Hello,
I agree with mostly of what you said...
And add a little thing...
If your domain objects & DTO implements a common interface, if your domain
object changes you'd need to change its interface, so you will be forced
To change also the DTO... I don't think you can get away with it
Unless what you are doing is to just get objects from hibernate layer and
put them straight into the page where you just use struts tags to retrieve
Properties..... then I guess I see your point.....
In my case I chooseed to have a common interface for DTO & domain, and I am
just using BeanUtils to copy Properties between the two (so I save the
hardcoded method copy)
Well, I haven't dealt with LazyInitializationException, so I don't know much
About it... but will it be a solution to copy what hibernate has returned
To a new Collection, so that you could handle the
LazyInitializationException in your hibernate layer?
Any reasons of why you can't do that?
Regards
marco
-----Original Message-----
From: Tom Ziemer [mailto:[EMAIL PROTECTED]
Sent: 30 November 2005 14:51
To: Struts Users Mailing List
Subject: Re: slightly [OT] Hibernate and domain objects in web apps
Hi,
well, I can use DTO but AFAIK, it would be a bad design decision to use
them, because it would basically mean that I have to copy all my
DOM-objects. So if there changes in the DOM, the DTOs would have to be
manually updated. Apart from that, it would mean:
Hibernate -> DAO -> Business layer -> covertDOMToDTO -> DTO -> View
and then in case of an update:
View -> DTO -> Business layer -> convertDTOtoDOM -> DAO -> update()
-> IMO, lots of trouble, an additional error risk and poorer performance.
That's why I thought, it would be prudent to avoid using DTOs.
Tom
Marco Mistroni wrote:
> Hello,
> Any reason of why you can't use DTOs?
> Your domain objects and dto could implement the same interface..
>
>
>
> HTH
> marco
>
> -----Original Message-----
> From: Tom Ziemer [mailto:[EMAIL PROTECTED]
> Sent: 30 November 2005 14:26
> To: Struts Users Mailing List
> Subject: slightly [OT] Hibernate and domain objects in web apps
>
> Hi,
>
> I have got a little problem with Hibernate - well actually it is only
> partially related to it:
>
> My app uses Spring + Hibernate (lazy loading), but should I return the
> value beans (dom) from Hibernate to my Struts actions? If I do this, I'd
> have to deal with LazyInitializationExceptions for collections that have
> been lazy-loaded. In my opinion, this would be a horrible design because
> the view would have to know about the data access tier. On the other
> hand, I've read, that "DTOs are evil" - but how can I solve this problem
> without DTOs?
>
> I am sure, lots of you are using
> Hibernate/{YOUR_LIST_OF_OTHER_GREAT_FRAMEWORKS_HERE}/Struts and I'd be
> grateful for any help.
>
> Thanks,
> Tom
>
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