Category 테이블에서 외래키 생성이 안되는 오류

Question

학습하는 분들께 도움이 되고, 더 좋은 답변을 드릴 수 있도록 질문전에 다음을 꼭 확인해주세요. 1. 강의 내용과 관련된 질문을 남겨주세요. 2. 인프런의 질문 게시판과 자주 하는 질문(링크)을 먼저 확인해주세요. (자주 하는 질문 링크: https://bit.ly/3fX6ygx) 3. 질문 잘하기 메뉴얼(링크)을 먼저 읽어주세요. (질문 잘하기 메뉴얼 링크: https://bit.ly/2UfeqCG) 질문 시에는 위 내용은 삭제하고 다음 내용을 남겨주세요. ========================================= [질문 템플릿] 1. 강의 내용과 관련된 질문인가요? (예/아니오) 2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오) 3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오) [질문 내용] 여기에 질문 내용을 남겨주세요. 안녕하세요. 데이터 베이스는 MariaDB 10.9 를 사용하고 있는데 엔티티 클래스 설계 후 실행하면 Category테이블 생성에 에러가 납니다. Caused by: java.sql.SQLException: (conn=98) Can't create table studying .`category` (errno: 150 "Foreign key constraint is incorrectly formed") 보면 외래키가 설정되지 않은 parent_id 키가 생성이 되어있습니다.

David · Answer

혹시 기존 테이블 정보가 남아 있다면 삭제한 뒤 다시 시도해보시겠어요? 그래도 오류가 발생하면 아래 가이드를 따라 프로젝트 공유 부탁드립니다. 전체 프로젝트를 압축해서 구글 드라이브로 공유해서 링크를 남겨주세요. 구글 드라이브 업로드 방법은 다음을 참고해주세요. https://bit.ly/3fX6ygx 업로드시 권한 문제 꼭 확인해주세요 공유 기본 설정은 비공개로 되어 있어 업로드 한 본인 계정만 접근이 가능합니다. 본인 계정이 아닌 링크를 통한 타 계정 접근이 가능한지 확인하는 방법은 업로드 한 구글 계정을 로그아웃하고 링크를 접속하여 "액세스 권한 요청 화면"이 출력되는지 확인을 해주세요.

정윤주 · Answer

에러 전문입니다.

정윤주 · Answer

2022-11-11 17:29:37.308 WARN 16060 --- [ restartedMain] o.h.t.s.i.ExceptionHandlerLoggedImpl : GenerationTarget encountered exception accepting command : Error executing DDL " alter table category add constraint FK2y94svpmqttx80mshyny85wqr foreign key (parent_id) references category" via JDBC Statement org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL " alter table category add constraint FK2y94svpmqttx80mshyny85wqr foreign key (parent_id) references category" via JDBC Statement at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept( GenerationTargetToDatabase.java:67 ) ~[ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.applySqlString( SchemaCreatorImpl.java:458 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.applySqlStrings( SchemaCreatorImpl.java:442 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.createFromMetadata( SchemaCreatorImpl.java:389 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.performCreation( SchemaCreatorImpl.java:169 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation( SchemaCreatorImpl.java:138 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation( SchemaCreatorImpl.java:124 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction( SchemaManagementToolCoordinator.java:168 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process( SchemaManagementToolCoordinator.java:85 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.internal.SessionFactoryImpl.<init>( SessionFactoryImpl.java:335 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build ( SessionFactoryBuilderImpl.java:471 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build ( EntityManagerFactoryBuilderImpl.java:1498 ) [ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory( SpringHibernateJpaPersistenceProvider.java:58 ) [spring-orm-5.3.23.jar:5.3.23] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory( LocalContainerEntityManagerFactoryBean.java:365 ) [spring-orm-5.3.23.jar:5.3.23] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory( AbstractEntityManagerFactoryBean.java:409 ) [spring-orm-5.3.23.jar:5.3.23] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet( AbstractEntityManagerFactoryBean.java:396 ) [spring-orm-5.3.23.jar:5.3.23] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet( LocalContainerEntityManagerFactoryBean.java:341 ) [spring-orm-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.invokeInitMethods( AbstractAutowireCapableBeanFactory.java:1863 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.initializeBean( AbstractAutowireCapableBeanFactory.java:1800 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.doCreateBean( AbstractAutowireCapableBeanFactory.java:620 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBean( AbstractAutowireCapableBeanFactory.java:542 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractBeanFactory.lambda$doGetBean$0( AbstractBeanFactory.java:335 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .DefaultSingletonBeanRegistry.getSingleton( DefaultSingletonBeanRegistry.java:234 ) ~[spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractBeanFactory.doGetBean( AbstractBeanFactory.java:333 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.beans.factory.support .AbstractBeanFactory.getBean( AbstractBeanFactory.java:208 ) [spring-beans-5.3.23.jar:5.3.23] at org.springframework.context.support .AbstractApplicationContext.getBean( AbstractApplicationContext.java:1154 ) ~[spring-context-5.3.23.jar:5.3.23] at org.springframework.context.support .AbstractApplicationContext.finishBeanFactoryInitialization( AbstractApplicationContext.java:908 ) ~[spring-context-5.3.23.jar:5.3.23] at org.springframework.context.support .AbstractApplicationContext.refresh( AbstractApplicationContext.java:583 ) ~[spring-context-5.3.23.jar:5.3.23] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh( ServletWebServerApplicationContext.java:147 ) ~[spring-boot-2.7.5.jar:2.7.5] at org.springframework.boot.SpringApplication.refresh( SpringApplication.java:734 ) ~[spring-boot-2.7.5.jar:2.7.5] at org.springframework.boot.SpringApplication.refreshContext( SpringApplication.java:408 ) ~[spring-boot-2.7.5.jar:2.7.5] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:308 ) ~[spring-boot-2.7.5.jar:2.7.5] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:1306 ) ~[spring-boot-2.7.5.jar:2.7.5] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:1295 ) ~[spring-boot-2.7.5.jar:2.7.5] at jpabook.jpashop.JpashopApplication.main( JpashopApplication.java:10 ) ~[main/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_351] at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:62 ) ~[na:1.8.0_351] at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 ) ~[na:1.8.0_351] at java.lang.reflect.Method.invoke( Method.java:498 ) ~[na:1.8.0_351] at org.springframework.boot.devtools.restart.RestartLauncher.run ( RestartLauncher.java:49 ) ~[spring-boot-devtools-2.7.5.jar:2.7.5] Caused by: java.sql.SQLException: (conn=140) Can't create table studying .`category` (errno: 150 "Foreign key constraint is incorrectly formed") at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get( ExceptionMapper.java:261 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException( ExceptionMapper.java:171 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.MariaDbStatement.executeExceptionEpilogue( MariaDbStatement.java:238 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.MariaDbStatement.executeInternal( MariaDbStatement.java:327 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.MariaDbStatement.execute( MariaDbStatement.java:378 ) ~[mariadb-java-client-2.4.1.jar:na] at com.zaxxer.hikari.pool.ProxyStatement.execute( ProxyStatement.java:94 ) ~[HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.HikariProxyStatement.execute( HikariProxyStatement.java ) ~[HikariCP-4.0.3.jar:na] at com.p6spy.engine.wrapper.StatementWrapper.execute( StatementWrapper.java:114 ) ~[p6spy-3.8.2.jar:na] at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept( GenerationTargetToDatabase.java:54 ) ~[ hibernate-core-5.6.12.Final .jar: 5.6.12.Final ] ... 39 common frames omitted Caused by: java.sql.SQLException: Can't create table studying .`category` (errno: 150 "Foreign key constraint is incorrectly formed") at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readErrorPacket( AbstractQueryProtocol.java:1594 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket( AbstractQueryProtocol.java:1453 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.getResult( AbstractQueryProtocol.java:1415 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.executeQuery( AbstractQueryProtocol.java:227 ) ~[mariadb-java-client-2.4.1.jar:na] at org.mariadb.jdbc.MariaDbStatement.executeInternal( MariaDbStatement.java:321 ) ~[mariadb-java-client-2.4.1.jar:na] ... 44 common frames omitted

David · Answer

안녕하세요. 정윤주님, 공식 서포터즈 David입니다. 에러 전문을 올려주시길 요청드립니다. parent_id는 Category parent에 붙어있는 @JoinColumn 에 의해 생성된 외래키 컬럼이 맞습니다. 감사합니다.