Simple trigger to allow users to log on at certain times

Question

I am trying to create a trigger that will allow certain users to only log into the database between 12am - 4 am.
Can I assign a trigger to a user or to a role or how do I parse it out. I dont think I have this trigger just right yet...
Or can this be set in the database it self? I looked at the user accounts, profiles, roles and dont see anything about connection times.
Oracle 10.2.0.4
I want to create a trigger that will only allow the user to log into the database between 12 and 4 am.
My next question is can I assign this trigger to the role that the user has been assigned to?
I have pulled some similar code that I would like to use but do not know how to modify it to be either assigned to a user: npq or to the role ntq_ro.
create or replace trigger logon_time after logon on database
begin
if to_char(sysdate,'HH24') between 4 and 24
then
raise_application_error(-20001,'Not allowed to logon database during this time');
end if;
end
/

Answer 1

yes, I would love to all by command line...
Bere in mind I change to to test...
SQL> CREATE OR REPLACE TRIGGER "SYS".LOGON_TIME_RESTRICTION_NPQ AFTER
2 LOGON ON DATABASE
3 BEGIN
4 if to_char(sysdate,'HH24') between '14' and '16' AND USER='NPQ' THEN
5 raise_application_error(-20001,'Not allowed to logon database during this time');
6 end if;
7 end;
8 /
Trigger created.
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@kali ~]$ sqlplus
SQL*Plus: Release 10.2.0.4.0 - Production on Mon Jan 10 14:41:02 2011
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Enter user-name: npq
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Alert log triggered errors:
Mon Jan 10 14:41:10 2011
Errors in file /u01/app/oracle/admin/NASARPT/udump/nasarpt_ora_17508.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-20001: Not allowed to logon database during this time
ORA-06512: at line 3
/u01/app/oracle/admin/NASARPT/udump/nasarpt_ora_17508.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1
System name: Linux
Node name: kali.mtsallstream.com
Release: 2.6.18-164.6.1.el5
Version: #1 SMP Tue Oct 27 11:28:30 EDT 2009
Machine: x86_64
Instance name: NASARPT
Redo thread mounted by this instance: 1
Oracle process number: 31
Unix process pid: 17508, image: [email protected] (TNS V1-V3)
*** ACTION NAME:() 2011-01-10 14:41:10.293
*** MODULE NAME:([email protected] (TNS V1-V3)) 2011-01-10 14:41:10.293
*** SERVICE NAME:(SYS$USERS) 2011-01-10 14:41:10.293
*** SESSION ID:(54.49496) 2011-01-10 14:41:10.293
Skipped error 604 during the execution of SYS.LOGON_TIME_RESTRICTION_NPQ
*** 2011-01-10 14:41:10.293
ksedmp: internal or fatal error
ORA-00604: error occurred at recursive SQL level 1
ORA-20001: Not allowed to logon database during this time
ORA-06512: at line 3
I also tried the setting for the to_num but it would not even compile:
SQL> CREATE OR REPLACE TRIGGER "SYS".LOGON_TIME_RESTRICTION_NPQ AFTER LOGON ON DATABASE
2 BEGIN
3 if to_num(to_char(sysdate,'hh24miss')) between '000001' and '040000' AND USER='NPQ' then
4 raise_application_error(-20001,'Not allowed to logon database during this time');
5 end if;
6 end;
7 /
Warning: Trigger created with compilation errors.
SQL>