Entity vs DTO vs VO

 

# 1. Entity : DB 테이블과 매핑하는 객체

@Getter
@NoArgsConstructor
@Table(name = "member")
@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id = null;
    @Column(unique = true, nullable = false, length = 20)
    private String userId;
    @Column(nullable = false, length = 20)
    private String password;
    @Column(nullable = false, length = 20)
    private String name;
    private Integer age;

}

 

# 2. DTO (Data Transfer Object) : Layer 간 데이터 교환, 데이터 전달용

@Getter
public class BookDto {
    private long id;
    private String bookName;
    private String author;

  
}

 

# 3. VO (Value Object) 값을 갖는 순수한 도메인, 값 표현용

@Getter
public class UserVo {

    private final String name;
    private final Integer age;
    private final String address;

   
}