QtableView add a check box

Create a Qt widgets application and mainwindow.cpp file modify the code as follows

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

#include <QMessageBox>
#include <QSqlDatabase>
#include <QDebug>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QTableView>

#include <QSqlTableModel>

static bool createConnectionDateBase()
{
    Db QSqlDatabase = QSqlDatabase :: addDatabase ( " QSQLITE " ) ;; // create QSQLdatabase object that specifies what kind of SQL QT used. 
    db.setDatabaseName ( " testSQL.db " );
     IF (! db.Open ())
    {
        :: Critical QMessageBox (NULL, " open the database failed " , " open the database failed! " ,
                              QMessageBox::Cancel);
        return false;
    }
    QSqlQuery query;
    query.exec("create table TEST_SQL (id int(1) primary key,name char(200),age int(1),chenked int (1))");

    query.exec("insert into TEST_SQL values(1,'测试1',18,0)");
    query.exec("insert into TEST_SQL values(2,'测试2',19,0)");
    query.exec("insert into TEST_SQL values(3,'测试3',20,0)");
    return true;
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    if(!createConnectionDateBase())
    {
        return;
    }

    model = new QSqlTableModel(this);
    model->setTable("TEST_SQL");
    model->setHeaderData(0,Qt::Horizontal,tr("ID号"));
    model->setHeaderData(1,Qt::Horizontal,tr("姓名"));
    Model -> setHeaderData ( 2 , Qt :: Horizontal, TR ( " Age " ));
    model->select();
    QTableView *view = new QTableView(this);
    view->setModel(model);
    setCentralWidget(view);
    //ui->tableView->setModel(model);

}

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

Run to see the effect,

 

 Now add to this list box, you need to inherit QSqlTableModel class in the project Add new, a new C ++ class, named myTableModel, then the resulting mytablemodel.h and metaoblemodel.cpp amended as follows:

#ifndef MYTABLEMODEL_H
#define MYTABLEMODEL_H

#include <QtSql>

class myTableModel:public QSqlTableModel
{
    Q_OBJECT
public:
    myTableModel( QObject * parent = 0, QSqlDatabase db = QSqlDatabase() );

    bool setData( const QModelIndex &index, const QVariant &value, int role );
    QVariant data(const QModelIndex &index, int role) const;
    Qt::ItemFlags flags(const QModelIndex &index) const;
};

#endif // MYTABLEMODEL_H

#include "mytablemodel.h"

The QMap < int , the CheckState the Qt ::> check_state_map;
 int checkColumn =. 3; // the second box into several columns, counted from 0 

myTableModel :: myTableModel (QObject * parent, QSqlDatabase DB)
{

}

bool myTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if(!index.isValid())
        return false;


    if (role == Qt::CheckStateRole && index.column() == checkColumn)
    {
        check_state_map[index.row()] = (value == Qt::Checked ? Qt::Checked : Qt::Unchecked);return true;
    }
    else
        return QSqlTableModel::setData(index, value,role);
}

QVariant myTableModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();
    if (index.column() != checkColumn )
    {
        return QSqlTableModel::data(index, role);
    }
    switch(role)
    {
        case Qt::CheckStateRole:
        if(index.column() == checkColumn)
        {
            if (check_state_map.contains(index.row()))
            {

                return check_state_map[index.row()] == Qt::Checked ? Qt::Checked : Qt::Unchecked;
            }

            return Qt::Unchecked;
        }
        default:
            return QVariant();
    }
    return QVariant();
}

Qt::ItemFlags myTableModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return 0;
    if (index.column() == checkColumn)
        return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsUserCheckable;
    else
        return QSqlTableModel::flags(index);
    return  Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}

Then the file header contains the mianwindow.cpp mytablemodel.h mianwindow.cpp constructor then modified as follows:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    if(!createConnectionDateBase())
    {
        return;
    }

    model = new myTableModel(this);
    model->setTable("TEST_SQL");
    model->setHeaderData(0,Qt::Horizontal,tr("ID号"));
    model->setHeaderData(1,Qt::Horizontal,tr("姓名"));
    Model -> setHeaderData ( 2 , Qt :: Horizontal, TR ( " Age " ));
    model->select();
    QTableView *view = new QTableView(this);
    view->setModel(model);
    setCentralWidget(view);
    //ui->tableView->setModel(model);

}

And then run to see results

 

Check box has appeared in the first three.

As to how to know if it is selected,

 

In myTableModel.cpp file in check_state_map, check_state_map [i] value is the value of the i-th row CheckBox.