CODEWITHSUNDEEP
javajpaspring-data-jpa
Rockman12352
Rockman12352

Reputation: 111

JpaRepository saves more than one entity

tnxRepository is extending JpaRepository, why both entities are getting saved when I am only saving one? CrudRepository only saves the target one.

Tnx tnx = tnxRepository.findById(id);
tnx.txt = txt;
Tnx tnx2 = tnxRepository.findById(2);
tnx2.txt = txt;
tnxRepository.save(tnx);

Upvotes: 1

Views: 2595

Answers (3)

Ayush28
Ayush28

Reputation: 379

JpaRepository ties your repositories to JPA persistence technology, hence on save(), both the objects get persisted. Also, JpaRepository extends CrudRepository, so it provides all the functionalities offered by CrudRepository and more.

CrudRepository is a base interface that provides CRUD operations. Hence, not all the objects get persisted,but only the one you saved.

Upvotes: 2

Hantsy
Hantsy

Reputation: 9261

See saveAll method.

eg.

Tnx tnx = tnxRepository.findById(id);
tnx.txt = txt;
Tnx tnx2 = tnxRepository.findById(2);
tnx2.txt = txt;
tnxRepository.saveAll(List.of(tnx, tnx2))

Upvotes: 0

Eklavya
Eklavya

Reputation: 18430

Because for persistent entities hibernate automatically detect change of it and update the database. Even if you don't save last one both entity will updated.

Upvotes: 2

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