
SQL> select * from foo_table where foo_switch = p1.sDebugMode;The SQL engine needs to resolve what "+p1.sDebugMode+" refers to. The SQL engine only support calling PL/SQL functions. It is not capable of looking inside the PL/SQL engine's memory and access PL/SQL variables directly.
So if you want the SQL engine to access that variable directly, you need to create a PL/SQL function that returns the variable value. Which is not really a great approach:
create or replace function SillyFunc return varchar2 is
begin
  return( p1.sDebugMode );
end;The following SQL can then be used:
SQL> select * from foo_table where foo_switch = SillyFunc();