read rpm database with Java

Fri May 30 21:06:36 UTC 2014

Hi All,
   I need help how to read rpm packages with Java. I found that rpm
database is stored into Berkeley DB database and I can read the database
with Java. The biggest problem that I have is what query i need to make in
order to get for example all installed rpm packages? Where I can make this
information?

Please I need this information!

Br,
Peter
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