Adrian Klaver wrote:
On Thursday 24 December 2009 11:20:35 am Mark Morgan Lloyd wrote:
I was hoping to finally get the servers updated from 8.2 to 8.4 over the
festive season, but by now I think I've left things too tight.
Is it necessary to update the (Windows) ODBC driver as well? I've got a
couple of app servers still on NT4 with ODBC 8.02.0100 which I'm trying
to be careful with lest I put something on them which requires a later
OS and can't back out.
The apps are written in a rather old version of Delphi with BDE which is
fine with 8.2. Trying to run against 8.4 I get "Couldn't perform the
edit because another user changed the record."- looking back through
this and other MLs I see suggestion that this could be caused by an
excessive number of decimal places in the data (current case only
contains integers, timestamps and text) or possibly by a transaction
isolation issue.
My experience with this is it related to timestamps with fractional second
precision. The other thing to note is that in 8.4 the default for datetimes is
now 64-bit integer datetimes, not the previous float datetimes.
Many thanks for that Adrian. I notice this in the ODBC release notes
which could be relevant:
-----8<-----
psqlODBC 08.04.0100 Release
..
8.) Remove a spurious "." with no trailing digits in timestamp
representation (bug report [#1010540] from Brian Feldman).
----->8-----
although I don't know why it didn't bite on 8.2 unless it's specifically
when 64-bit timestamps are processed.
I think that I'll try an ODBC update on a non-critical system, if that
doesn't work I'll dig into my code. The table giving problems is part of
a scheduling program where I can probably truncate timestamps, elsewhere
it might not be so convenient. I'll report back if I find anything
interesting.
The sooner I can get this code off Delphi+BDE+ODBC+Windows to
Lazarus+Linux the better.
Happy Christmas everybody, whatever country you're in and whatever your
tradition of celebration. We run 24x365 here but the caterers are hard
at work :-)
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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