Qt 5.11 | Qt SQL | Cached Table Example | tableeditor.cpp Example File

Qt 5.11.3 Reference Documentation

# tableeditor.cpp Example File

cachedtable/tableeditor.cpp

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      #include <QtWidgets>
      #include <QtSql>

      #include "tableeditor.h"

      TableEditor::TableEditor(const QString &tableName, QWidget *parent)
          : QWidget(parent)
      {
          model = new QSqlTableModel(this);
          model->setTable(tableName);
          model->setEditStrategy(QSqlTableModel::OnManualSubmit);
          model->select();

          model->setHeaderData(0, Qt::Horizontal, tr("ID"));
          model->setHeaderData(1, Qt::Horizontal, tr("First name"));
          model->setHeaderData(2, Qt::Horizontal, tr("Last name"));

          QTableView *view = new QTableView;
          view->setModel(model);
          view->resizeColumnsToContents();

          submitButton = new QPushButton(tr("Submit"));
          submitButton->setDefault(true);
          revertButton = new QPushButton(tr("&Revert"));
          quitButton = new QPushButton(tr("Quit"));

          buttonBox = new QDialogButtonBox(Qt::Vertical);
          buttonBox->addButton(submitButton, QDialogButtonBox::ActionRole);
          buttonBox->addButton(revertButton, QDialogButtonBox::ActionRole);
          buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

          connect(submitButton, &QPushButton::clicked, this, &TableEditor::submit);
          connect(revertButton, &QPushButton::clicked,  model, &QSqlTableModel::revertAll);
          connect(quitButton, &QPushButton::clicked, this, &TableEditor::close);

          QHBoxLayout *mainLayout = new QHBoxLayout;
          mainLayout->addWidget(view);
          mainLayout->addWidget(buttonBox);
          setLayout(mainLayout);

          setWindowTitle(tr("Cached Table"));
      }

      void TableEditor::submit()
      {
          model->database().transaction();
          if (model->submitAll()) {
              model->database().commit();
          } else {
              model->database().rollback();
              QMessageBox::warning(this, tr("Cached Table"),
                                   tr("The database reported an error: %1")
                                   .arg(model->lastError().text()));
          }
      }