Database Frame

The database frame uses the same execution flow as the client frame. Except that we ex-changed the Prolog agent for the Prolog driver. Again there is not much to say about the im-plementation of the database frame. It mirrors the implementation of the client frame. The Java class has only a different name, but the repertoire of the methods is the same. The sole differ-ence is that that we consult the Prolog driver instead of the Prolog agent.