The QDataTable class provides a flexible SQL table widget that supports browsing and editing.
More...
Detailed Description
The QDataTable class provides a flexible SQL table widget that supports browsing and editing.
QDataTable supports various functions for presenting and editing
SQL data from a QSqlCursor in a table.
If you want a to present your data in a form use QDataBrowser, or
for read-only forms, QDataView.
When displaying data, QDataTable only retrieves data for visible
rows. If the driver supports the 'query size' property the
QDataTable will have the correct number of rows and the vertical
scrollbar will accurately reflect the number of rows displayed in
proportion to the number of rows in the dataset. If the driver
does not support the 'query size' property, rows are dynamically
fetched from the database on an as-needed basis with the scrollbar
becoming more accurate as the user scrolls down through the
records. This allows extremely large queries to be displayed as
quickly as possible, with minimum memory usage.
QDataTable inherits QTable's API and extends it with functions to
sort and filter the data and sort columns. See setSqlCursor(),
setFilter(), setSort(), setSorting(), sortColumn() and refresh().
When displaying editable cursors, cell editing will be enabled.
(For more information on editable cursors, see QSqlCursor).
QDataTable can be used to modify existing data and to add new
records. When a user makes changes to a field in the table, the
cursor's edit buffer is used. The table will not send changes in
the edit buffer to the database until the user moves to a
different record in the grid or presses Enter. Cell editing is
initiated by pressing F2 (or right clicking and then clicking the
appropriate popup menu item) and canceled by pressing Esc. If
there is a problem updating or adding data, errors are handled
automatically (see handleError() to change this behavior). Note
that if autoEdit() is FALSE navigating to another record will
cancel the insert or update.
The user can be asked to confirm all edits with setConfirmEdits().
For more precise control use setConfirmInsert(),
setConfirmUpdate(), setConfirmDelete() and setConfirmCancels().
Use setAutoEdit() to control the behaviour of the table when the
user edits a record and then navigates. (Note that setAutoDelete()
is unrelated; it is used to set whether the QSqlCursor is deleted
when the table is deleted.)
Since the data table can perform edits, it must be able to
uniquely identify every record so that edits are correctly
applied. Because of this the underlying cursor must have a valid
primary index to ensure that a unique record is inserted, updated
or deleted within the database otherwise the database may be
changed to an inconsistent state.
QDataTable creates editors using the default QSqlEditorFactory.
Different editor factories can be used by calling
installEditorFactory(). A property map is used to map between the
cell's value and the editor. You can use your own property map
with installPropertyMap().
The contents of a cell is available as a QString with text() or as
a QVariant with value(). The current record is returned by
currentRecord(). Use the find() function to search for a string in
the table.
Editing actions can be applied programatically. For example, the
insertCurrent() function reads the fields from the current record
into the cursor and performs the insert. The updateCurrent() and
deleteCurrent() functions perform similarly to update and delete
the current record respectively.
Columns in the table can be created automatically based on the
cursor (see setSqlCursor()). Columns can be manipulated manually
using addColumn(), removeColumn() and setColumn().
The table automatically copies many of the properties of the
cursor to format the display of data within cells (alignment,
visibility, etc.). The cursor can be changed with setSqlCursor().
The filter (see setFilter()) and sort defined within the table are
used instead of the filter and sort set on the cursor. For sorting
options see setSort(), sortColumn(), sortAscending() and
sortDescending().
The text used to represent NULL, TRUE and FALSE values can be
changed with setNullText(), setTrueText() and setFalseText()
respectively. You can change the appearance of cells by
reimplementing paintField().
Whenever a new row is selected in the table the currentChanged()
signal is emitted. The primeInsert() signal is emitted when an
insert is initiated. The primeUpdate() and primeDelete() signals
are emitted when update and deletion are initiated respectively.
Just before the database is updated a signal is emitted;
beforeInsert(), beforeUpdate() or beforeDelete() as appropriate.
See also Database Classes.
Member Type Documentation
QDataTable::Refresh
This enum describes the refresh options.
- QDataTable::RefreshData - refresh the data, i.e. read it from the database
- QDataTable::RefreshColumns - refresh the list of fields, e.g. the column headings
- QDataTable::RefreshAll - refresh both the data and the list of fields
Member Function Documentation
QDataTable::QDataTable ( QWidget * parent = 0, const char * name = 0 )
Constructs a data table which is a child of parent, called
name name.
QDataTable::QDataTable ( QSqlCursor * cursor, bool autoPopulate = FALSE, QWidget * parent = 0, const char * name = 0 )
Constructs a data table which is a child of parent, called name
name using the cursor cursor.
If autoPopulate is TRUE (the default is FALSE), columns are
automatically created based upon the fields in the cursor
record. Note that autoPopulate only governs the creation of
columns; to load the cursor's data into the table use refresh().
If the cursor is read-only, the table also becomes read-only.
In addition, the table adopts the cursor's driver's definition for
representing NULL values as strings.
QDataTable::~QDataTable ()
Destroys the object and frees any allocated resources.
void QDataTable::addColumn ( const QString & fieldName, const QString & label = QString::null, int width = -1, const QIconSet & iconset = QIconSet ( ) ) [virtual]
Adds the next column to be displayed using the field fieldName,
column label label, width width and iconset iconset.
If label is specified, it is used as the column's header label,
otherwise the field's display label is used when setSqlCursor() is
called. The iconset is used to set the icon used by the column
header; by default there is no icon.
See also setSqlCursor() and refresh().
Examples: sql/overview/subclass1/main.cpp, sql/overview/subclass3/main.cpp, sql/overview/table2/main.cpp, and sql/sqltable/main.cpp.
void QDataTable::adjustColumn ( int col ) [virtual slot]
Resizes column col so that the column width is wide enough to
display the widest item the column contains (including the column
label). If the table's QSqlCursor is not currently active, the
cursor will be refreshed before the column width is calculated. Be
aware that this function may be slow on tables that contain large
result sets.
Reimplemented from QTable.
bool QDataTable::autoDelete () const
Returns TRUE if the table will automatically delete the cursor
specified by setSqlCursor(); otherwise returns FALSE.
bool QDataTable::autoEdit () const
Returns TRUE if the data table automatically applies edits; otherwise returns FALSE.
See the "autoEdit" property for details.
void QDataTable::beforeDelete ( QSqlRecord * buf ) [signal]
This signal is emitted just before the currently selected record
is deleted from the database. The buf parameter points to the
edit buffer being deleted. Connect to this signal to, for example,
copy some of the fields for later use.
void QDataTable::beforeInsert ( QSqlRecord * buf ) [signal]
This signal is emitted just before the cursor's edit buffer is
inserted into the database. The buf parameter points to the
edit buffer being inserted. Connect to this signal to, for
example, populate a key field with a unique sequence number.
void QDataTable::beforeUpdate ( QSqlRecord * buf ) [signal]
This signal is emitted just before the cursor's edit buffer is
updated in the database. The buf parameter points to the edit
buffer being updated. Connect to this signal when you want to
transform the user's data behind-the-scenes.
bool QDataTable::beginInsert () [virtual protected]
Protected virtual function called when editing is about to begin
on a new record. If the table is read-only, or if there's no
cursor or the cursor does not allow inserts, nothing happens.
Editing takes place using the cursor's edit buffer(see
QSqlCursor::editBuffer()).
When editing begins, a new row is created in the table marked with
an asterisk '*' in the row's vertical header column, i.e. at the
left of the row.
QWidget * QDataTable::beginUpdate ( int row, int col, bool replace ) [virtual protected]
Protected virtual function called when editing is about to begin
on an existing row. If the table is read-only, or if there's no
cursor, nothing happens.
Editing takes place using the cursor's edit buffer (see
QSqlCursor::editBuffer()).
row and col refer to the row and column in the QDataTable.
(replace is provided for reimplementors and reflects the API of
QTable::beginEdit().)
QSql::Confirm QDataTable::confirmCancel ( QSql::Op m ) [virtual protected]
Protected virtual function which returns a confirmation for
cancelling an edit mode of m. Derived classes can reimplement
this function to provide their own cancel dialog. The default
implementation uses a message box which prompts the user to
confirm the cancel.
bool QDataTable::confirmCancels () const
Returns TRUE if the data table confirms cancel operations; otherwise returns FALSE.
See the "confirmCancels" property for details.
bool QDataTable::confirmDelete () const
Returns TRUE if the data table confirms delete operations; otherwise returns FALSE.
See the "confirmDelete" property for details.
QSql::Confirm QDataTable::confirmEdit ( QSql::Op m ) [virtual protected]
Protected virtual function which returns a confirmation for an
edit of mode m. Derived classes can reimplement this function
to provide their own confirmation dialog. The default
implementation uses a message box which prompts the user to
confirm the edit action.
bool QDataTable::confirmEdits () const
Returns TRUE if the data table confirms edit operations; otherwise returns FALSE.
See the "confirmEdits" property for details.
bool QDataTable::confirmInsert () const
Returns TRUE if the data table confirms insert operations; otherwise returns FALSE.
See the "confirmInsert" property for details.
bool QDataTable::confirmUpdate () const
Returns TRUE if the data table confirms update operations; otherwise returns FALSE.
See the "confirmUpdate" property for details.
void QDataTable::currentChanged ( QSqlRecord * record ) [signal]
This signal is emitted whenever a new row is selected in the
table. The record parameter points to the contents of the newly
selected record.
QSqlRecord * QDataTable::currentRecord () const
Returns the currently selected record, or 0 if there is no current
selection. The table owns the pointer, so do not delete it or
otherwise modify it or the cursor it points to.
void QDataTable::cursorChanged ( QSql::Op mode ) [signal]
This signal is emitted whenever the cursor record was changed due
to an edit. The mode parameter is the type of edit that just
took place.
DateFormat QDataTable::dateFormat () const
Returns the format used for displaying date/time values.
See the "dateFormat" property for details.
bool QDataTable::deleteCurrent () [virtual protected]
For an editable table, issues a delete on the current cursor's
primary index using the values of the currently selected row. If
there is no current cursor or there is no current selection,
nothing happens. If confirmEdits() or confirmDelete() is TRUE,
confirmEdit() is called to confirm the delete. Returns TRUE if the
delete succeeded; otherwise FALSE.
The underlying cursor must have a valid primary index to ensure
that a unique record is deleted within the database otherwise the
database may be changed to an inconsistent state.
QString QDataTable::falseText () const
Returns the text used to represent false values.
See the "falseText" property for details.
int QDataTable::fieldAlignment ( const QSqlField * field ) [virtual protected]
Returns the alignment for field.
QString QDataTable::filter () const
Returns the data filter for the data table.
See the "filter" property for details.
void QDataTable::find ( const QString & str, bool caseSensitive, bool backwards ) [virtual slot]
Searches the current cursor for a cell containing the string str starting at the current cell and working forwards (or
backwards if backwards is TRUE). If the string is found, the
cell containing the string is set as the current cell. If caseSensitive is FALSE the case of str will be ignored.
The search will wrap, i.e. if the first (or if backwards is TRUE,
last) cell is reached without finding str the search will
continue until it reaches the starting cell. If str is not
found the search will fail and the current cell will remain
unchanged.
void QDataTable::handleError ( const QSqlError & e ) [virtual protected]
Protected virtual function which is called when an error e has
occurred on the current cursor(). The default implementation
displays a warning message to the user with information about the
error.
int QDataTable::indexOf ( uint i ) const [protected]
Returns the index of the field within the current SQL query that
is displayed in column i.
bool QDataTable::insertCurrent () [virtual protected]
For an editable table, issues an insert on the current cursor
using the values in the cursor's edit buffer. If there is no
current cursor or there is no current "insert" row, nothing
happens. If confirmEdits() or confirmInsert() is TRUE,
confirmEdit() is called to confirm the insert. Returns TRUE if the
insert succeeded; otherwise returns FALSE.
The underlying cursor must have a valid primary index to ensure
that a unique record is inserted within the database otherwise the
database may be changed to an inconsistent state.
void QDataTable::installEditorFactory ( QSqlEditorFactory * f )
Installs a new SQL editor factory f. This enables the user to
create and instantiate their own editors for use in cell editing.
Note that QDataTable takes ownership of this pointer, and will
delete it when it is no longer needed or when
installEditorFactory() is called again.
See also QSqlEditorFactory.
void QDataTable::installPropertyMap ( QSqlPropertyMap * m )
Installs a new property map m. This enables the user to create
and instantiate their own property maps for use in cell editing.
Note that QDataTable takes ownership of this pointer, and will
delete it when it is no longer needed or when installPropertMap()
is called again.
See also QSqlPropertyMap.
QString QDataTable::nullText () const
Returns the text used to represent NULL values.
See the "nullText" property for details.
int QDataTable::numCols () const [virtual]
Returns the number of columns in the table.
See the "numCols" property for details.
Reimplemented from QTable.
int QDataTable::numRows () const [virtual]
Returns the number of rows in the table.
See the "numRows" property for details.
Reimplemented from QTable.
void QDataTable::paintField ( QPainter * p, const QSqlField * field, const QRect & cr, bool selected ) [virtual protected]
Paints the field on the painter p. The painter has already
been translated to the appropriate cell's origin where the field is to be rendered. cr describes the cell coordinates in
the content coordinate system. The selected parameter is
ignored.
If you want to draw custom field content you must reimplement
paintField() to do the custom drawing. The default implementation
renders the field value as text. If the field is NULL,
nullText() is displayed in the cell. If the field is Boolean,
trueText() or falseText() is displayed as appropriate.
Example: sql/overview/table4/main.cpp.
void QDataTable::primeDelete ( QSqlRecord * buf ) [signal]
This signal is emitted after the cursor is primed for delete by
the table, when a delete action is beginning on the table. The buf parameter points to the edit buffer being deleted. Connect to
this signal in order to, for example, record auditing information
on deletions.
void QDataTable::primeInsert ( QSqlRecord * buf ) [signal]
This signal is emitted after the cursor is primed for insert by
the table, when an insert action is beginning on the table. The buf parameter points to the edit buffer being inserted. Connect to
this signal in order to, for example, prime the record buffer with
default data values.
void QDataTable::primeUpdate ( QSqlRecord * buf ) [signal]
This signal is emitted after the cursor is primed for update by
the table, when an update action is beginning on the table. The buf parameter points to the edit buffer being updated. Connect to
this signal in order to, for example, provide some visual feedback
that the user is in 'edit mode'.
void QDataTable::refresh () [virtual slot]
Refreshes the table. The cursor is refreshed using the current
filter, the current sort, and the currently defined columns.
Equivalent to calling refresh( QDataTable::RefreshData ).
Examples: sql/overview/subclass1/main.cpp, sql/overview/table1/main.cpp, sql/overview/table2/main.cpp, and sql/sqltable/main.cpp.
void QDataTable::refresh ( Refresh mode )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Refreshes the table. If there is no currently defined cursor (see
setSqlCursor()), nothing happens. The mode parameter determines
which type of refresh will take place.
See also Refresh, setSqlCursor(), and addColumn().
void QDataTable::removeColumn ( uint col ) [virtual]
Removes column col from the list of columns to be displayed. If
col does not exist, nothing happens.
See also QSqlField.
void QDataTable::reset () [protected]
Resets the table so that it displays no data.
See also setSqlCursor().
void QDataTable::setAutoDelete ( bool enable ) [virtual]
Sets the cursor auto-delete flag to enable. If enable is
TRUE, the table will automatically delete the cursor specified by
setSqlCursor(). If enable is FALSE (the default), the cursor
will not be deleted.
void QDataTable::setAutoEdit ( bool autoEdit ) [virtual]
Sets whether the data table automatically applies edits to autoEdit.
See the "autoEdit" property for details.
void QDataTable::setColumn ( uint col, const QString & fieldName, const QString & label = QString::null, int width = -1, const QIconSet & iconset = QIconSet ( ) ) [virtual]
Sets the col column to display using the field fieldName,
column label label, width width and iconset iconset.
If label is specified, it is used as the column's header label,
otherwise the field's display label is used when setSqlCursor() is
called. The iconset is used to set the icon used by the column
header; by default there is no icon.
See also setSqlCursor() and refresh().
void QDataTable::setColumnWidth ( int col, int w ) [virtual slot]
Sets the column col to the width w. Note that unlike QTable
the QDataTable is not immediately redrawn, you must call refresh()
yourself.
See also refresh().
Reimplemented from QTable.
void QDataTable::setConfirmCancels ( bool confirm ) [virtual]
Sets whether the data table confirms cancel operations to confirm.
See the "confirmCancels" property for details.
void QDataTable::setConfirmDelete ( bool confirm ) [virtual]
Sets whether the data table confirms delete operations to confirm.
See the "confirmDelete" property for details.
void QDataTable::setConfirmEdits ( bool confirm ) [virtual]
Sets whether the data table confirms edit operations to confirm.
See the "confirmEdits" property for details.
void QDataTable::setConfirmInsert ( bool confirm ) [virtual]
Sets whether the data table confirms insert operations to confirm.
See the "confirmInsert" property for details.
void QDataTable::setConfirmUpdate ( bool confirm ) [virtual]
Sets whether the data table confirms update operations to confirm.
See the "confirmUpdate" property for details.
void QDataTable::setDateFormat ( const DateFormat f ) [virtual]
Sets the format used for displaying date/time values to f.
See the "dateFormat" property for details.
void QDataTable::setFalseText ( const QString & falseText ) [virtual]
Sets the text used to represent false values to falseText.
See the "falseText" property for details.
void QDataTable::setFilter ( const QString & filter ) [virtual]
Sets the data filter for the data table to filter.
See the "filter" property for details.
void QDataTable::setNullText ( const QString & nullText ) [virtual]
Sets the text used to represent NULL values to nullText.
See the "nullText" property for details.
void QDataTable::setSize ( QSqlCursor * sql ) [protected]
If the cursor's sql driver supports query sizes, the number of
rows in the table is set to the size of the query. Otherwise, the
table dynamically resizes itself as it is scrolled. If sql is
not active, it is made active by issuing a select() on the cursor
using the sql cursor's current filter and current sort.
void QDataTable::setSort ( const QStringList & sort ) [virtual]
Sets the data table's sort to sort.
See the "sort" property for details.
void QDataTable::setSort ( const QSqlIndex & sort ) [virtual]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the sort to be applied to the displayed data to sort. If
there is no current cursor, nothing happens. A QSqlIndex contains
field names and their ordering (ASC or DESC); these are used to
compose the ORDER BY clause.
See also sort.
void QDataTable::setSqlCursor ( QSqlCursor * cursor = 0, bool autoPopulate = FALSE, bool autoDelete = FALSE ) [virtual]
Sets cursor as the data source for the table. To force the
display of the data from cursor, use refresh(). If autoPopulate is TRUE, columns are automatically created based upon
the fields in the cursor record. If autoDelete is TRUE (the
default is FALSE), the table will take ownership of the cursor
and delete it when appropriate. If the cursor is read-only, the
table becomes read-only. The table adopts the cursor's driver's
definition for representing NULL values as strings.
See also refresh(), readOnly, setAutoDelete(), and QSqlDriver::nullText().
void QDataTable::setTrueText ( const QString & trueText ) [virtual]
Sets the text used to represent true values to trueText.
See the "trueText" property for details.
QStringList QDataTable::sort () const
Returns the data table's sort.
See the "sort" property for details.
void QDataTable::sortAscending ( int col ) [virtual slot]
Sorts column col in ascending order.
See also sorting.
void QDataTable::sortColumn ( int col, bool ascending = TRUE, bool wholeRows = FALSE ) [virtual]
Sorts column col in ascending order if ascending is TRUE
(the default); otherwise sorts in descending order.
The wholeRows parameter is ignored; QDataTable always sorts
whole rows by the specified column.
Reimplemented from QTable.
void QDataTable::sortDescending ( int col ) [virtual slot]
Sorts column col in descending order.
See also sorting.
QSqlCursor * QDataTable::sqlCursor () const
Returns the cursor used by the data table.
QString QDataTable::text ( int row, int col ) const [virtual]
Returns the text in cell row, col, or an empty string if the
cell is empty. If the cell's value is NULL then nullText() will be
returned. If the cell does not exist then QString::null is
returned.
Reimplemented from QTable.
QString QDataTable::trueText () const
Returns the text used to represent true values.
See the "trueText" property for details.
bool QDataTable::updateCurrent () [virtual protected]
For an editable table, issues an update using the cursor's edit
buffer. If there is no current cursor or there is no current
selection, nothing happens. If confirmEdits() or confirmUpdate()
is TRUE, confirmEdit() is called to confirm the update. Returns
TRUE if the update succeeded; otherwise returns FALSE.
The underlying cursor must have a valid primary index to ensure
that a unique record is updated within the database otherwise the
database may be changed to an inconsistent state.
QVariant QDataTable::value ( int row, int col ) const
Returns the value in cell row, col, or an invalid value if
the cell does not exist or has no value.
Property Documentation
bool autoEdit
This property holds whether the data table automatically applies edits.
The default value for this property is TRUE. When the user begins
an insert or update in the table there are two possible outcomes
when they navigate to another record:
- the insert or update is is performed -- this occurs if autoEdit is TRUE
- the insert or update is abandoned -- this occurs if autoEdit is FALSE
Set this property's value with setAutoEdit() and get this property's value with autoEdit().
bool confirmCancels
This property holds whether the data table confirms cancel operations.
If the confirmCancel property is TRUE, all cancels must be
confirmed by the user through a message box (this behavior can be
changed by overriding the confirmCancel() function), otherwise all
cancels occur immediately. The default is FALSE.
See also confirmEdits and confirmCancel().
Set this property's value with setConfirmCancels() and get this property's value with confirmCancels().
bool confirmDelete
This property holds whether the data table confirms delete operations.
If the confirmDelete property is TRUE, all deletions must be
confirmed by the user through a message box (this behaviour can be
changed by overriding the confirmEdit() function), otherwise all
delete operations occur immediately.
See also confirmCancels, confirmEdits, confirmUpdate, and confirmInsert.
Set this property's value with setConfirmDelete() and get this property's value with confirmDelete().
bool confirmEdits
This property holds whether the data table confirms edit operations.
If the confirmEdits property is TRUE, the data table confirms all
edit operations (inserts, updates and deletes). Finer control of
edit confirmation can be achieved using confirmCancels, confirmInsert, confirmUpdate and confirmDelete.
See also confirmCancels, confirmInsert, confirmUpdate, and confirmDelete.
Set this property's value with setConfirmEdits() and get this property's value with confirmEdits().
bool confirmInsert
This property holds whether the data table confirms insert operations.
If the confirmInsert property is TRUE, all insertions must be
confirmed by the user through a message box (this behaviour can be
changed by overriding the confirmEdit() function), otherwise all
insert operations occur immediately.
See also confirmCancels, confirmEdits, confirmUpdate, and confirmDelete.
Set this property's value with setConfirmInsert() and get this property's value with confirmInsert().
bool confirmUpdate
This property holds whether the data table confirms update operations.
If the confirmUpdate property is TRUE, all updates must be
confirmed by the user through a message box (this behaviour can be
changed by overriding the confirmEdit() function), otherwise all
update operations occur immediately.
See also confirmCancels, confirmEdits, confirmInsert, and confirmDelete.
Set this property's value with setConfirmUpdate() and get this property's value with confirmUpdate().
This property holds the format used for displaying date/time values.
The dateFormat property is used for displaying date/time values in
the table. The default value is Qt::LocalDate.
Set this property's value with setDateFormat() and get this property's value with dateFormat().
This property holds the text used to represent false values.
The falseText property will be used to represent NULL values in
the table. The default value is "False".
Set this property's value with setFalseText() and get this property's value with falseText().
This property holds the data filter for the data table.
The filter applies to the data shown in the table. To view data
with a new filter, use refresh(). A filter string is an SQL WHERE
clause without the WHERE keyword.
There is no default filter.
See also sort.
Set this property's value with setFilter() and get this property's value with filter().
This property holds the text used to represent NULL values.
The nullText property will be used to represent NULL values in the
table. The default value is provided by the cursor's driver.
Set this property's value with setNullText() and get this property's value with nullText().
int numCols
This property holds the number of columns in the table.
Get this property's value with numCols().
int numRows
This property holds the number of rows in the table.
Get this property's value with numRows().
This property holds the data table's sort.
The table's sort affects the order in which data records are
displayed in the table. To apply a sort, use refresh().
When examining the sort property, a string list is returned with
each item having the form 'fieldname order' (e.g., 'id ASC',
'surname DESC').
There is no default sort.
Note that if you want to iterate over the sort list, you should
iterate over a copy, e.g.
QStringList list = myDataTable.sort();
QStringList::Iterator it = list.begin();
while( it != list.end() ) {
myProcessing( *it );
++it;
}
See also filter and refresh().
Set this property's value with setSort() and get this property's value with sort().
This property holds the text used to represent true values.
The trueText property will be used to represent NULL values in the
table. The default value is "True".
Set this property's value with setTrueText() and get this property's value with trueText().
This file is part of the Qt toolkit.
Copyright © 1995-2003
Trolltech. All Rights Reserved.
