diff --git a/db_bridge/include/abstract_db.h b/db_bridge/include/abstract_db.h
--- a/db_bridge/include/abstract_db.h
+++ b/db_bridge/include/abstract_db.h
@@ -17,10 +17,9 @@
     std::string server;
 
   public:
-    typedef std::vector < std::vector<std::string> > DB_RESULT;
-    typedef std::vector<std::string> DB_ROW;
+    typedef std::vector < std::vector <std::string> >DB_RESULT;
+    typedef std::vector <std::string> DB_ROW;
 
-    virtual ~ Abstract_DB () {}
     virtual bool connect () = 0;
     virtual DB_RESULT query (std::string) = 0;
 };