Re: Changing SQL statements inside the database

Thanks for the idea Tim but I am thinking about adding hints to the sql or changing the FROM table.

Yechiel Adar
Mehish

• Original Message ----- To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Thursday, May 02, 2002 4:48 PM

> The Virtual Private Database (VPD) facility (a.k.a. "fine-grain" or
> "row-level" security) can be used to alter SQL on the server, regardless
of
> origin. I implemented an access control list (ACL) feature for a system
two
> years ago, complete with recursion inside PL/SQL for navigating the
> (implied) double-dimensioned linked-lists that typical ACL functionality
> requires.
>
> Navigating linked-lists is naturally something that you wouldn't want to
> code in a SQL statement, but VPDs did it quite nicely by allowing me to
run
> a custom PL/SQL packaged function during the PARSE phase of a SQL
statement.
> The packaged function is supposed to return a string which is tacked onto
> the SQL statement, so you cannot "modify" existing text in the SQL, but
you
> can add additional SQL text to the WHERE clause, including subqueries.
> There are other little useful twists and tricks and gotchas involved, but
> that's the general idea...
>
> But, be *very* careful! You can just imagine how badly you can harm
> performance and accessibility through casual use of this feature... :-)
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Thursday, May 02, 2002 7:18 AM
>
>
> > Hello list
> >
> > This time I need your help on how to implement a weird idea.
> > We have a third party application that fire wasteful SQL's to the
> database.
> > (Remember the discussion on using x$dual Vs dual some days ago?)
> >
> > I am wondering: Is there a way to change the SQL that the user send?
> >
> > In ADABAS on the mainframe I can activate a user exit that gets the
> command
> > that
> > the user send to the database and change it (Not only can, but we are
> doing
> > it!).
> >
> > Is there a way to do the same with SQL in Oracle?
> >
> > In the server (preferably) or in the client.
> >
> > Thanks
> >
> > Yechiel Adar
> > Mehish
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Yechiel Adar
> > INET: adaryechiel_at_hotmail.com
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Tim Gorman
> INET: Tim_at_SageLogix.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Yechiel Adar
  INET: adaryechiel_at_hotmail.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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