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Helping Developers Master PowerBuilder Classic and .NET

Yakov Werde

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Top Stories by Yakov Werde

In this article we'll explore basic aspects of data binding, one of WPF's core features. XAML data binding is a codeless (declarative) way of transferring information from one object to another. It's very helpful in a UI where data originating in one object controls a characteristic of (or is the source of data displayed in) another object. Data binding's main benefit is to greatly reduce (if not eliminate) the number of lines of procedural code you have to write in code behind class event handlers. Taken to its full extent, it's possible for a designer (a non-programmer) to define both the GUI's look and feel as well as its behavior within a design tool without resorting to programmer assistance. Figure 1 shows a simple example. The window has a horizontal slide bar and a static text. Moving the track bar slider changes the size of the static text. To synchronize... (more)

Vendor Independent Data Access in EAServer 3.6.1

It's well known that Sun Microsystems' Enterprise JavaBean (EJB) specification is an industry-standard, vendor-neutral, portable architecture for middle-tier transactional components. In an industry starved for standardization, both the server vendor and the development community have embraced EJB. Sybase is a leading member of the J2EE consortium. Sybase's EAServer version 3.0 supported EJB 0.4, version 3.5 supported EJB 1.0, and the recently released J2EE-compatible EAServer version 3.6.1 supports the latest EJB 1.1 specification. The EJB 1.1 specification offers many enhanceme... (more)

Migration Roundtable

I taught a full day .NET seminar to an ISUG group in Minneapolis today. 19 developers attended. During the migration unit I demo'd and showed how mapped custom events, not on the control supported list, are migrated BUT, during compile, do not generate a warning. Even worse at runtime they are never invoked. The implication is that important GUI code is migrated but will never be invoked! I pointed out to the seminar attendees, that this is a potentially big hole in the migration/build process. I also mentioned that the only way I know of to detect non-functioning mapped events w... (more)

Case Study: Refactoring a PowerBuilder Classic Application

Under heavy Confederate fire, wounded, surrounded, with one third of his men lost, Union General John Corse is holding the fort on the top of the hill in the US Civil War battle of Altoona. Peering into the distance, he sees a white signal flag waving. It is a message from General Sherman; "Hold the fort, for we are coming!" Greatly strengthened by the thought of salvation and the enemy weakened by the thought of a large attack, General Corse and his men rebuff the Confederate attackers. (See this link to learn more about the battle.) Mature, feature-rich, market-leading softwar... (more)

Breaking Platform Limitations

One of the innovative new features in the PowerBuilder 12.5.1 release is its ability to deploy PowerBuilder .NET code to run in 64-bit mode on 64-bit Windows platforms. In this article, after gaining background and perspective on 32- and 64-bit memory management and .NET deployment models, you'll explore the internals, strengths and limitations of this new feature. Introduction Almost all current server, desktop and notebook hardware platforms have 64-bit processors. Almost all current versions of Windows operating systems support both 32- and 64-bit platforms. With the 12.5.1 rel... (more)