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Konstantin Goldobin

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Top Stories by Konstantin Goldobin

PowerBuilder has a very handy way to make data entry more convenient: the DropDownDataWindow and DropDownListBox edit styles for DataWindow columns. Indeed, it's much simpler to pick up a value from a look-up list than to type it in each time you need to enter it. However, it looks like we've overlooked one of the cases when use of a drop-down list can make data entry easier for the user. Most of the time we use drop-down lists when working with lists of pairs "encoded value"/"decoded value": the users see and select decoded values and encoded values are saved in the database. The data type of the columns for which we use drop-down lists in such cases may be either string or integer, but it doesn't make any difference in terms of defining the edit style. Another instance when drop-down lists come in handy is when there is a predefined list of all possible values th... (more)

Highlighting Selected Text in PowerBuilder DataWindow

Let's suppose that you have a search window where a user can enter a search string and get the list of text items matching this pattern. Ideally, the portions of text that meet the search criteria should be highlighted, for example, by text formatting. It could look like Figure 1. In PowerBuilder we have a great tool for searching and displaying information - the DataWindow. But how can we do text formatting inside a DataWindow column? Unfortunately, there's no way in the DataWindow object to do that. This article describes a technique that will let you simulate this. A Sample Da... (more)

Getting Rid of Global Variables

It may seem as if PowerBuilder programmers are bound to use global variables. Even the PFC, which is said to be the most successfully designed object-oriented framework, requires the use of global variables. Is it something in the nature of PowerBuilder that makes us use them? I won't discuss whether it's good or bad to use global variables as enough has been said on this subject. However, I am going to discuss why global variables are usually used in PowerBuilder applications and how we can live without them. When Global Variables Are Used Let's face it, if you use global variabl... (more)

Exploring DataWindow Display Formats

DataWindow display formats aren't a big secret. Most PowerBuilder developers use them to format numeric, date, time, and string values properly. Such display formats are usually straightforward and contain characters that have special meaning for a specific datatype like '#' for numeric values or '@' for string values. However, the DataWindow display format is a very powerful tool and you can get more than simple data formatting. This article explores what you can do with DataWindow display formats demonstrating a few tricks. Using Regular Characters A DataWindow display format ca... (more)

Make Your Design Ideas Speak: Using UML in PowerBuilder Projects

PowerBuilder Developer's Journal A picture is worth a thousand words. We all have heard this saying a countless number of times. But what if you don't understand what is drawn in the picture? I was approached once with a request to review requirements specifications for some module. The document contained a scheme that represented the place of the module within the system. The picture was mainly made of rectangles and arrows. The rectangles had labels and I figured out that they represented other modules in the system. But I couldn't understand the meaning of the arrows. When I ... (more)