Spring Data Jpa返回自定义对象的3种方法实例

@Entity
@NoArgsConstructor
@AllArgsConstructor
@Table(name = "tasks")
@Data
public class Tasks extends BaseEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int taskId;
    private Integer websiteId;
    private String status;
    private String lastOperator;
    private String lastOperationTime;
    private String jobId;
    private int retryTimes;
}

@Entity
@Table(name = "websites")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Websites extends BaseEntity{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int websiteId;
    private String country;
    private String websiteName;
    private String baseUrl;
    private String smartphoneUrl;
    private String tabletUrl;
    private String smartdeviceUrl;
    private String websiteCategory;
    private String webtypeRefreshRate;
    private String urlRefreshRate;
    private String configTime;
    private String configDesc;
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class CustomizedDto implements Serializable {
    private static final long serialVersionUID = -7242005560621561106L;
    private String country;
    private String websiteName;
    private String baseUrl;
    private String status;
}

@Query(value = "select new com.bigdata.mrcrawler.dto.CustomizedDto(w.country,w.websiteName,w.baseUrl,t.status) " +
            "from Websites w join Tasks t on w.id=t.websiteId " +
            "where t.status=?1")
    List<CustomizedDto> getByStatus1(String status);

@Query(value = "select w.country as country,w.website_name as websiteName,w.base_url as baseUrl,t.status as status " +
            "from websites w join tasks t on w.website_id=t.website_id " +
            "where t.status=?1",nativeQuery = true)
    List<CustomizedDto> getByStatus2(String status);

    public List<CustomizedDto> t(String param) {
        String sql = "select w.country as country,w.website_name as websiteName,w.base_url as baseUrl,t.status as status " +
                "from websites w join tasks t on w.website_id=t.website_id " +
                "where t.status='" + param + "'";
        List<CustomizedDto> res = entityManager.createNativeQuery(sql).getResultList();
        return res;
    }

    public List<CustomizedDto> t(String param) {
        String sql = "select w.country as country,w.website_name as websiteName,w.base_url as baseUrl,t.status as status " +
                "from websites w join tasks t on w.website_id=t.website_id " +
                "where t.status=:param" ;
        Query nativeQuery = entityManager.createNativeQuery(sql);
        nativeQuery.setParameter("param", param);
        List<CustomizedDto> res  = nativeQuery.getResultList();
        return res;
    }

@Query(value = "select w.country as country,w.website_name as websiteName,w.base_url as baseUrl,t.status as status " +
            "from websites w join tasks t on w.website_id=t.website_id " +
            "where t.status=?1",nativeQuery = true)
    List<Map> getByStatus3(String status);

    public List<Map> t(String param) {
        return testRepository.getByStatus3(param);
    }

    public List<CustomizedDto> t(String param) {
        Object data = testRepository.getByStatus3(param);
        return  (List<CustomizedDto>)data;
    }