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| How to use RPG's IMPORT and EXPORT keywords to share data across modules |
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by Ron Turull
Do you have two modules that need to use the same variable? One option is parameter passing in which that variable is passed between the modules. However, that can lead to excessive parameter passing and a decrease in CALL-operation performance. Another option: external variables. Using the RPG keywords Export and Import, you can define and declare, respectively, a particular field as external.
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Technical Questions Answered |
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Breaking down an RPG program
This user is in the process of breaking down a huge RPG program into ILE RPG. He needs to break the whole program into modules so they can make changes to one module only and then promote the changed module to production. He asks, "What areas do I need to concentrate on in terms of making the program modules independent of each other?" Search400.com expert John Brandt advises.
Global variables with EXPORT and IMPORT keywords
There are many ways to share the information between two programs, such as passing parameters, data area, data queues, etc., but there is another way to effectively and efficiently share the information -- use EXPORT and IMPORT keywords.
Define global set of variables
"EricG" asks, "Is there a way to define a global set of variables and then build them into a Local Data Structure within a specific procedure so that only that procedure sees them -- without moving data between variables?" Search400.com expert John Brandt has a couple ideas, including using the EXPORT keyword to create a module that uses the variables that he wants to make global.
Top 10 iSeries administrator tips
Keeping abreast on the latest systems management information is not an easy task. The Search400.com admin tips can help. Here's a list of the most popular tips year to date.
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