studentdeatils inserted into database

int firstentry(){/*Enter your student details so they are saved in the database*/
cout << "Student ID"; cin >> studentID;
cout << "Name :"; cin >> name;
cout << "Surname :"; cin >> surname;
username = surname + name[0];
cout << "Enter your school email :"; cin >> email;
cout << "Password :"; cin >> password;
cout << "Enter Password again :"; cin >> retry;

if(retry == password){
  sqlite3 *db;
  char *column = 0;
  int load;
  string sql;
    
  load = sqlite3_open("School.db", &db);
    
  if(load){
    cout << "DB Error: " << sqlite3_errmsg(db) << endl;
    sqlite3_close(db);
    return(1);
    }
  sql = "INSERT INTO STUDENTDETAILS VALUES(" + studentID + ',' + name + ',' + surname + ',' + username + ',' + email + ',' + password + ");";

  load = sqlite3_exec(db, sql.c_str(), callback, 0, &column);
  sqlite3_close(db);

  cout << "Succesfully made your student login."<<endl;
  secondentry();