The internal structure of the database is currently private and unspecified. Querying the DB directly from another tool can't be done.

However, fetching data from the Jazz server through the supporting web interfaces should be possible. If you know the item_id of the thing you want to get, then you should be able to use the ItemRestService to get the item states through standard HTTP requests. Perhaps more details about what you are trying to do would make it easier to know if it can already be done.