实现Spring Data存储库的自定义方法并通过REST公开它们

Question

我正在尝试将自定义方法添加到我的Spring Data存储库PersonRepository,如1.3 Spring Data存储库的自定义实现中所述,并通过REST公开这些方法.初始代码来自使用REST示例访问JPA数据,以下是添加/修改类的代码:

interface PersonRepositoryCustom {
  List<Person> findByFistName(String name);
}

class PersonRepositoryImpl implements PersonRepositoryCustom, InitializingBean {
  @Override
  public void afterPropertiesSet() throws Exception {
    // initialization here
  }
  @Override
  public List<Person> findByFistName(String name) {
    // find the list of persons with the given firstname
  }
}

@RepositoryRestResource(collectionResourceRel = "people", path = "people")
public interface PersonRepository extends PagingAndSortingRepository<Person, Long> {
  List<Person> findByLastName(@Param("name") String name);  
}

当我运行应用程序并访问时http://localhost:8080/portfolio/search/,我得到以下响应正文:

{
  "_links" : {
    "findByLastName" : {
      "href" : "http://localhost:8080/people/search/findByLastName{?name}",
      "templated" : true
     }
  }
}

findByFirstName即使在PersonRepository界面中可用,为什么不暴露？

此外,有没有办法动态/编程添加通过REST公开的存储库？

Answer 1

两天后,我已经用这种方式解决了.

自定义存储库接口:

public interface PersonRepositoryCustom {
    Page<Person> customFind(String param1, String param2, Pageable pageable);
}

自定义存储库实现

public class PersonRepositoryImpl implements PersonRepositoryCustom{

    @Override
    public Page<Person> customFind(String param1, String param2, Pageable pageable) {
        // custom query by mongo template, entity manager...
    }
}

Spring Data Repository:

@RepositoryRestResource(collectionResourceRel = "person", path = "person")
public interface PersonRepository extends MongoRepository<Person, String>, PersonRepositoryCustom {
    Page<Person> findByName(@Param("name") String name, Pageable pageable);
}

Bean资源表示

public class PersonResource extends org.springframework.hateoas.Resource<Person>{

    public PersonResource(Person content, Iterable<Link> links) {
        super(content, links);
    }
}

资源汇编程序

@Component
public class PersonResourceAssembler extends ResourceAssemblerSupport<Person, PersonResource> {

    @Autowired
    RepositoryEntityLinks repositoryEntityLinks;

    public PersonResourceAssembler() {
        super(PersonCustomSearchController.class, PersonResource.class);
    }

    @Override
    public PersonResource toResource(Person person) {
        Link personLink = repositoryEntityLinks.linkToSingleResource(Person.class, person.getId());
        Link selfLink = new Link(personLink.getHref(), Link.REL_SELF);
        return new PersonResource(person, Arrays.asList(selfLink, personLink));
    }

}

自定义Spring MVC控制器

@BasePathAwareController
@RequestMapping("person/search")
public class PersonCustomSearchController implements ResourceProcessor<RepositorySearchesResource> {

    @Autowired
    PersonRepository personRepository;

    @Autowired
    PersonResourceAssembler personResourceAssembler;

    @Autowired
    private PagedResourcesAssembler<Person> pagedResourcesAssembler;

    @RequestMapping(value="customFind", method=RequestMethod.GET)
    public ResponseEntity<PagedResources> customFind(@RequestParam String param1, @RequestParam String param2, @PageableDefault Pageable pageable) {
        Page personPage = personRepository.customFind(param1, param2, pageable);
        PagedResources adminPagedResources = pagedResourcesAssembler.toResource(personPage, personResourceAssembler);

        if (personPage.getContent()==null || personPage.getContent().isEmpty()){
            EmbeddedWrappers wrappers = new EmbeddedWrappers(false);
            EmbeddedWrapper wrapper = wrappers.emptyCollectionOf(Person.class);
            List<EmbeddedWrapper> embedded = Collections.singletonList(wrapper);
            adminPagedResources = new PagedResources(embedded, adminPagedResources.getMetadata(), adminPagedResources.getLinks());
        }

        return new ResponseEntity<PagedResources>(adminPagedResources, HttpStatus.OK);
    }

    @Override
    public RepositorySearchesResource process(RepositorySearchesResource repositorySearchesResource) {
        final String search = repositorySearchesResource.getId().getHref();
        final Link customLink = new Link(search + "/customFind{?param1,param2,page,size,sort}").withRel("customFind");
        repositorySearchesResource.add(customLink);
        return repositorySearchesResource;
    }

}

Answer 2

这些方法没有暴露的原因是你基本上可以自由地在自定义存储库方法中实现任何你想要的东西,因此不可能推断出支持该特定资源的正确HTTP方法.

在你的情况下,使用普通GET可能没问题,在其他情况下,它可能必须是a,POST因为方法的执行有副作用.

目前的解决方案是制作一个自定义控制器来调用存储库方法.

Answer 3

对于GET方法,我使用了以下方法:

• @Query在Repository中创建一个虚方法(LogRepository.java)
• 使用声明的相同方法创建自定义接口(LogRepositoryCustom.java)
• 创建自定义接口的实现(LogRepositoryImpl.java)

使用这种方法,我不必管理预测和资源组装.

@RepositoryRestResource(collectionResourceRel = "log", path = "log")
public interface LogRepository extends PagingAndSortingRepository<Log, Long>, 
                                       LogRepositoryCustom {
    //NOTE: This query is just a dummy query
    @Query("select l from Log l where l.id=-1")
    Page<Log> findAllFilter(@Param("options") String options,
        @Param("eid") Long[] entityIds,
        @Param("class") String cls,
        Pageable pageable);

}

public interface LogRepositoryCustom {

    Page<Log> findAllFilter(@Param("options") String options,
        @Param("eid") Long[] entityIds,
        @Param("class") String cls,
        Pageable pageable);
}

在实现中,您可以自由使用存储库方法或直接转到持久层:

public class LogRepositoryImpl implements LogRepositoryCustom{

    @Autowired
    EntityManager entityManager;

    @Autowired
    LogRepository logRepository;

    @Override
    public Page<Log> findAllFilter(
        @Param("options") String options,
        @Param( "eid") Long[] entityIds,
        @Param( "class"   ) String cls,
        Pageable pageable) {

        //Transform kendoui json options to java object
        DataSourceRequest dataSourceRequest=null;
        try {
            dataSourceRequest = new ObjectMapper().readValue(options, DataSourceRequest.class);
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }


        Session s = entityManager.unwrap(Session.class);
        Junction junction = null;
        if (entityIds != null || cls != null) {
            junction = Restrictions.conjunction();
            if (entityIds != null && entityIds.length > 0) {
                junction.add(Restrictions.in("entityId", entityIds));
            }
            if (cls != null) {
                junction.add(Restrictions.eq("cls", cls));
            }
        }

    return dataSourceRequest.toDataSourceResult(s, Log.class, junction);
}