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CentOS 7.0 - man page for qsqlform (centos section 3qt)

QSqlForm(3qt)									    QSqlForm(3qt)

NAME
       QSqlForm - Creates and manages data entry forms tied to SQL databases

SYNOPSIS
       #include <qsqlform.h>

       Inherits QObject.

   Public Members
       QSqlForm ( QObject * parent = 0, const char * name = 0 )
       ~QSqlForm ()
       virtual void insert ( QWidget * widget, const QString & field )
       virtual void remove ( const QString & field )
       uint count () const
       QWidget * widget ( uint i ) const
       QSqlField * widgetToField ( QWidget * widget ) const
       QWidget * fieldToWidget ( QSqlField * field ) const
       void installPropertyMap ( QSqlPropertyMap * pmap )
       virtual void setRecord ( QSqlRecord * buf )

   Public Slots
       virtual void readField ( QWidget * widget )
       virtual void writeField ( QWidget * widget )
       virtual void readFields ()
       virtual void writeFields ()
       virtual void clear ()
       virtual void clearValues ( bool nullify = FALSE )

   Protected Members
       virtual void insert ( QWidget * widget, QSqlField * field )
       virtual void remove ( QWidget * widget )

DESCRIPTION
       The QSqlForm class creates and manages data entry forms tied to SQL databases.

       Typical use of a QSqlForm consists of the following steps:

       Create the widgets you want to appear in the form.

       Create a cursor and navigate to the record to be edited.

       Create the QSqlForm.

       Set the form's record buffer to the cursor's update buffer.

       Insert each widget and the field it is to edit into the form.

       Use readFields() to update the editor widgets with values from the database's fields.

       Display the form and let the user edit values etc.

       Use writeFields() to update the database's field values with the values in the editor
       widgets.

       Note that a QSqlForm does not access the database directly, but most often via QSqlFields
       which are part of a QSqlCursor. A QSqlCursor::insert(), QSqlCursor::update() or
       QSqlCursor::del() call is needed to actually write values to the database.

       Some sample code to initialize a form successfully:

	   QLineEdit  myEditor( this );
	   QSqlForm   myForm( this );
	   QSqlCursor myCursor( "mytable" );
	   // Execute a query to make the cursor valid
	   myCursor.select();
	   // Move the cursor to a valid record (the first record)
	   myCursor.next();
	   // Set the form's record pointer to the cursor's edit buffer (which
	   // contains the current record's values)
	   myForm.setRecord( myCursor.primeUpdate() );
	   // Insert a field into the form that uses myEditor to edit the
	   // field 'somefield' in 'mytable'
	   myForm.insert( &myEditor, "somefield" );
	   // Update myEditor with the value from the mapped database field
	   myForm.readFields();
	   ...
	   // Let the user edit the form
	   ...
	   // Update the database
	   myForm.writeFields();  // Update the cursor's edit buffer from the form
	   myCursor.update();  // Update the database from the cursor's buffer

       If you want to use custom editors for displaying and editing data fields, you must install
       a custom QSqlPropertyMap. The form uses this object to get or set the value of a widget.

       Note that Qt Designer provides a visual means of creating data-aware forms.

       See also installPropertyMap(), QSqlPropertyMap, and Database Classes.

MEMBER FUNCTION DOCUMENTATION
QSqlForm::QSqlForm ( QObject * parent = 0, const char * name = 0 )
       Constructs a QSqlForm with parent parent and called name.

QSqlForm::~QSqlForm ()
       Destroys the object and frees any allocated resources.

void QSqlForm::clear () [virtual slot]
       Removes every widget, and the fields they're mapped to, from the form.

void QSqlForm::clearValues ( bool nullify = FALSE ) [virtual slot]
       Clears the values in all the widgets, and the fields they are mapped to, in the form. If
       nullify is TRUE (the default is FALSE), each field is also set to NULL.

uint QSqlForm::count () const
       Returns the number of widgets in the form.

QWidget * QSqlForm::fieldToWidget ( QSqlField * field ) const
       Returns the widget that field field is mapped to.

void QSqlForm::insert ( QWidget * widget, const QString & field ) [virtual]
       Inserts a widget, and the name of the field it is to be mapped to, into the form. To
       actually associate inserted widgets with an edit buffer, use setRecord().

       See also setRecord().

       Examples:

void QSqlForm::insert ( QWidget * widget, QSqlField * field ) [virtual protected]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Inserts a widget, and the field it is to be mapped to, into the form.

void QSqlForm::installPropertyMap ( QSqlPropertyMap * pmap )
       Installs a custom QSqlPropertyMap. This is useful if you plan to create your own custom
       editor widgets.

       QSqlForm takes ownership of pmap, so pmap is deleted when QSqlForm goes out of scope.

       See also QDataTable::installEditorFactory().

       Example: sql/overview/custom1/main.cpp.

void QSqlForm::readField ( QWidget * widget ) [virtual slot]
       Updates the widget widget with the value from the SQL field it is mapped to. Nothing
       happens if no SQL field is mapped to the widget.

void QSqlForm::readFields () [virtual slot]
       Updates the widgets in the form with current values from the SQL fields they are mapped
       to.

       Examples:

void QSqlForm::remove ( QWidget * widget ) [virtual protected]
       Removes a widget, and hence the field it's mapped to, from the form.

void QSqlForm::remove ( const QString & field ) [virtual]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Removes field from the form.

void QSqlForm::setRecord ( QSqlRecord * buf ) [virtual]
       Sets buf as the record buffer for the form. To force the display of the data from buf, use
       readFields().

       See also readFields() and writeFields().

       Examples:

QWidget * QSqlForm::widget ( uint i ) const
       Returns the i-th widget in the form. Useful for traversing the widgets in the form.

QSqlField * QSqlForm::widgetToField ( QWidget * widget ) const
       Returns the SQL field that widget widget is mapped to.

void QSqlForm::writeField ( QWidget * widget ) [virtual slot]
       Updates the SQL field with the value from the widget it is mapped to. Nothing happens if
       no SQL field is mapped to the widget.

void QSqlForm::writeFields () [virtual slot]
       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 QSqlCursor::insert(),
       QSqlCursor::update() or QSqlCursor::del() as appropriate.

       Example: sql/overview/form2/main.cpp.

SEE ALSO
       http://doc.trolltech.com/qsqlform.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file
       included in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qsqlform.3qt) and the Qt version (3.3.8).

Trolltech AS				 2 February 2007			    QSqlForm(3qt)


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