如何解决外键的列数必须与@ManyToMany链接表的引用主键相同
我在实体Function
和Result
之间存在多对多关系,并且我使用了一个名为Function_produces_result
的关联表。
AbstractEntity.java:
@Getter
@Setter
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
@ToString
public abstract class AbstractEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
}
FunctionEntity.java:
@Entity
@Table(name = "function")
@Getter
@Setter
public class FunctionEntity extends AbstractEntity {
private String description;
@ManyToMany
@JoinTable(
name = "function_produces_result",joinColumns = @JoinColumn(name = "function_id"),inverseJoinColumns = @JoinColumn(name = "result_id")
)
Set<ResultEntity> producedResults;
}
FunctionProduceResultEntity.java:
@Entity
@Table(name="function_produces_result")
@Getter
@Setter
public class FunctionProduceResultEntity extends AbstractEntity {
private int rank;
@ManyToOne
@JoinColumn(name = "function_id",nullable = false)
private FunctionEntity function;
@ManyToOne
@JoinColumn(name = "result_id",nullable = false)
private ResultEntity result;
}
ResultEntity.java
@Entity
@Table(name = "result")
@Getter
@Setter
public class ResultEntity extends AbstractEntity {
@Column(nullable = false,unique = true)
private String code;
private String name;
@Column(nullable = false)
private String type;
}
FunctionInputEntity:
@Entity
@Table(name="function_input")
@Getter
@Setter
public class FunctionInputEntity extends AbstractEntity {
@Enumerated(EnumType.STRING)
@Column(nullable = false)
private FunctionInputTypeEnum type;
@ManyToOne
@JoinColumn(name = "function_id",nullable = false)
private FunctionEntity function;
@ManyToOne
@JoinColumn(name = "driver_id")
private DriverEntity driver;
@ManyToOne
@JoinColumn(name = "function_result_id")
private FunctionProduceResultEntity sourceResource;
}
启动服务器时出现此错误:
Invocation of init method failed; nested exception is org.hibernate.MappingException: Foreign key (FK4t4snpmx4ck9oj8wkjxvjkg88:function_input [function_result_id])) must have same number of columns as the referenced primary key (function_produces_result [function_id,result_id])
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:342)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:113)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1697)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1442)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:624)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:612)
at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:51)
at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:36)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at com.socgen.marvel.ego.Application.main(Application.java:10)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
还有类似的问题,例如foreign key must have same number of columns as the referenced primary key for many-to-one mapping和Hibernate MappingException: Foreign key must have same number of columns as the referenced primary key,但不能解决我的问题。
解决方法
您的问题与以下方面有关:
@JoinTable(
name = "function_produces_result",joinColumns = @JoinColumn(name = "function_id"),inverseJoinColumns = @JoinColumn(name = "result_id")
)
您告诉Spring多对多关系是如何开始FunctionEntity
的,但是还没有提供一条指令来告诉Spring另一边result_id
映射到的字段(即您没有指定结束位置),只是它是多对多关系的一部分。
要解决此问题,您可以将以下内容添加到ResultEntity
类定义中:
@ManyToMany(mappedBy = "producedResults")
Set<FunctionEntity> functionEntities = new HashSet<>();
根据我在此处在线看到的内容,它应该可以正常工作:https://www.infoworld.com/article/3387643/java-persistence-with-jpa-and-hibernate-part-2-many-to-many-relationships.html
,在 FunctionInputEntity 中,Hibernate需要两个外键引用。您可以尝试以下吗?
@ManyToOne
@JoinColumns({
@JoinColumn(name = "function_id"),@JoinColumn(name = "result_id")
})
private FunctionProduceResultEntity sourceResource;
,
问题的根本原因是,您尝试通过@ManyToMany
将@JoinTable
mapping与隐藏的链接表混合,并通过linked entity进行映射。实际上,链接表function_produces_result
具有id
主键,但是当您通过@JoinTable
批注使用映射时,hibernate假定链接表应具有基于外键的复合主键@ManyToMany
关联中。
因此,我建议您以以下方式重写FunctionEntity
实体的映射:
@Entity
@Table(name = "function")
public class FunctionEntity extends AbstractEntity
{
@OneToMany(mappedBy = "function")
@MapKey(name = "result")
private Map<ResultEntity,FunctionProduceResultEntity> producedResults;
}
这将简化从ResultEntity
实体对FunctionEntity
实体的访问。
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