How to pass the context from Portal to Database for fine grain access?

Hi,
I am developing an omniportlet and I need to pass on the context of the logged in user to the database so that when the user tries to access data in the omniportlet, he can see data relevant to him only. Does anyone know how to do that?
I have set up a light weight user scott and also has a schema in the database by the same name (scott)..
what I am trying is when the user logs in as scott in the portal site and runs an omniportlet, he should be dynamically be logged in to scott the schema so that the data visible to him can be restricted. Same should happen for other users as well.
Does anyone know in which table in the PORTAL schema is this connection information stored, so that I can override it using some API..?
Thanks,
Abhi

I had tried sending the user_name in the sql and that works fine. but my requirement is that the user should login to his schema and only his schema directly and automatically.. such that even if an omniportlet is created using some default schema, when user logs in he can access only the schema meant for him..
e.g. While running the omniportlet when logged-in as user scott, he should be logged-in to scott schema in the database, so that the fine grain access can be enabled ..
Edited by: user6386347 on Mar 12, 2009 12:15 PM

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