title: Room - Using external SQLites as well as internal DB
body: <p>At our company, we are currently evaluating switching to Room for managing our mobile devices databases. The main reasons we want to do that is because of inheritance support and increased testability.</p>
  
  <p>Currently, we are using GreenDao to access an internal database (on which the session data, settings, user data and similar things are stored) and to access our external databases (sqlites that we retrieve from an FTP-Server and store in subfolders in <code>/sdcard/Android/app-folder/</code>; these provide the data we use in our business logic).</p>
  
  <p><strong>What we need:</strong> We need to be able to use attach the external databases to the internal Room-Database without changing the path they are stored in. After adding them, we want to be able to use the databases with the Room Entity, Dao and Database objects.
  Is there any possible way to achieve this?</p>
  
  <p><strong>Room-Version:</strong> 1.1.1 (Support-Libraries)</p>
  
  <p><strong>API-Level:</strong> 15</p>