typedef std::vector<std::string> DatabaseRow;
std::vector<DatabaseRow*> data;

//getting data from database
//(dont need this for this example)

//then print first entry out
printf("%s.n",dbresult.data[0][0].c_str());

(*dbresult.data[0])[0]

std::vector<DatabaseRow*> data;
                       ^ Pointer

(*dbresult.data[0])[0].c_str()

std::vector<DatabaseRow> data;