如何通过Spring Data Jpa自定义repository将实体类转换为DTO？

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近期项目中需要关联几张表，并将字段转换出来。在此记录以下内容，感觉网上的写法都不太规范和清晰。@Entity @SqlResultSetMapping(name=TestMapping, entities={@EntityResult(entityClass=com.xxx.xx.dat)})

近期项目中需要 关联 几张表再把字段转出来，在这里记录以下，我感觉网上写的都不太规范和清晰。

@Entity @SqlResultSetMapping( name="TestMapping", entities = { @EntityResult( entityClass = com.xxx.xx.data.model.TestEntity.class, fields = { @FieldResult(name="id",column="id"), @FieldResult(name="localTime",column="time"), @FieldResult(name="maximumAppointment",column="maxAppointment"), } ) } ) @NamedNativeQuery(name="getTestQuery", query="select tableC.id as id,tableB.time,tableC.maximumAppointment as maxAppointment from tableB " + " inner join tableA on tableA.id = tableB.tableAId " + " inner join tableC on tableB.id = tableC.tableBId " + " inner join custom on custom.id = tableA.customId " + "where " + " tableA.locationId = :locationId" + " and custom.id = :customId" + " and tableB.deleted = false ", resultSetMapping="TestMapping") @Data public class TestEntity { @Id private String id; private LocalTime localTime; private Integer maximumAppointment; }

需要声明接口：

@Repository public interface TestEntityRepository extends JpaRepository<TestEntity,String> { @Query(name="getTestQuery") List<TestEntity> getTestQuery(String locationId, String customId); }

若不想声明接口，那可以用EntityManager 来实现。

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();

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