Actually to add this I wrote on new how-to and found an old one: - using guid's on Windows: http://www.zope.org/Members/andym/GUID - using FSCounter: http://www.zope.org/Members/andym/FSCounter/unique_ids HTH. ----- Original Message ----- From: "Andy" <andy@agmweb.ca> To: "Joe Block" <jpb@ApesSeekingKnowledge.net>; "Zope List" <zope@zope.org> Sent: Monday, January 14, 2002 10:09 PM Subject: Re: [Zope] q: How should I get a guaranteed unique id in Zope?
Along with all the other suggestion the FSCounter product is a counter in the file system. I use this to happily generate incrementing values.
----- Original Message ----- From: "Joe Block" <jpb@ApesSeekingKnowledge.net> To: "Zope List" <zope@zope.org> Sent: Monday, January 14, 2002 6:34 PM Subject: [Zope] q: How should I get a guaranteed unique id in Zope?
I just discovered Zope a couple of weeks ago, and have started migrating a cgi based web application that I was writing in straight python to Zope both as a learning exercise and to take advantage of Zope's feature set.
My problem is, I have several sql tables that I'm storing data in that I need to be able to have the same jobid in because I'm using the jobid to match which comments are attached to which jobs. When I was using cgis, this was easy - I made a class that wrapped the following function
def makeID(self): idstring = "%s-%s.%s-%s" % (self.prefix, os.getpid(), time.time(), self.counter) self.counter = self.counter + 1 return idstring
and I could be guaranteed their uniqueness because prefix was the hostname of the server the cgi was running on, and the combination of the other 3 parts was unique per call to makeID.
Now that I'm using Zope, the pid isn't unique any more, of course. I don't want to store a counter in the database, because from some of the postings I saw in the last few days here I think it'll cause my db to grow for no reason as it stores unwanted undo information. I also haven't figured out how to lock an object while I update properties yet. I don't want to use an external file either, because the constant locking & unlocking seems likely to cause performance problems eventually.
I have both _The Zope Book_ and _Zope Web Application Development and Content Management_ , and haven't found an answer to my problem in either book as yet.
I'm running Zope 2.5.0b3 with Python 2.1.1 on Mac OS X 10.1.2
Thanks,
jpb -- Joe Block <jpb@ApesSeekingKnowledge.net>
Madness takes its toll. Please have exact change ready.
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