如何使用@EmbeddedId或@Id密钥对象（不使用IdClass）查询复合主键的子集？

Question

Spring Data JPA如何支持查询主键的子集？或者我是否需要为此实现自定义存储库方法？

有这样的课程：

@lombok.Data
@lombok.NoArgsConstructor
@lombok.AllArgsConstructor
@Entity
@Table(name = "my_entity")
class MyEntity {
    @EmbeddedId
    private Pk id;

    public Pk getId() {
        return id;
    }

    public void setId(Pk id) {
        this.id = id;
    }

}

@lombok.Data
@lombok.NoArgsConstructor
@lombok.AllArgsConstructor
@Embeddable
 class Pk implements Serializable {
    private Integer type;
    private String userId;


}

interface MyEntityRepository extends org.springframework.data.jpa.repository.JpaRepository<MyEntity, Pk> {

    java.util.Set<MyEntity> findAllByUserId(String userId);

}

在启动我的Spring Boot应用程序时，我收到错误：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myEntityRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property user found for type MyEntity!
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1512)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:615)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:73)
    at com.myproject.backend.common.ServiceContext.start(ServiceContext.java:293)
    at com.myproject.run(AbstractServiceContainer.java:55)
    at com.myproject..run(AbstractServiceContainer.java:1)
    at io.dropwizard.cli.EnvironmentCommand.run(EnvironmentCommand.java:42)
    at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:76)
    at io.dropwizard.cli.Cli.run(Cli.java:70)
    at io.dropwizard.Application.run(Application.java:72)
    at com.myproject..main(CombinedServiceContainer.java:106)
    Caused by: org.springframework.data.mapping.PropertyReferenceException: No property user found for type MyEntity!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:75)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:359)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:270)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:241)
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76)
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:213)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:321)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:301)
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:85)
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:60)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:91)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:168)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:69)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:320)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:169)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:224)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:210)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1571)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1509)
    ... 18 more

类似问题

IdClass解决方案

这与问题here类似，应该在那里得到解答，除了OP决定通过使用IdClass进入解决方案的另一条路线。虽然该解决方案有效但这个问题是为了表明没有做IdClass的支持方式。

按示例解决方案查询

This answer显示如何使用“按示例查询”执行此操作，这对于复合键的多个部分非常有用。

此问题与链接的答案不同，因为链接的答案显示如何通过编写查询方法名称来解决问题。这个问题询问如何通过在查询注释中编写SQL或HQL字符串来解决问题。

Answer 1

只需自己定义查询：

@Query("select me from MyEntity me where me.id.userId = ?1")
java.util.Set<MyEntity> findAllByUserId(String userId);