| Re: [jpa-dev] [DISCUSS] Streaming queries? |
I don't quite get what the actual point of the suggested library is: that the Criteria API is hard to use? Well, that's not news. And has been worked around in stuff like Querydsl. I think introducing an alternative to the Criteria API in the spec itself is adding quite a bit of complexity. Not sure whether that's a good idea. Other than that, I found the focus on streams in the name of the library quite weird as all that's done to the Stream is a `toList()` effectively. Returning streams from JPA queries is a strange beast in the first place as they're essentially "live" objects that still need a connection to properly be traversable. Which makes them easy to use incorrectly. I.e. if you hand a `Stream` out of a transactional method, it's not actually usable as the underlying `EntityManager` has been closed. A bit of feedback on the Spring Data JPA samples in the blog post: - pretty much everything laid out in the first code samples is available in Spring Data JPA repositories OOTB. Declare a `Stream<User> findAllBy(Pageable pageable)`. Done. See [0] for details. - the Spring MVC example looks artificially convoluted as you can just declare a `Pageable` as MVC handler method parameter and then call the aforementioned method. See [1] for details. Cheers, Ollie [0] https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-streaming [1] https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#core.web.basic.paging-and-sorting > Am 08.03.2021 um 16:25 schrieb Ivar Grimstad <ivar.grimstad@xxxxxxxxxxxxxxxxxxxxxx>: > > Hi, > > Do you think it would be worthwhile pursuing something like this in a future version of the specification? > > https://blogs.oracle.com/javamagazine/jpastreamer-expressing-hibernatejpa-queries-with-java-streams > > Ivar > > -- > Ivar Grimstad > Jakarta EE Developer Advocate | Eclipse Foundation > Eclipse Foundation - Community. Code. Collaboration. > _______________________________________________ > jpa-dev mailing list > jpa-dev@xxxxxxxxxxx > To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/jpa-dev
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