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Essentials of Subfile Programming and Advanced Topics in Rpg IV |  | Author: Phil Levinson
Publisher: 29th Street Press
Category: Book
List Price: $45.00
Buy Used: $7.38
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Seller: Select_Entertainment
Rating:  1 reviews
Sales Rank: 1621940
Media: Paperback
Edition: 293
Pages: 293
Number Of Items: 1
Shipping Weight (lbs): 1.4
Dimensions (in): 10.1 x 8.4 x 0.7
ISBN: 158304051X
Dewey Decimal Number: 005.242
EAN: 9781583040515
ASIN: 158304051X
Publication Date: September 1999
Availability: Usually ships in 1-2 business days
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Product Description
Many courses for AS/400 programmers stop short of teaching you subfile programming. Subfiles are the AS/400 tool that supports displaying lists of data on the screen, and in today's increasingly screen-based world, you must understand and be able to use them. In fact, every list that you have seen the AS/400 display has been created using the same programming techniques that you will learn in these chapters. This text introduces you to subfiles and leads you through the process of creating and debugging subfile programs. As new subfile concepts are presented, you will develop and expand the same programs to meet expanded specifications. This approach mirrors the real world in which new specifications continually add to the complexity of interactive programs. You will program interactive displays that help users find the data they need and update records as required. You will learn several techniques for designing screens that help make user displays intuitive and easy to use. In a later chapter, you'll learn to use two tools — journaling and commitment control — that will protect your database's integrity when programs let records be changed. The two ongoing sets of exercises in this text take you through the process of developing an inventory display screen and a purchase order line display screen with data maintenance capabilities. To get the most from this book, work through all segments of the continued exercises, as well as through the additional bookstore order system project that follows Chapters 5 and 7. Chapters 8 and 9 introduce Integrated Language Environment (ILE) tools for RPG. These include bound calls, multiple modules in a program, creating and using service programs, using procedures, and prototyping. Other advanced topics include using such file-oriented elements as record format level identifiers, the OVRDBF (Override with Database File) and OPNQRYF(Open Query File) CL commands, file and record locks, and file security; mining the file-information and program-status data structures for information; handling errors via the *PSSR subroutine, the INFSR keyword, and the Input/Output operation error indicator; and using data queues for program-to-program communication. Don't neglect the appendices! Appendix A explores the programming standards you'll meet in most IS departments and takes you beyond them into issues of programming style. Appendix B introduces debugging tools and techniques to support your programming skills. Finally, Appendix C gives you invaluable training in using Screen Design Aid (SDA). When you interview for a job as an AS/400 programmer, you will be asked about your knowledge of subfiles and other advanced RPG topics. Once you complete this text, its exercises, and the additional bookstore order system project, you'll have a head start on your first programming position or — if you're already a programmer — additional professional development that will count in your department and your company.
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| Customer Reviews:
Subfile Review January 23, 2001
Jill Zimmermann (St. Louis, MO USA)
4 out of 5 found this review helpful
I used Phil Levinson's book after graduating with an As/400 degree. The subfile book is essential, and unique. It is the only on of it's kind to go into such detail about subfiles. The examples are easy to understand. The entire book and exercises takes you step by step so you can follow and learn. I would recomend this book to anyone who is new at using subfiles.
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