인프런 커뮤니티 질문&답변

안녕하세요 

엔티티 직접사용 - 외래키 값에 대해 기대한   쿼리 실행이 다른데 어떤 이유인지 모르겠습니다. 

Team team = new Team();
team.setName("TeamA");
em.persist(team);


Member member = new Member();
member.setUsername("MemberA");
member.setTeam(team);
em.persist(member);

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

Member resultMember = em.createQuery("SELECT m FROM Member m WHERE m.team = :teamId", Member.class)
        .setParameter("teamId",team)
        .getSingleResult();

System.out.println("resultMember= " + resultMember);

위와 같이 실행했을 때 ]

Hibernate: 

    /* SELECT

        m 

    FROM

        Member m 

    WHERE

        m.team = :teamId */ select

            member0_.MEMBER_ID as MEMBER_I1_4_,

            member0_.CreateDate as CreateDa2_4_,

            member0_.createBy as createBy3_4_,

            member0_.lastModifyBy as lastModi4_4_,

            member0_.lastModifyDate as lastModi5_4_,

            member0_.enDateTime as enDateTi6_4_,

            member0_.stDateTime as stDateTi7_4_,

            member0_.TEAM_ID as TEAM_ID9_4_,

            member0_.USERNAME as USERNAME8_4_ 

        from

            Member member0_ 

        where

            member0_.TEAM_ID=?

Member 엔티티에 대한 쿼리만 발생할 줄 알았는데 

Hibernate: 

    select

        team0_.TEAM_ID as TEAM_ID1_8_0_,

        team0_.name as name2_8_0_ 

    from

        Team team0_ 

    where

        team0_.TEAM_ID=?

아래와 같이 Team에 대한 조회가 한번더 일어나게 됩니다. 

7분 19 초에 대한 실행된 SQL과 다른데 이유가 무엇일까요 ?!