Today programs and systems are increasingly screen-based and interactive. Subfiles are the AS/400 tool that lets you display lists of data on the screen for user interaction. Your knowledge of subfiles will increase your marketability and prepare you to move to the next level with confidence. Essentials of Subfile Programming and Advanced Topics in RPG teaches you to design and program subfiles, offering step-by-step instructions and real-world programming exercises that build from chapter to chapter. You’ll learn to design and create subfile records; load, clear, and display subfiles; develop display-file code and RPG code for interactive file maintenance; create pop-up windows for user interaction; and support users with advanced prompting features and Help screens. The book will further help you link RPG programs and database files, including using the record format level identifier and the OVRDBF (Override with Database File) and OPNQRYF (Open Query File) comm! ands; mine the rich store of data in the file-information and program-status data structures; handle errors, including using the *PSSR subroutine, the INFSR keyword and LO indicators, error messages, and error logs; improve data integrity by using journaling and commitment control; and manage program-to-program communications, especially via the power of AS/400 data queues. Three useful appendices cover issues of programming standards and style, testing and debugging programs, and using Screen Design Aid (SDA).
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Editorial Reviews
From the Publisher
Subfiles are the AS/400 tool that lets you display lists of data on the screen for user interaction. Essentials of Subfile Programming teaches you to design and program subfiles, offering step-by-step instructions and real-world programming exercises that build from chapter to chapter. You learn to design and create subfile records; load, clear, and display subfiles; and create pop-up windows. In addition, the advanced topics help you mine the rich store of data in the file-information and program-status data structures, handle errors, improve data integrity by using journaling and commitment control, and manage program-to-program communication. An instructor’s manual is available.
About the Author
Philip J. Levinson brings his 15 years of experience as an AS/400 programmer/analyst, consultant, and programming teacher at Jefferson College to presenting the essentials of AS/400 subfile programming. He holds a bachelor’s degree in Mechanical Engineering from the University of Hartford and a master’s degree in Management from Vanderbilt University. A member of the IBM-sponsored committee that developed the certification test for AS/400 programming, Phil lives in Olivette, Missouri, with his wife and twin sons.
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Most Helpful Customer Reviews
2 of 2 people found the following review helpful:
5.0 out of 5 stars
Step by step instructions,
By A Customer
This review is from: Essentials of Subfile Programming and Advanced Topics in Rpg (Paperback)
Very practical, real life projects easy to read makes you think on your own, not retype code from the book. I have recommended this book to about six people and all of them loved it. RE to previous review You are probably in the dark about everything that concern computers, try learning DDS first and some basic RPG.
1 of 1 people found the following review helpful:
5.0 out of 5 stars
Great Book for a solid understanding of Subfiles,
This review is from: Essentials of Subfile Programming and Advanced Topics in Rpg (Paperback)
I read this book a couple of years ago and I really enjoyed it. I thought that it was very easy to understand and that it taught in a very systematic approach. I worked through all of the exercises(in RPGIV) and felt they were great! I liked how for the first few chapters he gives you every bit of code and then after a while he challenges you by giving you the concept and some snippets of code, and then sends you off to make modifications to you project. It's also set up just like a textbook. Great Book!
1 of 1 people found the following review helpful:
3.0 out of 5 stars
More then a start,
By Johan van der Meer (Almere, The Netherlands) - See all my reviews
This review is from: Essentials of Subfile Programming and Advanced Topics in Rpg (Paperback)
If you heard a lot about subfiles, you have some experience in AS/400 programming but never done it form scratch, this book will be a real help. You will learn the basic techniques and how to build your own way through. The stile is school like. No black holes, every new things fully covered. The state of art? Up to you!
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