问如何从Qt5连接到oracle云数据库

EN

extern int      QtConnection(int argc, char *argv[])
{
    QCoreApplication a();
    
    QSqlDatabase db = QSqlDatabase::addDatabase("QOCI", "conn_name"); 
    
    db.setDatabaseName("database");
    db.setUserName("eternumx");
    db.setPassword("12345678");
    db.setConnectOptions("OCI_ATTR_PREFETCH_ROWS=1000"); 

    if (db.isValid())
    {   
        db.open();

        if (!db.isOpen())
        {   
            qDebug() << db.lastError().text().toLatin1().data() << endl;
            return 0;
        }   
    }   
    else
    {   
        qDebug() << db.lastError().text().toLatin1().data() << endl;
        return 0;
    }   

    return 1;
}