User access to database within limits of time

:C:\Documents and Settings\Administrator>sqlplus "/as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Tue Jul 28 14:56:58 2009

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Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> create user shahid identified by shahid;

User created.

SQL> grant connect, resource to shahid;

Grant succeeded.

SQL> conn shahid/shahid
Connected.
SQL> disc
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Pr
oduction
With the Partitioning, OLAP and Data Mining options
SQL> conn / as sysdba
Connected.
SQL> CREATE OR REPLACE TRIGGER limit_connection
2 AFTER LOGON ON DATABASE
3 BEGIN
4 IF USER = 'SHAHID' THEN
5 IF to_number(TO_CHAR (SYSDATE, 'hh24')) BETWEEN 8 AND 22
6 THEN
7 RAISE_APPLICATION_ERROR(-20998,' Dear user 'USER'! You can''t login between 08 and 22');
8 END IF;
9 END IF;
10 END limit_connection;
11 /

Trigger created.

SQL> select to_char(sysdate,'hh24') from dual;

TO
--
23

SQL> conn shahid/shahid
Connected.
SQL> select to_char(sysdate,'hh24') from dual;

TO
--
18

SQL> conn shahid/shahid
ERROR:ORA-00604: error occurred at recursive SQL level 1ORA-20998: Dear user SHAHID! You can't login between 08 and 22ORA-06512: at line 5 Warning: You are no longer connected to ORACLE.SQL>