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<dependencies>
<!-- H2 데이터베이스-->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>2.0.202</version>
</dependency>
<!-- JPA 하이버네이트-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.6.1.Final</version>
</dependency>
</dependencies>
@Entity
public class Member {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
...
}
public class EntityMapping {
public static void main(String[] args) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
try{
Member member = new Member();;
member.setUsername("AAA");
em.persist(member);
tx.commit();
}catch(Exception e){
tx.rollback();
e.printStackTrace();
}finally {
em.close();
}
emf.close();
}
}
실행하면 콘솔에서
Hibernate: drop table if exists Member CASCADE Hibernate: create table Member ( id bigint generated by default as identity, name varchar(255) not null, primary key (id) )
와 같이 테이블이 생성되고
Hibernate:
/* insert hellojpa.Member
*/ insert
into
Member
(id, name)
values
(null, ?)
insert 쿼리는 위와 같이 데이터베이스로 호출하는것이 보입니다.
[오류로그]
12월 23, 2021 10:44:53 오후 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: NULL not allowed for column "ID"; SQL statement:
/* insert hellojpa.Member */ insert into Member (id, name) values (null, ?) [23502-202]
javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:780)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:760)
at hellojpa.EntityMapping.main(EntityMapping.java:18)
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:59)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:37)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:200)
at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3279)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3885)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:84)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:330)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:123)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:185)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:128)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:774)
... 2 more
Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "ID"; SQL statement:
/* insert hellojpa.Member */ insert into Member (id, name) values (null, ?) [23502-202]
null이 들어 갈수 없다고 나오는데 강의중에는 어떻게 오류가 안나고 되는지 궁금합니다.
답변 3
4
H2 2.1.210 버전에서 ;MODE=MySQL 추가하면 잘 됩니다.
spring.datasource.url=jdbc:h2:tcp://localhost/~/test;MODE=MySQL
또는
Member.java의
@GeneratedValue(strategy = GenerationType.IDENTITY)
-> @GeneratedValue(strategy = GenerationType.SEQUENCE)
수정하면 됩니다.
4
혹시 1.4.200으로 변경했는데도 안되시는 분들은
맨 뒤에 ;MODE=LEGACY 붙여서 한번 시도해보세요!!
방금 github에서 이슈 확인해서 글 지울려고 보니 댓글을 이미 달아주셨네요. 빠른 답변 감사합니다~