Lazy fetching in hibernate

Question

class A{
    private List<B> bs;
}

class B{
    private String fieldA;
    @Basic(fetch = FetchType.LAZY)
    private String fieldB;
}

when I do :

from A

It also returns fieldB data which I have initialized lazy. Why this is happening? Have I done anything wrong?

Lazy fetching works in associations like OneToMany mapping or ManyToMany mapping. So when you fetch A, list of B's is fetched and it will fetch all instance fields in B — Arkantos
– Arkantos, Commented Mar 19, 2015 at 17:15
@singhakash Can you plz tell me how can I detach an in Query?Is not there any other way? — xyz
– xyz, Commented Mar 19, 2015 at 17:33

singhakash · Accepted Answer · 2015-03-19 17:51:52Z

1

LAZY in JPA (unlike EAGER) is merely a hint, which JPA implementations may ignore.

ObjectDB always loads basic fields eagerly, regardless of the LAZY / EAGER setting.

If you have very large strings that you want to load lazily - keep them in separate entity objects. For example, you can define an entity class, LargeString, with a single String field, setting references to LargeString as LAZY.

Alternatively, you can use queries to retrieve only selected fields. But still keeping the large strings in separate entities may be more efficient, if usually these strings are not required.

Source1,Source2

answered Mar 19, 2015 at 17:51

singhakash

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1 Comment

xyz Over a year ago

After having you Source2 Link ,and scroll down to check the post commented on 2012-02-02 17:36,it says even after modifing the classes you can load the entity.How can we resolve this situation?

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