Inflearn コミュニティ Q&A
投稿した質問数
지연로딩 프록시 질문입니다.
作成
·
330
1
여기서 member.getTeam()이 프록시고 getName()을 호출하면서 초기화가 돼고 이때 db를 조회한다고 배웠습니다. 그리고 쿼리가 나간 로그도 배운대로 진행됐습니다.
그런데 위에 코드로 실행해도 쿼리가 나간 로그도 처음 코드랑 동일하게 진행돼는데 아래 코드는 초기화 하는 부분이 없는데 어떻게 이런 결과가 나오는건가요???
回答 4
1
0
^^
System.out.println(""... )에서 다음 부분을 호출하기 때문에 그렇습니다. 해당 데이터가 필요하겠지요^^?
@Override
public String toString() {
return "Team{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
0
member entitiy 코드입니다
@Entity
public class Member {
@Id @GeneratedValue
private Long id;
private String username;
private int age;
@ManyToOne(fetch = LAZY)
@JoinColumn(name = "TEAM_ID")
private Team team;
@Enumerated(EnumType.STRING)
private MemberType type;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Team getTeam() {
return team;
}
public void setTeam(Team team) {
this.team = team;
}
public void changeTeam(Team team) {
this.team = team;
team.getMembers().add(this);
}
public MemberType getType() {
return type;
}
public void setType(MemberType type) {
this.type = type;
}
@Override
public String toString() {
return "Member{" +
"id=" + id +
", username='" + username + '\'' +
", age=" + age +
'}';
}
}
team entity 코드입니다
@Entity
public class Team {
@Id @GeneratedValue
private Long id;
private String name;
@OneToMany(mappedBy = "team")
private List<Member> members = new ArrayList<>();
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Member> getMembers() {
return members;
}
public void setMembers(List<Member> members) {
this.members = members;
}
@Override
public String toString() {
return "Team{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
위 코드의 로그입니다
Hibernate:
/* select
m
From
Member m */ select
member0_.id as id1_0_,
member0_.age as age2_0_,
member0_.TEAM_ID as TEAM_ID5_0_,
member0_.type as type3_0_,
member0_.username as username4_0_
from
Member member0_
Hibernate:
select
team0_.id as id1_3_0_,
team0_.name as name2_3_0_
from
Team team0_
where
team0_.id=?
member.getTeam().getName() = 팀A
member.getTeam().getName() = 팀A
Hibernate:
select
team0_.id as id1_3_0_,
team0_.name as name2_3_0_
from
Team team0_
where
team0_.id=?
member.getTeam().getName() = 팀B
위 코드의 로그입니다.
Hibernate:
/* select
m
From
Member m */ select
member0_.id as id1_0_,
member0_.age as age2_0_,
member0_.TEAM_ID as TEAM_ID5_0_,
member0_.type as type3_0_,
member0_.username as username4_0_
from
Member member0_
Hibernate:
select
team0_.id as id1_3_0_,
team0_.name as name2_3_0_
from
Team team0_
where
team0_.id=?
member.getTeam() = Team{id=1, name='팀A'}
member.getTeam() = Team{id=1, name='팀A'}
Hibernate:
select
team0_.id as id1_3_0_,
team0_.name as name2_3_0_
from
Team team0_
where
team0_.id=?
member.getTeam() = Team{id=2, name='팀B'}
0