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John Olson

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Top Stories by John Olson

Last year, after migrating a client's application from PFC 5.0.02 to 6.5, then applying some enhancements to take advantage of new features, the program began giving the following PFC error message: "For certain functionality the PFC DataStore requires a reference to its parent window. One of these cases has been encountered. To let the DataStore know who its parent window is, call the of_SetParentWindow() function after the DataStore creation." At first I was disturbed that the PFC developers had coupled the DataStore to a parent object. And worse, not only a parent object, but a window object. This would mean that every DataStore had to be associated with a window. I assumed I'd be forced to use my frame window as a parent for all the "free range" DataStores in my application. After analyzing the PFC code changes, I realized that the DataStore requires a parent w... (more)

TechWave 2000

This year's TechWave was a marked improvement over the last few years. Overall I'd have to say that 1994 and 1995 were the best Sybase Tools conferences ever. Since then their value to me has declined, though they were still worth the time and money. The two areas in which I've been disappointed in past years were the technical sessions and Sybase's inability to communicate their vision. TechWave 2000 contrasted sharply. Sessions Most markedly, in 1997 and 1998, rather than having a good mix of beginner to advanced topics, I found the sessions to be too basic, though undoubtedly ... (more)

Two Heads Are Better Than One

After careful consideration I've come to the conclusion that having two heads is better than having just one. While it may sound like I'm simply stating the obvious, in fact, most people have only one head.1 However, those who are blessed with two heads enjoy a measurable advantage over their single-headed rivals. This conclusion was affirmed in a headline-grabbing paper by two Princeton economists for the National Bureau of Economic Research entitled "Are Two Heads Better Than One?"2 Having multiple heads is most beneficial when performing work that requires multitasking, such ... (more)

We're Not in Kansas Anymore, Toto

If you're a regular reader you've probably noticed the recent evolution of this magazine from focusing specifically on PowerBuilder to covering the several tools included in EAStudio as well as the Enterprise Application Server. Though still called PowerBuilder Developer's Journal, this magazine now also has a subtitle: Enterprise Application Studio. While proud of our long history of cutting-edge PowerBuilder articles, we recognize that, as a lone software development tool, PB doesn't generate the interest it used to. Nearly 10 years after the first release of PowerBuilder, thi... (more)

Advanced WebDW HTML Generation

Okay, so I've been promoting the inclusion of PB client/server articles, yet here I am writing about the Web DataWindow. Don't stop reading! This article applies to all PB developers, whether n-tier or client/server. That said, I now have to prove that this article is important to client/server developers.... Here's my angle: HTML has become a standard beyond Web development. People doing work unrelated to the Web, even nonprogrammers, need to learn the basics of HTML. Here's an example: I'm a consultant and I invoice my customers using QuickBooks. When I generate my invoices I ... (more)