Strange Behavior: VO query result shown in UI different from backend

Question

Hi Experts,
I have an issue with one of the VOs in my application. The VO uses an expert query.
The application uses ADF faces for the front end. The UI is created by dragnDrop method from ViewCriteria(Datacontrol for this VO) to the page.
I would expect the page to always show the data which I would get when I execute the query from the backend.
But the data that comes up in the UI(through the VO and queryPanel, af:table) is different from the data set if I execute the query directly from backend. (Oracle 11G Database)
The issue occurs for one set of data and not for another set of data.
I tried the following:
In VOImpl, the executeQuery method is overridden to add additional filters.
Just before super.executeQuery, captured the getQuery() result.
The query got this way, I am running from back-end(SQLPLUS/Toad) returns expected results, whereas when the Application is run, the UI table shows duplicate data for one set alone.
Please share pointers on how to debug this issue further.
Please note that this post is not about the query but I am illustrating the query here just in case its needed.
The query is something like this:
Fetch rows from maintable that belong to either the set mapping to :bindvariable1 or the set mapping to bindvariable2. This could be represented as a union between the two selects as well.
select
col1,col2,col3...
from main_table, table1, table2
where
(main_table.idcolumn =:bindvariable1
and table1.referencecolumn =:bindvariable1
and table2.referncecolumn =:bindvariable1)
or
(main_table.idcolumn =:bindvariable2
and table1.referencecolumn =:bindvariable2
and table2.referncecolumn =:bindvariable2)
and
maintable.idcolumn2=table1.idcolumn
and maintable.idcolumn3=table2.idcolumn
Thanks for your time and help.
Ganesh Iyer

Answer 1

Do you have a security policy associated with the table?
Oracle 8i supports virtual private database where the server can dynamically modify a query.
The query 'SELECT * FROM EMP' could be modified by the server to 'SELECT * FROM EMP WHERE DIVISION = 'AIRCRAFT' by putting a security policy on the EMP table.
You, as a user, would never know it happened.
A security policy based on some arcane rule such as the time of day could cause the problem you are describing.
The only other way I know of is if you logged in as two different users and each user has different privileges on the table.
Good luck!
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