Controlling access to Oracle Mapviewer spatial data through VPD

I am building a web GIS application in Oracle Application Express (APEX) and have used the Virtual Private Database feature of Oracle Database 11g Enterprise Edition so as to ensure row level security. I've integrated APEX with Oracle Mapviewer through Oracle Maps API in order to display a map.
VPD feature is working properly through the command prompt at the database level but I also need to use the VPD policy at the application level so that each authenticated user can only see his own spatial data on the map.
So far I have accomplished that by creating as many data sources as the number of application users on the mapViewerConfig.xml file. Every time a user logs in the web GIS application, the correct data source is being employed.
I was wondering if there is any other parameterised way that I can perform this access control functionality without having to create all these data sources.
Many thanks in advance.

Yes you can define a single "secure" MapViewer data source to achieve VPD or make use of your database VPD setup. For more details and how to get the Apex app user to MapViewer and then onto VPD you can check out my blog post here: http://oraclemaps.blogspot.com/2008/09/apex-oracle-maps-and-secure-mapping.html
hope this helps,
LJ

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