Home Database Mysql Tutorial 验证ORA_CLIENT_IP_ADDRESS只在系统触发器中有效

验证ORA_CLIENT_IP_ADDRESS只在系统触发器中有效

Jun 07, 2016 pm 05:29 PM

ORA_CLIENT_IP_ADDRESS函数的功能是以VARCHAR2类型返回客户端IP地址,一般只用在系统触发器中,其实它也只在系统触发器中有效.经常

ORA_CLIENT_IP_ADDRESS函数的功能是以VARCHAR2类型返回客户端IP地址,一般只用在系统触发器中,其实它也只在系统触发器中有效.
 
经常看到有人说使用ORA_CLIENT_IP_ADDRESS获得的IP为空,大概也是这个原因造成的.
 
这里采用DDL触发器和系统触发器做对比.
 
首先准备实验用的表及两个触发器对象(一个DDL触发器,一个系统触发器)

--建立记录表
23:37:15 SYS@orcl> create table t01(id number,nn varchar2(40));
Elapsed: 00:00:00.05
--建立系统触发器
23:37:53 SYS@orcl> create or replace trigger ORA_TEST
23:38:16  2    after logon ON database
23:38:16  3  BEGIN
23:38:16  4    dbms_output.put_line(ORA_LOGIN_USER||'IP:'||NVL(ORA_CLIENT_IP_ADDRESS,'AA'));
23:38:16  5    insert into t01 select nvl(max(id),0)+1,ORA_LOGIN_USER||'[system Trigger]IP:'||NVL(ORA_CLIENT_IP_ADDRESS,'AA') from t01;
23:38:16  6  end;
23:38:17  7  /
Elapsed: 00:00:00.05
--建立DDL触发器
23:38:19 SYS@orcl> create or replace trigger ORA_TEST_ddl
23:38:38  2    after ddl ON database
23:38:38  3  BEGIN
23:38:38  4    dbms_output.put_line(ORA_LOGIN_USER||'IP:'||NVL(ORA_CLIENT_IP_ADDRESS,'AA'));
23:38:38  5    insert into t01 select nvl(max(id),0)+1,ORA_LOGIN_USER||'[DDL Trigger]IP:'||NVL(ORA_CLIENT_IP_ADDRESS,'AA') from t01;
23:38:38  6  end;
23:38:38  7  /
Elapsed: 00:00:00.11

其中特别加了ORA_LOGIN_USER来标识登录的用户,以及DDL Trigger和system Trigger字串来标识触发的是哪个触发器.

--先测试系统触发器,发现dbms_output.put_line没有输出
00:06:11 @orcl> conn cry/cry
Connected.
00:09:28 CRY@orcl> conn scott/tiger
Connected.
00:09:37 SCOTT@orcl> conn sys/ as sysdba
Connected.

此时的表t01为

00:09:40 SYS@orcl> select * from t01;

        ID NN
---------- ----------------------------------------
        1 CRY[system Trigger]IP:192.168.123.102
        2 SCOTT[system Trigger]IP:192.168.123.102
        3 SYS[system Trigger]IP:192.168.123.102
Elapsed: 00:00:00.02

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