login and select

int secondentry(){ /*login your details and check to see if they match the database*/
cout << "Please enter your student details to Login :" <<endl;
cout << "Username/Email :"; cin >> log1;
cout << "Password Please :" <<endl; cin >> pass1;
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 = "SELECT password FROM STUDENTDETAILS " + username + ";";
load = sqlite3_exec(db, sql.c_str(), callback, 0, &column);

if (pass1 == sql){
  cout << "Successfull Login" <<endl;
  Timetablesforstudent();
}
else{
  cout << "Please try again" <<endl;
  secondentry();
}
return 0; // need to return 0/1 depending on the output 

}