인프런 커뮤니티 질문&답변

• 챕터9 값 타입 컬렉션 25분

• Address 값 타입 컬렉션 삭제 부분입니다.

우선 삭제되는 부분만 확인하고 싶어서, 새로운 값을 추가하지는 않았습니다.

System.out.println("========== 값 타입 컬렉션 주소 삭제================");
findMember.getAddressHistory().remove(new Address("old1", "street", "zipcode"));

데이터는 정상적으로 삭제되었는데, 저는 왜 Member테이블에 대해 update쿼리가 나가는지가 이해가 안가는데요,

Member 테이블에서는 수정사항이 발생할게 없는데 왜 update쿼리도 발생했는지 알 수 있을까요?

혹시 몰라 코드 전체와 결과 남깁니다.

Member member = new Member();
member.setUsername("member1");
member.setHomeAddress(new Address("homeCity","street","zipcode"));
member.getFavoriteFoods().add("꾸부라꼬");
member.getFavoriteFoods().add("카페라떼");
member.getFavoriteFoods().add("회");

member.getAddressHistory().add(new Address("old1", "street", "zipcode"));
member.getAddressHistory().add(new Address("old2", "street", "zipcode"));

em.persist(member);

em.flush();
em.clear();

System.out.println("================== 조회 시작 ==================");
Member findMember = em.find(Member.class, member.getId());

System.out.println("================== 컬렉션은 지연로딩, Addr 조회 ==================");
List<Address> addressHistory = findMember.getAddressHistory();
for(Address address : addressHistory) {
    System.out.println("address = " + address.getCity());
}

System.out.println("================== 컬렉션은 지연로딩, favorite food 조회 ==================");
Set<String> favoriteFoods = findMember.getFavoriteFoods();
for(String favoriteFood : favoriteFoods) {
    System.out.println("favoriteFood = " + favoriteFood);
}

Address homeAddress = findMember.getHomeAddress();
findMember.setHomeAddress(new Address("new change city", homeAddress.getStreet(), homeAddress.getZipcode()));

findMember.getFavoriteFoods().remove("꾸부라꼬");
findMember.getFavoriteFoods().add("무화과 크림치즈 베이글");

System.out.println("========== 값 타입 컬렉션 주소 삭제================");
findMember.getAddressHistory().remove(new Address("old1", "street", "zipcode"));


tx.commit();

Hibernate: 
    /* insert hellojpa.Member
        */ insert 
        into
            Member
            (city, street, zipcode, USERNAME, MEMBER_ID) 
        values
            (?, ?, ?, ?, ?)
Hibernate: 
    /* insert collection
        row hellojpa.Member.addressHistory */ insert 
        into
            ADDRESS
            (MEMBER_ID, city, street, zipcode) 
        values
            (?, ?, ?, ?)
Hibernate: 
    /* insert collection
        row hellojpa.Member.addressHistory */ insert 
        into
            ADDRESS
            (MEMBER_ID, city, street, zipcode) 
        values
            (?, ?, ?, ?)
Hibernate: 
    /* insert collection
        row hellojpa.Member.favoriteFoods */ insert 
        into
            FAVORITE_FOOD
            (MEMBER_ID, FOOD_NAME) 
        values
            (?, ?)
Hibernate: 
    /* insert collection
        row hellojpa.Member.favoriteFoods */ insert 
        into
            FAVORITE_FOOD
            (MEMBER_ID, FOOD_NAME) 
        values
            (?, ?)
Hibernate: 
    /* insert collection
        row hellojpa.Member.favoriteFoods */ insert 
        into
            FAVORITE_FOOD
            (MEMBER_ID, FOOD_NAME) 
        values
            (?, ?)
================== 조회 시작 ==================
Hibernate: 
    select
        member0_.MEMBER_ID as member_i1_6_0_,
        member0_.city as city2_6_0_,
        member0_.street as street3_6_0_,
        member0_.zipcode as zipcode4_6_0_,
        member0_.USERNAME as username5_6_0_ 
    from
        Member member0_ 
    where
        member0_.MEMBER_ID=?
================== 컬렉션은 지연로딩, Addr 조회 ==================
Hibernate: 
    select
        addresshis0_.MEMBER_ID as member_i1_0_0_,
        addresshis0_.city as city2_0_0_,
        addresshis0_.street as street3_0_0_,
        addresshis0_.zipcode as zipcode4_0_0_ 
    from
        ADDRESS addresshis0_ 
    where
        addresshis0_.MEMBER_ID=?
address = old1
address = old2
================== 컬렉션은 지연로딩, favoritfood 조회 조회 ==================
Hibernate: 
    select
        favoritefo0_.MEMBER_ID as member_i1_4_0_,
        favoritefo0_.FOOD_NAME as food_nam2_4_0_ 
    from
        FAVORITE_FOOD favoritefo0_ 
    where
        favoritefo0_.MEMBER_ID=?
foavortefood = 꾸부라꼬
foavortefood = 회
foavortefood = 카페라떼
========== 값 타입 컬렉션 주소 삭제================
Hibernate: 
    /* update
        hellojpa.Member */ update
            Member 
        set
            city=?,
            street=?,
            zipcode=?,
            USERNAME=? 
        where
            MEMBER_ID=?
Hibernate: 
    /* delete collection hellojpa.Member.addressHistory */ delete 
        from
            ADDRESS 
        where
            MEMBER_ID=?
Hibernate: 
    /* insert collection
        row hellojpa.Member.addressHistory */ insert 
        into
            ADDRESS
            (MEMBER_ID, city, street, zipcode) 
        values
            (?, ?, ?, ?)
Hibernate: 
    /* delete collection row hellojpa.Member.favoriteFoods */ delete 
        from
            FAVORITE_FOOD 
        where
            MEMBER_ID=? 
            and FOOD_NAME=?
Hibernate: 
    /* insert collection
        row hellojpa.Member.favoriteFoods */ insert 
        into
            FAVORITE_FOOD
            (MEMBER_ID, FOOD_NAME) 
        values
            (?, ?)

Process finished with exit code 0