RE: data queues and null indicators

Ok. Based on Alan's article I'll qualify my response.

IF ALL fields in the data structure are character placing x'00' in any given field should not pose a problem for the data queue.

Gary

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Campin
Sent: Thursday, September 06, 2012 3:39 PM
To: Midrange Systems Technical Discussion
Subject: Re: data queues and null indicators

You are correct. Nulls are only supported in RPG in external described tables. You must define a array of indicators to hold true or false to null.

i use qualified data structures to do this. See my document at www.think400.dk/downloads.htm on RPG and Nulls.

On Thu, Sep 6, 2012 at 1:08 PM, Thomas Garvey <tgarvey@xxxxxxxxxx> wrote:

I've been using data queues to funnel data into several programs. I
am using the typical method (I suppose) of using data structures to
define the data values in the data queue entries. This particular
data structure is externally defined.

Now I have need to be able to determine if individual field values in
the data queue entry are null. That is, the data placed there by the
originating program(s) is properly setting the field's null value
using the %nullind function.

The externally defined data structure has the fields defined as null
capable, but I'm thinking that passing the null settings for each
field is beyond the capability of data queues, no matter how you
define the data contained in them.

Has anyone else been in this situation? Short of adding an array of
flags to the end of the data structure to contain the null indicators
for each field, anybody got any ideas?


TIA,


Thomas Garvey



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