Hi Patrick,
I have two classes. I stripped the accessors and mutators to shrink
them a bit (I am unsure if attachments get stripped or not).
@Entity
@Table(name="SHAPE")
public class Shape
{
@Column(name="shape_id")
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
@Column( name="type_id" )
private ShapeTypes type;
@OneToOne( mappedBy="parent", cascade=CascadeType.ALL,
fetch=FetchType.EAGER )
private Attachment attachment;
}
@Entity
@Table( name="attach" )
public class Attachment
{
@Id
@GeneratedValue( strategy=GenerationType.IDENTITY )
@Column( name="attach_id" )
private int id;
@OneToOne( cascade=CascadeType.ALL, fetch=FetchType.LAZY )
@Column( name="shape_id" )
private Shape parent;
private String value;
}
When I use the find() method, I see the following selects:
SELECT t0.SHAPE_ID FROM SHAPE t0 WHERE t0.SHAPE_ID = ? [params=(int) 16]
SELECT t0.ATTACH_ID, t0.SHAPE_ID, t0.VALUE FROM ATTACH t0 WHERE
t0.SHAPE_ID = ? [params=(int) 16]
When I use a JPQL query, I get the following select:
SELECT t0.SHAPE_ID, t1.ATTACH_ID, t1.SHAPE_ID, t1.VALUE FROM SHAPE t0
LEFT OUTER JOIN ATTACH t1 ON t0.SHAPE_ID = t1.SHAPE_ID WHERE
(t0.SHAPE_ID = ?) [params=(int) 16]
Playing around a bit with those classes, I found that if I mark
attribute Shape.type as EAGER, both techniques produce only one select
statement...
Thanks,
Christian
On 7/24/07, Patrick Linskey <[EMAIL PROTECTED]> wrote:
Can you post the selects that you're seeing and the domain model?
Thanks,
-Patrick
On 7/24/07, Christian Defoy <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I just noticed that if I call entityManager.find() to retrieve an
> object, many select statements (one per relation) are generated even
> though the relations are marked as FetchType.EAGER.
>
> If I use a JPQL query instead, only one select statement is generated.
> The JPQL looks like this: "SELECT s FROM Shape s WHERE s.id = :id"
>
> Is that normal? Is there some configuration property that I can change?
>
> Thanks in advance!
>
> Christian
>
--
Patrick Linskey
202 669 5907
