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| FEATURED TIP |
| RPG data structure arrays better than multiple-occurrence data structures |
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by Ron Turull
In case you haven't yet heard the news, as of V5R2 ILE RPG compiler supports data structure arrays. That means you can now specify the Dim keyword on the definition of a data structure to dimension that data structure. Just as you can dimension a stand-alone field to create an array of that type of field, you can now dimension a data structure to create an array of that kind of data structure.
Why should you care about support for data structure arrays? They're much simpler to code and much less prone to bugs than multiple-occurrence data structures.
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Technical Questions Answered |
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Don't proliferate old, bad code
In an effort to hasten the completion of projects, most programmers "steal" code from other sources within their libraries. The problem is that many times, the code originated years ago and is cumbersome, lengthy and not easy to maintain. Even most ILE code resulted from old code that was passed through a conversion utility. Using the functionality of RPGIV's Keywords and Built-In-Functions usually can make the code much smaller and manageable. Search400.com member Joe Szymanski provides a couple of examples, including one involving data structure arrays.
Referencing a subfile of an array
"JFuchs" is using a data structure as an array and want sto use one of the subfiles of the data structure in an Eval statement. The problem is he doesn't know how to reference this. Not to worry -- Nick Hobson was on hand with some advice.
"CLEAR" advantage over resetting work fields
Site expert John Kohan illustrates how to use the "CLEAR" operation code to clear the fields in a a single-occurrence data structure or multiple-occurrence data structures.
Pass larger amounts of data between programs
When using separate programs to retrieve and display data, Search400.com member Tim Cervenec says to use use arrays or multiple-occurrence data structures to pass back larger amounts of data strings.
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BOOK EXCERPT
The Modern RPG IV Language, Third Edition
Log on and download for free Chapter 3 of The Modern RPG IV
Language, Third Edition, written by Bob Cozzi and published by MC
Press.
This chapter focuses on support for expressions in RPG IV. Learn
how you can extend normal conditional logic, keyword support and calculations through the user of natural expressions.
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