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Retrieve object and dependencies with only one SQL request [message #1173204]

Wed, 06 November 2013 06:09

Eclipse User

Hi,

When I retrieve only one object, several sql requests are sent by EclipseLink.
There are one parametrized request by object which depends on my main object.

Can I configure EclipseLink in order to generate only one sql query when I retrieve an object and its dependencies ?

Kind regards.

Re: Retrieve object and dependencies with only one SQL request [message #1173841 is a reply to message #1173204]

Wed, 06 November 2013 14:54

Eclipse User

Yes. EclipseLink will issue the query to bring in the requested object, and if it is not in the cache already, will build it based on your mappings. Depending on how those mappings are configured, it may take queries to other tables to bring in referenced objects. You can configure your mappings to use joining or batch reading to fetch those related objects, or more commonly, use indirection so that they are only fetched when accessed. See http://wiki.eclipse.org/Optimizing_the_EclipseLink_Application_%28ELUG%29#How_to_Use_Batch_and_Join_Reading_for_Optimization for optimizations that can be used.

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