Re: [Springframework-developer] JdoDialect and detach?

[Juergen H. <ju...@in...>]

We did consider supporting attach/detach hooks as well, but decided not to
do so, because the exact syntax and behavior of those operations weren't
clear back then. In contrast to that, almost all JDO 1.0 implementations had
JDBC Connection exposure and flushing for ages.

At this point of time, our plan is to not extend JdoDialect any further,
because JDO 2.0 is just around the corner. Our JdoTemplate and
DefaultJdoDialect already support the standard JDO 2.0 API, so once you get
a JDO impl that supports JDO 2.0, that's gonna be immediately available to
you.

For JDO 2.0 previews such as current Kodo versions, you can always implement
a JdoCallback and cast the passed-in PersistenceManager to the
vendor-specific PM interface, calling attach/detach and other JDO 2.0
preview operations there. This can of course be replaced with straight
JdoTemplate calls once the particular JDO impl officially supports the
standard JDO 2.0 API.

As a side note: The pluggable JDBC Connection exposure in JdoDialect can
still be valuable even with JDO 2.0. For example, you might want to expose
the native JDBC Connection to JDBC data access code, which could be casted
to OracleConnection or the like. In this case, you still need
vendor-specific extraction calls, because standard JDO 2.0 always exposes a
wrapped handle...

Juergen


-----Original Message-----
From: spr...@li...
[mailto:spr...@li...]On Behalf
Of Marc Logemann
Sent: Thursday, June 16, 2005 10:56 PM
To: spr...@li...
Subject: [Springframework-developer] JdoDialect and detach?


Hi,

forget something in my last email a few minutes ago. JdoDialect only
handles vendor differences regarding JdbcConnection obtaining, it would
be nice to have the same for attach/detach APIs. This is of course
non-existant when we all have JDO2, but the same goes for the JDBC
connection issue.

Or is this allready handled somewhere else? Have not found something yet.


--
regards
Marc Logemann
[blog] http://www.logemann.org
[busn] http://www.logentis.de



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