About DataWindow objects, controls, and components – PB Docs 126

About DataWindow objects, controls, and components

DataWindow technology is implemented in two parts:

  • A DataWindow object

    The DataWindow object defines the data source and presentation
    style for the data.

  • A DataWindow control or component

    The control or component is a container for the DataWindow
    object in the application. You write code that calls methods of
    the container to manipulate the DataWindow object.

DataWindow controls and components

The DataWindow was originally invented for use in PowerBuilder
to provide powerful data retrieval, manipulation, and update capabilities
for client/server applications. Now the DataWindow is available
in several environments:

  • PowerBuilder
    DataWindow

    A PowerBuilder control for use in client/server and
    distributed PowerBuilder applications.

  • Web DataWindow

    A thin-client DataWindow implementation for Web applications
    that provides most of the data manipulation, presentation, and scripting
    capabilities of the PowerBuilder DataWindow, requiring the Web DataWindow
    component on a component server but no PowerBuilder DLLs on the
    client. The Web DataWindow can be implemented in three ways:

    • XML Web DataWindow

      Separate XML (content), XSLT (layout), and CSS (style) with
      a subsequent transformation to XHTML

    • XHTML Web DataWindow

      XHTML

    • HTML Web DataWindow

      HTML

  • SAP DataWindow Web control for ActiveX

    An ActiveX control for use on Web pages. The client browser
    must support ActiveX controls to display a DataWindow object used
    by this control.

  • WPF DataWindow

    Windows Presentation Foundation DataWindow with managed code.
    In the PowerBuilder .NET IDE, you can create WPF Window Application
    targets. For more information, refer to the PowerBuilder .NET documentation.

For a comparison of each of these environments, see “Choosing a DataWindow technology”.

You can also use DataStore objects as containers for a DataWindow
object. DataStores provide DataWindow functionality for retrieving
and manipulating data without the on-screen display. Uses for DataStores
include specifying layouts for printing and managing data in the
server component of a distributed application.

What DataWindow objects are

A DataWindow object is an object that you use to retrieve,
present, and manipulate data from a relational database or other
data source (such as an Excel worksheet or dBASE file). You can
specify whether the DataWindow object supports updating of data.

DataWindow objects have knowledge about the data they are
retrieving. You can specify display formats, presentation styles,
and other data properties to make the data meaningful to users.

In the DataWindow painter, you can also make Powersoft report
(PSR) files, which you can use in DataWindow controls or components.
A PSR file contains a report definition—essentially a nonupdatable
DataWindow object—as well as the data contained in the
report when the PSR file was created. It does not retrieve data.

Where to define DataWindow objects

You define DataWindow objects in the PowerBuilder DataWindow
painter. You
can also define nonupdatable DataWindow objects in the InfoMaker Report
painter.


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