带你轻松接触Oracle DBLink的简单运用

在这个示例中，我们首先做了一个例子，目的是实现以上要求.

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.

然后建立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

在此之后我们可以尝试使用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-