<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/sql/qsqlform.cpp:61 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>TQSqlForm Class</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQSqlForm Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1> <p>The TQSqlForm class creates and manages data entry forms tied to SQL databases. <a href="#details">More...</a> <p><tt>#include <<a href="qsqlform-h.html">ntqsqlform.h</a>></tt> <p>Inherits <a href="ntqobject.html">TQObject</a>. <p><a href="qsqlform-members.html">List of all member functions.</a> <h2>Public Members</h2> <ul> <li class=fn><a href="#TQSqlForm"><b>TQSqlForm</b></a> ( TQObject * parent = 0, const char * name = 0 )</li> <li class=fn><a href="#~TQSqlForm"><b>~TQSqlForm</b></a> ()</li> <li class=fn>virtual void <a href="#insert"><b>insert</b></a> ( TQWidget * widget, const TQString & field )</li> <li class=fn>virtual void <a href="#remove-2"><b>remove</b></a> ( const TQString & field )</li> <li class=fn>uint <a href="#count"><b>count</b></a> () const</li> <li class=fn>TQWidget * <a href="#widget"><b>widget</b></a> ( uint i ) const</li> <li class=fn>TQSqlField * <a href="#widgetToField"><b>widgetToField</b></a> ( TQWidget * widget ) const</li> <li class=fn>TQWidget * <a href="#fieldToWidget"><b>fieldToWidget</b></a> ( TQSqlField * field ) const</li> <li class=fn>void <a href="#installPropertyMap"><b>installPropertyMap</b></a> ( TQSqlPropertyMap * pmap )</li> <li class=fn>virtual void <a href="#setRecord"><b>setRecord</b></a> ( TQSqlRecord * buf )</li> </ul> <h2>Public Slots</h2> <ul> <li class=fn>virtual void <a href="#readField"><b>readField</b></a> ( TQWidget * widget )</li> <li class=fn>virtual void <a href="#writeField"><b>writeField</b></a> ( TQWidget * widget )</li> <li class=fn>virtual void <a href="#readFields"><b>readFields</b></a> ()</li> <li class=fn>virtual void <a href="#writeFields"><b>writeFields</b></a> ()</li> <li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li> <li class=fn>virtual void <a href="#clearValues"><b>clearValues</b></a> ( bool nullify = FALSE )</li> </ul> <h2>Protected Members</h2> <ul> <li class=fn>virtual void <a href="#insert-2"><b>insert</b></a> ( TQWidget * widget, TQSqlField * field )</li> <li class=fn>virtual void <a href="#remove"><b>remove</b></a> ( TQWidget * widget )</li> </ul> <hr><a name="details"></a><h2>Detailed Description</h2> The TQSqlForm class creates and manages data entry forms tied to SQL databases. <p> <p> Typical use of a TQSqlForm consists of the following steps: <ul> <li> Create the widgets you want to appear in the form. <li> Create a cursor and navigate to the record to be edited. <li> Create the TQSqlForm. <li> Set the form's record buffer to the cursor's update buffer. <li> Insert each widget and the field it is to edit into the form. <li> Use <a href="#readFields">readFields</a>() to update the editor widgets with values from the database's fields. <li> Display the form and let the user edit values etc. <li> Use <a href="#writeFields">writeFields</a>() to update the database's field values with the values in the editor widgets. </ul> <p> Note that a TQSqlForm does not access the database directly, but most often via TQSqlFields which are part of a <a href="ntqsqlcursor.html">TQSqlCursor</a>. A <a href="ntqsqlcursor.html#insert">TQSqlCursor::insert</a>(), <a href="ntqsqlcursor.html#update">TQSqlCursor::update</a>() or <a href="ntqsqlcursor.html#del">TQSqlCursor::del</a>() call is needed to actually write values to the database. <p> Some sample code to initialize a form successfully: <p> <pre> <a href="ntqlineedit.html">TQLineEdit</a> myEditor( this ); TQSqlForm myForm( this ); <a href="ntqsqlcursor.html">TQSqlCursor</a> myCursor( "mytable" ); // Execute a query to make the cursor valid myCursor.<a href="ntqsqlcursor.html#select">select</a>(); // Move the cursor to a valid record (the first record) myCursor.<a href="ntqsqlquery.html#next">next</a>(); // Set the form's record pointer to the cursor's edit buffer (which // contains the current record's values) myForm.<a href="#setRecord">setRecord</a>( myCursor.<a href="ntqsqlcursor.html#primeUpdate">primeUpdate</a>() ); // Insert a field into the form that uses myEditor to edit the // field 'somefield' in 'mytable' myForm.<a href="#insert">insert</a>( &myEditor, "somefield" ); // Update myEditor with the value from the mapped database field myForm.<a href="#readFields">readFields</a>(); ... // Let the user edit the form ... // Update the database myForm.<a href="#writeFields">writeFields</a>(); // Update the cursor's edit buffer from the form myCursor.<a href="ntqsqlcursor.html#update">update</a>(); // Update the database from the cursor's buffer </pre> <p> If you want to use custom editors for displaying and editing data fields, you must install a custom <a href="ntqsqlpropertymap.html">TQSqlPropertyMap</a>. The form uses this object to get or set the value of a widget. <p> Note that <a href="designer-manual.html">TQt Designer</a> provides a visual means of creating data-aware forms. <p> <p>See also <a href="#installPropertyMap">installPropertyMap</a>(), <a href="ntqsqlpropertymap.html">TQSqlPropertyMap</a>, and <a href="database.html">Database Classes</a>. <hr><h2>Member Function Documentation</h2> <h3 class=fn><a name="TQSqlForm"></a>TQSqlForm::TQSqlForm ( <a href="ntqobject.html">TQObject</a> * parent = 0, const char * name = 0 ) </h3> Constructs a TQSqlForm with parent <em>parent</em> and called <em>name</em>. <h3 class=fn><a name="~TQSqlForm"></a>TQSqlForm::~TQSqlForm () </h3> Destroys the object and frees any allocated resources. <h3 class=fn>void <a name="clear"></a>TQSqlForm::clear ()<tt> [virtual slot]</tt> </h3> Removes every widget, and the fields they're mapped to, from the form. <h3 class=fn>void <a name="clearValues"></a>TQSqlForm::clearValues ( bool nullify = FALSE )<tt> [virtual slot]</tt> </h3> Clears the values in all the widgets, and the fields they are mapped to, in the form. If <em>nullify</em> is TRUE (the default is FALSE), each field is also set to NULL. <h3 class=fn>uint <a name="count"></a>TQSqlForm::count () const </h3> Returns the number of widgets in the form. <h3 class=fn><a href="ntqwidget.html">TQWidget</a> * <a name="fieldToWidget"></a>TQSqlForm::fieldToWidget ( <a href="ntqsqlfield.html">TQSqlField</a> * field ) const </h3> Returns the widget that field <em>field</em> is mapped to. <h3 class=fn>void <a name="insert"></a>TQSqlForm::insert ( <a href="ntqwidget.html">TQWidget</a> * widget, const <a href="ntqstring.html">TQString</a> & field )<tt> [virtual]</tt> </h3> Inserts a <em>widget</em>, and the name of the <em>field</em> it is to be mapped to, into the form. To actually associate inserted widgets with an edit buffer, use <a href="#setRecord">setRecord</a>(). <p> <p>See also <a href="#setRecord">setRecord</a>(). <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>. <h3 class=fn>void <a name="insert-2"></a>TQSqlForm::insert ( <a href="ntqwidget.html">TQWidget</a> * widget, <a href="ntqsqlfield.html">TQSqlField</a> * field )<tt> [virtual protected]</tt> </h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. <p> Inserts a <em>widget</em>, and the <em>field</em> it is to be mapped to, into the form. <h3 class=fn>void <a name="installPropertyMap"></a>TQSqlForm::installPropertyMap ( <a href="ntqsqlpropertymap.html">TQSqlPropertyMap</a> * pmap ) </h3> Installs a custom <a href="ntqsqlpropertymap.html">TQSqlPropertyMap</a>. This is useful if you plan to create your own custom editor widgets. <p> TQSqlForm takes ownership of <em>pmap</em>, so <em>pmap</em> is deleted when TQSqlForm goes out of scope. <p> <p>See also <a href="ntqdatatable.html#installEditorFactory">TQDataTable::installEditorFactory</a>(). <p>Example: <a href="sql.html#x2237">sql/overview/custom1/main.cpp</a>. <h3 class=fn>void <a name="readField"></a>TQSqlForm::readField ( <a href="ntqwidget.html">TQWidget</a> * widget )<tt> [virtual slot]</tt> </h3> Updates the widget <em>widget</em> with the value from the SQL field it is mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>. <h3 class=fn>void <a name="readFields"></a>TQSqlForm::readFields ()<tt> [virtual slot]</tt> </h3> Updates the widgets in the form with current values from the SQL fields they are mapped to. <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>. <h3 class=fn>void <a name="remove"></a>TQSqlForm::remove ( <a href="ntqwidget.html">TQWidget</a> * widget )<tt> [virtual protected]</tt> </h3> Removes a <em>widget</em>, and hence the field it's mapped to, from the form. <h3 class=fn>void <a name="remove-2"></a>TQSqlForm::remove ( const <a href="ntqstring.html">TQString</a> & field )<tt> [virtual]</tt> </h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. <p> Removes <em>field</em> from the form. <h3 class=fn>void <a name="setRecord"></a>TQSqlForm::setRecord ( <a href="ntqsqlrecord.html">TQSqlRecord</a> * buf )<tt> [virtual]</tt> </h3> Sets <em>buf</em> as the record buffer for the form. To force the display of the data from <em>buf</em>, use <a href="#readFields">readFields</a>(). <p> <p>See also <a href="#readFields">readFields</a>() and <a href="#writeFields">writeFields</a>(). <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>. <h3 class=fn><a href="ntqwidget.html">TQWidget</a> * <a name="widget"></a>TQSqlForm::widget ( uint i ) const </h3> Returns the <em>i</em>-th widget in the form. Useful for traversing the widgets in the form. <h3 class=fn><a href="ntqsqlfield.html">TQSqlField</a> * <a name="widgetToField"></a>TQSqlForm::widgetToField ( <a href="ntqwidget.html">TQWidget</a> * widget ) const </h3> Returns the SQL field that widget <em>widget</em> is mapped to. <h3 class=fn>void <a name="writeField"></a>TQSqlForm::writeField ( <a href="ntqwidget.html">TQWidget</a> * widget )<tt> [virtual slot]</tt> </h3> Updates the SQL field with the value from the <em>widget</em> it is mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>. <h3 class=fn>void <a name="writeFields"></a>TQSqlForm::writeFields ()<tt> [virtual slot]</tt> </h3> 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="ntqsqlcursor.html#insert">TQSqlCursor::insert</a>(), <a href="ntqsqlcursor.html#update">TQSqlCursor::update</a>() or <a href="ntqsqlcursor.html#del">TQSqlCursor::del</a>() as appropriate. <p>Example: <a href="sql.html#x2234">sql/overview/form2/main.cpp</a>. <!-- eof --> <hr><p> This file is part of the <a href="index.html">TQt toolkit</a>. Copyright © 1995-2007 <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>TQt 3.3.8</div> </table></div></address></body> </html>