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Re: InstantDB: Will InstantDb support JDO?


Peter Hearty wrote:

> Karl
>
> I haven't been following the progress of JDO too closely. Does the reference
> implementation exist yet? Provided this, or an open source alternative
> relies only on just JDBC/SQL then I don't see why not. If an implementation
> depends on support for structured data types though then InstantDB will
> require some work.

I just interviewed a fellow who is on the JDO expert group and he said there is
a reference implementation. But he of course has access to the latest and
greatest. I could not find any mention of it at Sun's developer site. So I think
it is about to come out. I understand that it relies on JDBC/SQL completely. I
have a use right now making  Hashtable persistent, which would enable
java.bean.beancontext to be persistent, which I am using.  I was wondering if
anyone else with InstantDB was aware of this work and could shed some light.
JDO will really help with scaling for collections, etc ..

-karl

>
>
> Regards
>
> Pete
>
> --
>
> Peter Hearty                         peter.hearty@lutris.com
> Lutris Technologies (UK)        http://www.lutris.com
> ----- Original Message -----
> From: "Karl Thiele" <karl.thiele@ind.alcatel.com>
> To: <instantDB@enhydra.org>
> Sent: Friday, November 17, 2000 10:02 PM
> Subject: InstantDB: Will InstantDb support JDO?
>
> > Will instantDB support JDO?  I am expecting a reference implementation
> > to surface. Then I was wondering if any instantDB folks where involved
> > in any manner with JDO.
> >
> >
> >
> > Java Data Objects
> >
> >                    The JDO specification provides for interface-based
> > definitions of data stores
> >                    and transactions; and selection and transformation of
> > persistent storage data
> >                    into native JavaTM programming language objects.
> >
> > Existing Specifications:
> >
> >                    Existing specifications for persistence include JDBC,
> > SQLJ, and
> >                    java.util.Serializable.  The JDBC and SQLJ mechanisms
> > provide for query,
> >                    transactions, and large capacity storage, but require
> > that users learn another
> >                    language (SQL).  This proposal allows users to
> > specify their application
> >                    program logic, including queries, entirely in Java,
> > and express the mapping, if
> >                    any, to the database with a separate mechanism. The
> > java.util serialization
> >                    protocol provides for persistence, but it does not
> > offer query capability,
> >                    transactional behavior, nor large capacity data
> > storage. In addition, both the
> >                    serialization and SQL APIs require that the
> > programmer explicitly fetch and
> >                    store Java objects from a database; we propose
> > transparent persistence, doing
> >                    this automatically.
> >
> >
> > http://java.sun.com/aboutJava/communityprocess/jsr/jsr_012_dataobj.html
> >
> >
> > Appreciate any comments,
> >
> > -karl
> >
>
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