Qt QTableView多重继承方法

我在Qt Designer中制作了一个用户界面，现在我想显示数据。我想利用多重继承方法。这是用户界面的代码。

/********************************************************************************
** Form generated from reading UI file 'prototypejI3444.ui'
**
** Created: Mon May 30 10:04:01 2011
**      by: Qt User Interface Compiler version 4.7.0
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/
#ifndef PROTOTYPEJI3444_H
#define PROTOTYPEJI3444_H
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QGridLayout>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QLineEdit>
#include <QtGui/QMainWindow>
#include <QtGui/QMenuBar>
#include <QtGui/QPushButton>
#include <QtGui/QStatusBar>
#include <QtGui/QTableView>
#include <QtGui/QVBoxLayout>
#include <QtGui/QWidget>
QT_BEGIN_NAMESPACE
class Ui_MainWindow
{
public:
    QWidget *centralwidget;
    QGridLayout *gridLayout;
    QVBoxLayout *verticalLayout_2;
    QLabel *label;
    QVBoxLayout *verticalLayout_3;
    QLineEdit *lineEdit;
    QVBoxLayout *verticalLayout_4;
    QLabel *label_2;
    QVBoxLayout *verticalLayout_5;
    QLineEdit *lineEdit_2;
    QVBoxLayout *verticalLayout_6;
    QLabel *label_3;
    QVBoxLayout *verticalLayout_7;
    QLineEdit *lineEdit_3;
    QTableView *tableView;
    QPushButton *pushButton_2;
    QPushButton *pushButton_3;
    QPushButton *pushButton_4;
    QPushButton *pushButton_5;
    QPushButton *pushButton_6;
    QPushButton *pushButton;
    QMenuBar *menubar;
    QStatusBar *statusbar;
    void setupUi(QMainWindow *MainWindow)
    {
        if (MainWindow->objectName().isEmpty())
            MainWindow->setObjectName(QString::fromUtf8("MainWindow"));
        MainWindow->resize(800, 600);
        centralwidget = new QWidget(MainWindow);
        centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
        gridLayout = new QGridLayout(centralwidget);
        gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
        verticalLayout_2 = new QVBoxLayout();
        verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
        label = new QLabel(centralwidget);
        label->setObjectName(QString::fromUtf8("label"));
        verticalLayout_2->addWidget(label);

        gridLayout->addLayout(verticalLayout_2, 1, 0, 1, 1);
        verticalLayout_3 = new QVBoxLayout();
        verticalLayout_3->setObjectName(QString::fromUtf8("verticalLayout_3"));
        lineEdit = new QLineEdit(centralwidget);
        lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
        verticalLayout_3->addWidget(lineEdit);

        gridLayout->addLayout(verticalLayout_3, 1, 1, 1, 1);
        verticalLayout_4 = new QVBoxLayout();
        verticalLayout_4->setObjectName(QString::fromUtf8("verticalLayout_4"));
        label_2 = new QLabel(centralwidget);
        label_2->setObjectName(QString::fromUtf8("label_2"));
        verticalLayout_4->addWidget(label_2);

        gridLayout->addLayout(verticalLayout_4, 2, 0, 1, 1);
        verticalLayout_5 = new QVBoxLayout();
        verticalLayout_5->setObjectName(QString::fromUtf8("verticalLayout_5"));
        lineEdit_2 = new QLineEdit(centralwidget);
        lineEdit_2->setObjectName(QString::fromUtf8("lineEdit_2"));
        verticalLayout_5->addWidget(lineEdit_2);

        gridLayout->addLayout(verticalLayout_5, 2, 1, 1, 1);
        verticalLayout_6 = new QVBoxLayout();
        verticalLayout_6->setObjectName(QString::fromUtf8("verticalLayout_6"));
        label_3 = new QLabel(centralwidget);
        label_3->setObjectName(QString::fromUtf8("label_3"));
        verticalLayout_6->addWidget(label_3);

        gridLayout->addLayout(verticalLayout_6, 3, 0, 1, 1);
        verticalLayout_7 = new QVBoxLayout();
        verticalLayout_7->setObjectName(QString::fromUtf8("verticalLayout_7"));
        lineEdit_3 = new QLineEdit(centralwidget);
        lineEdit_3->setObjectName(QString::fromUtf8("lineEdit_3"));
        verticalLayout_7->addWidget(lineEdit_3);

        gridLayout->addLayout(verticalLayout_7, 3, 1, 1, 1);
        tableView = new QTableView(centralwidget);
        tableView->setObjectName(QString::fromUtf8("tableView"));
        gridLayout->addWidget(tableView, 0, 0, 1, 2);
        pushButton_2 = new QPushButton(centralwidget);
        pushButton_2->setObjectName(QString::fromUtf8("pushButton_2"));
        gridLayout->addWidget(pushButton_2, 2, 2, 1, 1);
        pushButton_3 = new QPushButton(centralwidget);
        pushButton_3->setObjectName(QString::fromUtf8("pushButton_3"));
        gridLayout->addWidget(pushButton_3, 3, 2, 1, 1);
        pushButton_4 = new QPushButton(centralwidget);
        pushButton_4->setObjectName(QString::fromUtf8("pushButton_4"));
        gridLayout->addWidget(pushButton_4, 1, 3, 1, 1);
        pushButton_5 = new QPushButton(centralwidget);
        pushButton_5->setObjectName(QString::fromUtf8("pushButton_5"));
        gridLayout->addWidget(pushButton_5, 2, 3, 1, 1);
        pushButton_6 = new QPushButton(centralwidget);
        pushButton_6->setObjectName(QString::fromUtf8("pushButton_6"));
        gridLayout->addWidget(pushButton_6, 3, 3, 1, 1);
        pushButton = new QPushButton(centralwidget);
        pushButton->setObjectName(QString::fromUtf8("pushButton"));
        gridLayout->addWidget(pushButton, 1, 2, 1, 1);
        MainWindow->setCentralWidget(centralwidget);
        tableView->raise();
        pushButton_2->raise();
        pushButton_3->raise();
        pushButton_4->raise();
        pushButton_5->raise();
        pushButton_6->raise();
        pushButton->raise();
        menubar = new QMenuBar(MainWindow);
        menubar->setObjectName(QString::fromUtf8("menubar"));
        menubar->setGeometry(QRect(0, 0, 800, 18));
        MainWindow->setMenuBar(menubar);
        statusbar = new QStatusBar(MainWindow);
        statusbar->setObjectName(QString::fromUtf8("statusbar"));
        MainWindow->setStatusBar(statusbar);
        retranslateUi(MainWindow);
        QMetaObject::connectSlotsByName(MainWindow);
    } // setupUi
    void retranslateUi(QMainWindow *MainWindow)
    {
        MainWindow->setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));
        label->setText(QApplication::translate("MainWindow", "FirstName:", 0, QApplication::UnicodeUTF8));
        label_2->setText(QApplication::translate("MainWindow", "SecondName:", 0, QApplication::UnicodeUTF8));
        label_3->setText(QApplication::translate("MainWindow", "City:", 0, QApplication::UnicodeUTF8));
        pushButton_2->setText(QApplication::translate("MainWindow", "New", 0, QApplication::UnicodeUTF8));
        pushButton_3->setText(QApplication::translate("MainWindow", "Delete", 0, QApplication::UnicodeUTF8));
        pushButton_4->setText(QApplication::translate("MainWindow", "Next", 0, QApplication::UnicodeUTF8));
        pushButton_5->setText(QApplication::translate("MainWindow", "Previous", 0, QApplication::UnicodeUTF8));
        pushButton_6->setText(QApplication::translate("MainWindow", "First", 0, QApplication::UnicodeUTF8));
        pushButton->setText(QApplication::translate("MainWindow", "Save", 0, QApplication::UnicodeUTF8));
    } // retranslateUi
};
namespace Ui {
    class MainWindow: public Ui_MainWindow {};
} // namespace Ui
QT_END_NAMESPACE
#endif // PROTOTYPEJI3444_H

在多重继承方法中，有一个.h文件及其相应的.cpp。我希望有人指导我在哪里连接sqlite数据库（无论是在.cpp文件中还是在.h文件中），以及如何与我显示的UI文件通信，以在Qtableview上显示数据库中的数据。

谢谢。