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Re: [eclipselink-users] Eclipselink Best Practices
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>> I've been told that using primitive ints/longs for foreign keys and using
zero as a sentinel value for NULL is the best/correct/"golden path" way to
use the product
I would not say that. In general if your database allows null for a column,
then it is best to use the primitive wrapper, so you can represent null
correctly. Substituting 0 will work, but if both 0 and null were valid
values in your application with different meaning, then a primitive would
not work.
EclipseLink fully supports using primitives and for ids will assume by
default that 0 means null (but can be configure otherwise), but representing
null correctly as null is in general better.
Scott Frazier-2 wrote:
>
> Hi,
>
> I have a question regarding best practices when using EclipseLink.
> I'm
> doing some work for a firm that uses EclipseLink heavily. I've been told
> that using primitive ints/longs for foreign keys and using zero as a
> sentinel value for NULL is the best/correct/"golden path" way to use the
> product. I had assumed, a priori, that you'd require the use of wrapper
> classes so you could represent NULL with null, etc. What is the best
> practice around this? Are there tradeoffs between the two choices that
> might not be immediately obvious to the EclipseLink newbie?
>
> Thanks in advance. I apologize if this has been covered elsewhere,
> but
> I couldn't find anything that sounded authoritative on the topic.
>
> Regards,
> S.
>
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
EclipseLink , http://www.oracle.com/technology/products/ias/toplink/
TopLink
Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink ,
http://wiki.oracle.com/page/TopLink TopLink
Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
http://www.eclipse.org/forums/index.php?t=thread&frm_id=111&S=1b00bfd151289b297688823a00683aca
EclipseLink
Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
Blog: http://java-persistence-performance.blogspot.com/ Java Persistence
Performance
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