Trying to handle the error messge with a forced disconnect

Question

I have an after logon trigger with the following code, this is trying to disconnect a user if they have logged onto discoverer 4i too many times (value held in a table).
the trigger is working ok and does not allow then to connect, however it exits with these errors
"Authentication Failed.
(Failed to connect to database - ORA-00604: error occurred at recursive SQL level 1 ORA-20998: Too many discoverer sessions, please try later. ORA-06512: at line 38 ) "
I would like to just show the raised ORA-20998: Too many discoverer sessions, please try later. error, is this possible?
I am trying this on 8.1.7.4, but do have access to 9.2.0.8 if that helps.
create or replace trigger COM_DISCOVERER_SESSIONS
after logon on database
DECLARE
V_USER VARCHAR(10);
V_SESSIONS NUMBER(3);
V_CONTROL NUMBER(3);
V_Q_SESS NUMBER(3);
V_OTH_SESS NUMBER(3);
BEGIN
      SELECT upper(SYS_CONTEXT('USERENV', 'SESSION_USER'))
      INTO V_USER
      FROM DUAL; 
                SELECT COUNT(*)
                  INTO V_SESSIONS
                  from COM_DISC_LOGINS
                  where UPPER(USERNAME) = V_USER;
                  IF V_SESSIONS = 0 THEN
                    NULL;
                  ELSE
                      SELECT SCH_USER_CONTROL, SCH_DISC_Q_SESSIONS, SCH_DISC_OTH_SESSIONS
                      INTO V_CONTROL, V_Q_SESS, V_OTH_SESS
                      FROM COM_SCHEMES;
                      IF (V_CONTROL = 1 
                            AND SUBSTR(V_USER,1,2) IN ('WO','PR','ED','SW','WQ','PQ'))
                       OR (V_CONTROL IN (2,3)  
                            AND (SUBSTR(V_USER,1,2) IN ('WO','PR','ED','SW')
                                AND V_SESSIONS >= V_OTH_SESS )
                            OR (SUBSTR(V_USER,1,2) IN ('WQ','PQ') 
                                 AND V_SESSIONS >= V_Q_SESS)) THEN
                               Raise_application_error(-20998, 'Too many discoverer sessions, please try later.');     
                              EXECUTE IMMEDIATE 'DISCONNECT';
                      END IF;
                  END IF;
END;Message was edited by:
Kers

Answer 1

Is notify() a standard method in all objects in Java?Yes, as are notifyAll() and wait(). You'll also notice in the API that there already is an Observer interface and an Observable object. That's probably sufficient to implement what you want to do.
Brian