QSqlPropertyMap(3qt)QSqlPropertyMap(3qt)NAMEQSqlPropertyMap - Used to map widgets to SQL fields
SYNOPSIS
#include <qsqlpropertymap.h>
Public Members
QSqlPropertyMap ()
virtual ~QSqlPropertyMap ()
QVariant property ( QWidget * widget )
virtual void setProperty ( QWidget * widget, const QVariant & value )
void insert ( const QString & classname, const QString & property )
void remove ( const QString & classname )
Static Public Members
QSqlPropertyMap * defaultMap ()
void installDefaultMap ( QSqlPropertyMap * map )
DESCRIPTION
The QSqlPropertyMap class is used to map widgets to SQL fields.
The SQL module uses Qt object properties to insert and extract values
from editor widgets.
This class is used to map editors to SQL fields. This works by
associating SQL editor class names to the properties used to insert and
extract values to/from the editor.
For example, a QLineEdit can be used to edit text strings and other
data types in QDataTables or QSqlForms. Several properties are defined
in QLineEdit, but only the text property is used to insert and extract
text from a QLineEdit. Both QDataTable and QSqlForm use the global
QSqlPropertyMap for inserting and extracting values to and from an
editor widget. The global property map defines several common widgets
and properties that are suitable for many applications. You can add and
remove widget properties to suit your specific needs.
If you want to use custom editors with your QDataTable or QSqlForm, you
must install your own QSqlPropertyMap for that table or form. Example:
QSqlPropertyMap *myMap = new QSqlPropertyMap();
QSqlForm *myForm = new QSqlForm( this );
MyEditor myEditor( this );
// Set the QSqlForm's record buffer to the update buffer of
// a pre-existing QSqlCursor called 'cur'.
myForm->setRecord( cur->primeUpdate() );
// Install the customized map
myMap->insert( "MyEditor", "content" );
myForm->installPropertyMap( myMap ); // myForm now owns myMap
...
// Insert a field into the form that uses a myEditor to edit the
// field 'somefield'
myForm->insert( &myEditor, "somefield" );
// Update myEditor with the value from the mapped database field
myForm->readFields();
...
// Let the user edit the form
...
// Update the database fields with the values in the form
myForm->writeFields();
...
You can also replace the global QSqlPropertyMap that is used by
default. (Bear in mind that QSqlPropertyMap takes ownership of the new
default map.)
QSqlPropertyMap *myMap = new QSqlPropertyMap;
myMap->insert( "MyEditor", "content" );
QSqlPropertyMap::installDefaultMap( myMap );
...
See also QDataTable, QSqlForm, QSqlEditorFactory, and Database Classes.
MEMBER FUNCTION DOCUMENTATIONQSqlPropertyMap::QSqlPropertyMap ()
Constructs a QSqlPropertyMap.
The default property mappings used by Qt widgets are: <center>.nf
</center>
QSqlPropertyMap::~QSqlPropertyMap () [virtual]
Destroys the QSqlPropertyMap.
Note that if the QSqlPropertyMap is installed with installPropertyMap()
the object it was installed into, e.g. the QSqlForm, takes ownership
and will delete the QSqlPropertyMap when necessary.
QSqlPropertyMap * QSqlPropertyMap::defaultMap () [static]
Returns the application global QSqlPropertyMap.
void QSqlPropertyMap::insert ( const QString & classname, const QString &
property )
Insert a new classname/property pair, which is used for custom SQL
field editors. There must be a Q_PROPERTY clause in the classname class
declaration for the property.
Example: sql/overview/custom1/main.cpp.
void QSqlPropertyMap::installDefaultMap ( QSqlPropertyMap * map ) [static]
Replaces the global default property map with map. All QDataTable and
QSqlForm instantiations will use this new map for inserting and
extracting values to and from editors. QSqlPropertyMap takes ownership
of \a map, and destroys it when it is no longer needed.
QVariant QSqlPropertyMap::property ( QWidget * widget )
Returns the mapped property of widget as a QVariant.
void QSqlPropertyMap::remove ( const QString & classname )
Removes classname from the map.
void QSqlPropertyMap::setProperty ( QWidget * widget, const QVariant & value )
[virtual]
Sets the property of widget to value.
SEE ALSO
http://doc.trolltech.com/qsqlpropertymap.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
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Trolltech AS 2 February 2007 QSqlPropertyMap(3qt)