Re: Data Structures for IO (Re: overlaying arrays in v5r1) -- RPG400-L

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Hi Brian -

On Wed, 22 Jan 2014 15:21:26 +0000, Brian May <bmay@xxxxxxxxxxxxxxxxx>
wrote:

Even though I have never seen it used in practice, fields in a logical files can be defined as input only by placing an "I" in position 38 of DDS. If I am not mistaken, this is the reason that DS IO was implemented in this way. This makes it possible for the input buffer and the output buffer to have different formats. When using DSs for IO, RPG moves the DS into the buffer as a whole. In this scenario, using the same DS would cause data corruption.

Various calculated fields in a logical file *have* to be declared as
input-only. For example, I have a logical file that substrings a
field into three different fields. Those three fields have to be
declared as input-only.

(Major design flaw [and major PITA] that the software vendor combined
those three pieces of information into one field to start out with,
and it's the primary key of the file.)

Ken
Opinions expressed are my own and do not necessarily represent the views
of my employer or anyone in their right mind.

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