Devi recuperare il campo effettivo da res . Ecco un semplice esempio che amplierai facilmente:
#include <stdlib.h>
#include <stdio.h>
#include <stdio.h>
#include <iostream>
#include <string>
#include <windows.h>
#include <mysql/mysql.h>
using namespace std;
static char *opt_host_name = "host"; /* HOST */
static char *opt_user_name = "user"; /* USERNAME */
static char *opt_password = "pass"; /* PASSWORD */
static unsigned int opt_port_num = 3306; /* PORT */
static char *opt_socket_name = NULL; /* SOCKET NAME, DO NOT CHANGE */
static char *opt_db_name = "database name"; /* DATABASE NAME */
static unsigned int opt_flags = 0; /* CONNECTION FLAGS, DO NOT CHANGE */
int main ()
{
MYSQL *conn; /* pointer to connection handler */
MYSQL_RES *res; /* holds the result set */
MYSQL_ROW row;
/* INITIALIZE CONNECTION HANDLER, DO NOT CHANGE */
conn = mysql_init (NULL);
/* THIS CONNECTS TO SERVER, DO NOT CHANGE ANYTHING HERE */
mysql_real_connect (conn, opt_host_name, opt_user_name, opt_password,
opt_db_name, opt_port_num, opt_socket_name, opt_flags);
/* show tables in the database (test for errors also) */
mysql_query(conn, "SELECT Password FROM Users WHERE Name = 'MY_NICKNAME'");
res = mysql_store_result(conn);
// get the number of the columns
int num_fields = mysql_num_fields(res);
// Fetch all rows from the result
while ((row = mysql_fetch_row(res)))
{
// Print all columns
for(int i = 0; i < num_fields; i++)
{
// Make sure row[i] is valid!
if(row[i] != NULL)
cout << row[i] << endl;
else
cout << "NULL" << endl;
// Also, you can use ternary operator here instead of if-else
// cout << row[i] ? row[i] : "NULL" << endl;
}
}
// DON'T FORGET TO CLEAN RESULT AFTER YOU DON'T NEED IT
// ANYMORE
if(res != NULL)
mysql_free_result(res);
/* disconnect from server */
mysql_close (conn);
system("pause");
return 0;
}
/* end main function */
