Define variable in package access from trigger

Question

i want to accessing a variable that is defined in the package from trigger..how i must define this variable in the package ?

Answer 1

To add one more point to Justin,
Package variables are global variables. If you want to make it local to single call use PRAGMA SERIALLY_REUSABLE.
create or replace package pkg_variable
as
      g_var number := 1;
end;
create or replace package pkg_variable_local
IS
PRAGMA SERIALLY_REUSABLE;
      g_var number := 1;
end;
/ Testing Above Two pakcages
set serveroutput on
begin
  dbms_output.put_line ( 'Test 1 :');
  dbms_output.put_line ( 'Global Var: ' || pkg_variable.g_var); 
  dbms_output.put_line ( 'Local  Var: ' || pkg_variable_local.g_var);
end; 
Result:
Test 1:
Global Var : 1
Local Var : 1
begin
  pkg_variable_local.g_var := 10;
  dbms_output.put_line ( 'Test 2 :');
  dbms_output.put_line ( 'Global Var: ' || pkg_variable.g_var); 
  dbms_output.put_line ( 'Local  Var: ' || pkg_variable_local.g_var);
end; 
Result:
Test 2:
Global Var : 10
Local Var : 10
begin
  dbms_output.put_line ( 'Test 3 :');
  dbms_output.put_line ( 'Global Var: ' || pkg_variable.g_var); 
  dbms_output.put_line ( 'Local  Var: ' || pkg_variable_local.g_var);
end; 
Result:
Test 3:
Global Var : 10
Local Var : 1
But remember, Serially reusable packages cannot be accessed from database triggers.