Qt Project Qt+MySQL实现图书管理系统

其他 2018-11-25 18:01:49 阅读次数: 0

做这个项目之前我没接触过Qt 我也没做过项目，如果贪吃蛇算项目的话。。我只是粗略的看完了C++ Primer。。
我是照着一篇SQL+JAVA的思路合着Qt快速上手完成的项目合着老师的要求

1.需求分析

1.1用户需求
面向三类用户：超级管理员、管理员、学生
超级管理员可对学生、管理员信息作查询、增加、修改操作
管理员可对书籍进行查询、增加、修改操作，可对学生的借书情况进行查看
学生可以对已借书籍进行续借、也可对未借书籍进行预约
三类用户必须输入正确的ID及PASSWORD方可进入系统

1.2 业务流程分析
该系统功能模块：

学生、管理员、超级管理员

  1. 登陆功能：登陆系统为身份验证登陆，分为学生登陆，管理员登陆，超级管理员登陆，不具备注册功能
  2. 学生登陆后：显示该用户的基本信息，可续借已借书籍，可预约未借书籍
  3. 管理员登陆后：显示该用户的基本信息，对书籍进行相应操作、查看学生的借还情况
  4. 超级管理员登陆后：显示该用户的基本信息，对管理员、学生进行相应操作
    学生
  5. 预约书籍：查询到书籍后，可对书籍进行预约
  6. 已借书籍：可对已借书籍进行续借

管理员

  1. 增加书籍：可直接向数据库输入新的书籍信息
  2. 修改书籍信息：查看书籍具体信息后，可对书籍信息进行修改
  3. 对学生借还的情况进行查看

超级管理员

  1. 增加管理员：增加一个新的管理员
  2. 查看管理员信息：查看管理员信息后，可对其进行修改
  3. 增加学生：增加一个新的学生用户
  4. 查看学生信息：查看学生信息后，可对其进行修改

2.BPM模型（这里我就贴我用PD画的模型吧）

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3.原型(使用Axure)

嗯我画的很粗略就随便看看好了，和最后实现的界面布局也差很多
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4.数据库设计(CDM->LDM->PDM->SQL)

表有book、student、administrator、superadministrator、borrow、reserve

create table book(
bno varchar(10),
bname varchar(30),
bAuthor varchar(20),
bnum int,
primary key(bno)
);

create table student(
ID varchar(10) ,
PASSWORD varchar(10),
primary key(ID)
);

create table administrator(
ID varchar(10),
PASSWORD varchar(10),
primary key(ID)
);


create table superadministrator(
ID varchar(10),
PASSWORD varchar(10),
primary key(ID)
);

create table book_borrow(
ID varchar(10),
bno varchar(10),
primary key(ID,bno),
foreign key(ID) references student(ID) on delete cascade,
foreign key(bno) references book(bno) on delete cascade);

create table reserve (
bno varchar(10),
ID varchar(10),
primary key(bno,ID),
foreign key(bno) references book(bno) on delete cascade,
foreign key(ID) references student(ID) on delete cascade);
以下是一些插入数据
insert into book values
('100001','C++ Primer','Stanley B. Lippman',100),
('100002','Database System Concepts','Avi Silberschatz',100),
('100003','数据结构算法与应用C++语言描述','Sartaj Sahni',100),
('100004','数据库系统概论','王珊',100),
('100005','数据结构C语言版','严蔚敏',100);

insert into student values('1170210042','123456');
insert into administrator values('leslie','123456');
insert into superadministrator values('leslie5','123456');

insert into book_borrow values('1170210042','100001');

insert into reserve values (100004,1170210042);

5.Qt实现

1.连接mysql数据库

请安装32位MySQL以及32位Qt5.2以上版本 我的32位Qt连接不上64位的MySQL
Qt 5.2以上版本已编译好连接MySQL的驱动，我们就可以偷偷用了嘿嘿
在连接之前，在MySQL安装目录将lib文件夹下的 libmysql.dll 文件拷贝置Qt安装目录bin下(我的是C:\QT\Qt5.11.2\5.11.2\mingw53_32\bin)

在这里注意！在之后编译的时候请务必选对编译器版本!!

在这里插入图片描述

由于我们放入的是mingw53_32文件夹下，所以在kit套件选择MinGW编译！否则会显示连接失败！（当然你可以选择放在其他目录下选择其他套件）

新建一个Qt Widgets Application,修改.pro文件QT +=sql

测试代码：

#include "mainwindow.h"
#include <QApplication>
#include<QSqlDatabase>
#include "book_student.h"
#include<QMessageBox>
#include<QSqlQuery>
#include <QSqlError>
#include <QDebug>
#include <QTextCodec>
bool creatConnect();
QString MainWindow::u;
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    creatConnect();
    MainWindow w;
    w.show();
    return a.exec();
}
bool creatConnect()
{
    QSqlDatabase db= QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("127.0.0.1");
    db.setPort(3306);
    db.setDatabaseName("library");
    db.setUserName("root");
    db.setPassword("123456");

    bool ok = db.open();//建立数据库连接
    if(!ok)
    {
        QMessageBox::critical(0,QObject::tr("连接数据库失败！！！"),db.lastError().text());
        return false;
    }
    else
    {
        QMessageBox::information(0,QObject::tr("Tips"),QObject::tr("连接数据库成功！！！"));
        return true;
    }
}

将相应的数据改成你的MySQL数据，运行，连接成功会有弹框提示

2.下面贴一下cpp代码

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<book_student.h>
#include<QTableWidget>
#include<QSqlQuery>
#include<QSqlRecord>
#include<QDebug>
#include<QMessageBox>
#include<QStandardItemModel>
#include<QTableView>
#include<QString>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setWindowTitle("图书管理系统主窗口");
    ui->PAlineEdit->setEchoMode(QLineEdit::Password);

    MainWindow::student=new book_student(this);
    MainWindow::administrator=new book_administrator(this);
    MainWindow::superadministrator=new book_super_administrator(this);
    MainWindow::brw=new Book_Borrow(this);
    //MainWindow::rsw=new Reserve;


    ui->book_search->setPlaceholderText("请输入书名");
    ui->tableWidget->setRowCount(100);     //设置行数为10
    ui->tableWidget->setColumnCount(4);   //设置列数为5
    ui->tableWidget->setColumnWidth(1,200);
    ui->tableWidget->setColumnWidth(2,200);
    QStringList header;
    header<<"Book_No"<<"Book_Name"<<"Book_Author"<<"Book_number";
    ui->tableWidget->setHorizontalHeaderLabels(header);
    QSqlQuery query;
    query.exec("select * from book");
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<4;++i)ui->tableWidget->setItem(k,i,new QTableWidgetItem(query.value(i).toString()));

    }
    //The Sign out
   /* connect(student->Signout,SIGNAL(clicked()),this,SLOT(reshow()));
    connect(administrator->Signout,SIGNAL(clicked()),this,SLOT(reshow()));
    connect(superadministrator->Signout,SIGNAL(clicked()),this,SLOT(reshow()));*/

    //Student's borrow
    connect(student->Borrowed,SIGNAL(clicked()),this,SLOT(create()));


    //admini's book manage
    //connect(administrator->)

    //connect(brw,SIGNAL(sendData(QString)),this,SLOT(receiveData(QString)));


}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    QString username=ui->IDlineEdit->text();
    QString userpassword=ui->PAlineEdit->text();
    QSqlQuery query;
    MainWindow::u=username;
    if(ui->radioButton->isChecked()){//student
        query.prepare("select PASSWORD from student where ID=:ll");
        query.bindValue(":ll",username);
        query.exec();
        query.first();
        QString password=query.value(0).toString();
        if(password==userpassword){
            student->exec();
            ui->IDlineEdit->clear();
            ui->PAlineEdit->clear();
        }else{
            QMessageBox::warning(this,"错误","用户名或密码错误！","确定");
        }
    }
    else if(ui->radioButton_2->isChecked()){//administrator
        query.prepare("select PASSWORD from administrator where ID=:ll");
        query.bindValue(":ll",username);
        query.exec();
        query.first();
        QString password=query.value(0).toString();
        if(password==userpassword){
            administrator->exec();
            ui->IDlineEdit->clear();
            ui->PAlineEdit->clear();
        }else{
           QMessageBox::warning(this,"错误","用户名或密码错误！","确定");
        }
    }
    else if(ui->radioButton_3->isChecked()){//superadministrator
        query.prepare("select PASSWORD from superadministrator where ID=:ll");
        query.bindValue(":ll",username);
        query.exec();
        query.first();
        QString password=query.value(0).toString();
        if(password==userpassword){
            superadministrator->exec();
            ui->IDlineEdit->clear();
            ui->PAlineEdit->clear();
        }else{
            QMessageBox::warning(this,"错误","用户名或密码错误！","确定");
        }
    }
}
void MainWindow::on_search_button_clicked()
{
    QString book_name=ui->book_search->text();
    QSqlQuery query;
    /*if(book_name.length()==0){QMessageBox::warning(this,"错误","请输入书名！","确定");return;}*/
    ui->tableWidget->clearContents();
    query.prepare("select * from book where bname like :ll");
    query.bindValue(":ll","%"+book_name+"%");//模糊查询
    query.exec();
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<4;++i)ui->tableWidget->setItem(k,i,new QTableWidgetItem(query.value(i).toString()));
    }
    ui->book_search->clear();
}
void MainWindow::reshow(){
    this->show();
}
void MainWindow::create(){
    QSqlQuery query;
    QStandardItemModel *model=new QStandardItemModel();
    //brw->table=new QTableView();
    model->setColumnCount(1);
    model->setHeaderData(0,Qt::Horizontal,"book_name");
    query.prepare("select bname from book where bno in (select bno from book_borrow where ID=:ll)");
    query.bindValue(":ll",MainWindow::u);
    query.exec();
    int k=-1;
    while(query.next()){
        ++k;
        model->setItem(k,new QStandardItem(query.value(0).toString()));
    }
    brw->table->setModel(model);
    brw->table->setColumnWidth(0,200);
    brw->setWindowTitle("您已借");
    brw->exec();
}
/*void MainWindow::receiveData(QString data){
    ui->lineEdit->setText(data);
}
*/

book_student.cpp

#include "book_student.h"
#include "ui_book_student.h"
#include<QMessageBox>
#include"mainwindow.h"
#include<QTableView>
#include<QStandardItemModel>
#include<QDebug>
#include<QString>
book_student::book_student(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::book_student)
{
    ui->setupUi(this);
    book_student::rsw=new Reserve(this);
    this->setWindowTitle("学生");
    this->Signout=ui->pushButton;
    this->Borrowed=ui->pushButton_3;
    this->reserve=ui->pushButton_2;
}

book_student::~book_student()
{
    delete ui;
}
void book_student::on_pushButton_clicked()//sign out
{
    this->close();
}

void book_student::on_pushButton_3_clicked()//borrowed
{

}

void book_student::on_pushButton_2_clicked()//reserve
{
    rsw->exec();
}

book_delete.cpp

#include "book_delete.h"
#include "ui_book_delete.h"
#include<QSqlQuery>
#include<QMessageBox>
Book_Delete::Book_Delete(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Book_Delete)
{
    ui->setupUi(this);
    this->line=ui->lineEdit;
}

Book_Delete::~Book_Delete()
{
    delete ui;
}

void Book_Delete::on_pushButton_clicked()
{
    if(!ui->lineEdit->text().length()){
        QMessageBox::warning(this,"错误！","请输入Book_No!");
        return;
    }
    QSqlQuery query;
    query.prepare("delete from book where bno=:ll");
    query.bindValue(":ll",ui->lineEdit->text());
    query.exec();
    QMessageBox::information(this,"恭喜！","书籍信息及相关信息删除成功！");
}

book_borrow.cpp

#include "book_borrow.h"
#include "ui_book_borrow.h"

Book_Borrow::Book_Borrow(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Book_Borrow)
{
    ui->setupUi(this);
    this->table=ui->tableView;
    //connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(buttonBox_accepted()));
}


Book_Borrow::~Book_Borrow()
{
    delete ui;
}
/*void Book_Borrow::on_pushButton_clicked()
{

}
void Book_Borrow::buttonBox_accepted(){
    emit sendData(ui->lineEdit->text());
}*/

book_administrator.cpp

#include "book_administrator.h"
#include "ui_book_administrator.h"
#include<QTableView>
#include<QStandardItemModel>
#include<QSqlQuery>
#include<QDebug>
book_administrator::book_administrator(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::book_administrator)
{
    ui->setupUi(this);
    this->setWindowTitle("管理员");
    this->Signout=ui->pushButton;
    this->book_rsw=ui->pushButton_3;//预约情况
    this->book_brw=ui->pushButton_2;//借还情况
    book_administrator::brw=new Book_Borrow();
    book_administrator::jiehuan=new Book_Borrow();
    book_administrator::chose=new Choose();
}

book_administrator::~book_administrator()
{
    delete ui;
}

void book_administrator::on_pushButton_clicked()//Sign Out
{
    this->close();
}

void book_administrator::on_pushButton_3_clicked()//学生预约
{
   //book_administrator::brw->table=new QTableView;
    QStandardItemModel *model=new QStandardItemModel();
    model->setColumnCount(2);
    model->setHeaderData(0,Qt::Horizontal,"Book_No");
    model->setHeaderData(1,Qt::Horizontal,"Student_ID");
    
    QSqlQuery query;
    query.exec("select * from reserve");
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<2;++i)model->setItem(k,i,new QStandardItem(query.value(i).toString()));
    }
    book_administrator::brw->table->setModel(model);
    book_administrator::brw->setWindowTitle("学生预约情况");
    book_administrator::brw->exec();
}

void book_administrator::on_pushButton_4_clicked()//学生借还
{
    QStandardItemModel *model=new QStandardItemModel();
    model->setColumnCount(2);
    model->setHeaderData(0,Qt::Horizontal,"ID");
    model->setHeaderData(1,Qt::Horizontal,"Book_No");
    QSqlQuery query;
    query.exec("select * from book_borrow");
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<2;++i)model->setItem(k,i,new QStandardItem(query.value(i).toString()));
    }
    book_administrator::jiehuan->table->setModel(model);
    book_administrator::jiehuan->setWindowTitle("学生借还情况");
    book_administrator::jiehuan->exec();
}

void book_administrator::on_pushButton_2_clicked()
{
    chose->setWindowTitle("请选择您要进行的操作");
    chose->exec();
}

admini_delete.cpp

#include "admini_delete.h"
#include "ui_admini_delete.h"
#include<QSqlQuery>
#include<QMessageBox>
Admini_Delete::Admini_Delete(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Admini_Delete)
{
    ui->setupUi(this);
    this->setWindowTitle("管理员删除");
}

Admini_Delete::~Admini_Delete()
{
    delete ui;
}

void Admini_Delete::on_pushButton_clicked()
{
    if(!ui->lineEdit->text().length()){
        QMessageBox::warning(this,"错误！","请输入管理员编号！");
        return;
    }
    QSqlQuery query;
    query.prepare("delete from administrator where ID=:ll");
    query.bindValue(":ll",ui->lineEdit->text());
    query.exec();
    QMessageBox::information(this,"恭喜！","信息删除成功!");
    ui->lineEdit->clear();
}

admini_insert.cpp

#include "adimi_insert.h"
#include "ui_adimi_insert.h"
#include<QSqlQuery>
#include<QMessageBox>
Adimi_Insert::Adimi_Insert(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Adimi_Insert)
{
    ui->setupUi(this);
    this->setWindowTitle("管理员添加");
}

Adimi_Insert::~Adimi_Insert()
{
    delete ui;
}

void Adimi_Insert::on_pushButton_clicked()
{
    if(!(ui->lineEdit->text().length()&&ui->lineEdit_2->text().length())){
        QMessageBox::warning(this,"错误！","请填入信息！");
        return;
    }
    QSqlQuery query;
    query.prepare("insert into administrator values(:kk,:ll)");
    query.bindValue(":kk",ui->lineEdit->text());
    query.bindValue(":ll",ui->lineEdit_2->text());
    query.exec();
    QMessageBox::information(this,"恭喜！","插入成功！");
    ui->lineEdit->clear();
    ui->lineEdit_2->clear();
}

book_superadministrator.cpp

#include "book_super_administrator.h"
#include "ui_book_super_administrator.h"

book_super_administrator::book_super_administrator(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::book_super_administrator)
{
    ui->setupUi(this);
    this->setWindowTitle("超级管理员");
    this->Signout=ui->pushButton;
    book_super_administrator::ade=new Admini_Delete();
    book_super_administrator::ait=new Adimi_Insert();
    book_super_administrator::sde=new Stu_Delete();
    book_super_administrator::sit=new Stu_Insert();
}

book_super_administrator::~book_super_administrator()
{
    delete ui;
}

void book_super_administrator::on_pushButton_clicked()//Sign Out
{
    this->close();
}

void book_super_administrator::on_pushButton_2_clicked()//管理员删除
{

    ade->exec();
}

void book_super_administrator::on_pushButton_3_clicked()//管理员添加
{
    ait->exec();
}

void book_super_administrator::on_pushButton_4_clicked()//学生删除
{
    sde->exec();
}

void book_super_administrator::on_pushButton_5_clicked()//学生添加
{
    sit->exec();
}

choose.cpp

#include "choose.h"
#include "ui_choose.h"
#include<QMessageBox>
Choose::Choose(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Choose)
{
    ui->setupUi(this);
    Choose::ist=new Insert();
    Choose::dlt=new Book_Delete();
}

Choose::~Choose()
{
    delete ui;
}

void Choose::on_pushButton_clicked()
{
    ist->setWindowTitle("请填入相关信息");
    ist->exec();
}

void Choose::on_pushButton_2_clicked()
{
    QMessageBox::information(this,"注意！","删除书籍同时会删除学生的预约和借阅信息！");
    dlt->setWindowTitle("请输入要删除的图书编号");
    dlt->line->setPlaceholderText("请输入Book_No");
    dlt->exec();
}

insert.cpp

#include "insert.h"
#include "ui_insert.h"
#include<QMessageBox>
#include<QSqlQuery>
Insert::Insert(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Insert)
{
    ui->setupUi(this);
}

Insert::~Insert()
{
    delete ui;
}

void Insert::on_pushButton_clicked()
{
    if(!(ui->Book_ID->text().length()&&ui->Book_Name->text().length()&&ui->Book_Author->text().length()&&ui->Book_number->text().length())){
        QMessageBox::warning(this,"错误！","请勿空输入！");
        return;
    }
    QSqlQuery query;
    query.prepare("insert into book values(:hh,:jj,:kk,:ll)");
    query.bindValue(":hh",ui->Book_ID->text());
    query.bindValue(":jj",ui->Book_Name->text());
    query.bindValue(":kk",ui->Book_Author->text());
    query.bindValue(":ll",ui->Book_number->text().toInt());
    query.exec();
    QMessageBox::information(this,"恭喜！","插入书籍信息成功！");
}

reserve.cpp

#include "reserve.h"
#include "ui_reserve.h"
#include<QString>
#include<QSqlQuery>
#include<QMessageBox>
#include<mainwindow.h>
Reserve::Reserve(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Reserve)
{
    ui->setupUi(this);
    this->setWindowTitle("预约书籍");
    ui->book_search->setPlaceholderText("请输入书名");
    ui->resline->setPlaceholderText("请输入Book_No");
    ui->tableWidget->setRowCount(100);     //设置行数为10
    ui->tableWidget->setColumnCount(4);   //设置列数为5
    ui->tableWidget->setColumnWidth(1,200);
    ui->tableWidget->setColumnWidth(2,200);
    QStringList header;
    header<<"Book_No"<<"Book_Name"<<"Book_Author"<<"Book_number";
    ui->tableWidget->setHorizontalHeaderLabels(header);
    QSqlQuery query;
    query.exec("select * from book");
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<4;++i)ui->tableWidget->setItem(k,i,new QTableWidgetItem(query.value(i).toString()));

    }
}

Reserve::~Reserve()
{
    delete ui;
}

void Reserve::on_pushButton_clicked()
{
    QString book_name=ui->book_search->text();
    QSqlQuery query;
    if(book_name.length()==0){QMessageBox::warning(this,"错误","请输入书名！","确定");return;}
    ui->tableWidget->clearContents();
    query.prepare("select * from book where bname like :ll");
    query.bindValue(":ll","%"+book_name+"%");//模糊查询
    query.exec();
    int k=-1;
    while(query.next()){
        ++k;
        for(int i=0;i<4;++i)ui->tableWidget->setItem(k,i,new QTableWidgetItem(query.value(i).toString()));
    }
}

void Reserve::on_pushButton_2_clicked()
{
    QString book_No=ui->resline->text();
    QSqlQuery query;
    if(book_No.length()==0){QMessageBox::warning(this,"错误","请输入Book_No！","确定");return;}
    query.prepare("select bnum from book where bno=:ll");
    query.bindValue(":ll",book_No);
    query.exec();
    query.first();
    int val=query.value(0).toInt();
    if(val){
        QMessageBox::information(this,QString("恭喜！"),QString("您已预约成功，请在24小时之内入图书馆借阅！"));
        query.prepare("update book set bnum =bnum-1 where bno=:ll");
        query.bindValue(":ll",book_No);
        query.exec();
        query.prepare("insert into reserve values (:ll,:kk)");
        query.bindValue(":kk",MainWindow::u);
        query.bindValue(":ll",book_No);
        query.exec();
    }else{
        QMessageBox::warning(this,QString("Sorry!"),QString("本书不存在或库存为空"));
    }
}

stu.delete.cpp

#include "stu_delete.h"
#include "ui_stu_delete.h"
#include<QSqlQuery>
#include<QMessageBox>
Stu_Delete::Stu_Delete(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Stu_Delete)
{
    ui->setupUi(this);
    this->setWindowTitle("学生删除");
}

Stu_Delete::~Stu_Delete()
{
    delete ui;
}

void Stu_Delete::on_pushButton_clicked()
{
    if(!ui->lineEdit->text().length()){
        QMessageBox::warning(this,"错误！","请输入学生编号！");
    }
    QSqlQuery query;
    query.prepare("delete from student where ID=:ll");
    query.bindValue(":ll",ui->lineEdit->text());
    query.exec();
    QMessageBox::information(this,"恭喜！","删除成功！");
    ui->lineEdit->clear();
}

stu.insert.cpp

#include "stu_insert.h"
#include "ui_stu_insert.h"
#include<QSqlQuery>
#include<QMessageBox>
Stu_Insert::Stu_Insert(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Stu_Insert)
{
    ui->setupUi(this);
    this->setWindowTitle("学生添加");
}

Stu_Insert::~Stu_Insert()
{
    delete ui;
}

void Stu_Insert::on_pushButton_clicked()
{
    if(!(ui->lineEdit->text().length()&&ui->lineEdit_2->text().length())){
        QMessageBox::warning(this,"错误！","请输入信息！");
        return;
    }
    QSqlQuery query;
    query.prepare("insert into student values(:kk,:ll)");
    query.bindValue(":kk",ui->lineEdit->text());
    query.bindValue(":ll",ui->lineEdit_2->text());
    query.exec();
    QMessageBox::information(this,"恭喜！","插入成功！");
    ui->lineEdit->clear();
    ui->lineEdit_2->clear();
}

6.总结

虽然这个项目做的很烂，但是我觉的首先收获还是很大的，这是我第一个用C++写的GUI程序，也让我终于感觉到一点类的继承派生在具体应用中的体现，然后就是我感觉Qt和VB好像，感觉要把C++ Primer重新看一遍，加油！

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