如何用qt实现学生信息管理系统

版权声明：本篇文章由IT_CREATE整理 https://blog.csdn.net/IT_CREATE/article/details/82027462

源码资源https://download.csdn.net/download/it_create/10625713

以下是效果图

mainwindow.cpp

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QString>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QtWidgets>
#include <QTimer>
#include "deletedialog.h"
#include "insertdialog.h"
#include "selectdialog.h"
#include "updatedialog.h"

namespace Ui {
class MainWindow;
}

struct stdinformation
{
    QString name;
    QString number;
    QString  results;
};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();


private slots:
    void on_change_pushButton_clicked();

    void on_add_pushButton_clicked();

    void on_delete_pushButton_clicked();

    void on_refer_pushButton_clicked();

    void tabletimeslot();

private:
    Ui::MainWindow *ui;
    QSqlDatabase db;
    QTimer *tabletime;
    deleteDialog student_delete;
    insertDialog student_insert;
    updateDialog student_update;
    selectDialog student_select;
    int t;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
	
	//创建数据库，并检查数据库中的数据并在表中生成相应的行数
    db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("my.db");
    if(db.open())
    {
        qDebug()<<"打开成功";
    }
    QSqlQuery query;
    if(query.exec("create table student(StudentName VARCHAR(30),StudentNumber VARCHAR(30),"
               "StudentCollege VARCHAR(30),StudentAge VARCHAR(30),StudentSex VARCHAR(30))"))
    {
        qDebug()<<"创建成功";
    }

    query.exec("select * from student");
    t=0;
    while(query.next())
    {
        ui->information_tableWidget->insertRow(t);
        t++;
    }
	 
	//刷新表的定时器
    tabletime = new QTimer(this);
    tabletime->start(2000);
    connect(tabletime,SIGNAL(timeout()),this,SLOT(tabletimeslot()));


}

MainWindow::~MainWindow()
{
    delete ui;
    qDebug()<<"hello";
}

void MainWindow::on_change_pushButton_clicked()
{
    student_update.show();  //修改学生信息界面
}

void MainWindow::on_add_pushButton_clicked()
{
    int index_row = ui->information_tableWidget->rowCount();
    ui->information_tableWidget->setRowCount(index_row+1);
    student_insert.show();   //添加学生信息界面
}

void MainWindow::on_delete_pushButton_clicked()
{
    student_delete.show();  //删除学生信息界面
}

void MainWindow::on_refer_pushButton_clicked()
{
    student_select.show();  //查找学生信息界面
}

void MainWindow::tabletimeslot() //主界面刷新表
{
    ui->information_tableWidget->clearContents();
    //QString studentname,studentnumber,studentcollege,studentage,studentsex;
    QSqlQuery query;
    query.exec("select * from student");
    int t=0;
    while(query.next())
    {
        ui->information_tableWidget->setItem(t,0,new QTableWidgetItem(query.value(0).toString()));
        ui->information_tableWidget->setItem(t,1,new QTableWidgetItem(query.value(1).toString()));
        ui->information_tableWidget->setItem(t,2,new QTableWidgetItem(query.value(2).toString()));
        ui->information_tableWidget->setItem(t,3,new QTableWidgetItem(query.value(3).toString()));
        ui->information_tableWidget->setItem(t,4,new QTableWidgetItem(query.value(4).toString()));
        ui->information_tableWidget->setItem(t,5,new QTableWidgetItem(query.value(5).toString()));
        /*qDebug()<<query.value(0).toString()<<","<<query.value(1).toString()<<","<<query.value(2).toString()<<
                  ","<<query.value(3).toString()<<","<<query.value(4).toString();*/
        t++;
    }
}

insertdialog.h

#ifndef INSERTDIALOG_H
#define INSERTDIALOG_H

#include <QDialog>

namespace Ui {
class insertDialog;
}

class insertDialog : public QDialog
{
    Q_OBJECT

public:
    explicit insertDialog(QWidget *parent = 0);
    ~insertDialog();

private slots:
    void on_insert_pushButton_clicked();

private:
    Ui::insertDialog *ui;
};

#endif // INSERTDIALOG_H

insertdialog.cpp

#include "insertdialog.h"
#include "ui_insertdialog.h"
#include "mainwindow.h"
#include <QSqlQuery>

insertDialog::insertDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::insertDialog)
{
    ui->setupUi(this);
}

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

void insertDialog::on_insert_pushButton_clicked()
{
    if(ui->studentname_lineEdit->text().isEmpty() || ui->studentnumber_ineEdit->text().isEmpty() ||
            ui->studentcollege_lineEdit->text().isEmpty() || ui->studentage_lineEdit->text().isEmpty() ||
            ui->studentsex_lineEdit->text().isEmpty())
    {
        QMessageBox::information(this,"提示","请输入完整");
    }
    else
    {
    QString student_name = ui->studentname_lineEdit->text();
    QString student_number = ui->studentnumber_ineEdit->text();
    QString student_college = ui->studentcollege_lineEdit->text();
    QString student_age =ui->studentage_lineEdit->text();
    QString student_sex =ui->studentsex_lineEdit->text();
    QSqlQuery query;
    int index_delete = 0;
    query.exec("select * from student");
    while(query.next())
    {
        if(student_number == query.value(1))
        {
            index_delete = 1;
            break;
        }
    }
    if(index_delete == 1)
    {
        QMessageBox::information(this,"提示","学号已存在");
    }
    else
    {
    QString insert_student = QString("insert into student values(\"%1\",\"%2\",\"%3\",\"%4\",\"%5\")").arg(
                student_name,student_number,student_college,student_age,student_sex);
    qDebug()<<insert_student;
    if(query.exec(insert_student))
    {
        QMessageBox::information(this,"成功","插入成功");
    }
    else
        QMessageBox::information(this,"失败","插入失败");
    }
    }
}

deletedialog.h

#ifndef DELETEDIALOG_H
#define DELETEDIALOG_H

#include <QDialog>

namespace Ui {
class deleteDialog;
}

class deleteDialog : public QDialog
{
    Q_OBJECT

public:
    explicit deleteDialog(QWidget *parent = 0);
    ~deleteDialog();

private slots:
    void on_delete_pushButton_clicked();

private:
    Ui::deleteDialog *ui;
};

#endif // DELETEDIALOG_H

deletedialog.cpp

#include "deletedialog.h"
#include "ui_deletedialog.h"
#include "mainwindow.h"
#include <QSqlQuery>

deleteDialog::deleteDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::deleteDialog)
{
    ui->setupUi(this);
}

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

void deleteDialog::on_delete_pushButton_clicked()
{
    if(ui->scanf_lineEdit->text().isEmpty())
    {
        QMessageBox::information(this,"提示","请输入内容");
    }
    else
    {
    if(ui->studentname_radioButton->isChecked())
    {
        QString student_name;
        student_name = ui->scanf_lineEdit->text();
        QSqlQuery query;
        query.exec("select * from student");
        int t =0;
        while(query.next())
        {
            if(student_name == query.value(0).toString())
            {
                t= 1;
                break;
            }
        }
        if(t == 1)
        {
        QString delete_name = QString("delete from student where StudentName = \"%1\"").arg(student_name);
        qDebug()<<delete_name;
        if(query.exec(delete_name))
        {
            QMessageBox::information(this,"成功","删除成功");
        }
        else
        {
            QMessageBox::information(this,"失败","删除失败");
        }
    }
        else
        {
            QMessageBox::information(this,"提示","不存在的姓名");
        }
    }
    else if(ui->studentnumber_radioButton->isChecked())
    {
        QString student_number;
        student_number = ui->scanf_lineEdit->text();
        QSqlQuery query;
        query.exec("select * from student");
        int t =0;
        while(query.next())
        {
            if(student_number == query.value(1).toString())
            {
                t= 1;
                break;
            }
        }
        if( t== 1)
        {
        QString delete_student = QString("delete from student where StudentNumber = \"%1\"").arg(student_number);
        if(query.exec(delete_student))
        {
            QMessageBox::information(this,"成功","删除成功");
        }
        else
            QMessageBox::information(this,"失败","删除失败");
    }
        else
        {
            QMessageBox::information(this,"提示","不存在的学号");
        }
    }
    else
    {
        QMessageBox::information(this,"提示","请选择姓名或学号");
    }
    }
}