JPA @Basic单表查询如何实现大字段懒加载

	@Entity
	@Table(name = "Company")
	public class Company {
 
		@OneToMany(mappedBy = "cId", fetch = FetchType.LAZY)
		private List<Employee>  employees;
 
		// other properties
 
		//getters and setters
	}

@Entity
@Table(name = "TEST")
public class TestCMP {
 
	@Id
	@IdSequenceConsumer(producerClass = UUIDProducer.class)
	private String id;
 
	@Lob
	@Basic(fetch = FetchType.LAZY)
	private String image;
 
	private String name;
    
    //getters and setters
}

@Repository
public interface TestRepository extends CrudRepository<TestCMP,String> {
}

	@Test
	@Transactional(value = "nwTransactionManager")
	public void BasicTest3() {
		TestCMP testCMP = testRepository.findOne("12345"); //懒加载，image没有查出来
		System.out.println(testCMP);
		System.out.println(testCMP.getImage()); //主动去获取image，进行加载
	}

select testcmp0_.id as id1_0_0_, testcmp0_.image as image2_0_0_, testcmp0_.name as name3_0_0_ from TEST testcmp0_ where testcmp0_.id=?

@Entity
@Table(name = "TEST")
public class TestCMP implements FieldHandled{
 
	@Id
	@IdSequenceConsumer(producerClass = UUIDProducer.class)
	private String id;
 
	@Lob
	@Basic(fetch = FetchType.LAZY)
	private String image;
 
	private String name;
 
	@Transient
	@JsonIgnore
	private FieldHandler fieldHandler;
 
	@Override
	public void setFieldHandler(FieldHandler handler) {
		this.fieldHandler = handler;
	}
 
	@Override
	public FieldHandler getFieldHandler() {
		return fieldHandler;
	}
 
	/**
	 * 获取image
	 *
	 * @return image
	 */
	public String getImage() {
		if (fieldHandler != null) {
			return (String) fieldHandler.readObject(this, "image", this.image);
		}
		return null;
	}
    // other getters and setters
}

select testcmp0_.id as id1_0_0_, testcmp0_.name as name3_0_0_ from TEST testcmp0_ where testcmp0_.id=?

select testcmp_.image as image2_0_ from TEST testcmp_ where testcmp_.id=?

spring.jpa.open-in-view=false

@Basic(fetch = FetchType.LAZY)

@Entity
@JsonInclude(Include.NON_EMPTY)

 public class AuthorDto implements Serializable {
    private static final long serialVersionUID = 1L;
    private final String name;
    private final int age;
    public AuthorDto(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public int getAge() {
        return age;
    }
}

@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
    @Transactional(readOnly = true)    
    List<AuthorDto> findByGenre(String genre);
}

 public class AuthorDto implements Serializable {
    private static final long serialVersionUID = 1L;
    private final String name;
    private final int age;
    public AuthorDto(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public int getAge() {
        return age;
    }
}

@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
    @Transactional(readOnly = true)
    @Query(value = "SELECT new com.bookstore.dto.AuthorDto(a.name, a.age) FROM Author a")
    List<AuthorDto> fetchAuthors();
}