如何在 spring-data 中强制使用 CrudRepository 进行预加载? [英] How to force eager loading with CrudRepository in spring-data?

问题描述

我有一个包含 List 的实体，因此默认加载 lazy:

I have an entity containing a List that is thus lazy loaded by default:

interface MyEntityRepository extends CrudRepository<MyEntity, Long> {

}

@Entity
public class MyEntity {
    @Id
    private Long id;

    @OneToMany(mappedBy = "bar") //lazy by default
    private List<Bar> bars;
}

@Entity
public class Bar {
    //some more
}

问题:如何在执行 repository.findOne(id) 时强制预先加载?

Question: How can I force eager loading when executing repository.findOne(id)?

推荐答案

我也需要这个，因为我在一个事务内的服务对象中调用 dao，所以我调用了 get 方法，所以没有例外，我是能够获取记录.类似于 java 8 中的东西:

I needed this too and as I'm calling the dao inside a service object that is insise a transaction I call call the get method so no exception and I was able to fetch the records. Something like in java 8:

public ProductEntity findProduct(int id) {
    ProductEntity p = productRepository.findOne(id);
    p.getPresentations().stream().count();
    return p;
}

p.getPresentations().stream().count(); 将强制提取，我知道这不是一个干净的方法，但它可以同时完成工作

p.getPresentations().stream().count(); will force the fetch, I know is not a clean way to do it but it gets the job done in the mean time

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