Re: [eclipselink-users] Mapping Question

[christopher delahunt <christopher.delahunt@xxxxxxxxxx>]

Hi Roger,

Is there a relationship between a child and its parent?  Most of the 
time, a parent will have a OneToMany with a child, and the child will 
have a ManyToOne relationship back.  Mark the @ManyToOne relationship as 
lazy - as well as all other relationships that you might not want to 
always load. 

Best Regards,
Chris

Roger wrote:
> On Thursday 24 September 2009 19:57:58 christopher delahunt wrote:
>
>   
> > Other than increasing the memory and the heap, you can make some of the
> > backward relationships also lazy - specifically the ManyToOne back
> > pointers.  This will prevent the entire tree from being inadvertently
> > brought into memory when not needed.  
> >     
>
> Is there a different annotation needed on the @OneToMany backpointer as I have 
> already tried that. and EclipseLInk still walked back up the tree.
>
>   
> > You can also look at where a
> > relationship is not strictly needed and unmap them - bringing them in
> > using a query instead when they are needed.  For instance, in a
> > ManyToMany, it may not be necessary to have both sides mapped if the
> > application will only ever us it from one side.
> >
> >     
>
> That looks like the quickest solution. I will try that in the morning 
> temporarily to get my job done, but I would like to get to the bottom of 
> what's going on and to be able to have some degree of control over back-
> walking - if it's possible.
>
> Regards
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