Why am I not being able to connect to my database? - c++

Question

I've followed numerous tutorials to the tee, yet I still cannot connect to my database from Qt. I always get this error:
Closed! "[Microsoft][ODBC SQL Server Driver][DBMSLPCN]SQL Server does not exist or
access denied. [Microsoft][ODBC SQL Server Driver][DBMSLPCN]ConnectionOpen
(Connect()). [Microsoft][ODBC SQL Server Driver]Invalid connection string attribute
QODBC3: Unable to connect"
or if I use SQL NATIVE CLIENT (i.e. instead of SQL SERVER) as the DRIVER, I get the following error:
Closed! "[Microsoft][ODBC Driver Manager] Data source name not found and no default
driver specified QODBC3: Unable to connect"
Been sitting here for hours trying to figure this out, but I can't see what I'm doing wrong. The server, database, etc all seem to have the right names. I just don't see why it's not connecting.
Code below
#include "login.h"
#include "ui_login.h"
login::login(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::login)
{
ui->setupUi(this);
QSqlDatabase db = QSqlDatabase::addDatabase ("QODBC","Chessgames");
db.setConnectOptions();
db.setDatabaseName("DRIVER={SQL SERVER};SERVER=MYNAME\\SQLEXPRESS;DATABASE=Chessgames;Uid=sa;Password=xxxxx;");
if(db.open())
{
qDebug() << "Opened!";
db.close();
}
else
{
qDebug() << "Closed! " << db.lastError().text();
}
}
login::~login()
{
delete ui;
}

Answer 1

Got it to open by changing the hostname to the ip address and port.
db.setDatabaseName("DRIVER={SQL SERVER};SERVER=192.168.X.X;Port=port#;
DATABASE=Chessgames;Uid=sa;Password=xxxxx;");