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200 lines
9.7 KiB
200 lines
9.7 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/sql/qsqlpropertymap.cpp:53 -->
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<title>QSqlPropertyMap Class</title>
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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>
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<p>The QSqlPropertyMap class is used to map widgets to SQL fields.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsqlpropertymap-h.html">qsqlpropertymap.h</a>></tt>
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<p><a href="qsqlpropertymap-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QSqlPropertyMap"><b>QSqlPropertyMap</b></a> ()</li>
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<li class=fn>virtual <a href="#~QSqlPropertyMap"><b>~QSqlPropertyMap</b></a> ()</li>
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<li class=fn>QVariant <a href="#property"><b>property</b></a> ( QWidget * widget )</li>
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<li class=fn>virtual void <a href="#setProperty"><b>setProperty</b></a> ( QWidget * widget, const QVariant & value )</li>
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<li class=fn>void <a href="#insert"><b>insert</b></a> ( const QString & classname, const QString & property )</li>
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<li class=fn>void <a href="#remove"><b>remove</b></a> ( const QString & classname )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>QSqlPropertyMap * <a href="#defaultMap"><b>defaultMap</b></a> ()</li>
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<li class=fn>void <a href="#installDefaultMap"><b>installDefaultMap</b></a> ( QSqlPropertyMap * map )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QSqlPropertyMap class is used to map widgets to SQL fields.
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<p>
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<p> The SQL module uses Qt <a href="properties.html">object
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properties</a> to insert and extract values from editor
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widgets.
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<p> This class is used to map editors to SQL fields. This works by
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associating SQL editor class names to the properties used to
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insert and extract values to/from the editor.
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<p> For example, a <a href="qlineedit.html">QLineEdit</a> can be used to edit text strings and
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other data types in QDataTables or QSqlForms. Several properties
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are defined in QLineEdit, but only the <em>text</em> property is used to
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insert and extract text from a QLineEdit. Both <a href="qdatatable.html">QDataTable</a> and
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<a href="qsqlform.html">QSqlForm</a> use the global QSqlPropertyMap for inserting and
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extracting values to and from an editor widget. The global
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property map defines several common widgets and properties that
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are suitable for many applications. You can add and remove widget
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properties to suit your specific needs.
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<p> If you want to use custom editors with your QDataTable or
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QSqlForm, you must install your own QSqlPropertyMap for that table
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or form. Example:
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<p> <pre>
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QSqlPropertyMap *myMap = new QSqlPropertyMap();
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<a href="qsqlform.html">QSqlForm</a> *myForm = new <a href="qsqlform.html">QSqlForm</a>( this );
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MyEditor myEditor( this );
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// Set the QSqlForm's record buffer to the update buffer of
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// a pre-existing QSqlCursor called 'cur'.
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myForm-><a href="qsqlform.html#setRecord">setRecord</a>( cur->primeUpdate() );
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// Install the customized map
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myMap-><a href="#insert">insert</a>( "MyEditor", "content" );
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myForm-><a href="qsqlform.html#installPropertyMap">installPropertyMap</a>( myMap ); // myForm now owns myMap
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...
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// Insert a field into the form that uses a myEditor to edit the
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// field 'somefield'
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myForm-><a href="qsqlform.html#insert">insert</a>( &myEditor, "somefield" );
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// Update myEditor with the value from the mapped database field
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myForm-><a href="qsqlform.html#readFields">readFields</a>();
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...
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// Let the user edit the form
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...
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// Update the database fields with the values in the form
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myForm-><a href="qsqlform.html#writeFields">writeFields</a>();
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...
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</pre>
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<p> You can also replace the global QSqlPropertyMap that is used by
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default. (Bear in mind that QSqlPropertyMap takes ownership of the
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new default map.)
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<p> <pre>
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QSqlPropertyMap *myMap = new QSqlPropertyMap;
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myMap-><a href="#insert">insert</a>( "MyEditor", "content" );
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QSqlPropertyMap::<a href="#installDefaultMap">installDefaultMap</a>( myMap );
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...
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</pre>
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<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>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QSqlPropertyMap"></a>QSqlPropertyMap::QSqlPropertyMap ()
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</h3>
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<p> Constructs a QSqlPropertyMap.
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<p> The default property mappings used by Qt widgets are:
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<center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#a2c511"> <th valign="top">Widgets <th valign="top">Property
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="qcheckbox.html">QCheckBox</a>,
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<a href="qradiobutton.html">QRadioButton</a>
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<td valign="top">checked
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qcombobox.html">QComboBox</a>,
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<a href="qlistbox.html">QListBox</a>
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<td valign="top">currentItem
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="qdateedit.html">QDateEdit</a>
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<td valign="top">date
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qdatetimeedit.html">QDateTimeEdit</a>
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<td valign="top">dateTime
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="qtextbrowser.html">QTextBrowser</a>
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<td valign="top">source
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qbutton.html">QButton</a>,
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<a href="qdial.html">QDial</a>,
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<a href="qlabel.html">QLabel</a>,
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<a href="qlineedit.html">QLineEdit</a>,
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<a href="qmultilineedit.html">QMultiLineEdit</a>,
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<a href="qpushbutton.html">QPushButton</a>,
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<a href="qtextedit.html">QTextEdit</a>,
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<td valign="top">text
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<tr bgcolor="#f0f0f0"> <td valign="top"><a href="qtimeedit.html">QTimeEdit</a>
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<td valign="top">time
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qlcdnumber.html">QLCDNumber</a>,
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<a href="qscrollbar.html">QScrollBar</a>
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<a href="qslider.html">QSlider</a>,
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<a href="qspinbox.html">QSpinBox</a>
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<td valign="top">value
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</table></center>
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<h3 class=fn><a name="~QSqlPropertyMap"></a>QSqlPropertyMap::~QSqlPropertyMap ()<tt> [virtual]</tt>
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</h3>
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Destroys the QSqlPropertyMap.
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<p> Note that if the QSqlPropertyMap is installed with
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installPropertyMap() the object it was installed into, e.g. the
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<a href="qsqlform.html">QSqlForm</a>, takes ownership and will delete the QSqlPropertyMap when
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necessary.
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<h3 class=fn><a href="qsqlpropertymap.html">QSqlPropertyMap</a> * <a name="defaultMap"></a>QSqlPropertyMap::defaultMap ()<tt> [static]</tt>
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</h3>
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Returns the application global QSqlPropertyMap.
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<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 )
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</h3>
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Insert a new classname/property pair, which is used for custom SQL
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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>.
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<p>Example: <a href="sql.html#x2239">sql/overview/custom1/main.cpp</a>.
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<h3 class=fn>void <a name="installDefaultMap"></a>QSqlPropertyMap::installDefaultMap ( <a href="qsqlpropertymap.html">QSqlPropertyMap</a> * map )<tt> [static]</tt>
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</h3>
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Replaces the global default property map with <em>map</em>. All
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<a href="qdatatable.html">QDataTable</a> and <a href="qsqlform.html">QSqlForm</a> instantiations will use this new map for
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inserting and extracting values to and from editors.
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<em>QSqlPropertyMap takes ownership of \a map, and destroys it when it is no longer needed.</em>
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<h3 class=fn><a href="qvariant.html">QVariant</a> <a name="property"></a>QSqlPropertyMap::property ( <a href="qwidget.html">QWidget</a> * widget )
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</h3>
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Returns the mapped property of <em>widget</em> as a <a href="qvariant.html">QVariant</a>.
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<h3 class=fn>void <a name="remove"></a>QSqlPropertyMap::remove ( const <a href="qstring.html">QString</a> & classname )
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</h3>
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Removes <em>classname</em> from the map.
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<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>
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</h3>
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Sets the property of <em>widget</em> to <em>value</em>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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