Re: [Hibernate] RE: Hibernate

[Matt R. <ma...@ra...>]

I am using this, but in order to follow the "open session in view" pattern
(rather than opening/closing in each DAO's method) - it's necessary to open
and pass the session from my servlets -> managers -> DAOs.

Unless I'm missing something of course.

Matt

> I use a ThreadLocalSession in our DAO framework, to
> avoid this issue.
> 
> ----- Original Message ----- 
> From: "Matt Raible" <ma...@ra...>
> To: "'Jorge Basto'" <wea...@us...>
> Cc: <hib...@li...>
> Sent: Monday, March 31, 2003 1:29 PM
> Subject: [Hibernate] RE: Hibernate
> 
> > This issue (using Session in method signatures) has been raised by other
> > users.  For the time being, I don't plan on implementing a pluggable DAO
> > and I'm happy with Hibernate, so I haven't pursued the issue much.  To
> > extract this and make it more generic, it might be wiser to create a
> > Connection object that switches based on the DAO implementation.  That
> > is to say that it has a getConnection() method and a closeConnection()
> > method that does internal logic to determine what to return.  You'd have
> > to return something like Object and then cast it down the appropriate
> > type in your DAO.  Better ideas are welcome.
> > 
> > Matt
> > 
> > > -----Original Message-----
> > > From: Jorge Basto [mailto:wea...@us...] 
> > > Sent: Sunday, March 30, 2003 7:56 PM
> > > To: mr...@us...
> > > Cc: wea...@us...
> > > Subject: Hibernate
> > > 
> > > 
> > > 
> > > Hi Matt,
> > > 
> > > Sorry to bother you yet again but I was wondering if you could 
> > > help me out with this issue I've got.
> > > After "porting" your resume-hibernate example to my 
> > > projects, I feel slightly dissatisfied with the following:
> > > That pattern is pretty much commited with hibernate, ie, the 
> > > DAO signatures take hibernate sessions and there is some 
> > > degree of hibernate "awareness" in most actions.
> > > 
> > > I tried to look around the hibernate site and also other 
> > > alternatives but it seems I cannot find a way to use hibernate 
> > > as a 100% pluggable DAO, decoupled from the controller 
> > > code.
> > > I would like the addition of hibernate to a project to leave all 
> > > the project action's code and DAO signatures unchanged 
> > > (ideally). It could maybe add a filter to the system, but no 
> > > modifications to existing code were required, except for the 
> > > actual DAO implementation.
> > > The thing is, supposing I want to change the DAO 
> > > implementation BACK to say, a XML store (for some stupid 
> > > reason ). I can ignore the hibernate session arguments of the 
> > > DAO signatures but I would nonetheless have to carry some 
> > > hibernate code around even if it were not being used.
> > > 
> > > I am not yet very familiar with hibernate-speak so it makes it 
> > > even harder for me to work around this issue.
> > > Would you have any suggestions/recommendations/links you 
> > > could give me?
> > > 
> > > Thanks
> > > jorge
> > > 
> > 
> > 
> > 
> > 
> > -------------------------------------------------------
> > This SF.net email is sponsored by:
> > The Definitive IT and Networking Event. Be There!
> > NetWorld+Interop Las Vegas 2003 -- Register today!
> > http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en
> > _______________________________________________
> > hibernate-devel mailing list
> > hib...@li...
> > https://lists.sourceforge.net/lists/listinfo/hibernate-devel


-- Matt Raible, Raible Designs, Morrison CO US
-- Tel: +1 303 979-5340
-- Mob: +1 720 560-8460
-- Fax: +1 508 256-6471
-- Web: http://www.raibledesigns.com