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Is here the way to regulate result of query to child tables of an entity. [message #1011860] Wed, 20 February 2013 06:43 Go to next message
Super User is currently offline Super User
Messages: 9
Registered: January 2013
Junior Member
Greetings!

Is here way to regulate the fact is query returning data from the child tables of actual entity?

For example, if here one entity relates to another with one to many relationship, could developer to query database for first entity instances only without instances of second one?

Thank you,

[Updated on: Fri, 01 March 2013 07:55]

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Re: Is here the way to regulate result of query to child tables of an entity. [message #1014845 is a reply to message #1011860] Tue, 26 February 2013 10:17 Go to previous messageGo to next message
James Sutherland is currently offline James Sutherland
Messages: 1939
Registered: July 2009
Location: Ottawa, Canada
Senior Member

If you make the relationship LAZY, it will not be fetch until it is accessed.

EclipseLink also supports fetch groups to load partial objects.

In JPQL you can also select specific fields instead of the entire object.


James : Wiki : Book : Blog : Twitter
Re: Is here the way to regulate result of query to child tables of an entity. [message #1015628 is a reply to message #1014845] Fri, 01 March 2013 07:53 Go to previous message
Super User is currently offline Super User
Messages: 9
Registered: January 2013
Junior Member
Thank you Mr. Sutherland
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