establish db connection on app start, not on route

server.cpp

@@ -6,19 +6,29 @@
 using namespace sql;
 using namespace std;
 
+Driver *driver;
+Connection *con;
+Statement *stmt;
+
+void exiting(){
+	delete con;
+	delete stmt;
+}
+
 int main()
 {
 	crow::SimpleApp app;
 
-	CROW_ROUTE(app, "/seconds")([](){
-		Driver *driver = get_driver_instance();
-		Connection *con = driver->connect(getenv("DBURL"),getenv("DBUSER"),getenv("DBPWD"));
+	driver = get_driver_instance();
+	con = driver->connect(getenv("DBURL"),getenv("DBUSER"),getenv("DBPWD"));
 	con->setSchema("timer_backend");
-		Statement *stmt = con->createStatement();
-		ResultSet *res = stmt->executeQuery("SELECT * FROM sessions;");
+	stmt = con->createStatement();
 
+	CROW_ROUTE(app, "/seconds")([](){
 		crow::json::wvalue entries;
 
+		ResultSet *res = stmt->executeQuery("SELECT * FROM sessions;");
+
 		int i = 0;
 		while (res->next()) {
 			int id = res->getInt("id");
@@ -29,12 +39,11 @@ int main()
 		}
 
 		delete res;
-		delete stmt;
-		delete con;
-
 		return entries;
 	});
 
 	app.port(18080).run();
+
+	atexit(exiting);
 }