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Richard (Rik) Brooks

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This article describes how to create a grid presentation window that allows sorting by clicking on the column header. To begin we need to create a grid DataWindow. I'm selecting just a few columns from the employee table. Here is my sql for the DataWindow in Figure 1. Once we have created it I get the DataWindow painter shown in Figure 2. There are several changes that we need to make. Let's change the status column so it's no longer a set of radio buttons. This is a read-only screen so let's remove the status and add a computed field. To do this let's remove the Status column altogether. Then add a computed field in its place. Let's pause for just a moment and talk about that expression for the computed field. This is an IF function. The format is IF(EXPRESSION, TRUE, FALSE). If the expression evaluates to TRUE then the function returns the first argument, othe... (more)

Advanced DataWindow Sorting

This article provides a means of automating the sorting of DataWindows... not just grid DataWindows as discussed in last month's article, but all DataWindows, regardless of display format. Bear in mind that we are writing programmer tools. When writing for programmers we want to give the programmer the maximum number of options while minimizing the programmer effort. In other words, default as much as possible but allow the programmer to move beyond the defaults. We have several action items to implement: Do the housekeeping to get an application going Create a window for sorting.... (more)

Automating Formats and Edit Styles

I'm considering changing my emphasis in my column. Since speaking with some people at Sybase I am convinced that PowerBuilder is poised for a mighty comeback. The fact is that still today PowerBuilder is by far the most productive development tool available. It eclipses all the rest. An experienced PowerBuilder programmer is demonstrably more productive and can finish tasks faster than C# or even VB.NET. So why is .NET used by more companies? Mine would just be a guess and in fact, the answer is irrelevant. I'm here to tell you that Sybase is making an obvious push to regain some... (more)

Extending SQLCA

We are going to create a bare-bones email object. Of course you can expand that in the future if you like, but for now, let's just create the functionality that we need. I start by creating a custom class. In case you aren't familiar with the process look at Figure 1. Let's start with an instance variable. N_cst_mailer Instance Variables private mailMessage io_mail_message // The message to send I made the instance variables private so let's write a couple of functions to populate our mail Message. We'll start with the TO. Note that the io_mail_message contains an array of objec... (more)

Using the Tag Property – Part 3

This is the third and final part of a series presenting a proposal for the use of the tag property of DataWindow columns. My original thought was to provide a means to automatically set a microhelp for each column. Of course, if you are using an MDI application you have a function to set the microhelp, but that function is only available in MDI. If you are using any other application type, then this is not available to you. Even if you do have an MDI, I have found that the microhelp is not as useful as I would like. The microhelp is always on the frame, nowhere near the column. ... (more)