Between ObjectA and ObjectB there is a One-One relationship, which is
configured as LAZY.
|
@OneToOne(mappedBy="objectA",fetch=FetchType.LAZY,cascade={CascadeType.MERGE,CascadeType.PERSIST})
@org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.ALL,org.hibernate.annotations.CascadeType.DELETE_ORPHAN
} )
| public ObjectB getB()
| {
| return b;
| }
|
When I load / find ObjectA via this finder method
| public ObjectA findA(int id)
| {
| logger.info("Find A by id");
| ObjectA objectA = manager.find(ObjectA.class, id);
| return objectA;
| }
|
I can see the following output in the log file:
anonymous wrote :
| 10:25:51,718 INFO [ServiceProviderBean] Find A by id
| 10:25:51,718 INFO [STDOUT] Hibernate: select objecta0_.id as id141_0_,
objecta0_.name as name141_0_, objecta0_.version as version141_0_ from ObjectA
objecta0_ where objecta0_.id=?
| 10:25:51,718 INFO [STDOUT] Hibernate: select objectb0_.id as id142_0_,
objectb0_.name as name142_0_, objectb0_.version as version142_0_,
objectb0_.imagedata as imagedata142_0_, objectb0_.objectA_id as objectA5_142_0_
from ObjectB objectb0_ where objectb0_.objectA_id=?
| 10:25:51,750 INFO [ObjectB] Post Load
| 10:25:51,750 INFO [STDOUT] Hibernate: select objectc0_.id as id143_0_,
objectc0_.name as name143_0_, objectc0_.version as version143_0_,
objectc0_.imagedata as imagedata143_0_, objectc0_.objectA_id as objectA5_143_0_
from ObjectC objectc0_ where objectc0_.objectA_id=?
| 10:25:51,765 INFO [ObjectC] Post Load
| 10:25:51,765 INFO [ObjectA] Post Load
|
Even though the relationship is configured as LAZY it seems that the related
objects are loaded. In this case as ObjectB contains a BLOB this is a very
expensive operation.
I understand that the specifications specify a default EAGER mapping for a
One-One relationship, but there should be the option to make it LAZY.
Yes I know that I previously complained about the same thing on One-Many
relationships.
http://jboss.org/index.html?module=bb&op=viewtopic&t=80437
That was a mistake, I had the relationship wrong. It should have been a One-One
rather then a One-Many.[/url]
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3936204#3936204
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3936204
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