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From "Michael Gentry" <>
Subject Re: Hook in the cayenne internals
Date Mon, 02 Apr 2007 13:08:44 GMT
I've used extended types to implement enumerations (essentially -- but mine
had a lot more oomph behind it), but these were all integer/string values,
not blobs.  My implementation of that is on the Cayenne Wiki, but I wrote it
for Java 1.4 and a co-worker had trouble with it working under Java 1.5, but
I haven't explored it yet.  I'm not sure if it would help you, but it might
be worth looking at (since the code shows how to read/write the types -- do
the translation).


PS. Wiki link:

On 4/2/07, jerome moliere <> wrote:
> Hi all,
> I'd like to show on a simple test the Cayenne equivalent for the Hibernate
> UserType, that is to say
> a way to map some SQL types with some user provided code...
> Example given is : my customers use sybase image type to store XML gzipped
> huge files...
> I'd like to be able to be able to store/read the XML transparently...Image
> type is a detail of implementation
> org.apache.cayenne.access.types.ExtendedType
> seems to be the Cayenne solution but there are no big details on this
> subject...
> Is the Cayenne source code my only source ?
> Moreover if you have UML sequence diagrams and other conception documents
> on
> Cayenne, I'd very happy to read them..
> Cheers
> Jerome
> --
> Jerome Moliere - Mentor/J
> auteur Eyrolles

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