• Guru: Global Variables in Modules

  December 13, 2021 Ted Holt

  When I first learned to program computers (RPG II, COBOL 74), the only kind of variables I knew of were global variables. Any statement within a program was able to use any variable.  It was not until I started my computer science degree that I found out about local variables, which are known to only part of a program. Since that time, it has been my practice to use local variables as much as possible and global variables only when necessary.

  Ideally an RPG program, service program, module, or subprocedure would have no global variables at all, but I don’t …

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• Want to Modernize? Great! Now Get to Work

  December 8, 2021 Alex Woodie

  Application modernization has been one of the more popular topics through the course of 2021. After the initial scare of COVID-19 wore off and the pandemic wore on, many companies came to the conclusion that older applications were hobbling their ability to compete in an increasingly digital world. While it’s clear the desire for modernization in the cloud is building, what’s unclear is the extent to which that will translate into action at IBM i shops.

  The COVID-19 pandemic and economic lockdowns rewarded two groups: companies that had largely digital business plans, and those who could run their applications in …

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• Security Threats, They Are a Changin’

  November 17, 2021 Alex Woodie

  Ransomware came into 2021 like a lion, but rather than going out like a lamb, it seemed to get bigger and meaner. Even IBM i shops, which so often are protected from the wider security storm, felt the panic and sense of helplessness of having their previous data held for ransom. But early indications are that the security threat we’re talking about this time next year may be entirely different.

  It’s tough to overestimate the impact that ransomware had on American businesses and other institutions through the course of the year. We had indications that something big was unfolding a …

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• Consider Modernizing Your Approach to IBM i Security, Too

  November 10, 2021 Alex Woodie

  Many IBM i users are facing the reality that they need to modernize their IBM i applications, especially those based on monolithic blocks of fixed-format RPG. But other aspects of the IBM i experience can use some renovating too, including how organizations manage their security settings. Luckily, in the last few Technology Refreshes to IBM i, IBM has provided a slew of new SQL-based services for doing just that.

  Traditionally on IBM i, administrators had two main approaches for viewing and changing security settings. They could view and control the settings directly using commands, often automated through CL programs. Or …

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• IBM i Developer Day This Week

  November 10, 2021 Alex Woodie

  IBM i developers of all stripes are welcome to IBM i Developer Day, a free virtual event that’s scheduled to take place next Friday, November 19, at 1 p.m. ET. Organized by Liam Allan, the event will feature a heavy dose of Visual Studio Code (Allan’s favorite IDE) plus discussions hosted by IBMers on the future of IBM i and its role in the cloud.

  The world of application development is moving fast, but many IBM i pros are still stuck in the past when it comes to the tools, technologies, and techniques they use. While RPG and COBOL development …

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• Guru: Abstract Data Types and RPG

  November 8, 2021 Ted Holt

  An abstract data type (ADT) is a type of data and a set of operations defined over that type of data. Using ADTs allows a programmer to work with data in terms of functionality rather than physical representation. The ADT is the basis of object-oriented programming. Does that mean that abstract data types don’t apply to procedural languages like RPG? Not at all. Quite the contrary.

  Before I show you how you can use abstract data types in RPG-based applications, let me further illustrate abstract data types with another, non-OO object — the user profile. The user profile is a …

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• PHP Is Here To Stay: PHP 8 And Beyond

  November 1, 2021 Mike Pavlak

  In 2005, PHP ushered in the era of TRUE open source development on IBM i with version 5.3 of the language, thanks to the dedicated efforts of Zend and IBM Rochester. PHP had just gone through a major evolution and was taking the world by storm in the middle of the Version 5 phenomena.

  Many IBM i developers were rapidly wrapping their heads around this wildly popular scripting technology with code stored in IFS files and Db2 data popping up on pages running directly on IBM i. Nearly every website on the web that was not HTML had some flavor …

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• Guru: Flexible Interfaces

  November 1, 2021 Ted Holt

  The details are murky, it’s been eons ago. Probably the mid-1990’s. I was working on an AS/400 that ran a mixture of System/36 and native applications. I needed to call a program that had been written in the latest version of RPG from both S/36 RPG II and native RPG III (a.k.a. RPG/400) programs. I hope I’m remembering this correctly. It’s been so long.

  The problem I ran into was rooted in a numeric parameter. S/36 programs passed numeric parameters in zoned decimal format, whereas native RPG and CL programs used packed decimal. The called program defined the parameter as …

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• Technical Debt: The Silent Killer

  October 27, 2021 Alex Woodie

  There’s a dangerous malady afflicting companies that rely on the IBM i server to run their business applications. Left undiagnosed and untreated, it can debilitate an IT shop, rendering it unable to take advantage of new opportunities and respond to challenges. It’s called technical debt, and you or an organization you know may be suffering from it as we speak.

  Technical debt is a concept that is credited to Ward Cunningham, the American programmer and the co-author of Manifesto for Agile Software Development. “If you develop a program for a long period of time by only adding features but …

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• Guru: Quick And Handy RPG Output, Take 2

  October 25, 2021 Ted Holt

  I am pleased today to revisit a topic I wrote about just over seven and a half years ago. I do so for two reasons. First, I’ve made a slight improvement to my routine. Second, I’d like to provide more examples of this routine in action. My previous article suffered from a paucity of examples. I can’t believe I let that happen.

  I’m talking about the writeln subprocedure, a handy routine that I use to write unstructured text to a spooled file. I derived the inspiration for this routine from Pascal, a programming language I used heavily when I was …

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