Re: Update a particular record in a sequential file -- RPG400-L

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Subject: Re: Update a particular record in a sequential file
From: Alan C <steelville@xxxxxxxxxxx>
Date: Thu, 28 Apr 2005 22:21:03 -0400
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You can also "simulate" an "unkeyed logical over the file" by defining a full-procedural file in the F-specs with a name different from the physical file, but override the name to the physical file both at compile and then run time.

F filename      I F E   DISK
F filename1    I F E    DISK rename ( pfrecord : pfrecord1 )
                                           usropn

Then call QCMDEXC to override it, or if you're on V5R3 or maybe V5R2 I think you can define the override on the F-specs keywords. (Right?)

Then open it and off you go.

- Alan

This is stupid, but you could create an unkeyed logical over the file, read from it or the physical till you find the record you want, then chain to the other by rrn and do the update. If you use SQL it's either going to create an index or go through the file sequentially. The O/S chooses for you. An important thing to realize is that blocked sequential reads to a file go very fast. If there are fewer than a million records in the file it's darned quick.

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Follow-Ups:

RE: Update a particular record in a sequential file , Francis Lapeyre

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