int HB_insert(DB &db, Package package) { //int opt = package.operation();//opt not be used? string package_str = package.SerializeAsString(); int ret = db.set(package.virtualpath(), package_str); //virtualpath as key if (ret == 0) { return -3; //insert fail. } /* cout << "String insted: " << package_str << endl; */ return 0; }