How to Write a trigger to hold session data

Hi Everyone,
There are 4 Weblogic Servers which are connected to the database concurrently. In the database I have Application Users table "USERS". When a user is logged to the application let us say userA(from "USERS" table) is logged into the application, whenever that same userA logged into the application from other Weblogic server(other system) it should not allow to login into the application. Is it possible to write a trigger for this. If possible, Can any body suggest how to write a trigger to hold that UserA data into one temporary table as long as that userA is active and removes the data from temporary table when userA logged off (OR) as well as that Weblogic server is goes down.
Thanks in advance.

Hi Justin,
First Thank you very much to all of you.
1. Yes Application Users are authenticated only once,
that to at the time of login to the Application.
2. We are not running any script that informing the
message like "connections
from the downed server should be reset". Do you
you think is it suggestable.
It's not mandatory to use triggers only.Can we
achieve this by maintaining any temporary table.
I have one idea is that, Lets create a table name
e "App_Users_Session_Data(User_Id,Is_Active)"
If "User A" logins into the application then User_Id
= 1A and Is_Active = 'T' will be entered
automatically into the table
"App_Users_Session_Data". When same "UserA" logins
from other Weblogic Server then Application first
check this table and informing that "UserA" already
logins and is active.
Whenever "UserA" loggsoff then this entry will be
automatically deleted.
My doubt is "UserA" logins successfully into the
application and corresponding user entry is there in
"App_Users_Session_Data". If Weblogic Server goes
down from where this UserA logins, This entry will
not be deleted. If this entry is still there then the
same UserA should not login into the application from
the same Weblogic server(which is up again). My doubt
is how to remove this entry automatically when
Weblogic server goes down. Can we achieve this by any
other way. If possible can u give some guidelines
thats enough for me.
Thank you everyone
SankarHi,
First off all and as I undeerstood you can change your application.
1- A table say weblogic_servers have to be created:
Several scenarios are possibles. If you want you can have a row per weblogic server in this table with what you want as identifier. Any way this table can have a column (sid for example) which identifies the weblogic database session. This can be managed by logon and logoff triggers for the related database user. The logoff trigger for example deletes all lines in App_users_Sessions_Data (see below) related to the same session as the weblogic server and puts the session sid in weblogic_servers to NULL.
2- Change the table App_Users_Session_Data:
You have to add a column (sid for example) linking the app user to the database session of the weblogic server. When a user connects, you can check if the databse session is always there and decide accordingly.
A good idea in my opinion is to centralize your logic by putting it in an INSERT trigger on App_Users_Session_Data.

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CREATE GLOBAL TEMPORARY TABLE GLOBAL_TEMP
EMP_C_NAME VARCHAR2(20 BYTE)
ON COMMIT PRESERVE ROWS;
CREATE OR REPLACE TRIGGER TRI_GLOBAL_TEMP
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EMP_C_NAME
fgfdgd
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fgfdgd
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Chris
Message was edited by: Per Krabsetsve

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und
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in the source code of ur function module.
if
like this u can code .
now when u call the function module in tme mainprogram.
if some error occurs and u have declared a exception for this then it will set sy-subrc = value u give inthe call of this fm.
in the fm u can program these sy-subrc values and trigger the code for ur exception.
Please reward if useful
Regards,
Ravi
Edited by: Ravikanth Alapati on Mar 27, 2008 9:36 AM

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