patrick wrote: > Hey, > I'm trying to create dynamic defaults for columns ala "http:// > www.sqlalchemy.org/docs/metadata.html#context-sensitive-default-functions". > MySQL has COMPRESS and UNCOMPRESS functions that I'm trying to > leverage. I don't want to compress with python's zlib because I have > legacy tables that were compressed using MySQL (which has a weird non- > standard zip header and body), and I need to interface with them. > Anyway, during an insert or update, I want to grab the 'text' variable > from the instance object and insert it into the database like: > COMPRESS("the text value"). Obviously context.current_parameters is > not the appropriate object, but I can't figure out if it's possible to > access the instance being inserted/updated.
are you trying to create a *default* value for an INSERT/UPDATE when NULL would otherwise be passed, or are you trying to run all incoming/outgoing data through a SQL function ? those are two completely separate topics. > > def compress_text(context): > return "COMPRESS('%s')" % context.current_parameters['text'] > > class Tree(BaseStruct, Base): > __tablename__ = 'tree' > __table_args__ = ( > {'autoload':True} > ) > > compressed = > deferred(Column(Binary(),default=compress_text,default=compress_text,onupdate=compress_text)) > text = > column_property(select(["UNCOMPRESS(compressed)"]),deferred=True) > > Is this possible with 0.5.7? > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@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. > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@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.