Could anyone tell me why I cant execute the SQL query?

[DrizzleX]

@

#include <QtCore/QCoreApplication>
#include <QtSql/QSqlDatabase>
#include <QtSql>
#include <QStringList>
#include <QDebug>

struct Student
{
QString id;
QString name;
QString sex;
};

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");


QString dsn = QString::fromLocal8Bit("DRIVER={SQL SERVER};SERVER=127.0.0.1;DATABASE=mydb");
db.setDatabaseName(dsn);
db.setUserName("admin");
db.setPassword("123456");
if(db.open()) {
    qDebug()<<"OK!";
}
else{
    qDebug()<<"Error!";
}


QSqlQuery query(db);
query.exec&#40;"select * from NewStudent"&#41;;

QSqlError error=query.lastError();
qDebug()<<error.number();

if(!query.isValid()){
    qDebug()<<"Invalid!";
}

while(query.next()){
    Student student;

    student.id=query.value(0).toString();
    student.name=query.value(1).toString();
    student.sex=query.value(2).toString();

    qDebug()<<"ID: "<<student.id<<" Name: "<<student.name<<" Sex: "<<student.sex;
}


return a.exec&#40;&#41;;

}
@
the output of qDebug()<<error.number();
is 16945，and Invalid is printed

[qxoz]

Where do you get the QODBC driver(how you build and from which source)?