15     std::string database;

    15     std::string database;

    16     std::string password;

    16     std::string password;

    17     std::string server;

    17     std::string server;

    18 

    18 

    19   public:

    19   public:

    22     virtual bool connect () = 0;

    21     virtual bool connect () = 0;

    23     virtual std::vector < std::vector<std::string> >query (std::string) = 0;

    22     virtual std::vector < std::vector<std::string> >query (std::string) = 0;

    24 };

    23 };

    25 #endif

    24 #endif