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238 lines
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<title>QSqlForm 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>QSqlForm Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
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<p>The QSqlForm class creates and manages data entry forms
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tied to SQL databases.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsqlform-h.html">qsqlform.h</a>></tt>
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<p>Inherits <a href="qobject.html">QObject</a>.
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<p><a href="qsqlform-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="#QSqlForm"><b>QSqlForm</b></a> ( QObject * parent = 0, const char * name = 0 )</li>
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<li class=fn><a href="#~QSqlForm"><b>~QSqlForm</b></a> ()</li>
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<li class=fn>virtual void <a href="#insert"><b>insert</b></a> ( QWidget * widget, const QString & field )</li>
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<li class=fn>virtual void <a href="#remove-2"><b>remove</b></a> ( const QString & field )</li>
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<li class=fn>uint <a href="#count"><b>count</b></a> () const</li>
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<li class=fn>QWidget * <a href="#widget"><b>widget</b></a> ( uint i ) const</li>
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<li class=fn>QSqlField * <a href="#widgetToField"><b>widgetToField</b></a> ( QWidget * widget ) const</li>
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<li class=fn>QWidget * <a href="#fieldToWidget"><b>fieldToWidget</b></a> ( QSqlField * field ) const</li>
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<li class=fn>void <a href="#installPropertyMap"><b>installPropertyMap</b></a> ( QSqlPropertyMap * pmap )</li>
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<li class=fn>virtual void <a href="#setRecord"><b>setRecord</b></a> ( QSqlRecord * buf )</li>
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</ul>
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<h2>Public Slots</h2>
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<ul>
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<li class=fn>virtual void <a href="#readField"><b>readField</b></a> ( QWidget * widget )</li>
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<li class=fn>virtual void <a href="#writeField"><b>writeField</b></a> ( QWidget * widget )</li>
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<li class=fn>virtual void <a href="#readFields"><b>readFields</b></a> ()</li>
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<li class=fn>virtual void <a href="#writeFields"><b>writeFields</b></a> ()</li>
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<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
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<li class=fn>virtual void <a href="#clearValues"><b>clearValues</b></a> ( bool nullify = FALSE )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual void <a href="#insert-2"><b>insert</b></a> ( QWidget * widget, QSqlField * field )</li>
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<li class=fn>virtual void <a href="#remove"><b>remove</b></a> ( QWidget * widget )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QSqlForm class creates and manages data entry forms
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tied to SQL databases.
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<p>
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<p> Typical use of a QSqlForm consists of the following steps:
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<ul>
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<li> Create the widgets you want to appear in the form.
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<li> Create a cursor and navigate to the record to be edited.
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<li> Create the QSqlForm.
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<li> Set the form's record buffer to the cursor's update buffer.
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<li> Insert each widget and the field it is to edit into the form.
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<li> Use <a href="#readFields">readFields</a>() to update the editor widgets with values from
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the database's fields.
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<li> Display the form and let the user edit values etc.
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<li> Use <a href="#writeFields">writeFields</a>() to update the database's field values with
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the values in the editor widgets.
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</ul>
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<p> Note that a QSqlForm does not access the database directly, but
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most often via QSqlFields which are part of a <a href="qsqlcursor.html">QSqlCursor</a>. A
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<a href="qsqlcursor.html#insert">QSqlCursor::insert</a>(), <a href="qsqlcursor.html#update">QSqlCursor::update</a>() or <a href="qsqlcursor.html#del">QSqlCursor::del</a>()
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call is needed to actually write values to the database.
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<p> Some sample code to initialize a form successfully:
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<p> <pre>
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<a href="qlineedit.html">QLineEdit</a> myEditor( this );
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QSqlForm myForm( this );
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<a href="qsqlcursor.html">QSqlCursor</a> myCursor( "mytable" );
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// Execute a query to make the cursor valid
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myCursor.<a href="qsqlcursor.html#select">select</a>();
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// Move the cursor to a valid record (the first record)
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myCursor.<a href="qsqlquery.html#next">next</a>();
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// Set the form's record pointer to the cursor's edit buffer (which
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// contains the current record's values)
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myForm.<a href="#setRecord">setRecord</a>( myCursor.<a href="qsqlcursor.html#primeUpdate">primeUpdate</a>() );
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// Insert a field into the form that uses myEditor to edit the
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// field 'somefield' in 'mytable'
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myForm.<a href="#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="#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
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myForm.<a href="#writeFields">writeFields</a>(); // Update the cursor's edit buffer from the form
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myCursor.<a href="qsqlcursor.html#update">update</a>(); // Update the database from the cursor's buffer
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</pre>
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<p> If you want to use custom editors for displaying and editing data
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fields, you must install a custom <a href="qsqlpropertymap.html">QSqlPropertyMap</a>. The form
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uses this object to get or set the value of a widget.
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<p> Note that <a href="designer-manual.html">Qt Designer</a> provides
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a visual means of creating data-aware forms.
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<p> <p>See also <a href="#installPropertyMap">installPropertyMap</a>(), <a href="qsqlpropertymap.html">QSqlPropertyMap</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="QSqlForm"></a>QSqlForm::QSqlForm ( <a href="qobject.html">QObject</a> * parent = 0, const char * name = 0 )
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</h3>
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Constructs a QSqlForm with parent <em>parent</em> and called <em>name</em>.
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<h3 class=fn><a name="~QSqlForm"></a>QSqlForm::~QSqlForm ()
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</h3>
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Destroys the object and frees any allocated resources.
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<h3 class=fn>void <a name="clear"></a>QSqlForm::clear ()<tt> [virtual slot]</tt>
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</h3>
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Removes every widget, and the fields they're mapped to, from the form.
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<h3 class=fn>void <a name="clearValues"></a>QSqlForm::clearValues ( bool nullify = FALSE )<tt> [virtual slot]</tt>
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</h3>
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Clears the values in all the widgets, and the fields they are
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mapped to, in the form. If <em>nullify</em> is TRUE (the default is
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FALSE), each field is also set to NULL.
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<h3 class=fn>uint <a name="count"></a>QSqlForm::count () const
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</h3>
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Returns the number of widgets in the form.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="fieldToWidget"></a>QSqlForm::fieldToWidget ( <a href="qsqlfield.html">QSqlField</a> * field ) const
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</h3>
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Returns the widget that field <em>field</em> is mapped to.
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<h3 class=fn>void <a name="insert"></a>QSqlForm::insert ( <a href="qwidget.html">QWidget</a> * widget, const <a href="qstring.html">QString</a> & field )<tt> [virtual]</tt>
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</h3>
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Inserts a <em>widget</em>, and the name of the <em>field</em> it is to be
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mapped to, into the form. To actually associate inserted widgets
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with an edit buffer, use <a href="#setRecord">setRecord</a>().
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<p> <p>See also <a href="#setRecord">setRecord</a>().
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<p>Examples: <a href="sql.html#x2225">sql/overview/form1/main.cpp</a> and <a href="sql.html#x2231">sql/overview/form2/main.cpp</a>.
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<h3 class=fn>void <a name="insert-2"></a>QSqlForm::insert ( <a href="qwidget.html">QWidget</a> * widget, <a href="qsqlfield.html">QSqlField</a> * field )<tt> [virtual protected]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Inserts a <em>widget</em>, and the <em>field</em> it is to be mapped to, into
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the form.
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<h3 class=fn>void <a name="installPropertyMap"></a>QSqlForm::installPropertyMap ( <a href="qsqlpropertymap.html">QSqlPropertyMap</a> * pmap )
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</h3>
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Installs a custom <a href="qsqlpropertymap.html">QSqlPropertyMap</a>. This is useful if you plan to
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create your own custom editor widgets.
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<p> QSqlForm takes ownership of <em>pmap</em>, so <em>pmap</em> is deleted when
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QSqlForm goes out of scope.
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<p> <p>See also <a href="qdatatable.html#installEditorFactory">QDataTable::installEditorFactory</a>().
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<p>Example: <a href="sql.html#x2237">sql/overview/custom1/main.cpp</a>.
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<h3 class=fn>void <a name="readField"></a>QSqlForm::readField ( <a href="qwidget.html">QWidget</a> * widget )<tt> [virtual slot]</tt>
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</h3>
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Updates the widget <em>widget</em> with the value from the SQL field it
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is mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>.
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<h3 class=fn>void <a name="readFields"></a>QSqlForm::readFields ()<tt> [virtual slot]</tt>
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</h3>
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Updates the widgets in the form with current values from the SQL
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fields they are mapped to.
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<p>Examples: <a href="sql.html#x2226">sql/overview/form1/main.cpp</a> and <a href="sql.html#x2232">sql/overview/form2/main.cpp</a>.
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<h3 class=fn>void <a name="remove"></a>QSqlForm::remove ( <a href="qwidget.html">QWidget</a> * widget )<tt> [virtual protected]</tt>
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</h3>
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Removes a <em>widget</em>, and hence the field it's mapped to, from the
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form.
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<h3 class=fn>void <a name="remove-2"></a>QSqlForm::remove ( const <a href="qstring.html">QString</a> & field )<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Removes <em>field</em> from the form.
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<h3 class=fn>void <a name="setRecord"></a>QSqlForm::setRecord ( <a href="qsqlrecord.html">QSqlRecord</a> * buf )<tt> [virtual]</tt>
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</h3>
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Sets <em>buf</em> as the record buffer for the form. To force the
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display of the data from <em>buf</em>, use <a href="#readFields">readFields</a>().
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<p> <p>See also <a href="#readFields">readFields</a>() and <a href="#writeFields">writeFields</a>().
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<p>Examples: <a href="sql.html#x2238">sql/overview/custom1/main.cpp</a>, <a href="sql.html#x2227">sql/overview/form1/main.cpp</a>, and <a href="sql.html#x2233">sql/overview/form2/main.cpp</a>.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="widget"></a>QSqlForm::widget ( uint i ) const
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</h3>
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Returns the <em>i</em>-th widget in the form. Useful for traversing
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the widgets in the form.
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<h3 class=fn><a href="qsqlfield.html">QSqlField</a> * <a name="widgetToField"></a>QSqlForm::widgetToField ( <a href="qwidget.html">QWidget</a> * widget ) const
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</h3>
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Returns the SQL field that widget <em>widget</em> is mapped to.
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<h3 class=fn>void <a name="writeField"></a>QSqlForm::writeField ( <a href="qwidget.html">QWidget</a> * widget )<tt> [virtual slot]</tt>
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</h3>
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Updates the SQL field with the value from the <em>widget</em> it is
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mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>.
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<h3 class=fn>void <a name="writeFields"></a>QSqlForm::writeFields ()<tt> [virtual slot]</tt>
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</h3>
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Updates the SQL fields with values from the widgets they are
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mapped to. To actually update the database with the contents of
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the record buffer, use <a href="qsqlcursor.html#insert">QSqlCursor::insert</a>(), <a href="qsqlcursor.html#update">QSqlCursor::update</a>()
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or <a href="qsqlcursor.html#del">QSqlCursor::del</a>() as appropriate.
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<p>Example: <a href="sql.html#x2234">sql/overview/form2/main.cpp</a>.
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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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