qt读取oracle表数据

#include "widget.h"
#include <QApplication>
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlQuery>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    int index=0;

    //连接数据库
    QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");
    db.setPort(1521);
    db.setHostName("ip");
    db.setDatabaseName("dbname");
    db.setUserName("username");
    db.setPassword("pwd");
    if (db.open()) {
        qDebug()<< "RIGHT";
    }else{
        qDebug()<< "ERROR";
        return 0;
    }

    QVariantList* pVarList = new QVariantList[3];
    for ( index = 0; index < 3; index++ )
            pVarList[index].clear();

    QSqlQuery query("SELECT id,name from user where rownum<=6");
    while (query.next())
    {
        for ( index = 0; index < 3; index++ )
            pVarList[index] <<query.value(index);
    }


    qDebug()<< pVarList[2].value(1).toString();
    qDebug()<< "read over";

    return a.exec();
}