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Yyds dry goods inventory student attendance system based on QT design

2022-07-02 16:10:00 【DS brother Bruce Lee】

1. Function is introduced

The current design of the attendance system is mainly for college teachers , In class , When students enter the classroom, they take out their student cards and open their attendance cards , You can apply for leave in the system and view all class attendance information during school .

Considering the large number of students in the whole school , Personal privacy issues , For this reason, each new student needs to log in to the student information management page by the administrator or his own head teacher to add student information , Add information about students ; Then the students themselves go to the login interface to register students , Improve your other information , After the prompt of successful registration , After entering the login interface and filling in the account and password at the time of registration, you can log in successfully , Finally, you can use the function modules of the student operation page . Teachers need to log in to the teacher management background through the specified teacher account and password , To use the function modules of the teacher's operation page . The system administrator needs to use the specified administrator account 、 Password login to the administrator background , To use the function modules of the administrator operation page . The operation pages of the three are independent of each other , All have permission restrictions .

The current design is based on RFID Student attendance management system , use C++ As a programming language ,Qt As a whole UI software framework , Database adoption SQLite, Before designing this attendance system , Extensive search on the Internet , Many cases have been found , I found many attendance management systems , There are also some problems in the operation process and management line , This system combines the advantages of other software , Removed some unnecessary modules , Design a new attendance management system .

The function modules are as follows :

Login module ： User name and password login , This design has three kinds of user names , Including system administrators , Teachers and students ;
Student information management module ： The increase of students' basic information , Delete , modify , Inquire about ;
Attendance management module ： Check in and out students ;
RF card management module ： Use the radio frequency card to record the attendance of students ;
Query module ： Administrators , Teachers' , Students can query the attendance results within their permission ;
Leave inquiry module ： adopt ID Inquire about the students' leave ;
Data backup module ： The system data shall be saved regularly , But it can help when the system server fails .

The system has 3 User permissions , Student operation page 、 Administrator action page 、 Teacher operation page . Student operation page , You can view your attendance records ; On the teacher operation page, you can view the attendance records of students in your class , Add attendance students ; Administrators can view attendance records of all people , Support all functions .

#yyds Dry inventory # be based on Qt Designed student attendance system _ Function module

#yyds Dry inventory # be based on Qt Designed student attendance system _sql_02

#yyds Dry inventory # be based on Qt Designed student attendance system _ Function module _03

USB Interface IC Card reader , Adopt the one launched by Minghua company RF reader RF-EYE . It takes use 了 USB Interface communication and power supply , Support ISO14443-3 Card of agreement , for example Mifare One、 UltraLight、 Mifare 4K、 MifarePro etc. . The interface function library provided can meet the needs of secondary development of users ; Its perfection 、 Reliable interface functions , Support to access all functions of RF card .

#yyds Dry inventory # be based on Qt Designed student attendance system _ Time Attendance _04

#yyds Dry inventory # be based on Qt Designed student attendance system _ Function module _05

2. Design implementation

2.1 System function module

The overall design block diagram is as follows :

#yyds Dry inventory # be based on Qt Designed student attendance system _ data _06

2.2 Login flowchart

Administrators and teachers fill in the login information module , You need to enter the login account and login password at the time of registration , As a user, select one of the teachers or administrators , The administrator account and the teacher account are independent of each other .

#yyds Dry inventory # be based on Qt Designed student attendance system _ data _07

#yyds Dry inventory # be based on Qt Designed student attendance system _ Function module _08

2.3 Add student

Data is stored locally SQLite Inside .

#yyds Dry inventory # be based on Qt Designed student attendance system _ Time Attendance _09

#yyds Dry inventory # be based on Qt Designed student attendance system _sql_10

2.4 Leave management

#yyds Dry inventory # be based on Qt Designed student attendance system _sql_11

#yyds Dry inventory # be based on Qt Designed student attendance system _ Time Attendance _12

3. Project source code

#yyds Dry inventory # be based on Qt Designed student attendance system _ Time Attendance _13

3.1 Read and save configuration information

// Read configuration 
void LoginWindow::read_config()
{
    // Read configuration file 
    QString text;
    text=QCoreApplication::applicationDirPath()+"/"+CONFIG;

    QString pass;
    QString user;
    // Judge whether the file exists 
    if(QFile::exists(text))
    {
        QFile filenew(text);
        filenew.open(QIODevice::ReadOnly);
        QDataStream in(&filenew); //  Read serialized data from file 
        in >> user >> pass; // Extract written data 
        filenew.close();

        // Set the interface value 
       ui->lineEdit_user_name->setText(user);
       ui->lineEdit_password->setText(pass);
       ui->checkBox_save_password->setChecked(true);
    }
}


// Write configuration 
void LoginWindow::write_config()
{
    QString pass;
    QString user;
    // from UI Interface to obtain user's personalized configuration parameters 
    pass=ui->lineEdit_password->text();
    user=ui->lineEdit_user_name->text();

    /* Save data to file , Easy to load next time */
    QString text;
    text=QCoreApplication::applicationDirPath()+"/"+CONFIG;
    QFile filesrc(text);
    filesrc.open(QIODevice::WriteOnly);
    QDataStream out(&filesrc);
    out << user;  // Serialize user name 
    out << pass;  // Serialize password 
    filesrc.flush();
    filesrc.close();
}

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3.2 Save and search login information

// Create an account and password table 
void LoginWindow::CreateUserPassTAB()
{
    // database : Build table , If it exists, it is not created , Create... If it doesn't exist 
    QSqlQuery sql_query(database);

    // The following statement queries whether the specified table exists .
    sql_query.exec(QString("select count(*) from sqlite_master where type='table' and name='%1'").arg("password"));
    if(sql_query.next())
    {
        if(sql_query.value(0).toInt()==0)
        {
            qDebug(" Database tables do not exist . Ready to create .\n");
            // Create a table   Create a table statement ：create table <table_name> (f1 type1, f2 type2,…);
            /* CREATE TABLE  Is a keyword that tells the database system to create a new table . * CREATE TABLE  Statement followed by the unique name of the table  *  Or identification */
            /* The following statement :  Create a name password Table of , The fields are respectively stored   account number 、 password 、 identity (0 Administrators 、1 Teachers' 、2 Student )*/
            QString create_sql = "create table password(id int primary key, user varchar(100),password varchar(100),int type)";

            sql_query.prepare(create_sql);
            if(!sql_query.exec())
            {
                Log_Text_Display(" Database table creation failed .\n");
            }
            else
            {
                Log_Text_Display(" Database table created successfully .\n");
                // Initialized administrator password 
                addPasswords(ROOT_USER,ROOT_PASSWORD,0);
            }
        }
        else
        {
            Log_Text_Display(" Database tables exist . No need to create .\n");
        }
    }
}


// Show log 
void LoginWindow::Log_Text_Display(QString text)
{
    qDebug()<<text;
}

// Insert data into database file 
bool LoginWindow::addPasswords(QString user,QString pass,int type)
{
    // Specify the database for the operation 
    QSqlQuery sql_query(database);
    // The most inquired ID
    QString select_max_sql = "select max(id) from password";
    int max_id = 0;
    sql_query.prepare(select_max_sql);
    if(!sql_query.exec())
    {
        Log_Text_Display(" Database maximum ID To find the failure .\n");
    }
    else
    {
        while(sql_query.next())
        {
            max_id = sql_query.value(0).toInt();
        }

        Log_Text_Display(QString("data base max id:%1\n").arg(max_id));

        // Add data 
        // insert data   Insert statement ：insert into <table_name> values (value1, value2,…);
        QString insert_sql = tr("insert into password values(?,?,?,?)");
        sql_query.prepare(insert_sql);
        //if(max_id!=0)max_id+=1; // Determine whether it is the first data 
        sql_query.addBindValue(max_id+1); //id
        sql_query.addBindValue(user);    // account number 
        sql_query.addBindValue(pass);    // password 
        sql_query.addBindValue(type);    // type 
        if(!sql_query.exec())
        {
            Log_Text_Display(" Data insertion failed .\n");
        }
        else
        {
            return true;
        }
    }
    return false;
}


// Compare passwords  true success  false Failure 
bool LoginWindow::ComparePasswords(QString user,QString pass,int type)
{
    // Specify the database for the operation 
    QSqlQuery sql_query(database);
    // Query all data 
    sql_query.prepare("select * from password");
    if(!sql_query.exec())
    {
        Log_Text_Display(" Database query error .\n");
    }
    else
    {
        while(sql_query.next())
        {
            int id = sql_query.value(0).toInt(); //ID-- Primary key 
            QString sql_user = sql_query.value(1).toString(); // account number 
            QString sql_pass = sql_query.value(2).toString(); // password 
            int sql_type = sql_query.value(3).toInt(); // Identity type 
            // Compare passwords 
            if(user==sql_user && sql_pass==pass && sql_type ==type)
            {
                return true;
            }
        }
    }
    return false;
}

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3.3 Initialization of the main interface

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setWindowTitle(" Student attendance management system ");

    // Set up and open the database 
    if (QSqlDatabase::contains(LOG_IN_DATABASE_CONNECT_NAME))
    {
        database = QSqlDatabase::database(LOG_IN_DATABASE_CONNECT_NAME);
    }
    else
    {
        // Database type 
        database = QSqlDatabase::addDatabase("QSQLITE",LOG_IN_DATABASE_CONNECT_NAME);
        database.setDatabaseName(LOG_IN_DATABASE_NAME); // Database name 
        database.setUserName("xl");  // user name 
        database.setPassword("123456"); // password 
    }

    // Open database , Open the database if it exists , Create automatically if it doesn't exist 
    if(database.open()==false)
    {
        qDebug(" Database open failed . Please check the program running path and permissions .\n");
    }
    else
    {
        qDebug(" Successfully connected to database .\n");
    }

    // Create an account and password table 
    CreateUserPassTAB();

    // Configure the management table style attribute of account and password 
    // Odd and even rows alternate colors 
    //ui->tableWidget_user_pass->setAlternatingRowColors(true);
    // When selected, a line is selected as a whole 
    ui->tableWidget_user_pass->setSelectionBehavior(QAbstractItemView::SelectRows);
    // Last line stretch fill 
    //ui->tableWidget_user_pass->horizontalHeader()->setStretchLastSection(true);
    // Check whether the header of a row is bold 
    ui->tableWidget_user_pass->horizontalHeader()->setHighlightSections(false);
    // The header is not clickable 
    ui->tableWidget_user_pass->horizontalHeader()->setSectionsClickable(false);
    // The table column changes adaptively as the table changes 
    ui->tableWidget_user_pass->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

    // Configure student management table style properties 
    // Odd and even rows alternate colors 
    //ui->tableWidget_student->setAlternatingRowColors(true);
    // When selected, a line is selected as a whole 
    ui->tableWidget_student->setSelectionBehavior(QAbstractItemView::SelectRows);
    // Last line stretch fill 
    //ui->tableWidget_student->horizontalHeader()->setStretchLastSection(true);
    // Check whether the header of a row is bold 
    ui->tableWidget_student->horizontalHeader()->setHighlightSections(false);
    // The header is not clickable 
    ui->tableWidget_student->horizontalHeader()->setSectionsClickable(false);
    // The table column changes adaptively as the table changes 
    ui->tableWidget_student->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

    // Configure the style attribute of student attendance list 
    // Odd and even rows alternate colors 
    //ui->tableWidget_SignIn->setAlternatingRowColors(true);
    // When selected, a line is selected as a whole 
    ui->tableWidget_SignIn->setSelectionBehavior(QAbstractItemView::SelectRows);
    // Last line stretch fill 
    //ui->tableWidget_SignIn->horizontalHeader()->setStretchLastSection(true);
    // Check whether the header of a row is bold 
    ui->tableWidget_SignIn->horizontalHeader()->setHighlightSections(false);
    // The header is not clickable 
    ui->tableWidget_SignIn->horizontalHeader()->setSectionsClickable(false);
    // The table column changes adaptively as the table changes 
    ui->tableWidget_SignIn->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

    // Configure the style properties of the leave list 
    // Odd and even rows alternate colors 
    //ui->tableWidget_SignIn->setAlternatingRowColors(true);
    // When selected, a line is selected as a whole 
    ui->tableWidget_leave->setSelectionBehavior(QAbstractItemView::SelectRows);
    // Last line stretch fill 
    ui->tableWidget_leave->horizontalHeader()->setStretchLastSection(true);
    // Check whether the header of a row is bold 
    ui->tableWidget_leave->horizontalHeader()->setHighlightSections(false);
    // The header is not clickable 
    ui->tableWidget_leave->horizontalHeader()->setSectionsClickable(false);
    // The table column changes adaptively as the table changes 
    //ui->tableWidget_leave->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

    // Update data 
    on_pushButton_update_data_clicked();
    on_pushButton_update_student_clicked();
    on_pushButton_SignIn_update_data_clicked();
    on_pushButton_leave_update_clicked();
    // Timer -- Real time display 
    timer=new QTimer;
    connect(timer, SIGNAL(timeout()), this, SLOT(timer_update()));
    timer->start(1000);
}

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3.4 Leave information storage

// Ask for leave 
void Widget::on_pushButton_leave_clicked()
{
    // Create the student information table of leave module in the database 
    CreateLeaveSurface();

    // Fill in the leave information 
    QString number=ui->lineEdit_leave_number_in->text();
    if(number.isEmpty())
    {
        QMessageBox::information(this," Tips "," Please fill in the student number carefully .",
        QMessageBox::Ok,QMessageBox::Ok);
        return;
    }

    // Reasons for asking for leave 
    QString text=ui->lineEdit_text->text();
    if(text.isEmpty())
    {
        QMessageBox::information(this," Tips "," Please fill in the reason .",
        QMessageBox::Ok,QMessageBox::Ok);
        return;
    }

    Log_Text_Display(QString(" Student ID for leave inquiry :%1.\n").arg(number));

    // Query the student ID selected table 
    // Specify the database for the operation 
    QSqlQuery sql_query(database);
    // Query all data 
    sql_query.prepare("select * from student");
    if(!sql_query.exec())
    {
        Log_Text_Display(" Student database query error .\n");
    }
    else
    {
        bool flag=1;
        while(sql_query.next())
        {
            // ID、 Student number 、 full name 、 Telephone 、 state 
            int find_id = sql_query.value(0).toInt(); //ID
            QString find_number = sql_query.value(1).toString(); // Student number 
            QString find_name = sql_query.value(2).toString();   // full name 
            QString find_phone = sql_query.value(3).toString();  // Telephone 
            QString find_state = sql_query.value(4).toString();  // state 

            //

            // Find student number 
            if(find_number == number)
            {
                flag=0;

                // Returns the number of rows .
                int RowCount=ui->tableWidget_leave->rowCount(); // Get the current total number 
                ui->tableWidget_leave->setRowCount(RowCount+1); // Set the number of lines 
                int i;

                // Create cells from the total number of columns 
                for(i=0;i<ui->tableWidget_leave->columnCount();i++)
                {
                    ui->tableWidget_leave->setItem(RowCount,i,new QTableWidgetItem(""));
                    // Set text alignment 
                    ui->tableWidget_leave->item(RowCount,i)->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);
                }

                // Set check-in status 
                QDateTime current_date_time =QDateTime::currentDateTime();
                QString current_date =current_date_time.toString("yyyy.MM.dd");
                find_state=QString(" Time : %1  Subject matter : %2").arg(current_date).arg(text);

                // Set the data displayed in the table 
                ui->tableWidget_leave->item(RowCount,0)->setText(find_number);
                ui->tableWidget_leave->item(RowCount,1)->setText(find_name);
                ui->tableWidget_leave->item(RowCount,2)->setText(find_phone);
                ui->tableWidget_leave->item(RowCount,3)->setText(find_state);

                // Put it in the database 

                // Ready to insert data 
                // The most inquired ID
                QString select_max_sql = "select max(id) from leave";
                int max_id = 0;
                sql_query.prepare(select_max_sql);
                if(!sql_query.exec())
                {
                    Log_Text_Display(" The leave form is the largest ID To find the failure .\n");
                }
                else
                {
                    while(sql_query.next())
                    {
                        max_id = sql_query.value(0).toInt();
                    }
                    Log_Text_Display(QString("data base max id:%1\n").arg(max_id));

                    // Add data 
                    // insert data   Insert statement ：insert into <table_name> values (value1, value2,…);
                    QString insert_sql = tr("insert into leave values(?,?,?,?,?)");
                    sql_query.prepare(insert_sql);
                    //ID、 Student number 、 full name 、 Telephone 、 Subject matter 
                    sql_query.addBindValue(max_id+1); //id
                    sql_query.addBindValue(find_number);
                    sql_query.addBindValue(find_name);
                    sql_query.addBindValue(find_phone);
                    sql_query.addBindValue(find_state);
                    if(!sql_query.exec())
                    {
                        Log_Text_Display(" Failed to insert leave form data .\n");
                        return;
                    }
                    else // Insert the success 
                    {
                        // If the insertion succeeds, the page will be cleared 
                        ui->lineEdit_leave_number_in->clear();
                        ui->lineEdit_text->clear();
                    }
                }
                break;
            }
        }
        if(flag)
        {
            QMessageBox::information(this," Tips "," This student ID is not found .",
            QMessageBox::Ok,QMessageBox::Ok);
            return;
        }
    }
}

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