qt连接mysql数据库以及txt文本的复制操作

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QDebug>

#include <QDialog>

#include <QPalette>

#include <QButtonGroup>

#include <QMessageBox>

#include <QSqlTableModel>

#include <QSqlRecord>

#include <QTime>

#include <QMessageBox>

#include <QButtonGroup>

#include <QSqlQuery>

#include <string>

using namespace  std;

#include <iostream>

#include <fstream>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

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

    db.setHostName("localhost");

    db.setDatabaseName("test");

    db.setUserName("root");

    db.setPassword("123456");

    db.open();

    model=new QSqlTableModel(this);

    model->setEditStrategy(QSqlTableModel::OnManualSubmit);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_pushButton_clicked()

{

    QSqlQuery query;

    query.exec("SELECT * FROM students ORDER BY id ASC");

    model->setTable("students");

    model->select();

    while (query.next())

    {

        //依次获取表中第五列数据

        int rowNum = model->rowCount(); // 获得表的行数

        qDebug()<<"rowNum"<<rowNum<<endl;

        QString txtph = query.value(4).toString();//query.value()的参数只能是index（第五列的数据）

        qDebug()<<"txtph"<<txtph<<endl;

        QByteArray   aByteArray  =  txtph.toLatin1();//先把转化为QByteArray的结果存储起来

        const char* txtph2 =  aByteArray.data();//再调用data()或constData()

        //获取每个txt文本路径，并全部复制到2.txt中(txt文本的复制操作)

        ifstream myfile(txtph2);

        ofstream outfile("D:\\VS\\born\\2.txt", ofstream::app);

        string temp;

        if (!myfile.is_open())  {

            cout << "未成功打开文件" << endl;

        }

        //        while (getline(myfile, temp,'\n'))  {

        while (getline(myfile, temp))  {

            outfile << temp ;

            //             outfile << temp ;

        }

        outfile<<endl;

        myfile.close();

        //        if(pFileIn[0]==NULL || pFileIn[1]==NULL || pFileOut==NULL) return 1;

        //        for(int i=0;i<2;i++)

        //        {

        //            while(!feof(pFileIn[i]))

        //            {

        //                ch=fgetc(pFileIn[i]);

        //                fputc(ch,pFileOut);

        //            }

        //            fclose(pFileIn[i]);

        //        }

    }

}