Qt 5.9 | Qt SQL | C++ Classes | QSqlRelationalDelegate

Qt 5.9.9 Reference Documentation

# QSqlRelationalDelegate Class

The QSqlRelationalDelegate class provides a delegate that is used to display and edit data from a QSqlRelationalTableModel. More...

Header: | #include <QSqlRelationalDelegate>
qmake: | QT += sql

- List of all members, including inherited members

## Public Functions

| QSqlRelationalDelegate(QObject *parent = nullptr)
| ~QSqlRelationalDelegate()
QWidget * | createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override
void | setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override

## Detailed Description

The QSqlRelationalDelegate class provides a delegate that is used to display and edit data from a QSqlRelationalTableModel.

Unlike the default delegate, QSqlRelationalDelegate provides a combobox for fields that are foreign keys into other tables. To use the class, simply call QAbstractItemView::setItemDelegate() on the view with an instance of QSqlRelationalDelegate:

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

The Relational Table Model example (shown below) illustrates how to use QSqlRelationalDelegate in conjunction with QSqlRelationalTableModel to provide tables with foreign key support.

See also QSqlRelationalTableModel and Model/View Programming.

## Member Function Documentation

### QSqlRelationalDelegate::QSqlRelationalDelegate(QObject *parent = nullptr)

Constructs a QSqlRelationalDelegate object with the given parent.

### QSqlRelationalDelegate::~QSqlRelationalDelegate()

Destroys the QSqlRelationalDelegate object and frees any allocated resources.

### QWidget *QSqlRelationalDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const

### void QSqlRelationalDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const