Spring_Entity : mappedBy , cascade

public class Answer {


@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;

//...(중략)

@ManyToOne  //question : 한개 , answer : 여러개
private Question question;

}

public class Question {

//...(중략)

@OneToMany(mappedBy = "question" , cascade = CascadeType.REMOVE) 
private List<Answer> answerList;
}

//mappedBy : 참조 엔티티의 속성명 (question)

//cascade = CascadeType.REMOVE : 질문 삭제 시 연결된 답변 모두 삭제