The remaining elements of the array are returned as null when querying the collection after applying the batch size.
For example, if the batch size is 100 and only 1 id is entered, 99 nulls are bound.Below is the example code
{code:java}@Entity
public class Member {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@ManyToOne
@JoinColumn(name = "team_id")
private Team team;
protected Member() {
}
public void setId(Long id) {
this.id = id;
}
public void setTeam(Team team) {
this.team = team;
}
public Long id() {
return id;
}
public Team team() {
return team;
}
}
{ code}
{code:java}@Entity
public class Team {
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@OneToMany(mappedBy = "team")
private List<Member> members = new ArrayList<>();
public void addMember(Member member) {
members.add(member);
}
public Long id() {
return id;
}
public List<Member> members() {
return members;
}
}
{code}
{code:java}@Transactional
@SpringBootTest
class MemberTest {
@Autowired
private EntityManager em;
@Test
void error() {
Team team = new Team();
em.persist(team);
em.flush();
Member member = new Member();
member.setTeam(team);
em.persist(member);
em.flush();
em.clear();
Team team1 = em.find(Team.class, 1L);
System.out.println(team1.members().size());
}
}
{code}
h3. application.yml
{code:yaml}
logging:
level:
root: info
org.hiberante.SQL: debug
org.hibernate.orm.jdbc.bind: trace
org.apache.coyote.http11: debug #Http ???? ?? ???
spring:
datasource:
driver-class-name: org.h2.Driver
url: jdbc:h2:mem:testdb
username: sa
password:
h2:
console:
enabled: true
path: /h2-console
jpa:
show-sql: true
open-in-view: false
database-platform: org.hibernate.dialect.H2Dialect
properties:
hibernate:
format_sql: true
use_sql_comments: true
highlight_sql: true
default_batch_fetch_size: 100
hibernate:
ddl-auto: create
{code}
and below is error log image.
!스크린샷 2023-06-28 오후 7.00.04.png|width=1388,height=979!
This is likely because the CollectionBatchLoaderArrayParam class, the return value of the StandardBatchLoaderFactory.createCollectionBatchLoader() method, is assigned to a reusablecollectionLoader inside the AbstractCollectionPersister.createCollectionLoader() method and then reused.
In order to use the CollectionBatchLoaderArrayParam in any case inside StandardBatchLoaderFactory.createCollectionBatchLoader(), it seems that we need to do something about the logs. |
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