Error on QODBC

[METEOR7]

Hi Everyone

I Get Error in ODBC when i open connect To DataBase
Error:

[Microsoft][ODBC Driver Manager] Data Source Name Not Found and No Default Driver
specified QODBC3: Unable To Connect

[Microsoft][ODBC Driver Manager] Data Source Name Not Found and No Default Driver
specified QODBC3: Unable To Connect

To copy to clipboard, switch view to plain text mode 

and I Used This Code:

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())
    {
        QMessageBox::about(this,"","OK");
    }
    QMessageBox::about(this,"",db.lastError().text());

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())
    {
        QMessageBox::about(this,"","OK");
    }
    QMessageBox::about(this,"",db.lastError().text());

To copy to clipboard, switch view to plain text mode 

Thanks

[pkj]

Have you installed your server with a named instance, instance being SQLEXPRESS? if not try..

QString serverName = "localhost";
QString dbName = "Test";
 
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
QString dsn = QString("DRIVER={SQL Native Client};SERVER=%1;DATABASE=%2;UID=sa;PWD=;").arg(serverName).arg(dbName);
 
db.setDatabaseName(dsn);
 
db.open();

QString serverName = "localhost";
QString dbName = "Test";

QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
QString dsn = QString("DRIVER={SQL Native Client};SERVER=%1;DATABASE=%2;UID=sa;PWD=;").arg(serverName).arg(dbName);

db.setDatabaseName(dsn);

db.open();

To copy to clipboard, switch view to plain text mode 

[METEOR7]

I Change Instance
And I Trying Change Code
But This Error Love Me