Re: [smartweb-user] [Smartweb-user] Entity -IntegrityReferenceException

[rlogiacco <rlo...@us...>]

Pino Contartese wrote:
>=20
> Need a control of IntegrityReference when we try to remove an Object from
> data-base.
> Maybe the Object is referenced from another table in the database and we
> must implement a logical remove method.
>=20
Well, we actually have such a method into the Hibernate API, the only sad
thing is it's quite reverted.
When you create the Hibernate Mapping (.hbm file) you can specify the
cascading style (more on this on the official Hibernate documentation,
specifically on=20
http://www.hibernate.org/hib_docs/v3/reference/en/html_single/#example-pare=
ntchild-cascades
parent-child cascade  and=20
http://www.hibernate.org/hib_docs/v3/reference/en/html_single/#objectstate-=
transitive
transitive state ) which can allow you to manage consistency about your
objects.


Pino Contartese wrote:
>=20
> A possible solution for this problem is:
> 1) Insert IntegrityReferenceException in
> net.smartlab.web.BusinessObjectFactory in the method    remove
>  so the last user is forced to manage this Exception and to implement a
> logic while removing an Object   from DB.
> 2) Create a method isRemovible(Object o)  in the class referenced that ca=
n
> throws an  IntegrityReferenceException
> Es.: I have to remove a CommessaObject from my Db and it's just reference=
d
> from a ProgettoObject and AttivitaObject.
>=20
What I figure out from your statement is that you wish to handle this
cascading manually instead of automatically and beyond your back: am I
right?

Can I ask you why do you need to handle those things programmatically?

For the sake of speeking: do you want to delete all your Progetto and
Attivita when you delete Commessa or do you want to avoid deletion of
Commessa if there is a Progetto or Attivit=C3=A0 linked to it?

In the first case you just need to set the cascade style of your Commessa t=
o
all-delete-orphan, in the second to something more restictive like all or
something lesser.

Obviously I coul have not understood your point at all, in which case I jus=
k
ask you to explain it further...

--=20
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