CrudRepository and Hibernate: save(List<S>) vs save(Entity) in transaction
From SimpleJpaRepository
:
@Transactional
public <S extends T> List<S> More save(Iterable<S> entities) {
List<S> result = new ArrayList<S>();
if (entities == null) {
return result;
}
for (S entity : entities) {
result.add(save(entity));
}
return result;
}
So, your second business method only shadows save(Iterable<S> entities)
Crud Repository method, in the sense that it iterates the list and calls save(S)
on your behalf.
As long as transaction is demarcated from your processData
business method, there is no really a difference in performance or queries executed.
As what has been mentioned by Ori Dar, there is no really a difference.
However, there is one thing you should notice:the method used to a save a list of elements has been renamed into <S extends T> List<S> saveAll(Iterable<S> entities)
in 2.2.0.M1 according to the repo history, and the save
method no longer takes as argument a list.
Since I don't have 50 reputation to comment the answer or question above, I have to write a new answer about this change.
For SpringData Jpa, a cleaner approach will be to use repository.saveAll
instead of a for
loop with repository.save
. saveAll
will automatically iterate through the list and save it.
saveAll
is a part of JpaRepository, so no need to define any method.