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Sqlite change Row Value

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  • A Aioria

    @JonB
    Thank you for the answer. I have another question. I tried that but not made changes. I have to reescribe the entire code about CREATE the table? I do that with QString. Maybe i need to do it with QSqlQuery. Here is the code:

    void MainWindow::CreateStudentTable()
    {
        QString consult;
        consult.append("CREATE TABLE IF NOT EXISTS students("
                        "id INTEGER PRIMARY KEY AUTOINCREMENT,"
                       "name VARCHAR(100),"
                        "lastName VARCHAR(100), "
                        "faults INTEGER NOT NULL"
                       ");");
    
        QSqlQuery create;
        create.prepare(consult);
    
        if(create.exec()){
            qDebug()<<"The table STUDENT exists.";
        }else{
            qDebug()<<"The table STUDENTS doesnt exists";
            qDebug()<<"ERROR! " << create.lastError();
        }
    }
    
    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #11

    @Aioria said in Sqlite change Row Value:

    I tried that but not made changes

    What do you mean? Was the table not created? What does create.lastError() return?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    A 1 Reply Last reply
    1
    • jsulmJ jsulm

      @Aioria said in Sqlite change Row Value:

      I tried that but not made changes

      What do you mean? Was the table not created? What does create.lastError() return?

      A Offline
      A Offline
      Aioria
      wrote on last edited by
      #12

      @jsulm

      I mean that i do this

      for (int i = 0; i < rowCount; i++)
      {
          if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
          {
              QSqlQuery update;
              update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id");
              update.bindValue(":id", i);
              update.exec()
          }
      }
      

      And when i want to save the state, don't increment the faults. I think that the problem is in ID and Faults but i can't make it work

      JonBJ 1 Reply Last reply
      0
      • A Aioria

        @jsulm

        I mean that i do this

        for (int i = 0; i < rowCount; i++)
        {
            if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
            {
                QSqlQuery update;
                update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id");
                update.bindValue(":id", i);
                update.exec()
            }
        }
        

        And when i want to save the state, don't increment the faults. I think that the problem is in ID and Faults but i can't make it work

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #13

        @Aioria
        In principle this code looks correct/reasonable. Don't understand what you say is the problem? Does the above not increment correctly. You should check the return result of exec() at least in case there is an error? Print out the value of i and make sure that is the desired id in the table. Otherwise do you have anything like SQL Workbench for SQLite where you can test these statements?

        A 1 Reply Last reply
        4
        • JonBJ JonB

          @Aioria
          In principle this code looks correct/reasonable. Don't understand what you say is the problem? Does the above not increment correctly. You should check the return result of exec() at least in case there is an error? Print out the value of i and make sure that is the desired id in the table. Otherwise do you have anything like SQL Workbench for SQLite where you can test these statements?

          A Offline
          A Offline
          Aioria
          wrote on last edited by
          #14

          @JonB
          Yes, i don't understand why. I do the test and there is no error. I can copy the code and see if can get the error. I don't have Workbench, you say that if i try the statements in the workbench maybe can see the error?

          Here is the code:

          MainWindow::MainWindow(QWidget *parent) :
              QMainWindow(parent),
              ui(new Ui::MainWindow)
          {
              ui->setupUi(this);
          
          
              qDebug()<<"init application...";
          
              QString name;
              name.append("Datbase1.sqlite");
          
              db = QSqlDatabase::addDatabase("QSQLITE");
              db.setDatabaseName(name);
          
              if (!QSqlDatabase::isDriverAvailable("QSQLITE")){
                  qDebug()<< "Error: QSQLITE is not available";
              }
          
              if(db.open()) {
                  qDebug()<<"Successfull Conected .";
              }else{
                      qDebug()<<"ERROR! NOT connected to the database.";
                  }
          
              CreateStudentTable();
              int row = ShowData();
              setWindowTitle(QString ("Assistance"));
              QList<QString> items;
              for (int i = 0; i<row;i++)
              {
                  items.append("" + QString::number(i));
              }
              QListIterator <QString> itr(items);
              while(itr.hasNext())
              {
                  QListWidgetItem *item = new QListWidgetItem(itr.next());
                  item->setCheckState(Qt::Unchecked);
                  ui->listWidget->addItem(item);
              }
          
              ShowData();
          }
          
          
          void MainWindow::insertStudent()
          {
          
              QSqlQuery consult;
              consult.prepare("INSERT INTO students("
                              "name,"
                               "lastName, "
                               "faults)"
                               "VALUES("
                                "'"+ui->lineEditName->text()+"',"
                                "'"+ui->lineEditLastName->text()+"',"
                                "'"+ui->lineEditFaults->text()+"'"
                               ");");
          
          
             if(consult.exec()){
                 qDebug()<<"The Student is added.";
             }else{
                 qDebug()<<"The Student IS NOT added";
                 qDebug()<<"ERROR! " << consult.lastError();
             }
          }
          
          void MainWindow::deleteStudent()
          {
              QString consult;
              consult.append("DELETE FROM students WHERE name= '"+ui->lineEditName->text()+"'and lastName= '"+ui->lineEditLastName->text()+"'");
          
          
              QSqlQuery deleteS;
              deleteS.prepare(consult);
          
              if(deleteS.exec()){
                  qDebug()<<"The student is successfull deleted.";
              }else{
                  qDebug()<<"The student IS NOT successfull deleted";
                  qDebug()<<"ERROR! " << deleteS.lastError();
              }
          
          }
          
          int MainWindow::ShowData()
          {
              QString consult;
              consult.append("SELECT * FROM students");
          
              QSqlQuery show;
              show.prepare(consult);
          
              if(show.exec()){
                  qDebug()<<"The STUDENT has consulted correctly.";
              }else{
                  qDebug()<<"The STUDENT HAS NOT consulted correctly";
                  qDebug()<<"ERROR! " << show.lastError();
              }
          
              int row = 0;
              ui->tableWidgetData->setRowCount(0);
          
          
              while(show.next()){
                  ui->tableWidgetData->insertRow(row);
                  ui->tableWidgetData->setItem(row,0,new QTableWidgetItem (show.value(1).toByteArray().constData()));
                  ui->tableWidgetData->setItem(row,1,new QTableWidgetItem (show.value(2).toByteArray().constData()));
                  ui->tableWidgetData->setItem(row,2,new QTableWidgetItem (show.value(3).toByteArray().constData()));
                  row++;
              }
              ui->tableWidgetData->horizontalHeader()->setStretchLastSection(true);
              return row;
          }
          
          
          void MainWindow::chequedState(){
          
              int rowCount = ui->listWidget->count();
          
              for (int i = 0; i < rowCount; i++)
              {
                  if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
                  {
                      QSqlQuery update;
                      update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id");
                      update.bindValue(":id", i);
                      update.exec();
                  }
              }
          
          }
          
          
          void MainWindow::on_pushButtonAddStudent_clicked()
          {
              insertStudent();
              ShowData();
          }
          
          
          
          void MainWindow::on_pushButtonDeleteStudent_clicked()
          {
              deleteStudent();
              ShowData();
          }
          
          
          
          void MainWindow::on_pushButton_clicked()
          {
          
              chequedState();
              ShowData();
          }
          
          

          Maybe the error is in the Buttons or in the list of the check boxes that are separate from the table.

          jsulmJ JonBJ 2 Replies Last reply
          0
          • A Aioria

            @JonB
            Yes, i don't understand why. I do the test and there is no error. I can copy the code and see if can get the error. I don't have Workbench, you say that if i try the statements in the workbench maybe can see the error?

            Here is the code:

            MainWindow::MainWindow(QWidget *parent) :
                QMainWindow(parent),
                ui(new Ui::MainWindow)
            {
                ui->setupUi(this);
            
            
                qDebug()<<"init application...";
            
                QString name;
                name.append("Datbase1.sqlite");
            
                db = QSqlDatabase::addDatabase("QSQLITE");
                db.setDatabaseName(name);
            
                if (!QSqlDatabase::isDriverAvailable("QSQLITE")){
                    qDebug()<< "Error: QSQLITE is not available";
                }
            
                if(db.open()) {
                    qDebug()<<"Successfull Conected .";
                }else{
                        qDebug()<<"ERROR! NOT connected to the database.";
                    }
            
                CreateStudentTable();
                int row = ShowData();
                setWindowTitle(QString ("Assistance"));
                QList<QString> items;
                for (int i = 0; i<row;i++)
                {
                    items.append("" + QString::number(i));
                }
                QListIterator <QString> itr(items);
                while(itr.hasNext())
                {
                    QListWidgetItem *item = new QListWidgetItem(itr.next());
                    item->setCheckState(Qt::Unchecked);
                    ui->listWidget->addItem(item);
                }
            
                ShowData();
            }
            
            
            void MainWindow::insertStudent()
            {
            
                QSqlQuery consult;
                consult.prepare("INSERT INTO students("
                                "name,"
                                 "lastName, "
                                 "faults)"
                                 "VALUES("
                                  "'"+ui->lineEditName->text()+"',"
                                  "'"+ui->lineEditLastName->text()+"',"
                                  "'"+ui->lineEditFaults->text()+"'"
                                 ");");
            
            
               if(consult.exec()){
                   qDebug()<<"The Student is added.";
               }else{
                   qDebug()<<"The Student IS NOT added";
                   qDebug()<<"ERROR! " << consult.lastError();
               }
            }
            
            void MainWindow::deleteStudent()
            {
                QString consult;
                consult.append("DELETE FROM students WHERE name= '"+ui->lineEditName->text()+"'and lastName= '"+ui->lineEditLastName->text()+"'");
            
            
                QSqlQuery deleteS;
                deleteS.prepare(consult);
            
                if(deleteS.exec()){
                    qDebug()<<"The student is successfull deleted.";
                }else{
                    qDebug()<<"The student IS NOT successfull deleted";
                    qDebug()<<"ERROR! " << deleteS.lastError();
                }
            
            }
            
            int MainWindow::ShowData()
            {
                QString consult;
                consult.append("SELECT * FROM students");
            
                QSqlQuery show;
                show.prepare(consult);
            
                if(show.exec()){
                    qDebug()<<"The STUDENT has consulted correctly.";
                }else{
                    qDebug()<<"The STUDENT HAS NOT consulted correctly";
                    qDebug()<<"ERROR! " << show.lastError();
                }
            
                int row = 0;
                ui->tableWidgetData->setRowCount(0);
            
            
                while(show.next()){
                    ui->tableWidgetData->insertRow(row);
                    ui->tableWidgetData->setItem(row,0,new QTableWidgetItem (show.value(1).toByteArray().constData()));
                    ui->tableWidgetData->setItem(row,1,new QTableWidgetItem (show.value(2).toByteArray().constData()));
                    ui->tableWidgetData->setItem(row,2,new QTableWidgetItem (show.value(3).toByteArray().constData()));
                    row++;
                }
                ui->tableWidgetData->horizontalHeader()->setStretchLastSection(true);
                return row;
            }
            
            
            void MainWindow::chequedState(){
            
                int rowCount = ui->listWidget->count();
            
                for (int i = 0; i < rowCount; i++)
                {
                    if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
                    {
                        QSqlQuery update;
                        update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id");
                        update.bindValue(":id", i);
                        update.exec();
                    }
                }
            
            }
            
            
            void MainWindow::on_pushButtonAddStudent_clicked()
            {
                insertStudent();
                ShowData();
            }
            
            
            
            void MainWindow::on_pushButtonDeleteStudent_clicked()
            {
                deleteStudent();
                ShowData();
            }
            
            
            
            void MainWindow::on_pushButton_clicked()
            {
            
                chequedState();
                ShowData();
            }
            
            

            Maybe the error is in the Buttons or in the list of the check boxes that are separate from the table.

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #15

            @Aioria said in Sqlite change Row Value:

            I don't have Workbench

            You can simply use the command line tool delivered together with SQLite.

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            1 Reply Last reply
            3
            • mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #16

              Hi
              There is also
              https://sqlitebrowser.org/

              1 Reply Last reply
              3
              • A Aioria

                @JonB
                Yes, i don't understand why. I do the test and there is no error. I can copy the code and see if can get the error. I don't have Workbench, you say that if i try the statements in the workbench maybe can see the error?

                Here is the code:

                MainWindow::MainWindow(QWidget *parent) :
                    QMainWindow(parent),
                    ui(new Ui::MainWindow)
                {
                    ui->setupUi(this);
                
                
                    qDebug()<<"init application...";
                
                    QString name;
                    name.append("Datbase1.sqlite");
                
                    db = QSqlDatabase::addDatabase("QSQLITE");
                    db.setDatabaseName(name);
                
                    if (!QSqlDatabase::isDriverAvailable("QSQLITE")){
                        qDebug()<< "Error: QSQLITE is not available";
                    }
                
                    if(db.open()) {
                        qDebug()<<"Successfull Conected .";
                    }else{
                            qDebug()<<"ERROR! NOT connected to the database.";
                        }
                
                    CreateStudentTable();
                    int row = ShowData();
                    setWindowTitle(QString ("Assistance"));
                    QList<QString> items;
                    for (int i = 0; i<row;i++)
                    {
                        items.append("" + QString::number(i));
                    }
                    QListIterator <QString> itr(items);
                    while(itr.hasNext())
                    {
                        QListWidgetItem *item = new QListWidgetItem(itr.next());
                        item->setCheckState(Qt::Unchecked);
                        ui->listWidget->addItem(item);
                    }
                
                    ShowData();
                }
                
                
                void MainWindow::insertStudent()
                {
                
                    QSqlQuery consult;
                    consult.prepare("INSERT INTO students("
                                    "name,"
                                     "lastName, "
                                     "faults)"
                                     "VALUES("
                                      "'"+ui->lineEditName->text()+"',"
                                      "'"+ui->lineEditLastName->text()+"',"
                                      "'"+ui->lineEditFaults->text()+"'"
                                     ");");
                
                
                   if(consult.exec()){
                       qDebug()<<"The Student is added.";
                   }else{
                       qDebug()<<"The Student IS NOT added";
                       qDebug()<<"ERROR! " << consult.lastError();
                   }
                }
                
                void MainWindow::deleteStudent()
                {
                    QString consult;
                    consult.append("DELETE FROM students WHERE name= '"+ui->lineEditName->text()+"'and lastName= '"+ui->lineEditLastName->text()+"'");
                
                
                    QSqlQuery deleteS;
                    deleteS.prepare(consult);
                
                    if(deleteS.exec()){
                        qDebug()<<"The student is successfull deleted.";
                    }else{
                        qDebug()<<"The student IS NOT successfull deleted";
                        qDebug()<<"ERROR! " << deleteS.lastError();
                    }
                
                }
                
                int MainWindow::ShowData()
                {
                    QString consult;
                    consult.append("SELECT * FROM students");
                
                    QSqlQuery show;
                    show.prepare(consult);
                
                    if(show.exec()){
                        qDebug()<<"The STUDENT has consulted correctly.";
                    }else{
                        qDebug()<<"The STUDENT HAS NOT consulted correctly";
                        qDebug()<<"ERROR! " << show.lastError();
                    }
                
                    int row = 0;
                    ui->tableWidgetData->setRowCount(0);
                
                
                    while(show.next()){
                        ui->tableWidgetData->insertRow(row);
                        ui->tableWidgetData->setItem(row,0,new QTableWidgetItem (show.value(1).toByteArray().constData()));
                        ui->tableWidgetData->setItem(row,1,new QTableWidgetItem (show.value(2).toByteArray().constData()));
                        ui->tableWidgetData->setItem(row,2,new QTableWidgetItem (show.value(3).toByteArray().constData()));
                        row++;
                    }
                    ui->tableWidgetData->horizontalHeader()->setStretchLastSection(true);
                    return row;
                }
                
                
                void MainWindow::chequedState(){
                
                    int rowCount = ui->listWidget->count();
                
                    for (int i = 0; i < rowCount; i++)
                    {
                        if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
                        {
                            QSqlQuery update;
                            update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id");
                            update.bindValue(":id", i);
                            update.exec();
                        }
                    }
                
                }
                
                
                void MainWindow::on_pushButtonAddStudent_clicked()
                {
                    insertStudent();
                    ShowData();
                }
                
                
                
                void MainWindow::on_pushButtonDeleteStudent_clicked()
                {
                    deleteStudent();
                    ShowData();
                }
                
                
                
                void MainWindow::on_pushButton_clicked()
                {
                
                    chequedState();
                    ShowData();
                }
                
                

                Maybe the error is in the Buttons or in the list of the check boxes that are separate from the table.

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #17

                @Aioria

                • If you are saying you are not sure whether your chequedState() is even being hit, you should put in a debug statement to verify you are getting there.

                • You still have not checked the return result of the update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id"); which you say is not working. [EDIT Sorry, I meant the update.exec() which follows that line.]

                • You can check your statement by typing

                UPDATE students SET faults = faults + 1 WHERE id = 1
                

                into a SQLite command-line/client tool. You can & should get this set up. Once you have done so you can test your proposed SQL statements directly, before you put them into your program. This makes it easier to develop correctly.

                A 2 Replies Last reply
                2
                • VRoninV Offline
                  VRoninV Offline
                  VRonin
                  wrote on last edited by
                  #18

                  Quick question: how do you add the checkboxes to ui->listWidget?

                  "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                  ~Napoleon Bonaparte

                  On a crusade to banish setIndexWidget() from the holy land of Qt

                  A 1 Reply Last reply
                  2
                  • JonBJ JonB

                    @Aioria

                    • If you are saying you are not sure whether your chequedState() is even being hit, you should put in a debug statement to verify you are getting there.

                    • You still have not checked the return result of the update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id"); which you say is not working. [EDIT Sorry, I meant the update.exec() which follows that line.]

                    • You can check your statement by typing

                    UPDATE students SET faults = faults + 1 WHERE id = 1
                    

                    into a SQLite command-line/client tool. You can & should get this set up. Once you have done so you can test your proposed SQL statements directly, before you put them into your program. This makes it easier to develop correctly.

                    A Offline
                    A Offline
                    Aioria
                    wrote on last edited by
                    #19

                    @JonB
                    Yes i did that and dont throw a error and i delete it from the code. I will try to do that in the page of sqlite

                    1 Reply Last reply
                    0
                    • VRoninV VRonin

                      Quick question: how do you add the checkboxes to ui->listWidget?

                      A Offline
                      A Offline
                      Aioria
                      wrote on last edited by
                      #20

                      @VRonin @JonB
                      Yes, here i add the checkboxes

                      int row = ShowData();
                          setWindowTitle(QString ("Assistance"));
                          QList<QString> items;
                          for (int i = 0; i<row;i++)
                          {
                              items.append("" + QString::number(i));
                          }
                          QListIterator <QString> itr(items);
                          while(itr.hasNext())
                          {
                              QListWidgetItem *item = new QListWidgetItem(itr.next());
                              item->setCheckState(Qt::Unchecked);
                              ui->listWidget->addItem(item);
                          }
                      
                      

                      Maybe the error ocurred here in the creation of the checkboxes and i need to do it in other function and other way

                      1 Reply Last reply
                      0
                      • JonBJ JonB

                        @Aioria

                        • If you are saying you are not sure whether your chequedState() is even being hit, you should put in a debug statement to verify you are getting there.

                        • You still have not checked the return result of the update.prepare("UPDATE students SET faults = faults + 1 WHERE id = :id"); which you say is not working. [EDIT Sorry, I meant the update.exec() which follows that line.]

                        • You can check your statement by typing

                        UPDATE students SET faults = faults + 1 WHERE id = 1
                        

                        into a SQLite command-line/client tool. You can & should get this set up. Once you have done so you can test your proposed SQL statements directly, before you put them into your program. This makes it easier to develop correctly.

                        A Offline
                        A Offline
                        Aioria
                        wrote on last edited by Aioria
                        #21

                        @JonB I test it and if i do this:

                        UPDATE students SET faults = faults + 1 WHERE id = id
                        

                        then increment by 3 all the faults and if i uncheck one, increment all by 1. So now the thing is in the for loop. im trying to change it

                        1 Reply Last reply
                        0
                        • A Offline
                          A Offline
                          Aioria
                          wrote on last edited by
                          #22

                          @JonB @jsulm
                          Can anyone help me with this last thing?

                          void MainWindow::chequedState(int i){
                          
                              if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
                              {
                                  QSqlQuery update;
                                  update.bindValue(":id", i);
                                  update.prepare("UPDATE students SET faults = faults + 1 WHERE id");
                                  update.exec();
                              }
                          
                          
                          }
                          /void MainWindow::saveAssistence()
                          {
                              int rowCount = ui->listWidget->count();
                          
                              for (int i = 0; i < rowCount; i++)
                              {
                                  chequedState(i);
                              }
                          
                          
                          }
                          

                          I have this 2 functions and increments in 3 instead in 1 each row.

                          Thank you!

                          jsulmJ 1 Reply Last reply
                          0
                          • A Aioria

                            @JonB @jsulm
                            Can anyone help me with this last thing?

                            void MainWindow::chequedState(int i){
                            
                                if (ui->listWidget->item(i)->checkState() == Qt::Unchecked)
                                {
                                    QSqlQuery update;
                                    update.bindValue(":id", i);
                                    update.prepare("UPDATE students SET faults = faults + 1 WHERE id");
                                    update.exec();
                                }
                            
                            
                            }
                            /void MainWindow::saveAssistence()
                            {
                                int rowCount = ui->listWidget->count();
                            
                                for (int i = 0; i < rowCount; i++)
                                {
                                    chequedState(i);
                                }
                            
                            
                            }
                            

                            I have this 2 functions and increments in 3 instead in 1 each row.

                            Thank you!

                            jsulmJ Offline
                            jsulmJ Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on last edited by
                            #23

                            @Aioria said in Sqlite change Row Value:

                            UPDATE students SET faults = faults + 1 WHERE id

                            please take a closer look at the WHERE part of your update query...

                            https://forum.qt.io/topic/113070/qt-code-of-conduct

                            A 1 Reply Last reply
                            2
                            • jsulmJ jsulm

                              @Aioria said in Sqlite change Row Value:

                              UPDATE students SET faults = faults + 1 WHERE id

                              please take a closer look at the WHERE part of your update query...

                              A Offline
                              A Offline
                              Aioria
                              wrote on last edited by
                              #24

                              @jsulm
                              I tried to put =: id but don't do nothing. I think that the problem is in the for. Maybe another way to do it. This increment all the rows in the quantity of rows that the table have...

                              jsulmJ 1 Reply Last reply
                              0
                              • A Aioria

                                @jsulm
                                I tried to put =: id but don't do nothing. I think that the problem is in the for. Maybe another way to do it. This increment all the rows in the quantity of rows that the table have...

                                jsulmJ Offline
                                jsulmJ Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #25

                                @Aioria Are you sure the row number in the list widget is the correct ID in the table?!

                                https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                • jsulmJ jsulm

                                  @Aioria Are you sure the row number in the list widget is the correct ID in the table?!

                                  A Offline
                                  A Offline
                                  Aioria
                                  wrote on last edited by
                                  #26

                                  @jsulm I think with the :id, i , i put the value of i in the id.
                                  How can i check that and how can i do to make an union between the list and the table?

                                  CreateStudentTable();
                                      int row = ShowData();
                                      setWindowTitle(QString ("Asistencia"));
                                      QList<QString> items;
                                      for (int i = 0; i<row;i++)
                                      {
                                          items.append("" + QString::number(i));
                                      }
                                      QListIterator <QString> itr(items);
                                      while(itr.hasNext())
                                      {
                                          QListWidgetItem *item = new QListWidgetItem(itr.next());
                                          item->setCheckState(Qt::Unchecked);
                                          ui->listWidget->addItem(item);
                                      }
                                  
                                      ShowData();
                                  

                                  This is the code that creates the list with the checkbox

                                  Pablo J. RoginaP jsulmJ 2 Replies Last reply
                                  0
                                  • A Aioria

                                    @jsulm I think with the :id, i , i put the value of i in the id.
                                    How can i check that and how can i do to make an union between the list and the table?

                                    CreateStudentTable();
                                        int row = ShowData();
                                        setWindowTitle(QString ("Asistencia"));
                                        QList<QString> items;
                                        for (int i = 0; i<row;i++)
                                        {
                                            items.append("" + QString::number(i));
                                        }
                                        QListIterator <QString> itr(items);
                                        while(itr.hasNext())
                                        {
                                            QListWidgetItem *item = new QListWidgetItem(itr.next());
                                            item->setCheckState(Qt::Unchecked);
                                            ui->listWidget->addItem(item);
                                        }
                                    
                                        ShowData();
                                    

                                    This is the code that creates the list with the checkbox

                                    Pablo J. RoginaP Offline
                                    Pablo J. RoginaP Offline
                                    Pablo J. Rogina
                                    wrote on last edited by
                                    #27

                                    @Aioria please try to not double post. I know, that post is Spanish but you're trying to solve the same issue :-)

                                    Upvote the answer(s) that helped you solve the issue
                                    Use "Topic Tools" button to mark your post as Solved
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                                    Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #28

                                      @Pablo-J-Rogina it's usually the only case where double posting is allowed since it's in the poster native language and therefor might get an answer that's easier to understand.

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                      Pablo J. RoginaP 1 Reply Last reply
                                      1
                                      • SGaistS SGaist

                                        @Pablo-J-Rogina it's usually the only case where double posting is allowed since it's in the poster native language and therefor might get an answer that's easier to understand.

                                        Pablo J. RoginaP Offline
                                        Pablo J. RoginaP Offline
                                        Pablo J. Rogina
                                        wrote on last edited by
                                        #29

                                        @SGaist got it, it's learnt since now on forward. Thank you for the clarification.

                                        Upvote the answer(s) that helped you solve the issue
                                        Use "Topic Tools" button to mark your post as Solved
                                        Add screenshots via postimage.org
                                        Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

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                                        • A Aioria

                                          @jsulm I think with the :id, i , i put the value of i in the id.
                                          How can i check that and how can i do to make an union between the list and the table?

                                          CreateStudentTable();
                                              int row = ShowData();
                                              setWindowTitle(QString ("Asistencia"));
                                              QList<QString> items;
                                              for (int i = 0; i<row;i++)
                                              {
                                                  items.append("" + QString::number(i));
                                              }
                                              QListIterator <QString> itr(items);
                                              while(itr.hasNext())
                                              {
                                                  QListWidgetItem *item = new QListWidgetItem(itr.next());
                                                  item->setCheckState(Qt::Unchecked);
                                                  ui->listWidget->addItem(item);
                                              }
                                          
                                              ShowData();
                                          

                                          This is the code that creates the list with the checkbox

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by jsulm
                                          #30

                                          @Aioria said in Sqlite change Row Value:

                                          I think with the :id, i , i put the value of i in the id

                                          Yes, you do and this is a bad idea. The id of an item in the database should not be its row number in some widget in your UI! What happens, for example, if you order/sort the items differently? Then suddenly all your IDs are wrong.
                                          You can use http://doc.qt.io/qt-5/qlistwidgetitem.html#setData to set the database ID in your items and then get it using http://doc.qt.io/qt-5/qlistwidgetitem.html#data

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          A 1 Reply Last reply
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