Ames Andreas (MPA/DF) wrote at 2004-4-22 11:07 +0200: > ... >The ODBC api is object-based and exhibits four object types: >environment, connection, statement and descriptor objects each of >which has a set of methods and properties. Pickle-wise I'm not so >concerned about persistence across shutdown/restart cycles (I think >it's reasonable to re-create your ODBC environments, connections >etc. after restart) but rather about consistency across ZEO-instances.
You mean ZEO client instances not ZEO (server) instances, don't you? Why do you think your ODBC objects should be consistent across ZEO clients? I do not think that it is necessary as all your requests your be independent which means all transactions inside a single request which implied that connections need not to be shared. >My lack of experience makes me ask here for expert advise. > >1) Does the ZEO scenario demand some pickle support, e. g. to > use consitent environments/connections etc. across ZEO instances > or do I just misunderstand ZEO? You probably misunderstand ZEO. ZEO is a storage server that stores persistent objects (as pickles). "Persistent" means "persistence across shutdown/restart". Any object stored by ZEO must be picklable. But, as you are not interested in "persistence across shutdown/restart" for your ODBC objects, there is probably no need to store them in ZEO. >2) If pickle support is a good idea: What scope would you find > reasonable? I. e. I can imagine that persistence of > environments/descriptors could be useful Maybe... > while persistent > connections/statements could cause more trouble than they are > worth. This is definitely true. >As you can see the whole thing isn't very clear to me and so I'd >appreciate your comments. See how (other) database adapters handle these issues... -- Dieter _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
