Qsql and connection

[smemamian]

hi
I do not understand line 7 and 11,Please explain

#include <QCoreApplication>
#include <QtSql>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString servername = "LOCALHOST\\SQLEXPRESS" ;
    QString dbname = "test";
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setConnectOptions();
    QString dsn = QString("DRIVER={SQL Native Client);SERVER=%1;DATABASE=%2;Trusted_Connection=Yes;").arg(servername).arg(dbname);
    db.setDatabaseName(dsn);
 
    return a.exec();
}

#include <QCoreApplication>
#include <QtSql>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString servername = "LOCALHOST\\SQLEXPRESS" ;
    QString dbname = "test";
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setConnectOptions();
    QString dsn = QString("DRIVER={SQL Native Client);SERVER=%1;DATABASE=%2;Trusted_Connection=Yes;").arg(servername).arg(dbname);
    db.setDatabaseName(dsn);
    
    return a.exec();
}

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tnx