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Populating Entity with selected collection fields only (JPA)

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jukvii

Post subject: Populating Entity with selected collection fields only (JPA)

Posted: Thu Apr 09, 2009 3:47 am

Newbie

Joined: Thu Apr 09, 2009 2:01 am
Posts: 2

Hibernate version: 3.2.4.sp1 with JPA

Hi,

Example entity contains fields:

Code:

class Example {
private long id;
private String name;
private List<OtherEntity> list1;
private List<OtherEntity> list2;
private List<AnotherEntity> list3;

I want to create query like this:

Code:

List<Example> list = entityManager.createQuery("Select e From Entity");

But I like to have only name, and list1 fields populated. What is the best way to do that?

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snorbicet

Post subject:

Posted: Thu Apr 09, 2009 4:44 am

Newbie

Joined: Tue Feb 05, 2008 11:35 am
Posts: 10

An idea (maybe not working :)

- create a constructor

Code:

Example(String name, List<OtherEntity> list1)

- modify the query to something like

Code:

select new Example(e.name, list1) from Example e join e.list1 as list1

Note that the returned Example instances will not be persistent, so probably it is not a good strategy to use your entities like this, maybe it would be better to create custom javabeans!

--
Norbi

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jukvii

Post subject:

Posted: Thu Apr 16, 2009 1:06 am

Newbie

Joined: Thu Apr 09, 2009 2:01 am
Posts: 2

snorbicet wrote:

An idea (maybe not working :)

- create a constructor

Code:

Example(String name, List<OtherEntity> list1)

- modify the query to something like

Code:

select new Example(e.name, list1) from Example e join e.list1 as list1

--
Norbi

Hi,

I tried that but without success. I think this is an important issue on cases where lots of data and lots of fields. Is there any means to do column filtering.

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