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).

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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Essentials of Subfile Programming and Advanced Topics in RPG/400

Levinson, Phil; Levinson, Philip J.; Leninson, Phil

Used - Soft cover

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