Spring Data JPA Custom Repository

时间:2018-04-25 22:16:48

标签: spring spring-boot spring-data spring-data-jpa spring-boot-starter

在尝试使用Spring Data JPA实现自定义存储库时,我遇到了一些问题。

我尝试按照这样的一些参考指南但我找不到问题: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.custom-implementations

我不知道为什么Spring会尝试将自定义存储库方法作为我的实体属性进行查找。

spring-boot-starter-data-jpa => 1.5.11.RELEASE

实体:

public class MyEntity {

    private Integer id
    private String name;

    // Getter/Setters...
}

服务:

@Service
public class MyServiceImpl implements MyService {


    @Autowired
    private MyRepository repository;

    //...

    public MyDTO customFind(Long id){


        return repository.customFind(id);
    }
}

存储库:

@Repository
public interface MyRepository extends JpaRepository<MyEntity, Long>, QueryDslPredicateExecutor<MyEntity>, MyCustomRepository {

    //no-op
}

自定义存储库:

public interface MyCustomRepository {

    List<MyDTO> customFind(Long id);

}

Custom Repository Impl:

public class MyCustomRepositoryImpl implements MyCustomRepository {


    @Autowired
    private EntityManager entityManager;


    public List<MyDTO> customFind(Long id){


        JPAQuery<EmpregadoEntity> query = new JPAQuery<>(entityManager);
        MyDTO myDTO = query...  //... JPA query return MyDTO

        return myDTO;

    }
}

当我运行应用程序时,我得到了PropertyReferenceException:

例外:

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property customFind found for type MyEntity!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:79)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:335)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:311)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:274)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:245)
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76)
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:247)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:398)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:378)
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:86)
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:70)

2 个答案:

答案 0 :(得分:0)

它使用的实体和ID的类型,MyEntity和Long,在JpaRepository的通用参数中指定。这就是您的自定义存储库应该使用的内容。因此,MyCustomRepositoryImpl应使用 MyEntity 而不是 MyDTO

答案 1 :(得分:0)

我只是将类“ MyCustomRepository”重命名为“ MyRepositoryCustom”以解决此问题。

现在工作正常! =)