Re: Are level checks still useful?

[Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>]

This is an internally-described or program-described file technique - 
you specify record length and key length in the F-spec - probably the 
key has to be in position 1 of the record.

As I just replied to Mark W., this was a very narrow requirement posted 
there.

If types or sizes change beyond certain lengths, I suspect there is no 
need to recompile. But the assumption here was that the key would never 
change, seems to me.

Lots of assuming - and we know about that!

Still, an interesting discussion.

Vern

On 11/7/2012 12:19 PM, Alan Campin wrote:
> What happens if you change type or size?
>
>
> On Wed, Nov 7, 2012 at 11:15 AM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:
>
> > > PHP/MYSQL people scratch there head (more like point fingers at
> > > me and snicker) when we struggle with level check.
> > There was a tip on Linkedin last night for people who are struggling with
> > file level checks. It seemed to be worth considering, so I wrote a small
> > program to test the idea. This is a program that performs setll, read,
> > write, update, and delete operations against a table:
> >
> > http://www.radile.com/rdweb/temp/rla110.txt
> >
> >
> > With this structure, no file level checks are reported at runtime even
> > though the file is defined with LVLCHK(*YES), new fields have been added,
> > using alter table, the program was NOT recompiled, and it seems to run
> > flawlessly.
> >
> > Thoughts?
> >
> > Record layouts and key layouts are externally defined, too. Nice!
> >
> > -Nathan
> >
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