On Nov 7, 2007, at 10:23 AM, Werner F. Bruhin wrote:
> > How can I define a column in the table as read-only? > > I have some "computed by" columns, e.g.: > consumedvalue computed by (quantity*unitprice) > > These columns can not be updated, otherwise I get the following > exception: > ProgrammingError: (ProgrammingError) (-151, 'isc_dsql_prepare: \n > attempted update of read-only column') > read-only behavior is a class-level thing, so something like this: class MyClass(object): def mycol(self): return self._mycol mycol = property(mycol) mapper(MyClass, mytable, properties={ '_mycol':mytable.c.mycol, 'mycol':synonym('_mycol') }) Theres a ticket in trac which will make the above configuration slightly less verbose in a future release. --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---