Question:
Good day,
I have a hibernate mapping which goes something like this
<class name="Person"> <id name="id" type="long" column="person_id" unsaved-value="null"> <generator class="sequence"> <param name="sequence">person_id_seq</param> </generator> </id> ... <set name="thinCollection" table="(select person_id, person_property from some_other_table where another_property = 'something')" fetch="subselect" lazy="false"> <key column="person_id"/> <element column="person_property" type="long"/> </set> ... </class> Now my problem is, when a Person object gets flushed, it tries to execute a Collection Remove Action against Person#thinCollection, which fails because it's trying to execute delete from (select person_id, person_property from some_other_table where another_property = 'something').
Thus in line with that, how do I stop Hibernate from executing such actions (as well as update and inserts) ?
Thanks
Solution:1
I believe you want to use a subselect for your query, thus rendering it readonly.
http://docs.jboss.org/hibernate/stable/core/reference/en/html/mapping.html
Solution:2
Wouldn't
cascade="none" Do the trick ? [EDIT] Oups, thought it was NHibernate :P Well, I hope it would still work :)
Solution:3
What I currently did to solve this is to create my own persister (which is a subclass of BasicCollectionPersister) which never does an insertion/update/deletion.
But I am not sure if this is the best way to go about this or if could simply just add a magic mapping attribute to prevent the insertion/update/deletion.
[EDIT]
I found it hard to map my Set to a subselect so I used my own custom BasicCollectionPersister instead. I overriden #isRowDeleteEnabled() and #isRowInsertEnabled() to both always return false. And I overriden #doUpdateRows(..) to always return 0.
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