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missing property FetchType.EAGER in entityManger.find ?

nimo frey
Ranch Hand

Joined: Jun 28, 2008
Posts: 580
Does JPA2 has any method something like:



So I do not need to set up all my relationships within Users-class to fetchtype.eager.



Paul Sturrock
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Joined: Apr 14, 2004
Posts: 10336

No. Its usually the exception rather than the rule to define collections to be eagerly fetched, this is because it is easy to override fetching behaviour in a specific query, but the performance overhead of always bringing back a whole object graph is not usually desirable (though this may be different in your case).

Its easy enough to write a method to do what you want though. Your DAO class could create a query by id as required which would be what I'd recommend.


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nimo frey
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Joined: Jun 28, 2008
Posts: 580
yes, I can create a query for that.

However, it would be nice to have such a feature to find-Method. Maybe in jpa3..;)

thanks.
James Sutherland
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Joined: Oct 01, 2007
Posts: 553
JPA does not, but some providers do.

With JPA you could use a JPQL query that uses join fetch to make relationships fetched.

With EclipseLink you can use a LoadGroup or FetchGroup with a query through a query hint that defines what you wish to be loaded.

TopLink : EclipseLink : Book:Java Persistence : Blog:Java Persistence Performance
 
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