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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSqlPropertyMap Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
<p>The QSqlPropertyMap class is used to map widgets to SQL fields.
<a href="#details">More...</a>
<p><tt>#include <<a href="qsqlpropertymap-h.html">qsqlpropertymap.h</a>></tt>
<p><a href="qsqlpropertymap-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QSqlPropertyMap"><b>QSqlPropertyMap</b></a> ()</li>
<li class=fn>virtual <a href="#~QSqlPropertyMap"><b>~QSqlPropertyMap</b></a> ()</li>
<li class=fn>QVariant <a href="#property"><b>property</b></a> ( QWidget * widget )</li>
<li class=fn>virtual void <a href="#setProperty"><b>setProperty</b></a> ( QWidget * widget, const QVariant & value )</li>
<li class=fn>void <a href="#insert"><b>insert</b></a> ( const QString & classname, const QString & property )</li>
<li class=fn>void <a href="#remove"><b>remove</b></a> ( const QString & classname )</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>QSqlPropertyMap * <a href="#defaultMap"><b>defaultMap</b></a> ()</li>
<li class=fn>void <a href="#installDefaultMap"><b>installDefaultMap</b></a> ( QSqlPropertyMap * map )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QSqlPropertyMap class is used to map widgets to SQL fields.
<p>
<p> The SQL module uses Qt <a href="properties.html">object
properties</a> to insert and extract values from editor
widgets.
<p> 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.
<p> For example, a <a href="qlineedit.html">QLineEdit</a> can be used to edit text strings and
other data types in QDataTables or QSqlForms. Several properties
are defined in QLineEdit, but only the <em>text</em> property is used to
insert and extract text from a QLineEdit. Both <a href="qdatatable.html">QDataTable</a> and
<a href="qsqlform.html">QSqlForm</a> 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.
<p> If you want to use custom editors with your QDataTable or
QSqlForm, you must install your own QSqlPropertyMap for that table
or form. Example:
<p> <pre>
QSqlPropertyMap *myMap = new QSqlPropertyMap();
<a href="qsqlform.html">QSqlForm</a> *myForm = new <a href="qsqlform.html">QSqlForm</a>( this );
MyEditor myEditor( this );
// Set the QSqlForm's record buffer to the update buffer of
// a pre-existing QSqlCursor called 'cur'.
myForm-><a href="qsqlform.html#setRecord">setRecord</a>( cur->primeUpdate() );
// Install the customized map
myMap-><a href="#insert">insert</a>( "MyEditor", "content" );
myForm-><a href="qsqlform.html#installPropertyMap">installPropertyMap</a>( myMap ); // myForm now owns myMap
...
// Insert a field into the form that uses a myEditor to edit the
// field 'somefield'
myForm-><a href="qsqlform.html#insert">insert</a>( &myEditor, "somefield" );
// Update myEditor with the value from the mapped database field
myForm-><a href="qsqlform.html#readFields">readFields</a>();
...
// Let the user edit the form
...
// Update the database fields with the values in the form
myForm-><a href="qsqlform.html#writeFields">writeFields</a>();
...
</pre>
<p> You can also replace the global QSqlPropertyMap that is used by
default. (Bear in mind that QSqlPropertyMap takes ownership of the
new default map.)
<p> <pre>
QSqlPropertyMap *myMap = new QSqlPropertyMap;
myMap-><a href="#insert">insert</a>( "MyEditor", "content" );
QSqlPropertyMap::<a href="#installDefaultMap">installDefaultMap</a>( myMap );
...
</pre>
<p> <p>See also <a href="qdatatable.html">QDataTable</a>, <a href="qsqlform.html">QSqlForm</a>, <a href="qsqleditorfactory.html">QSqlEditorFactory</a>, and <a href="database.html">Database Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QSqlPropertyMap"></a>QSqlPropertyMap::QSqlPropertyMap ()
</h3>
<p> Constructs a QSqlPropertyMap.
<p> The default property mappings used by Qt widgets are:
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<td valign="top">dateTime
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<td valign="top">source
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<a href="qdial.html">QDial</a>,
<a href="qlabel.html">QLabel</a>,
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<h3 class=fn><a name="~QSqlPropertyMap"></a>QSqlPropertyMap::~QSqlPropertyMap ()<tt> [virtual]</tt>
</h3>
Destroys the QSqlPropertyMap.
<p> Note that if the QSqlPropertyMap is installed with
installPropertyMap() the object it was installed into, e.g. the
<a href="qsqlform.html">QSqlForm</a>, takes ownership and will delete the QSqlPropertyMap when
necessary.
<h3 class=fn><a href="qsqlpropertymap.html">QSqlPropertyMap</a> * <a name="defaultMap"></a>QSqlPropertyMap::defaultMap ()<tt> [static]</tt>
</h3>
Returns the application global QSqlPropertyMap.
<h3 class=fn>void <a name="insert"></a>QSqlPropertyMap::insert ( const <a href="qstring.html">QString</a> & classname, const <a href="qstring.html">QString</a> & property )
</h3>
Insert a new classname/property pair, which is used for custom SQL
field editors. There <em>must</em> be a <tt>Q_PROPERTY</tt> clause in the <em>classname</em> class declaration for the <em>property</em>.
<p>Example: <a href="sql.html#x2239">sql/overview/custom1/main.cpp</a>.
<h3 class=fn>void <a name="installDefaultMap"></a>QSqlPropertyMap::installDefaultMap ( <a href="qsqlpropertymap.html">QSqlPropertyMap</a> * map )<tt> [static]</tt>
</h3>
Replaces the global default property map with <em>map</em>. All
<a href="qdatatable.html">QDataTable</a> and <a href="qsqlform.html">QSqlForm</a> instantiations will use this new map for
inserting and extracting values to and from editors.
<em>QSqlPropertyMap takes ownership of \a map, and destroys it when it is no longer needed.</em>
<h3 class=fn><a href="qvariant.html">QVariant</a> <a name="property"></a>QSqlPropertyMap::property ( <a href="qwidget.html">QWidget</a> * widget )
</h3>
Returns the mapped property of <em>widget</em> as a <a href="qvariant.html">QVariant</a>.
<h3 class=fn>void <a name="remove"></a>QSqlPropertyMap::remove ( const <a href="qstring.html">QString</a> & classname )
</h3>
Removes <em>classname</em> from the map.
<h3 class=fn>void <a name="setProperty"></a>QSqlPropertyMap::setProperty ( <a href="qwidget.html">QWidget</a> * widget, const <a href="qvariant.html">QVariant</a> & value )<tt> [virtual]</tt>
</h3>
Sets the property of <em>widget</em> to <em>value</em>.
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