- Qt 5.5
- Qt SQL
- C++ Classes
- QSqlRelationalDelegate
- Qt 5.5.1 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
Inherits: |

- List of all members, including inherited members

## Public Functions

| QSqlRelationalDelegate(QObject * parent = 0)
| ~QSqlRelationalDelegate()
QWidget * | createEditor(QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index) const
void | setModelData(QWidget * editor, QAbstractItemModel * model, const QModelIndex & index) const

## 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 = 0)

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