使用主键定义实体的spring-data JPA存储库接口，主键也是JPA 2.x中的外键-Java 学习之路

我有一个JPA 2.x定义主键的实体，它也是另一个实体的外键（对于 @*ToOne 关系字段的 @Id 注释，JPA 2.x allows）：

@Entity
class FooOptionalInfo {
    /* ... fields ... */

    @Id
    @OneToOne
    public Foo getFoo() { return foo; }

    /* ... setters ... */
}

@Entity
class Foo {
    @Id
    public Long fooId;

    /* ... getters/setters ... */
}

Spring JPA存储库接口应该扩展 Repository<T, ID> 接口，其中 T 是 @Entity 类， ID 是实体的 @Id 字段，但是：

在spring jpa初始化时，定义 public interface FooOptionalInfoRepository extends Repository<Foo, Bar> 或 extends Repository<FooOptionalInfo, Long> 会产生相同的错误：

Caused by: java.lang.IllegalArgumentException: This class [class com.example.FooOptionalInfo] does not define an IdClass
    at org.hibernate.jpa.internal.metamodel.AbstractIdentifiableType.getIdClassAttributes(AbstractIdentifiableType.java:183)
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation$IdMetadata.<init>(JpaMetamodelEntityInformation.java:253)
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:84)
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:68)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:153)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:100)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:82)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:199)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
    ... 20 common frames omitted

Do I need to revert back to JPA 1.x standards and define both the Entity and the basic id field (@Id Long fooId; @OneToOne @PrimaryKeyJoinColumn(...) Foo foo; in FooOptionalInfo) or is there a way to eat the JPA 2.x simplified annotations and have my spring repository cake as well?

1 回答

对于 id 同时成为主键和外键来说，这是一个奇怪的垃圾 . 您可以通过另一种方式完成此操作：在 Bar 中定义外键 .

@Entity
class Foo {
    @Id
    private long id;
    // ...
}

@Entity
class Bar {
    @Id
    public Long barId;

    @OneToOne
    @JoinColumn(name="foo_id")
    private Foo foo;
}

回复于 2024-04-30T01:40:00+08:00

使用主键定义实体的spring-data JPA存储库接口，主键也是JPA 2.x中的外键

1 回答

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