Spring Boot JPA update multiple entities at once one to many

Question

I need to update all entities which filter by ID and I could do this for single entity and it works fine but how can I do this for multiple entities.

Here is successful example for single one to one update

@Override
public FullPack updatePack(FullPack fullPack, int id) {

    FullPack newFullPack = fullPackRepository.findByPackId(id);
    newFullPack.setPackCompose(fullPack.getPackCompose());
    newFullPack.setPackSequence(fullPack.getPackPackSequence());
    FullPack savedFullPack = fullPackRepository.save(newFullPack);


    return savedFullPack;
} 

Assume that I will get multiple FullPack based on findByPackId then how can I update all

@Override
public List<FullPack> updatePack(FullPack fullPack, int id) {

    List<FullPack> newFullPack = fullPackRepository.findByPackId(id);
    //////////////////
    /////////////////
} 

How can I do this kind of scenario

Answer 1

Iterate the list with a for loop:

@Override
public List<FullPack> updatePack(FullPack fullPack, int id) {

    List<FullPack> newFullPackList = fullPackRepository.findByPackId(id);
   
    for (FullPack newFullPack : newFullPackList) {
        newFullPack.setPackCompose(fullPack.getPackCompose());
        newFullPack.setPackSequence(fullPack.getPackPackSequence());
    }

    fullPackRepository.saveAll(newFullPackList);
    
    return newFullPackList;

}

Answer 2

With JPA, most, in not all Repository interfaces exposes a .saveAll() method that opens a path for you to save a collection.

You can simply save multiple FullPack like so.

@Override
public List<FullPack> updatePack(FullPack fullPack, int id) {

    List<FullPack> newFullPack = fullPackRepository.findByPackId(id);
    ...
    fullPackRepository.saveAll(newFullPack)
} 

Answer 3

you can do it with a Repository

@Query("update OrdineMacchina o set o.durataEsecuzione = o.durataEsecuzione + :incremento where o.idOrdineMacchina = :idOrdineMacchina")
@Modifying
void updateDuration(@Param("idOrdineMacchina") Long idOrdineMacchina,@Param("incremento")  Integer incremento);

don't foreget @Modifing. You have to @autowire the repository where you need the update. You can write the query in JPQL or as a native query.