QString dsn = QString("Driver=(SQL SERVER);SERVER=localhost\MSSQLSERVER;DATABASE=test_database;UID=sa;PWD=SA$Admin;");

db.setDatabaseName(dsn);

bool test;
test = db.isValid();

   if (test) //true
     QMessageBox::information(this,"ODBC Connectivity","database is valid");

   test = db.isDriverAvailable("QODBC3");

   if ( test ) //true 
     QMessageBox::information(this,"ODBC driver availbility","driver is available");


if(db.open())
{
    QMessageBox::information(this,"test_database","database opened");
    db.close();
}
else
{
    QMessageBox::information(this,"test_database",db.lastError().text());
}

@

[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified QODBC3: Unable to connects

and to display driveres availablability with this code to on messagebox :-

@
QStringList strlist = QSqlDatabase::drivers();
int i = 1;
QString str2 = "";
QString str = "";

foreach (str, strlist)
    str2 += "  " + QString::number(i++) + ".  " + str;

 QMessageBox::information(this,"test_database",str2);

@

I found this message :-

1. QSQLITE 2. QMYSQL 3. QMYSQL3 4. QODBC 5. QODBC3 6. QPSQL 7. QPSQL7

Where am I going wrong. Please tell me how to connect.