Adrian von Bidder wrote: > On Friday 22 May 2009 23.00:05 Werner F. Bruhin wrote: > >> What do you want to do with the autoincrement column? Often these are >> used for primary keys, which in turn get used as foreign keys. >> > > I want to use the id as filename; the table will cache some info that comes > from the file. Using it as a filename directly has several advantages: > * I don't have to care about a unique filename, since the db already takes > care of that. > * I don't have to create an additional column with the filename. > > Obviously, I can just first create the file with a temp filename, but I'd > like to avoid this additional step if it's possible. Less code == fewer > bugs. And I hoped that using the id from the beginning would be easily > possible. > I have a similar use case (for images and xml files), I use the wine name and vintage (easier for the user if ever they look for a particular image in the file system and want to use it outside my app) and primary key (just to make sure that it is unique), but in my case I can do it after having flush'ed. > Right now, I'm undecided if I should just drop portability and fetch the > next value from the mytable_id_seq that postgres has generated for me with > the autoincrement columns (from what I understand, even if I declare the > column autoincrement, if I set the id manually it will Just Work(tm) like it > should Based on Michael's post you can keep partial portability by manually getting it using the Sequence.
I was intriged and wanted to figure out how to get at the sequence defined in the model. Is the following really the only way to get at it? I am using ORM/declarative. seq = sa.Sequence(l.__table__.c.langid.default.name) nextid = engine.execute(seq) Werner --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
