IMO current way as of src (sorry i havent read docs at user level), u'll need two-side implementaion - one abstract SA, and one dialect-dependent. In each dialect, there are 2 mappings: one abstractSAtype->specificDialectType (look for something named colspecs), and another one used for reflection - named 'pragmanames' or ischemanames' or 'similar.
so u have to create your custom abstract type and a custom dialect type(s) and add them to those mappings - eventualy substituting with some available type where inapplicable. see in some dialect (in database/*) how a dialect-specific type is made, subclassing the abstract one. of course there might be easier "official" way... > Hello, > > apologies if I'm the obvious or important things in the > documentation - and I'm obviously very new to SQLAlchemy... > > I'd like to create my own types which are aware of different > database dialects. For example, I need a type 'Double' which holds > a representation of a double precision floating point number. With > MySQL, I would robably use the native DOUBLE type, with Oracle > BINARY_DOUBLE. I would like to encapsulate the data base dependency > with a properly defined custom type. > > Is there a straigtforward way to achieve this? I have managed to > build custom types, of course, but I haven't found a way on how to > deduce the current data base engine / dialect from the > types.TypeEngine... > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
