Accessing a packaged variable through db link

Question

How do I access a packaged variable remotely? (Syntax)

Answer 1

You cannot do that:
SQL> conn xx/xx@xx
Connected.
SQL> create package p is
  2   a number;
  3  end;
  4  /
Package created.
SQL> conn yy/yy@yy
Connected.
SQL> desc p@yy
SQL> set serveroutput on
SQL> create synonym p1 for p@xx;
Synonym created.
SQL> desc p1;
SQL> begin
  2    p1.a := 1;
  3    dbms_output.put_line(p.a);
  4  end;
  5  /
  p1.a := 1;
ERROR at line 2:
ORA-06550: line 2, column 6:
PLS-00512: Implementation Restriction: 'P1.A': Cannot directly access remote package variable or cursor
ORA-06550: line 2, column 3:
PL/SQL: Statement ignoredInstead you should access these variables via functions and/or procedures. In following example I've created the private variable in package p but this doesn't matter whether it is private or public.
SQL> conn xx/xx@xx
SQL> create or replace package p is
2 procedure set_a (v in number);
3 function get_a return number;
4 end;
5 /
Package created.
SQL> ed
Wrote file afiedt.buf
1 create or replace package body p is
2 a number;
3 procedure set_a (v in number) is
4 begin
5 a := v;
6 end;
7 function get_a return number is
8 begin
9 return a;
10 end;
11* end;
SQL> /
Package body created.
SQL> conn yy/yy@yy
Connected.
SQL> set serveroutput on
SQL> desc p1
FUNCTION GET_A RETURNS NUMBER
PROCEDURE SET_A
Argument Name Type In/Out Default?
V NUMBER IN
SQL> ed
Wrote file afiedt.buf
1 begin
2 p1.set_a(1);
3 dbms_output.put_line(p1.get_a);
4* end;
SQL> /
1
PL/SQL procedure successfully completed.
Gints Plivna
http://www.gplivna.eu