如何通过DB link进行远程过程或函数调用

有朋友在留言板问:如何通过动态sql远程调用包里面的函数，并返回值。
我简单做了一个例子，实现以上要求.
首先进行适当授权：

[oracle@jumper oracle]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Tue Nov 7 21:07:56 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> grant create public database link to eygle;
Grant succeeded.
SQL> grant all on dbms_flashback to eygle;
Grant succeeded.

建立DB Link:

SQL> connect eygle/eygle
Connected.
SQL> create public database link hsbill using 'hsbill';
Database link created.
SQL> select db_link from dba_db_links;
DB_LINK
---------------------------------------------------
HSBILL
SQL> select * from dual@hsbill;
D
-
X

此后可以尝试使用DB Link进行远程和本地执行:
SQL> set serveroutput on
SQL> set feedback off
SQL> declare
2 r_gname varchar2(40);
3 l_gname varchar2(40);
4 begin
5 execute immediate
6 'select GLOBAL_NAME from global_name@hsbill' into r_gname;
7 dbms_output.put_line('gname of remote:'||r_gname);
8 select GLOBAL_NAME into l_gname from global_name;
9 dbms_output.put_line('gname of locald:'||l_gname);
10 end;
11 /
gname of remote:HSBILL.HURRAY.COM.CN
gname of locald:EYGLE
远程Package或Function调用也可以随之实现:
SQL> declare
2 r_scn number;
3 l_scn number;
4 begin
5 execute immediate
6 'select dbms_flashback.GET_SYSTEM_CHANGE_NUMBER@hsbill from dual' into r_scn;
7 dbms_output.put_line('scn of remote:'||r_scn);
8 end;
9 /
scn of remote:18992092687
SQL>
-The End-