RPG IV Archives - IT Jungle

Guru Classic: The Efficiency of Varying Length Character Variables

August 14, 2019 Jon Paris

Remember the bad old days when dinosaurs still roamed the earth and the only way to build strings in RPG involved playing silly games with arrays? Or worse still, obscure combinations of MOVE operations? Thankfully those days are far behind us — although sadly there are still a few RPG/400 dinosaurs coding away!

RPG IV introduced many powerful new string handling options, such as the %TRIMx family of BIFs, but even now there are capabilities in the language that few programmers fully exploit. One of my favorites is variable length fields. This lack of familiarity made this tip an obvious …
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Guru Classic: Looking For Commitment, Part 1

June 19, 2019 Paul Tuohy

Author’s Note: This set of three articles was originally published in March of 2009. (See links in Related Stories below). As companies look to modernizing their applications, commitment control can play an integral role. In my next three Guru Classic articles, I will be updating the content of these articles for free-form RPG.

In this article, I will discuss what commitment control is, why you may want to use it, and the basic requirements for commitment control. In subsequent articles, I will look more closely at how commitment control works, different ways in which it can be implemented, …
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Speaking The SQL Lingua Franca On IBM i

June 3, 2019 Timothy Prickett Morgan

No matter what the job is, we all start out somewhere that is pretty far from being an expert and we depend on our elders and mentors to help us learn all the tricks and get good at the work.

So it is with the nearly ubiquitous database query language, Structured Query Language, or SQL for short. It started out in the head of IBMer Ted Codd back in 1969, which was coincidentally when the System/3 minicomputer launched and its successor many generations later, the System/38 in 1978, was the first IBM system and the first system in the world …
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Settling In With IBM i For The Long Haul

February 11, 2019 Timothy Prickett Morgan

If nothing else, the IBM i platform has exhibited extraordinary longevity. One might even say legendary longevity, if you want to take its history all the way back to the System/3 minicomputer from 1969. This is the real starting point in the AS/400 family tree and this is when Big Blue, for very sound legal and technical and marketing reasons, decided to fork its products to address the unique needs of large enterprises (with the System/360 mainframe and its follow-ons) and small and medium businesses (starting with the System/3 and moving on through the System/34, System/32, System/38, and System/36 in …
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PASE Versus ILE: Which Is Best For Open Source?

October 22, 2018 Alex Woodie

Open source has emerged as a driver of innovation in the past 20 years, and has greatly accelerated technological innovation. The proprietary IBM i platform has also benefited from this trend, thanks in large part to the capability to run Linux applications in the PASE runtime. But some members of the IBM i community are concerned that the fruits of the open source innovation have not tasted quite as sweet as they do on other platforms.

Linux was the original breakout star in open source software, and so it should be no surprise that the vast majority of software developed …
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Modern Lessons From A Fresh IBM i Developer

October 8, 2018 Alex Woodie

Application modernization is a big nut to crack on IBM i. That is to say, there are many ways to tackle the problem, from the code and business logic to the databases and user interfaces. But when it comes to the type of developers you should look for and how they should spend their time, Kody Robinson has a few pointers that may be worth keeping in mind.

Robinson was a member of the first batch of “Fresh Faces” that IBM put forward in 2017 to showcase the fact that young people are building careers on the platform, and that …
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ARCAD Debuts RPG Code Checker

October 3, 2018 Alex Woodie

If you write RPG, or know somebody who does, then you realize that mistakes can and will happen. However, beyond the obvious syntax errors, which should be detected immediately by the code editor, are instances where the code is sloppy or just poorly written. Those are the instances where ARCAD Software hopes to help with its new CodeChecker offering.

ARCAD-CodeChecker, as the product is officially called, does just that: Detect poor quality RPG code before it makes it into production. If you’ve coded a bug into the program, made a design error, or taken 1,000 lines to write something that …
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Guru: Refactoring RPG – Indicators

July 30, 2018 Ted Holt

Occasionally I hear someone comment about how terrible indicators are. I don’t think they’re bad. Indicator-laden RPG helped me graduate debt-free with a computer science degree and housed, clothed, and fed my family for several years. I prefer to say that indicators were good for their time, but now we have better programming techniques that I much prefer to use.

Refactoring code to reduce or even eliminate the use of predefined indicators (not indicator variables) can pay off big in benefits. The fewer indicators a program uses, the easier it tends to be to read, understand, modify, and debug that …
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Guru: Beyond The Basics Of Code Conversion

March 19, 2018 Paul Tuohy

Today many RPG programmers are tasked with having to modernize existing programs. These programs often have long and varied history. They may be RPG IV programs or they may be RPG IV programs that were originally RPG II or RPG III programs, or any permutation or combination you can imagine. There are tools available to help us convert from fixed-form RPG to free-form RPG and, within RDi, we have options to help us reformat code and refactor variable names. But these tools can only go so far. We finally reach the point where we have to put fingers to the …
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Guru: Ready Or Not, Big Changes in RDi V9.6! Part 1, Key Behavior

February 26, 2018 Susan Gantner

Version 9.6 of RDi has many new features. If you’ve upgraded your RDi, you have undoubtedly noticed some of the enhancements, because most of the new features are enabled by default. Just in case you’re not a huge fan of some of those features, most can also be disabled to make things work as before if you know where to look.

In this series, we’ll take a look at some of the new features and how to enable and/or disable them. In this first part, we’ll study two new key behaviors and how to control them.

Many of the enhancements …
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