The DropDownDataWindow (DDDW) edit style is one of PowerBuilder's outstanding
features. Yes, I know there are a lot of new and exciting capabilities in the
upcoming release of PowerBuilder, but in this article I'll try to solve some
of the current problems with the existing features that are popping up in
nearly every project I've seen.
Here I'll focus on DropDownDataWindows, including:
How to get started with DDDWs Filtering DDDWs without losing the display
value in other rows Catching the collapsing of a DDDW Trapping the cursor
keys in a DDDW Autocomplete DDDW values
Getting Started
The basics are well covered in the PowerBuilder User's Manual, but if you
still have problems defining them look at Figure 1. Click on the column you
want and its edit style (yes, click on edit on the properties) as DDDW
(choose DropDownDW as Style Type).
Next, choose your DataWindow, ... (more)
Most of the applications we software developers build need to interact
somehow with data from a database. The .NET Framework defined by Microsoft
provides a rich set of objects to manage database interaction; these classes
are collectively referred to as ADO.NET and the latest versions of DataWindow
.NET (which is now version 2.01).
SQL Anywhere (version 10) fits perfectly in this environment, making
development a lot easier; in addition, your applications will look good
without spending a lot of time painting the user interface. In this article
we'll look closer at exactly this... (more)
EAServer includes a powerful API called the Interface Repository. In this
article I'll create a small service component to clean this repository of
unwanted files that might be created when you deploy PowerBuilder components.
I'll show how to get all the packages associated with your server and read
your component's special properties.
With the Interface Repository you can do all the EAServer administration and
monitoring tasks, for example: Create and ping connection caches Query for
installed packages and components Get information about the server (OS,
version) Refresh/restar... (more)
In Part 1 (PBDJ, Vol. 9, issue 6) I discussed directory services and how they
provide authentication, access control, and finder services for our
application. In Part 2, I explain how the JNDI API lets us easily use LDAP.
JNDI Overview
The Java Naming and Directory Interface (JNDI) is an application programming
interface (API) that provides naming and directory functionality to Java
applications. It's independent of any specific directory service
implementation, thus a variety of directories - new, emerging, and already
deployed - can be accessed the same way.
JNDI Architecture
T... (more)
Web services is an emerging technology driven by the will to securely expose
business logic beyond the firewall. Through Web services you can encapsulate
existing business processes, publish them as services, search for and
subscribe to other services, and exchange information throughout and beyond
the enterprise. Web services will enable application-to-application
interaction without the need to know anything about application
implementations (languages, operating systems, tools) and without the need to
write connectors to each new application.
Gartner defines a Web service as ... (more)
Berndt Hamboeck is a senior consultant for BHITCON (www.bhitcon.net). He's a CSI, SCAPC8, EASAC, SCJP2, and started his Sybase development using PB5. You can reach him under admin@bhitcon.net.
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