You declare your collection attribute as java.util.List. That's fine!
But then you have to be careful:
If you *load* you collection from the db first, then OJB will automagically use a RemovalAwareCollection to fill your collection attribute.
But if you do not load the collectio from the DB you have to make sure that you initialize the collection attribute with a RemovalAwareCollection instance.
List mylist; myList = new RemovalAwareCollection();
cheers, Thomas
gong wrote:
I tried it, but it did not work. the entry still remain in the database and can be retrieved.
I used java.util.List for collection, but it fails. Is that mean i should use org.apache.ojb.broker.util.collections.RemovalAwareCollection in my java code?
----- Original Message ----- From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, December 01, 2003 10:08 PM
Subject: RemovalAwareCollection, was: RE: does
PersistenceBroker.getCollectionByQuery use the cache?
Hello Gong,
please start a new thread when you ask a new question.
-----Original Message-----
class myList and myEntry has a 1:n relationship each myList has a collection of myEntry(s)
[..]
<collection-descriptor name="entries"
collection-class= "org.apache.ojb.broker.util.collections.ManageableArrayList" element-class-ref="myEntry" auto-retrieve="true" auto-update="true" auto-delete="true" > <inverse-foreignkey field-ref="listId"/> </collection-descriptor>
</class-descriptor>
[..]
in this way, listPersisiter.store() and get() can automatically store and retrieve entry.
but when i retrieve myList, and remove an entry from myList.entries, and store back, it can not automatically delete the entry in DB which have been removed from myList.entries.
If you want this behaviour, you must not use the ManageableArrayList (as you explicitly do, see above) but have to use the RemovalAwareCollection (which is actually the default.)
Just remove the attribute collection-class from the class-descriptor and try again.
BTW: this is a FAQ.
Olli
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