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]);

//}

}

}