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연관관계 설정
@ManyToOne
,@OneToMany
선언 방식만으로 연관관계 설정가능MainCategory delete 기능 적용
CascadeType.REMOVE
해당 부분을 속성으로 지정하지 않으면 부모 엔티티만 삭제되는데 여기서 연관된 SubCategory 데이터가 있으면 예외가 발생할 수 있습니다.성능 상의 이슈