QSqlRelationalDelegate Class

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

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The Qt Company Ltd.

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Publié le 27 décembre 2024 - Mis à jour le 27 décembre 2024

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QSqlRelationalDelegate Class▲

Header: QSqlRelationalDelegate
CMake:

find_package(Qt6 REQUIRED COMPONENTS Sql)

target_link_libraries(mytarget PRIVATE Qt6::Sql)
qmake: QT += sql
Inherits: QStyledItemDelegate

Detailed Description▲

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:

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    std::unique_ptr&lt;QTableView&gt; view{new QTableView};
    view-&gt;setModel(model);
    view-&gt;setItemDelegate(new QSqlRelationalDelegate(view.get()));

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

Member Function Documentation▲

[explicit] QSqlRelationalDelegate::QSqlRelationalDelegate(QObject *parent = nullptr)▲

Constructs a QSqlRelationalDelegate object with the given parent.

[virtual] QSqlRelationalDelegate::~QSqlRelationalDelegate()▲

Destroys the QSqlRelationalDelegate object and frees any allocated resources.

[override virtual] QWidget QSqlRelationalDelegate::createEditor(QWidget parent, const QStyleOptionViewItem &option, const QModelIndex &index) const▲

Reimplements: QStyledItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const.

[override virtual] void QSqlRelationalDelegate::setModelData(QWidget editor, QAbstractItemModel model, const QModelIndex &index) const▲

Reimplements: QStyledItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const.

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