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<h1 class="title">Q3SqlForm Class Reference</h1>
<!-- $$$Q3SqlForm-brief -->
<p>The Q3SqlForm class creates and manages data entry forms tied to SQL databases. <a href="#details">More...</a></p>
<!-- @@@Q3SqlForm -->
<pre class="cpp"> <span class="preprocessor">#include <Q3SqlForm></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html#qsqlform">Porting to Qt 4</a> for more information.</p>
<p><b>Inherits: </b><a href="qobject.html">QObject</a>.</p>
<ul>
<li><a href="q3sqlform-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#Q3SqlForm">Q3SqlForm</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#dtor.Q3SqlForm">~Q3SqlForm</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#count">count</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#fieldToWidget">fieldToWidget</a></b> ( QSqlField * <i>field</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#insert">insert</a></b> ( QWidget * <i>widget</i>, const QString & <i>field</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#installPropertyMap">installPropertyMap</a></b> ( Q3SqlPropertyMap * <i>pmap</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#remove-2">remove</a></b> ( const QString & <i>field</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#setRecord">setRecord</a></b> ( QSqlRecord * <i>buf</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#widget">widget</a></b> ( int <i>i</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QSqlField * </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#widgetToField">widgetToField</a></b> ( QWidget * <i>widget</i> ) const</td></tr>
</table>
<ul>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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<a name="public-slots"></a>
<h2>Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#clear">clear</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#clearValues">clearValues</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#readField">readField</a></b> ( QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#readFields">readFields</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#writeField">writeField</a></b> ( QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#writeFields">writeFields</a></b> ()</td></tr>
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<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
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<a name="protected-functions"></a>
<h2>Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#insert-2">insert</a></b> ( QWidget * <i>widget</i>, QSqlField * <i>field</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3sqlform.html#remove">remove</a></b> ( QWidget * <i>widget</i> )</td></tr>
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<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
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<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
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<a name="details"></a>
<!-- $$$Q3SqlForm-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3SqlForm class creates and manages data entry forms tied to SQL databases.</p>
<p>Typical use of a Q3SqlForm consists of the following steps:</p>
<ul>
<li>Create the widgets you want to appear in the form.</li>
<li>Create a cursor and navigate to the record to be edited.</li>
<li>Create the Q3SqlForm.</li>
<li>Set the form's record buffer to the cursor's update buffer.</li>
<li>Insert each widget and the field it is to edit into the form.</li>
<li>Use <a href="q3sqlform.html#readFields">readFields</a>() to update the editor widgets with values from the database's fields.</li>
<li>Display the form and let the user edit values etc.</li>
<li>Use <a href="q3sqlform.html#writeFields">writeFields</a>() to update the database's field values with the values in the editor widgets.</li>
</ul>
<p>Note that a Q3SqlForm does not access the database directly, but most often via QSqlFields which are part of a <a href="q3sqlcursor.html">Q3SqlCursor</a>. A <a href="q3sqlcursor.html#insert">Q3SqlCursor::insert</a>(), <a href="q3sqlcursor.html#update">Q3SqlCursor::update</a>() or <a href="q3sqlcursor.html#del">Q3SqlCursor::del</a>() call is needed to actually write values to the database.</p>
<p>Some sample code to initialize a form successfully:</p>
<pre class="cpp"> <span class="type"><a href="qlineedit.html">QLineEdit</a></span> myEditor(<span class="keyword">this</span>);
<span class="type">Q3SqlForm</span> myForm(<span class="keyword">this</span>);
<span class="type"><a href="q3sqlcursor.html">Q3SqlCursor</a></span> myCursor(<span class="string">"mytable"</span>);
<span class="comment">// Execute a query to make the cursor valid</span>
myCursor<span class="operator">.</span>select();
<span class="comment">// Move the cursor to a valid record (the first record)</span>
myCursor<span class="operator">.</span>next();
<span class="comment">// Set the form's record pointer to the cursor's edit buffer (which</span>
<span class="comment">// contains the current record's values)</span>
myForm<span class="operator">.</span><a href="q3sqlform.html#setRecord">setRecord</a>(myCursor<span class="operator">.</span>primeUpdate());
<span class="comment">// Insert a field into the form that uses myEditor to edit the</span>
<span class="comment">// field 'somefield' in 'mytable'</span>
myForm<span class="operator">.</span><a href="q3sqlform.html#insert">insert</a>(<span class="operator">&</span>myEditor<span class="operator">,</span> <span class="string">"somefield"</span>);
<span class="comment">// Update myEditor with the value from the mapped database field</span>
myForm<span class="operator">.</span><a href="q3sqlform.html#readFields">readFields</a>();
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="comment">// Let the user edit the form</span>
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="comment">// Update the database</span>
myForm<span class="operator">.</span><a href="q3sqlform.html#writeFields">writeFields</a>(); <span class="comment">// Update the cursor's edit buffer from the form</span>
myCursor<span class="operator">.</span>update(); <span class="comment">// Update the database from the cursor's buffer</span></pre>
<p>If you want to use custom editors for displaying and editing data fields, you must install a custom <a href="q3sqlpropertymap.html">Q3SqlPropertyMap</a>. The form uses this object to get or set the value of a widget.</p>
</div>
<p><b>See also </b><a href="q3sqlform.html#installPropertyMap">installPropertyMap</a>() and <a href="q3sqlpropertymap.html">Q3SqlPropertyMap</a>.</p>
<!-- @@@Q3SqlForm -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3SqlForm[overload1]$$$Q3SqlFormQObject* -->
<h3 class="fn"><a name="Q3SqlForm"></a>Q3SqlForm::<span class="name">Q3SqlForm</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a <a href="q3sqlform.html" class="compat">Q3SqlForm</a> with parent <i>parent</i>.</p>
<!-- @@@Q3SqlForm -->
<!-- $$$~Q3SqlForm[overload1]$$$~Q3SqlForm -->
<h3 class="fn"><a name="dtor.Q3SqlForm"></a>Q3SqlForm::<span class="name">~Q3SqlForm</span> ()</h3>
<p>Destroys the object and frees any allocated resources.</p>
<!-- @@@~Q3SqlForm -->
<!-- $$$clear[overload1]$$$clear -->
<h3 class="fn"><a name="clear"></a><span class="type">void</span> Q3SqlForm::<span class="name">clear</span> ()<tt> [virtual slot]</tt></h3>
<p>Removes every widget, and the fields they're mapped to, from the form.</p>
<!-- @@@clear -->
<!-- $$$clearValues[overload1]$$$clearValues -->
<h3 class="fn"><a name="clearValues"></a><span class="type">void</span> Q3SqlForm::<span class="name">clearValues</span> ()<tt> [virtual slot]</tt></h3>
<p>Clears the values in all the widgets, and the fields they are mapped to, in the form, and sets them to NULL.</p>
<!-- @@@clearValues -->
<!-- $$$count[overload1]$$$count -->
<h3 class="fn"><a name="count"></a><span class="type">int</span> Q3SqlForm::<span class="name">count</span> () const</h3>
<p>Returns the number of widgets in the form.</p>
<!-- @@@count -->
<!-- $$$fieldToWidget[overload1]$$$fieldToWidgetQSqlField* -->
<h3 class="fn"><a name="fieldToWidget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * Q3SqlForm::<span class="name">fieldToWidget</span> ( <span class="type"><a href="qsqlfield.html">QSqlField</a></span> * <i>field</i> ) const</h3>
<p>Returns the widget that field <i>field</i> is mapped to.</p>
<!-- @@@fieldToWidget -->
<!-- $$$insert[overload1]$$$insertQWidget*constQString& -->
<h3 class="fn"><a name="insert"></a><span class="type">void</span> Q3SqlForm::<span class="name">insert</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i>, const <span class="type"><a href="qstring.html">QString</a></span> & <i>field</i> )<tt> [virtual]</tt></h3>
<p>Inserts a <i>widget</i>, and the name of the <i>field</i> it is to be mapped to, into the form. To actually associate inserted widgets with an edit buffer, use <a href="q3sqlform.html#setRecord">setRecord</a>().</p>
<p><b>See also </b><a href="q3sqlform.html#setRecord">setRecord</a>().</p>
<!-- @@@insert -->
<!-- $$$insert$$$insertQWidget*QSqlField* -->
<h3 class="fn"><a name="insert-2"></a><span class="type">void</span> Q3SqlForm::<span class="name">insert</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i>, <span class="type"><a href="qsqlfield.html">QSqlField</a></span> * <i>field</i> )<tt> [virtual protected]</tt></h3>
<p>This is an overloaded function.</p>
<p>Inserts a <i>widget</i>, and the <i>field</i> it is to be mapped to, into the form.</p>
<!-- @@@insert -->
<!-- $$$installPropertyMap[overload1]$$$installPropertyMapQ3SqlPropertyMap* -->
<h3 class="fn"><a name="installPropertyMap"></a><span class="type">void</span> Q3SqlForm::<span class="name">installPropertyMap</span> ( <span class="type"><a href="q3sqlpropertymap.html">Q3SqlPropertyMap</a></span> * <i>pmap</i> )</h3>
<p>Installs a custom <a href="q3sqlpropertymap.html" class="compat">Q3SqlPropertyMap</a>. This is useful if you plan to create your own custom editor widgets.</p>
<p><a href="q3sqlform.html" class="compat">Q3SqlForm</a> takes ownership of <i>pmap</i>, so <i>pmap</i> is deleted when <a href="q3sqlform.html" class="compat">Q3SqlForm</a> goes out of scope.</p>
<p><b>See also </b><a href="q3datatable.html#installEditorFactory">Q3DataTable::installEditorFactory</a>().</p>
<!-- @@@installPropertyMap -->
<!-- $$$readField[overload1]$$$readFieldQWidget* -->
<h3 class="fn"><a name="readField"></a><span class="type">void</span> Q3SqlForm::<span class="name">readField</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )<tt> [virtual slot]</tt></h3>
<p>Updates the widget <i>widget</i> with the value from the SQL field it is mapped to. Nothing happens if no SQL field is mapped to the <i>widget</i>.</p>
<!-- @@@readField -->
<!-- $$$readFields[overload1]$$$readFields -->
<h3 class="fn"><a name="readFields"></a><span class="type">void</span> Q3SqlForm::<span class="name">readFields</span> ()<tt> [virtual slot]</tt></h3>
<p>Updates the widgets in the form with current values from the SQL fields they are mapped to.</p>
<!-- @@@readFields -->
<!-- $$$remove[overload1]$$$removeQWidget* -->
<h3 class="fn"><a name="remove"></a><span class="type">void</span> Q3SqlForm::<span class="name">remove</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )<tt> [virtual protected]</tt></h3>
<p>Removes a <i>widget</i>, and hence the field it's mapped to, from the form.</p>
<!-- @@@remove -->
<!-- $$$remove$$$removeconstQString& -->
<h3 class="fn"><a name="remove-2"></a><span class="type">void</span> Q3SqlForm::<span class="name">remove</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>field</i> )<tt> [virtual]</tt></h3>
<p>This is an overloaded function.</p>
<p>Removes <i>field</i> from the form.</p>
<!-- @@@remove -->
<!-- $$$setRecord[overload1]$$$setRecordQSqlRecord* -->
<h3 class="fn"><a name="setRecord"></a><span class="type">void</span> Q3SqlForm::<span class="name">setRecord</span> ( <span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> * <i>buf</i> )<tt> [virtual]</tt></h3>
<p>Sets <i>buf</i> as the record buffer for the form. To force the display of the data from <i>buf</i>, use <a href="q3sqlform.html#readFields">readFields</a>().</p>
<p><b>See also </b><a href="q3sqlform.html#readFields">readFields</a>() and <a href="q3sqlform.html#writeFields">writeFields</a>().</p>
<!-- @@@setRecord -->
<!-- $$$widget[overload1]$$$widgetint -->
<h3 class="fn"><a name="widget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * Q3SqlForm::<span class="name">widget</span> ( <span class="type">int</span> <i>i</i> ) const</h3>
<p>Returns the <i>i</i>-th widget in the form. Useful for traversing the widgets in the form.</p>
<!-- @@@widget -->
<!-- $$$widgetToField[overload1]$$$widgetToFieldQWidget* -->
<h3 class="fn"><a name="widgetToField"></a><span class="type"><a href="qsqlfield.html">QSqlField</a></span> * Q3SqlForm::<span class="name">widgetToField</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> ) const</h3>
<p>Returns the SQL field that widget <i>widget</i> is mapped to.</p>
<!-- @@@widgetToField -->
<!-- $$$writeField[overload1]$$$writeFieldQWidget* -->
<h3 class="fn"><a name="writeField"></a><span class="type">void</span> Q3SqlForm::<span class="name">writeField</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )<tt> [virtual slot]</tt></h3>
<p>Updates the SQL field with the value from the <i>widget</i> it is mapped to. Nothing happens if no SQL field is mapped to the <i>widget</i>.</p>
<!-- @@@writeField -->
<!-- $$$writeFields[overload1]$$$writeFields -->
<h3 class="fn"><a name="writeFields"></a><span class="type">void</span> Q3SqlForm::<span class="name">writeFields</span> ()<tt> [virtual slot]</tt></h3>
<p>Updates the SQL fields with values from the widgets they are mapped to. To actually update the database with the contents of the record buffer, use <a href="q3sqlcursor.html#insert">Q3SqlCursor::insert</a>(), <a href="q3sqlcursor.html#update">Q3SqlCursor::update</a>() or <a href="q3sqlcursor.html#del">Q3SqlCursor::del</a>() as appropriate.</p>
<!-- @@@writeFields -->
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