주문(Order) + 배송정보(Delivery) + 회원(Member) 조회하는 API를 만들거임.
점차적으로 성능을 향상시킬거임.
xToOne은 기본이 즉시로딩이라, 명시적으로 LAZY로딩으로 해 줘야 함.
일단은, 이런 연관관계 무시하고,
@GetMapping("/api/v1/simple-orders")
public List<Order> ordersV1(){
List<Order> all = orderRepository.findAllString(new OrderSearch());
return all;
}
이렇게 하면 무한루프에 빠짐.
왜냐하면,
@Entity
@Table(name = "orders")
@Getter
@NoArgsConstructor(access = AccessLevel.PUBLIC)
public class Order {
@Id @GeneratedValue
@Column(name = "order_id")
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "member_id")
private Member member;
@OneToMany(mappedBy = "order", cascade = CascadeType.ALL)
private List<OrderItem> orderItems = new ArrayList<>();
@OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "delivery_id")
private Delivery delivery;
private LocalDateTime orderDate;
@Enumerated(EnumType.STRING)
private OrderStatus status;
}order 엔티티인데 양방향 연관관계라 order가 member 조회해오고 member안에 있는 order들 조회해오고 또 그 order안에 있는 member조회해오고 또 그 member안에있는 order들 조회해오고..
양방향은 이렇게 끝이 안남. 거울끼리 서로 마주보게 하는 그런 느낌임.
이럴 경우 우선 해결법은,
Order에서 양방향 걸려있는 애들,
@JsonIgnore
@OneToMany(mappedBy = "member")
private List<Order> orders = new ArrayList<>();@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "order_id")
@JsonIgnore
private Order order;@OneToOne(mappedBy = "delivery", fetch = FetchType.LAZY)
@JsonIgnore
private Order order;
걔네들 다 찾아가서 @JsonIgnore 해서 Json 거부 해준다.
그러면 거부 했으니, 얘네껀 안 읽고 Order것만 읽겠지..?
즉, 우리가 Order를 조회해 오는거니 얘네들은 Order를 조회해 오면 안된다. 그러면 무한루프에 빠지니까.
그러니까 어떤 양방향 연관관계에 있는 애들은 싹다 @JsonIgnore 해 줘서 api, 즉 json으로 가져오는 것을 거부해준다.
이미 order는 있다.
근데 이것도 문제가 있다.
LAZY는 프록시로 씌워서 가져온다.
객체를 json으로 변환해주는 jackson 라이브러리는 jpa꺼가 아니라서 저 씌워주는 프록시에 대한 정체를 모른다.
얘는 그냥 Order라는 것을 json으로 변환하려고 했는데, 무슨 이상한 프록시 객체인 것이다.
그래서,
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: java.util.ArrayList[0]->jpabook.jpashop.domain.Order["member"]->jpabook.jpashop.domain.Member$HibernateProxy$46Sq1l6W["hibernateLazyInitializer"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.15.3.jar:2.15.3]
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1308) ~[jackson-databind-2.15.3.jar:2.15.3]
at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:414) ~[jackson-databind-2.15.3.jar:2.15.3]대충 이런 식으로 no serializer 직렬화, 직렬적으로 데이터를 바꿔주는 그런 것을 찾을 수 없다는 것이다. 어댑터 패턴인가 보다.
여튼, 또 이거의 해결 방법은
그냥 하이버네이트보고 지연로딩의 경우 호출해서 정상적으로 로딩한 것들 말고는 그냥 json으로 뿌리지 말라고 할 수 있다.(프록시인 애들은 먼저 뿌리지 않았다가, 만져서 로딩하면 그 로딩한 것들만 뿌린다.)
그럴려면 우선 잭슨의 하이버네이트와 관련된 모듈을 가져와야 한다.
implementation 'com.fasterxml.jackson.datatype:jackson-datatype-hibernate5-jakarta'
그 다음 그냥 아무데나 빈으로 등록시켜준다.
@SpringBootApplication
public class JpashopApplication {
public static void main(String[] args) {
SpringApplication.run(JpashopApplication.class, args);
}
@Bean
Hibernate5JakartaModule hibernate5Module(){
return new Hibernate5JakartaModule();
}
}걍 메인에다 빈으로 했음
그러면 이제, 조회 해보면 뭐 @JsonIgnore이런 것도 이제 안해줘도 되고 (그래도 @JsonIgnore는 무조건 명시해 줘야 함),
[
{
"id": 1,
"member": null,
"orderItems": null,
"delivery": null,
"orderDate": "2023-11-13T12:08:24.019551",
"status": "ORDER",
"totalPrice": 50000
},
{
"id": 2,
"member": null,
"orderItems": null,
"delivery": null,
"orderDate": "2023-11-13T12:08:24.099505",
"status": "ORDER",
"totalPrice": 220000
}
]이렇게 지연로딩인 건 null로 가져옴.
근데, 우리는 이것도 안쓸거임.
애초에 api를 클라이언트로부터 엔티티로 받거나 주지를 않을거임.
저게 하이버네이트 모듈 기본 설정이 LAZY는 null로 가져오는 거라서 null로 가져오는 거고, FORCE_LAZY_LODING 또 이렇게 설정하게끔 할 수 있는데 그러면 그 때는 잘 가져옴.
[
{
"id": 1,
"member": {
"id": 1,
"name": "userA",
"address": {
"city": "서울",
"street": "1",
"zipcode": "1111"
}
},
"orderItems": [
{
"id": 1,
"item": {
"id": 1,
"name": "JPA1 BOOK",
"price": 10000,
"stockQuantity": 99,
"categories": [],
"author": null,
"isbn": null
},
"orderPrice": 10000,
"count": 1,
"totalPrice": 10000
},
{
"id": 2,
"item": {
"id": 2,
"name": "JPA2 BOOK",
"price": 20000,
"stockQuantity": 98,
"categories": [],
"author": null,
"isbn": null
},
"orderPrice": 20000,
"count": 2,
"totalPrice": 40000
}
],
"delivery": {
"id": 1,
"address": {
"city": "서울",
"street": "1",
"zipcode": "1111"
},
"status": "READY"
},
"orderDate": "2023-11-13T12:18:34.543708",
"status": "ORDER",
"totalPrice": 50000
},
{
"id": 2,
"member": {
"id": 2,
"name": "userB",
"address": {
"city": "진주",
"street": "2",
"zipcode": "2222"
}
},
"orderItems": [
{
"id": 3,
"item": {
"id": 3,
"name": "SPRING1 BOOK",
"price": 20000,
"stockQuantity": 197,
"categories": [],
"author": null,
"isbn": null
},
"orderPrice": 20000,
"count": 3,
"totalPrice": 60000
},
{
"id": 4,
"item": {
"id": 4,
"name": "SPRING2 BOOK",
"price": 40000,
"stockQuantity": 296,
"categories": [],
"author": null,
"isbn": null
},
"orderPrice": 40000,
"count": 4,
"totalPrice": 160000
}
],
"delivery": {
"id": 2,
"address": {
"city": "진주",
"street": "2",
"zipcode": "2222"
},
"status": "READY"
},
"orderDate": "2023-11-13T12:18:34.623662",
"status": "ORDER",
"totalPrice": 220000
}
]
물론 이거 @JsonIgnore 해 줘서 명시적으로 알려줘야 하긴 함.. 하이버네이트 모듈이 @JsonIgnore는 따로 읽는 모양인가 보네.
근데 이것도 하지 마셈.
나가는 쿼리 보면,
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
join
member m1_0
on m1_0.member_id=o1_0.member_id
fetch
first ? rows only
2023-11-13T12:18:42.302+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [INTEGER] - [1000]
2023-11-13T12:18:42.303+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522303 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 join member m1_0 on m1_0.member_id=o1_0.member_id fetch first ? rows only
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 join member m1_0 on m1_0.member_id=o1_0.member_id fetch first 1000 rows only;
2023-11-13T12:18:42.381+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
m1_0.member_id,
m1_0.city,
m1_0.street,
m1_0.zipcode,
m1_0.name
from
member m1_0
where
m1_0.member_id=?
2023-11-13T12:18:42.382+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.382+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522382 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=?
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=1;
2023-11-13T12:18:42.394+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.order_item_id,
o1_0.count,
o1_0.item_id,
o1_0.order_price
from
order_item o1_0
where
o1_0.order_id=?
2023-11-13T12:18:42.395+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.395+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522395 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=?
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=1;
2023-11-13T12:18:42.398+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
i1_0.item_id,
i1_0.dtype,
i1_0.name,
i1_0.price,
i1_0.stock_quantity,
i1_0.artist,
i1_0.etc,
i1_0.author,
i1_0.isbn,
i1_0.actor,
i1_0.director
from
item i1_0
where
i1_0.item_id=?
2023-11-13T12:18:42.399+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.399+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522399 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=?
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=1;
2023-11-13T12:18:42.403+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
c1_0.item_id,
c1_1.category_id,
c1_1.name,
c1_1.parent_id
from
category_item c1_0
join
category c1_1
on c1_1.category_id=c1_0.category_id
where
c1_0.item_id=?
2023-11-13T12:18:42.403+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.404+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522404 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=?
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=1;
2023-11-13T12:18:42.404+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
i1_0.item_id,
i1_0.dtype,
i1_0.name,
i1_0.price,
i1_0.stock_quantity,
i1_0.artist,
i1_0.etc,
i1_0.author,
i1_0.isbn,
i1_0.actor,
i1_0.director
from
item i1_0
where
i1_0.item_id=?
2023-11-13T12:18:42.405+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:18:42.405+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522405 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=?
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=2;
2023-11-13T12:18:42.406+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
c1_0.item_id,
c1_1.category_id,
c1_1.name,
c1_1.parent_id
from
category_item c1_0
join
category c1_1
on c1_1.category_id=c1_0.category_id
where
c1_0.item_id=?
2023-11-13T12:18:42.406+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:18:42.407+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522407 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=?
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=2;
2023-11-13T12:18:42.410+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
d1_0.delivery_id,
d1_0.city,
d1_0.street,
d1_0.zipcode,
d1_0.status
from
delivery d1_0
where
d1_0.delivery_id=?
2023-11-13T12:18:42.410+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.411+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522411 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=?
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=1;
2023-11-13T12:18:42.414+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
where
o1_0.delivery_id=?
2023-11-13T12:18:42.414+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:18:42.415+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522415 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=?
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=1;
2023-11-13T12:18:42.417+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
m1_0.member_id,
m1_0.city,
m1_0.street,
m1_0.zipcode,
m1_0.name
from
member m1_0
where
m1_0.member_id=?
2023-11-13T12:18:42.417+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:18:42.417+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522417 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=?
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=2;
2023-11-13T12:18:42.418+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.order_item_id,
o1_0.count,
o1_0.item_id,
o1_0.order_price
from
order_item o1_0
where
o1_0.order_id=?
2023-11-13T12:18:42.418+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:18:42.418+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522418 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=?
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=2;
2023-11-13T12:18:42.419+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
i1_0.item_id,
i1_0.dtype,
i1_0.name,
i1_0.price,
i1_0.stock_quantity,
i1_0.artist,
i1_0.etc,
i1_0.author,
i1_0.isbn,
i1_0.actor,
i1_0.director
from
item i1_0
where
i1_0.item_id=?
2023-11-13T12:18:42.420+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [3]
2023-11-13T12:18:42.420+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522420 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=?
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=3;
2023-11-13T12:18:42.421+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
c1_0.item_id,
c1_1.category_id,
c1_1.name,
c1_1.parent_id
from
category_item c1_0
join
category c1_1
on c1_1.category_id=c1_0.category_id
where
c1_0.item_id=?
2023-11-13T12:18:42.421+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [3]
2023-11-13T12:18:42.421+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522421 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=?
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=3;
2023-11-13T12:18:42.422+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
i1_0.item_id,
i1_0.dtype,
i1_0.name,
i1_0.price,
i1_0.stock_quantity,
i1_0.artist,
i1_0.etc,
i1_0.author,
i1_0.isbn,
i1_0.actor,
i1_0.director
from
item i1_0
where
i1_0.item_id=?
2023-11-13T12:18:42.422+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [4]
2023-11-13T12:18:42.422+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522422 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=?
select i1_0.item_id,i1_0.dtype,i1_0.name,i1_0.price,i1_0.stock_quantity,i1_0.artist,i1_0.etc,i1_0.author,i1_0.isbn,i1_0.actor,i1_0.director from item i1_0 where i1_0.item_id=4;
2023-11-13T12:18:42.423+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
c1_0.item_id,
c1_1.category_id,
c1_1.name,
c1_1.parent_id
from
category_item c1_0
join
category c1_1
on c1_1.category_id=c1_0.category_id
where
c1_0.item_id=?
2023-11-13T12:18:42.423+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [4]
2023-11-13T12:18:42.423+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522423 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=?
select c1_0.item_id,c1_1.category_id,c1_1.name,c1_1.parent_id from category_item c1_0 join category c1_1 on c1_1.category_id=c1_0.category_id where c1_0.item_id=4;
2023-11-13T12:18:42.424+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
d1_0.delivery_id,
d1_0.city,
d1_0.street,
d1_0.zipcode,
d1_0.status
from
delivery d1_0
where
d1_0.delivery_id=?
2023-11-13T12:18:42.424+09:00 TRACE 11000 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:18:42.424+09:00 INFO 11000 --- [nio-8080-exec-2] p6spy : #1699845522424 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=?
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=2;
2023-11-13T12:18:42.425+09:00 DEBUG 11000 --- [nio-8080-exec-2] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
where
o1_0.delivery_id=?어마어마하게 많이 나감.
하이버네이트 모듈 자체를 LAZY로딩 때문에 쓰는 게 애매하기도 하고, 클라이언트로부터 받아오는걸 엔티티 자체로 받아오는 것도 나쁨.
하이버네이트 모듈 자체는 뭐 상황에 따라 필요할 수도 있겠지만, 일단 엔티티 자체를 저렇게 받는 것은 나쁜거고 일단,
LAZY로딩 특성을 이용해서 원하는 것만 가져오는 방법이 있다.
@SpringBootApplication
public class JpashopApplication {
public static void main(String[] args) {
SpringApplication.run(JpashopApplication.class, args);
}
@Bean
Hibernate5JakartaModule hibernate5Module(){
return new Hibernate5JakartaModule();
}
}이렇게 아무것도 안한 모듈 기본 설정으로.
그냥 for문 하면서 조회 시켜버리면 된다.
그런데 그것도.. for문 돌며 접근할 때마다 select 문을 보내게 된다..
@GetMapping("/api/v1/simple-orders")
public List<Order> ordersV1(){
List<Order> all = orderRepository.findAllString(new OrderSearch());
for (Order order : all) {
order.getMember().getName();
order.getDelivery().getAddress();
}
return all;
}
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
join
member m1_0
on m1_0.member_id=o1_0.member_id
fetch
first ? rows only
2023-11-13T12:52:45.948+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [INTEGER] - [1000]
2023-11-13T12:52:45.948+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565948 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 join member m1_0 on m1_0.member_id=o1_0.member_id fetch first ? rows only
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 join member m1_0 on m1_0.member_id=o1_0.member_id fetch first 1000 rows only;
2023-11-13T12:52:45.968+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
m1_0.member_id,
m1_0.city,
m1_0.street,
m1_0.zipcode,
m1_0.name
from
member m1_0
where
m1_0.member_id=?
2023-11-13T12:52:45.972+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:52:45.973+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565973 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=?
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=1;
2023-11-13T12:52:45.978+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
d1_0.delivery_id,
d1_0.city,
d1_0.street,
d1_0.zipcode,
d1_0.status
from
delivery d1_0
where
d1_0.delivery_id=?
2023-11-13T12:52:45.978+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:52:45.979+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565979 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=?
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=1;
2023-11-13T12:52:45.982+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
where
o1_0.delivery_id=?
2023-11-13T12:52:45.982+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:52:45.983+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565983 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=?
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=1;
2023-11-13T12:52:45.984+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
m1_0.member_id,
m1_0.city,
m1_0.street,
m1_0.zipcode,
m1_0.name
from
member m1_0
where
m1_0.member_id=?
2023-11-13T12:52:45.984+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:52:45.984+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565984 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=?
select m1_0.member_id,m1_0.city,m1_0.street,m1_0.zipcode,m1_0.name from member m1_0 where m1_0.member_id=2;
2023-11-13T12:52:45.985+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
d1_0.delivery_id,
d1_0.city,
d1_0.street,
d1_0.zipcode,
d1_0.status
from
delivery d1_0
where
d1_0.delivery_id=?
2023-11-13T12:52:45.985+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:52:45.985+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565985 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=?
select d1_0.delivery_id,d1_0.city,d1_0.street,d1_0.zipcode,d1_0.status from delivery d1_0 where d1_0.delivery_id=2;
2023-11-13T12:52:45.986+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.delivery_id,
o1_0.member_id,
o1_0.order_date,
o1_0.status
from
orders o1_0
where
o1_0.delivery_id=?
2023-11-13T12:52:45.986+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [2]
2023-11-13T12:52:45.987+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847565987 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=?
select o1_0.order_id,o1_0.delivery_id,o1_0.member_id,o1_0.order_date,o1_0.status from orders o1_0 where o1_0.delivery_id=2;
2023-11-13T12:52:46.054+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.order_item_id,
o1_0.count,
o1_0.item_id,
o1_0.order_price
from
order_item o1_0
where
o1_0.order_id=?
2023-11-13T12:52:46.055+09:00 TRACE 12948 --- [nio-8080-exec-1] org.hibernate.orm.jdbc.bind : binding parameter [1] as [BIGINT] - [1]
2023-11-13T12:52:46.056+09:00 INFO 12948 --- [nio-8080-exec-1] p6spy : #1699847566056 | took 0ms | statement | connection 7| url jdbc:h2:tcp://localhost/./jpashop
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=?
select o1_0.order_id,o1_0.order_item_id,o1_0.count,o1_0.item_id,o1_0.order_price from order_item o1_0 where o1_0.order_id=1;
2023-11-13T12:52:46.059+09:00 DEBUG 12948 --- [nio-8080-exec-1] org.hibernate.SQL :
select
o1_0.order_id,
o1_0.order_item_id,
o1_0.count,
o1_0.item_id,
o1_0.order_price
from
order_item o1_0
where
o1_0.order_id=?
엔티티 클라이언트에게 직접 받거나 주지 말고, Dto로 받거나 준다.
지연로딩만 사용해라. XToOne은 즉시 로딩이 기본이다.
연관관계 애노테이션에서 명시를 해 줘야 한다.
https://qwefdg3.tistory.com/755
성능 최적화가 필요한 경우 fetch join 사용
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