前言

这篇博客针对<<VS+Qt+C++医院排队叫号系统>>编写代码，带用户登录，管理员登录，增删改查，代码整洁，规则，易读。学习与应用推荐首选。

文章目录

一、所需工具软件

二、使用步骤

1. 引入库

2. 代码实现

3. 运行结果

三、在线协助

一、所需工具软件

1. VS, Qt

2. C++

二、使用步骤

1.引入库

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_AdminManager.h"


#include <QWidget>

#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlError>
#include <QtSql/QtSql>

2. 代码实现

代码如下:

namespace
{
    using namespace std;

    // 结构体
    struct Person
    {
        int id;
        QString name;
    };

    // 类
    class AddressBooks
    {
    public:
        std::vector<Person> datas;
    public:
        void InitAddrssBooks();
        bool AddPerson(Person p);
        bool DeletePerson(QString personid);
        bool UpdatePerson(Person p);
        Person* FindPerson(QString personid);

    };

    Person* AddressBooks::FindPerson(QString personid)
    {
        Person* p = NULL;
        int index = -1;

        for (size_t i = 0; i < datas.size(); i++)
        {
            auto person = datas.at(i);
            if (QString::number(person.id) == personid)
            {
                index = i;
                break;
            }
        }

        if (index != -1)
        {
            p = &datas.at(index);
        }
        return p;
    }

    bool AddressBooks::AddPerson(Person p)
    {
        qDebug() << "iddd: " << QString::number(p.id);

        if (FindPerson(QString::number(p.id)))
        {
            qDebug() << "iddddd: " << p.id;
            return false;
        }

        datas.push_back(p);
        qDebug() << "data size:" << datas.size();
        return true;
    }

    bool AddressBooks::UpdatePerson(Person p)
    {
        auto person = FindPerson(QString::number(p.id));
        if (!person) return false;
        person->id = p.id;
        person->name = p.name;

        return true;
    }

    bool AddressBooks::DeletePerson(QString personid) {

        if (!FindPerson(personid)) return false;
        int index = -1;
        for (size_t i = 0; i < datas.size(); i++)
        {
            auto person = datas.at(i);
            if (person.id == personid.toInt())
            {
                index = i;
                break;
            }
        }

        datas.erase(datas.begin() + index);
        return true;
    }
    AddressBooks AddrDatabase;
}


AdminManager::AdminManager(QWidget* parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    QObject::connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(on_addButton_clicked()));
    QObject::connect(ui.pushButton_2, SIGNAL(clicked()), this, SLOT(on_delButton_clicked()));
    QObject::connect(ui.pushButton_3, SIGNAL(clicked()), this, SLOT(on_updateButton_clicked()));
    QObject::connect(ui.pushButton_4, SIGNAL(clicked()), this, SLOT(on_findButton_clicked()));
    QObject::connect(ui.pushButton_5, SIGNAL(clicked()), this, SLOT(on_check_clicked()));
    QObject::connect(ui.pushButton_6, SIGNAL(clicked()), this, SLOT(on_backLoginWindow()));

    //背景色
    ui.tableWidget->setStyleSheet("QTableView::Item{background-color:green}");


}

//显示所有
void AdminManager::on_findButton_clicked()
{
    qDebug() << "显示所有********************************** ";

    memset(&AddrDatabase, 0, sizeof(AddrDatabase)); //清空结构体

    readCSV(); //读取csv

    ui.tableWidget->clearContents();
    ui.tableWidget->setRowCount(0);
    for (int i = 0; i < AddrDatabase.datas.size(); i++)
    {
        auto person = AddrDatabase.datas.at(i);
        //qDebug() << "aaa: " << person.id;
        //qDebug() << "aaa: " << person.name;
        //qDebug() << "aaa: " << person.gender;
        //qDebug() << "aaa: " << person.age;
        //qDebug() << "aaa: " << person.classL;

        //std::cout << "test_add2 " << person.name<< std::endl;

        int rowCount = ui.tableWidget->rowCount();
        ui.tableWidget->insertRow(rowCount);

        QTableWidgetItem* columnItem0 = new QTableWidgetItem(
            QString::number(person.id));
        QTableWidgetItem* columnItem1 = new QTableWidgetItem(
            person.name);

        //QTableWidgetItem* columnItem5 = new QTableWidgetItem(
        //    query.value(5).toString());

        ui.tableWidget->setItem(rowCount, 0, columnItem0);
        ui.tableWidget->setItem(rowCount, 1, columnItem1);

        //ui.tableWidget->setItem(rowCount, 5, columnItem5);

    }



}

//删除
void AdminManager::on_delButton_clicked()
{

    Person p;
    p.id = ui.idLineEdit->text().toInt();
    qDebug() << p.id;

    AddrDatabase.DeletePerson(QString::number(p.id));
    qDebug() << "test2";
    exportCSV(); //输出到csv
    on_findButton_clicked();
}

//修改
void AdminManager::on_updateButton_clicked()
{
    qDebug() << "修改********************************** ";

    memset(&AddrDatabase, 0, sizeof(AddrDatabase)); //清空结构体

    readCSV(); //读取csv

    ui.tableWidget->clearContents();
    ui.tableWidget->setRowCount(0);
    for (int i = 0; i < AddrDatabase.datas.size(); i++)
    {
        auto person = AddrDatabase.datas.at(i);
        qDebug() << "aaa: " << person.id;
        qDebug() << "aaa: " << person.name;


        if (person.id == ui.idLineEditUpdate->text().toInt())
        {
            qDebug() << "testIf -----------------------";
            qDebug() << "person.id" << person.id;
            person.name = ui.comboBox->currentText();
            qDebug() << "person.name" << person.name;

            AddrDatabase.UpdatePerson(person);

        }
    }
    exportCSV(); //输出到csv
    on_findButton_clicked(); //执行显示所有信息函数
}

//添加
void AdminManager::on_addButton_clicked()
{
    on_findButton_clicked(); //执行显示所有信息函数

    std::cout << "test_add " << std::endl;
    Person p;
    p.id = ui.idLineEdit_2->text().toInt();
    qDebug() << p.id;


    AddrDatabase.AddPerson(p); //执行添加函数

    exportCSV(); //输出到csv

    on_findButton_clicked(); //执行显示所有信息函数

}

//查找
void AdminManager::on_check_clicked()
{
    qDebug() << "查找********************************** ";

    memset(&AddrDatabase, 0, sizeof(AddrDatabase)); //清空结构体

    readCSV(); //读取csv

    ui.tableWidget->clearContents();
    ui.tableWidget->setRowCount(0);
    for (int i = 0; i < AddrDatabase.datas.size(); i++)
    {
        auto person = AddrDatabase.datas.at(i);
        qDebug() << "aaa: " << person.id;
        qDebug() << "aaa: " << person.name;


        if (person.id == ui.lineEdit_2->text().toInt())
        {

            int rowCount = ui.tableWidget->rowCount();
            ui.tableWidget->insertRow(rowCount);

            QTableWidgetItem* columnItem0 = new QTableWidgetItem(
                QString::number(person.id));
            QTableWidgetItem* columnItem1 = new QTableWidgetItem(
                person.name);

            //QTableWidgetItem* columnItem5 = new QTableWidgetItem(
            //    query.value(5).toString());

            ui.tableWidget->setItem(rowCount, 0, columnItem0);
            ui.tableWidget->setItem(rowCount, 1, columnItem1);

            //ui.tableWidget->setItem(rowCount, 5, columnItem5);

        }
    }
}

void AdminManager::readCSV()
{
    qDebug() << "test readCSV ";

    QFile file("data.csv");
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Can't open the file!" << endl;
    }

    //一行一行直接读取文件
    while (!file.atEnd()) {
        qDebug() << "test readCSV ";
        QByteArray line = file.readLine();
        qDebug() << "line: " << line;
        QString str(line);
        str.replace("\n", "");
        qDebug() << str;

        auto list = str.split(",");


        Person p;
        p.id = list[0].toInt();
        p.name = list[1];


        AddrDatabase.AddPerson(p);
        //AddrDatabase.datas.push_back(p);

        for (int i = 0; i < AddrDatabase.datas.size(); i++)
        {
            auto person = AddrDatabase.datas.at(i);
            //qDebug() << "aaa: " << person.id;
            //qDebug() << "aaa: " << person.name;
            //qDebug() << "aaa: " << person.gender;
            //qDebug() << "aaa: " << person.age;
            //qDebug() << "aaa: " << person.classL;
        }

    }
    file.close();
}


void AdminManager::exportCSV()
{
    QString fileNamePath = "data.csv";
    QFile file(fileNamePath);
    if (!file.open(QIODevice::WriteOnly)) {
        qDebug() << "Can't open the file!" << endl;
        return;
    }

    QTextStream filestream(&file);//QTextStream 与file关联
    filestream.setCodec("utf-8");

    QStringList lines;
    for (size_t i = 0; i < AddrDatabase.datas.size(); i++)
    {
        Person p = AddrDatabase.datas.at(i);
        QString strline = QString::number(p.id) + "," + p.name;
        lines << strline;
    }

    QString str = lines.join("\n");

    qDebug() << str;

    filestream << str;
    file.flush();
    file.close();
}


//返回登录窗口
void AdminManager::on_backLoginWindow()
{
    std::cout << "test_ " << std::endl;

    this->close();
    LoginResiger* ad;
    ad = new LoginResiger;
    ad->show();

}