Yes, I'm glad you raised this Ara, there are a couple of different
things I've been speculating about here:
(1) An isDirty() interceptor callback, to allow an application to
implement its own dirty checking algorithm
(2) A new property attribute; update="never|auto", to declare
"readonly" properties that are updated outside the application
(by a trigger, for example).
(3) A new property attribute; dirty-check="always|never" to allow
a property that isn't itself dirty-checked, but *is* updated
if other properties are dirty. (I am kinda ripping off a feature
of Castor here ;)
(4) Reintroduce dynamically generated SQL UPDATEs (which only
update dirty columns), as an option. I implemented this feature
at one stage, but the performance gains were not what you would
expect in my tests. However, it is worth having as an option.
Now, I'm not sure which of these features are good or which we
should actually add (all? some? none?) For example, (2) and (4)
seem to address similar problems, in slightly different ways.
None of these features is at all difficult to implement in the
current codebase (all are very straightforward, actually) and I
even already implemented one of them and then threw it away....
Now, people shouldn't get too excited, the performance gains to be
had by these techniques are a lot less than you might expect,
a-priori. But I can see that in certain special cases, each would
be handy to have....
comments?
Gavin
"Ara Abrahamian"
<[EMAIL PROTECTED]> To: <[EMAIL
PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: RE: [Hibernate]
saveOrUpdate()
eforge.net
24/01/03 06:59 AM
What about a isModified()? For tracking modification. Is it possible to
add a modification-tracking="true" to a <class/> and let Hibernate
decide whether an object is modified (a setter method actually changed a
property, etc) and then only update that modified object and that
specific field only?
Ara.
> -----Original Message-----
> From: [EMAIL PROTECTED]
[mailto:hibernate-devel-
> [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Thursday, January 23, 2003 12:00 PM
> To: [EMAIL PROTECTED]
> Subject: [Hibernate] saveOrUpdate()
>
> Since I seem to be spending *so* much time with problems relating
> to saveOrUpdate() functionality, I decided to provide some new
> functionality.
>
> The Hibernate2 interceptor interface now has a
>
> Boolean isUnsaved(Object)
>
> method, so that the application can use something completely
> different to unsaved-value, if it wants.
>
>
> comments?
>
>
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