QSqlForm

NAME

SYNOPSIS

Inherits QObject.

Public Members

Public Slots

Protected Members

DESCRIPTION

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 )

QSqlForm::~QSqlForm ()

void QSqlForm::clear () [virtual slot]

void QSqlForm::clearValues ( bool nullify = FALSE ) [virtual slot]

uint QSqlForm::count () const

QWidget * QSqlForm::fieldToWidget ( QSqlField * field ) const

void QSqlForm::insert ( QWidget * widget, const QString & field ) [virtual]

See also setRecord().

Examples:  

void QSqlForm::insert ( QWidget * widget, QSqlField * field ) [virtual protected]

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

void QSqlForm::installPropertyMap ( QSqlPropertyMap * pmap )

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]

void QSqlForm::readFields () [virtual slot]

Examples:  

void QSqlForm::remove ( QWidget * widget ) [virtual protected]

void QSqlForm::remove ( const QString & field ) [virtual]

Removes field from the form.  

void QSqlForm::setRecord ( QSqlRecord * buf ) [virtual]

See also readFields() and writeFields().

Examples:  

QWidget * QSqlForm::widget ( uint i ) const

QSqlField * QSqlForm::widgetToField ( QWidget * widget ) const

void QSqlForm::writeField ( QWidget * widget ) [virtual slot]

void QSqlForm::writeFields () [virtual slot]

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

SEE ALSO

COPYRIGHT

AUTHOR

BUGS