Qsql and connection

[smemamian]

thanks a lot .

Why do I get the error message when I compile ?

QsqlDatabase: QODBC driver not loaded
QSqlDataase : available drivers:QSQLITE

my code :

#include <QCoreApplication>
#include <QtSql>
#include <QDebug>
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);
 
    if(db.open())
    {
        qDebug() << "Opene.." ;
    }
 
    else
        qDebug() << "Not Opene.." << db.lastError();
 
    return a.exec();
}

#include <QCoreApplication>
#include <QtSql>
#include <QDebug>
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);

    if(db.open())
    {
        qDebug() << "Opene.." ;
    }

    else
        qDebug() << "Not Opene.." << db.lastError();
    
    return a.exec();
}

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Microsoft SQL Server 2008
Windows 7