[Grok-dev] ZODB and storing, retrieving, deleting, use of ID
rmoskal at mostmedia.com
Mon Oct 13 10:09:39 EDT 2008
You might try the python uuid module. I tend to use uuids for RDBMS work,
why not use them with the ZODB?
Laurence Rowe wrote:
> John de la Garza wrote:
>> I'm making an app that has polls for voting... When I make a Poll
>> object to I have to create an ID so I can find it again. I'm comming
>> froma RDBMS background and am wondering if there are any articles
>> that would helpl me transistion. For example should the ID be the
>> last object id + 1? I saw some sample code that kept the objects in
>> a list then just got the length of the list, but if items are deleted
>> then using the len as the ID could be trouble (not unique).... any
>> feed back would be apprecitated. I've read intro to ZODB (Jim
>> Fulton) but it doesn't mention deleting
> * Randomised keys have better efficiency when filling a B-Tree. You need
> to check that the randomly generated key does not already exist.
> * Store the length with a BTrees.Length.Length and increment/decrement
> as you add/delete.
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