Java JPA@ManyToMany仅包含部分主键
我通过第三个表在两个表之间建立了多对多关系:Java JPA@ManyToMany仅包含部分主键,java,jpa,many-to-many,composite-primary-key,Java,Jpa,Many To Many,Composite Primary Key,我通过第三个表在两个表之间建立了多对多关系: TABLE_A A_TO_B TABLE_B --------- ------------- ------------ KEY (PK) KEY_A (PK, FK) KEY (PK) --some more Atributes KEY
TABLE_A A_TO_B TABLE_B
--------- ------------- ------------
KEY (PK) KEY_A (PK, FK) KEY (PK)
--some more Atributes KEY_B (PK, FK) START_DATE (PK)
--some Attributes END_DATE
--some Attributes
正如您所看到的,这个表结构的问题是表B
有一个包含条目的起始日期的组合主键。这是为了能够有入口版本。我无法更改表格结构。我想通过@ManyToMany
属性加入JPA中的表A
和表B
。但是JPA要求,A到B
知道表B的完整主键。但我完全可以忽略开始日期
,只需使用键B
获取特定键a
的表B
的所有条目
这是错误:
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [spring_hibernate_configuration.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: referencedColumnNames(KEY_B) of de.mycompany.entity.model.TableA.listOfBs referencing de.mycompany.entity.model.TableB not mapped to a single property
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1078)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:84)
at de.mycompany.Start.main(Start.java:14)
Caused by: org.hibernate.AnnotationException: referencedColumnNames(KEY_B) of de.mycompany.entity.model.TableA.listOfBs referencing de.mycompany.entity.model.TableB not mapped to a single property
at org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference(BinderHelper.java:320)
at org.hibernate.cfg.annotations.CollectionBinder.bindManytoManyInverseFk(CollectionBinder.java:1680)
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1560)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:800)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:725)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:54)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1621)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1589)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:858)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:885)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:370)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:359)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 11 more
表A至表B
@实体
@表(name=“A到B”)
公共类AtoB{
@嵌入ID
私有原子id;
/*接球手和接球手*/
}
A到B的嵌入ID
公共类AtoBId实现可序列化{
@列(name=“KEY\u A”,nullable=false)
私钥;
@列(name=“KEY_B”,nullable=false)
私钥;
/*接球手和接球手*/
}
当我用另一个包含日期的假联接列定义@manytomy
时,应用程序启动得很好
@ManyToMany(fetch=FetchType.EAGER)
@可接合(
name=“A到B”,
joinColumns=@JoinColumn(name=“KEY\u A”,
referencedColumnName=“KEY”),
inverseJoinColumns={@JoinColumn(name=“KEY_B”,
referencedColumnName=“KEY”),
@JoinCokumn(name=“SOME_DATE”,
referencedColumnName=“开始日期”)})
私人名单;
但这不会给我想要的结果。我只想将A_\u B
和TABLE_B
加入KEY_B
,对于任何有类似问题的人,我最后做的是:
我在瞬态中列出了Bs,这意味着它不保存在DB中。然后我懒散地通过getter填充它:
@Entity
@Configurable
@Table(name = "TABLE_A")
public class TableA {
@Id
@Column(name = "KEY", nullable = false)
private int key;
@Transient
private List<TableB> listOfBs;
@Transient
@Autowired
AtoBRepository aToBRepository;
@Transient
@Autowired
TableBRepository tableBRepository;
public List<TableB> getListOfBs(){
if (listOfBs == null){
listOfBs = new ArrayList<>();
List<AtoB> AtoBs = aToBRepository.findByIdKeyA(key);
for (AtoB aToB : AtoBs){
listOfBs.addAll(tableBRepository.findByIdKey(aToB.getKeyB));
}
}
return listOfBs;
}
/* More Fields, Getters and setters*/
}
@实体
@可配置
@表(name=“表A”)
公共类表格{
@身份证
@列(name=“KEY”,nullable=false)
私钥;
@短暂的
私人名单;
@短暂的
@自动连线
原子性;原子性;
@短暂的
@自动连线
TableBRepository TableBRepository;
公共列表getListOfBs(){
if(listOfBs==null){
listOfBs=新的ArrayList();
列表您可以使用从数据库创建实体类吗?类似这样的方法谢谢您的建议。我在Dali中尝试过。关系的配置对话框还请求PK:键
和开始日期