我可以在JpaRepository中将update和insert混入saveAll吗? [英] Can I mix both update and insert in saveAll from JpaRepository

问题描述

我正在使用Spring Boot和Spring Data JPA和Hibernate作为持久性提供程序.我用JPARepository扩展了我的Repository接口.我有一张表的实体Bean列表.其中一些已经存在，而另一些则不存在.

I am using Spring Boot and Spring Data JPA and Hibernate as the persistence provider. I have extended my Repository interface with JPARepository. I have a list of Entity Bean for a table. Some of them already exist and some of them not.

我想知道当我从服务层调用saveAll并传递此List时会发生什么情况?

I want to know what will happen when I call saveAll from my service layer and pass this List?

推荐答案

如果您查看SimpleJpaRepository，它是CrudRepository的常见实现，您会发现它只会为每个元素调用save:

If you look at the SimpleJpaRepository which is a common implementation of the CrudRepository you can see that it will simply invoke save for each of the elements:

@Transactional
public <S extends T> List<S> saveAll(Iterable<S> entities) {

    Assert.notNull(entities, "The given Iterable of entities not be null!");

    List<S> result = new ArrayList<S>();

    for (S entity : entities) {
        result.add(save(entity));
    }

    return result;
}

保存本身可以区分给定实体persist还是merge:

The save itself distinguishes itself whether to persist or merge the given entity:

@Transactional
public <S extends T> S save(S entity) {

    if (entityInformation.isNew(entity)) {
        em.persist(entity);
        return entity;
    } else {
        return em.merge(entity);
    }
}

因此，回答您的问题.是的，您可以在通过列表中混合使用新实体和现有实体.

So to answer your question.. yes you can mix both new and existing entities in the passes list.

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