Re: [eclipselink-users] [EL 2.3.0] QueryHints.REFRESH ignores CascadePol

[Tom Ware <tom.ware@xxxxxxxxxx>]

Hi Michael,

  If EclipseLink is refreshing objects that are not yet loaded, that is a bug. 
 Please have a look at this bug.  It may be related to your problem.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=347190

-Tom

Michael Simons wrote:
> Hello,
>
>  
>
> I noticed, that with EclipseLink 2.3.0 (or 2.2.0) the behavior of 
> QueryHints.REFRESH has changed.
>
> It seems, that not only the objects from the query will be refreshed 
> now, but also all cascading references within that objects,
>
> even if these objects haven’t been loaded yet.
>
>  
>
> In some cases, I don't want to refresh all references because that leads 
> to a high performance loss.
>
> I tried to use QueryHints.REFRESH_CASCADE (CascadePolicy.NoCascading) 
> but this makes no difference.
>
> It still refreshes every referenced object.
>
>  
>
> Example:
>
>  
>
> Query q = getEntityManager().createQuery("SELECT x FROM DeliveryAddress x");
>
> q.setHint(QueryHints.REFRESH, "true");
>
> q.setHint(QueryHints.REFRESH_CASCADE, CascadePolicy.NoCascading);
>
>  
>
>  
>
> @Entity
>
> @Table(name = "delivery_address")
>
> public class DeliveryAddress  {
>
> ...
>
>                @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
>
>                 @JoinColumn(name = "lcation_id", unique = true, nullable 
> = false)
>
>                 private Location location = null;
>
> ...
>
> }
>
>  
>
> The query will refresh the "Location" entry too.
>
>  
>
> BTW, is there a kind of a specification for the QueryHints, that 
> describes how a query has to behave when a hint is set?
>
>  
>
> Kind Regards, Michael
>
>
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