You could also open a transaction and
SELECT FOR UPDATE.
So a second transaction can't Select the same data for update. That works fine. (You can try in with pgsql too).
Daniel
Philippe Lang schrieb:
Hi,
I've been testing Delphi 2005 with Postgresql 7.4.5, through ZEOS Lib 6.5.1, and I have a question:
How do you implement an optimistic locking strategy with these tools? With an Access front-end, and the ODBC driver, this is completely transparent. A test showed me that the Delphi client writes to the database without worrying about another user doing that meanwhile...
I saw it's possible to manipulate the isolation level (read commited or serializable only) in the ZEOS controls, but it does not help at all here. An optimistic lock is a kind of "long transaction" for me.
Thanks for your time!
Philippe
-----Message d'origine----- De : pgsql-general-owner@xxxxxxxxxxxxxx [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] De la part de Arthur Hoogervorst Envoyé : lundi, 9. mai 2005 12:46 À : pgsql-general@xxxxxxxxxxxxxx Objet : Re: Adventures in Quest for GUI RAD
Hi,
The company I work for actually uses the Zeos lib/Postgres extensively to track the shipping and sales side for almost 3 years.
We're still running on a 7.2/7.4 Postgres database, because I haven't been convinced yet to either update or upgrade to 8.x.x. I'm curious if others have successfully moved their (production) database successfully to Postgres 8.0.
Regards,
Arthur
On 5/9/05, Philippe Lang <philippe.lang@xxxxxxxxxxxxxx> wrote:
Hi,
I'm testing Delphi 2005 at the moment, with ZEOS Lib (libpq), and I have to say it work fine, as Tony mentioned. I have a few questions:
1) I'm curious: are there a lot of big projects using ZEOS with PG or is that technology still relatively new? I would like to use it a replacement for ODBC, but I have no experience regarding its stability.
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