Added use_postgres arg

src/main.cpp

@@ -554,6 +554,8 @@ int main(int argc, char *argv[]) {
 
     AGGenInstance _instance;
     //the following five assignments to _instance's members are all from db_function.cpp
+    //the following five assignments are only applicable when use_postgres is set to true
+    if (use_postgres) {
         _instance.facts = fetch_facts();
         //The above function call returned an Keyvalue object and assigned the object to facts. The object mainly contains hash table and string vector based on all initial property and value.
         //the following 4 lines can be used to check the content of the facts. It is based on the initial property and value from table quality, postcondition and topology.
@@ -568,7 +570,12 @@ int main(int argc, char *argv[]) {
         _instance.assets = fetch_all_assets(_instance.facts); //fetch each asset name and its related qualities. 
         _instance.exploits = fetch_all_exploits(); //fetch each exploit and its precondition and post conditions from initial exploits
         auto ex = fetch_all_exploits(); //make a copy of initial exploits
-
+    }
+    else {
+        std::cout << parsednm << std::endl;
+        std::cout << "Not yet implemented." << std::endl;
+        return(1);
+    }
     std::cout << "Assets: " << _instance.assets.size() << "\n"; //# of assets, vector size
     std::cout << "Exploits: " << _instance.exploits.size() << "\n"; //# of exploits, vector size
     std::cout << "Facts: " << _instance.facts.size() << "\n"; //how many different parameters and values are there? class size() method