User function

Question

To get the user id in the current session, I can normally do this in a stored procedure:
select user into parm_user_ID from dual;
But now I need to do the following, instead:
1) A user id p_uid is passed as a parameter from the "front end" such as from the browser;
2) Set the user id to the session or a global variable holder
3) Get the user id from any function in the current session
4) Use it in a SQL such as:
select user_name into username from user_table where user_id = p_uid;
If this is in the same procedure where the p_uid is passed, then it would not be a problem. But I want to access the p_uid from ANY function in the current session when in need. That is why I need to set it either in the session or a global variable. I prefer to set it to the session, then retrieve it from the session later in need. But how to do it?
Thanks

Answer 1

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But now I need to do the following, instead:
1) A user id p_uid is passed as a parameter from the "front end" such as from the browser;
2) Set the user id to the session or a global variable holder
3) Get the user id from any function in the current session
4) Use it in a SQL such as:
select user_name into username from user_table where user_id = p_uid;
If this is in the same procedure where the p_uid is passed, then it would not be a problem. But I want to access the p_uid from ANY function in the current session when in need. That is why I need to set it either in the session or a global variable. I prefer to set it to the session, then retrieve it from the session later in need. But how to do it?
>
That's what CONTEXTs are designed for.
See CREATE CONTEXT in the SQL Language doc
http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_5002.htm
The example at the end shows how to create and use them. It refers you to this link for how to create the requisite procedure.
http://docs.oracle.com/cd/B28359_01/network.111/b28531/app_context.htm#DBSEG66353
You can create a CONTEXT that is SESSION specific or one that is GLOBAL and whose variables can be accessed by any session.
http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_5002.htm
You could also create a LOGON trigger that sets any standard set of variables into the context for you.