如何在Spring Boot中从实体访问存储库? [英] How can I access the repository from the entity in Spring Boot?

问题描述

在Spring Boot项目中，我有一个JPA实体，如下所示:

In a Spring Boot project I have a JPA entity, like this:

@Entity
public class Account {
}

然后我有了用于查询数据库的存储库:

and then I have the repository to query the database:

public interface AccountRepository extends JpaRepository<Account, UUID> {

}

在应用程序和测试中，通过执行以下操作很容易获得存储库:

In both the app and tests it's easy to get the repository by doing:

@Autowired
private AccountRepository accountRepository;

如何在Account类的方法中控制存储库?我尝试了@Autowired，但是没有用.

How can I get hold of the repository in a method in the Account class? I tried @Autowired but it didn't work.

对于那些争论设计的人，我的问题不关乎设计.我已经用Ruby和Rails以及用HugSQL编写的Clojure编写了这段代码，并且它是自包含的和简洁的:创建新记录时，我还生成了一个紧凑的唯一字母数字ID.在Ruby on Rails中，我将其作为库发布: https://github.com/pupeno/random_unique_id

For those arguing about design, my question is not about design. I have written this code in Ruby and Rails as well as Clojure with HugSQL and it was self contained and concise: when creating a new record I also generate a compact unique alphanumeric id. In Ruby on Rails I released it as a library: https://github.com/pupeno/random_unique_id

推荐答案

我有同样的问题，发现此Github存储库.

I had same question and found this Github repository.

以下是代码的某些部分:

Here are some parts of code:

...
import de.ck35.example.ddd.jpa.SpringEntityListener;
...

@Entity
@Table(name="bookshelf")
@EntityListeners(SpringEntityListener.class)
public class BookshelfEntity implements Bookshelf {

    ...


    private String category;

    @Autowired transient BookRepository bookRepository;
    @Autowired transient BookshelfSpaceRepository bookshelfSpaceRepository;

在 Javadoc 中描述了 de.ck35.example.ddd.jpa.SpringEntityListener 目的的位置:

Where de.ck35.example.ddd.jpa.SpringEntityListener purpose is described in Javadoc:

/**
 * Entity listener which allows dependency injection inside entities.
 * The listener can be registered via {@link EntityListeners} annotation.
 * 
 * Dependency injection annotations like {@link Autowired} are supported.
 * 
 * @author Christian Kaspari
 * @since 1.0.0
 */
public class SpringEntityListener {

    ...

    @PostLoad
    @PostPersist
    public void inject(Object object) {
        AutowireCapableBeanFactory beanFactory = get().getBeanFactory();
        if(beanFactory == null) {
            LOG.warn("Bean Factory not set! Depdendencies will not be injected into: '{}'", object);
            return;
        }
        LOG.debug("Injecting dependencies into entity: '{}'.", object);
        beanFactory.autowireBean(object);
    }

还有一种配置可以启用嵌套在类(在本例中为实体)中的存储库定义:

There is also configuration which enables Repositories definitions nested in classes (in this case entities):

@Configuration
@EnableJpaRepositories(basePackages="de.ck35.example.ddd.jpa", considerNestedRepositories=true)
@ComponentScan("de.ck35.example.ddd.jpa")
public class JpaConfiguration {

感谢此存储库的作者 Christian Kaspari .

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