Re: Null maps, anybody?

excuse me, but please explain me
How I may use null maps? What is it?
I don't understand how write 24-byte structure into
20 byte record (The mistake will be, will not it?).
Sincerely, Andrew.


>From: Gene_Gaunt@ReviewWorks.com
>Reply-To: mi400@midrange.com
>To: mi400@midrange.com
>Subject: Re: [MI400] Null maps, anybody?
>Date: Fri, 2 Nov 2001 11:52:45 -0500
>
>
>I assume the question is, how can MI set null maps in database fields using
>the QDB* APIs?
>
>Here is how to do that.  In the UFCB byte at decimal offset 188 (i.e.
>POS(189)), turn on bit 6 (i.e. X"02").   Then you can append a null map
>after each record as you write them.  For example, for a 20-byte record
>with 4 fields, fill the final 4 bytes in the 24-byte output buffer with
>ones and zeroes.
>
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