Optimize Spring-Data JPA queries

Question

I am looking for possible optimizations for framework-generated queries. As far as I understand, the process is the following:

• you could declare your domain

Answer 1

Take a look at JPA's lazy fetching strategy. It will allow you to select objects without their relations, but will fetch the relations when you reference them.

Answer 2

One solution is to use DTO's:

@Query("select new FilteredOrder(o.name, o.size, o.cost) from Order o where o.id = ?1")
Page<FilteredOrder> findFilteredOrderById(Pageable pageable, String id);

If you want to have entities for some reports generation maybe you should think about using nosql datastore?