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[英]CrudRepository, cant save entity with a composite primary key using IdClass
[英]"incorrect PK" : delete operation on CrudRepository for entity annotated with @IdClass
当我的服务调用repository.delete(myEntity)
,我收到以下错误:
105 | 您为此查找操作提供了不正确的 PK 类的实例。 预期类:com.foo.PrimaryKey 类,接收到的类:java.lang.String 类。
存储库接口extends CrudRepository<MyEntity, PrimaryKey>
。
我在@Entity
类上使用@IdClass(PrimaryKey.class)
并用@Id
标记相关的单个字段。 PrimaryKey
有一个字段,它是一个String
。 我们这样做是为了保持我们的代码库一致,以便每个@Entity
始终将其主键声明为复合键。
出于某种原因,JPA 在内部调用em.find(MyEntity.class, primaryKeyString)
而不是从该 String 构建PrimaryKey
实例并使用它,因此出现错误。
当我尝试调用repository.deleteById(correspondingPrimaryKeyInstance)
时会发生同样的错误。
这来自org.springframework.data.jpa.repository.support.SimpleJpaRepository
,我在事情失败的地方添加了一条评论:
@Override
@Transactional
@SuppressWarnings("unchecked")
public void delete(T entity) {
Assert.notNull(entity, "Entity must not be null!");
if (entityInformation.isNew(entity)) {
return;
}
Class<?> type = ProxyUtils.getUserClass(entity);
T existing = (T) em.find(type, entityInformation.getId(entity)); // IT FAILS HERE... `entityInformation.getId(entity)` returns a String instead of the expected `PrimaryKey`
// if the entity to be deleted doesn't exist, delete is a NOOP
if (existing == null) {
return;
}
em.remove(em.contains(entity) ? entity : em.merge(entity));
}
public interface MyEntityCRUDRepository extends CrudRepository<MyEntity, PrimaryKey> { }
public interface MyEntityCustomRepository { /* some custom operations */ }
@Repository
public interface MyEntityRepository extends MyEntityCRUDRepository, MyEntityCustomRepository { }
@Service
@Transactional(rollbackFor = Exception.class)
@RequiredArgsConstructor
public class MyEntityService {
private final MyEntityRepository repository;
public void destroy(final PrimaryKey pk) {
// repository.deleteById(pk); // also returns the error
MyEntity myEntity = repository.findById(pk)
.orElseThrow(() -> new IllegalArgumentException(DOES_NOT_EXIST));
repository.delete(myEntity); // returns the error
}
}
@Entity
@Table(name = "myentity")
@JsonIgnoreProperties(ignoreUnknown = true)
@Data
@NoArgsConstructor
@AllArgsConstructor
@IdClass(PrimaryKey.class)
public class MyEntity {
@Id
@Column(name = "the_id", updatable = false)
private String theId;
// other fields which aren't part of the primary key
}
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class PrimaryKey implements Serializable {
private String theId;
}
临时修复:当您只有一个作为 ID 的属性时,不要使用@IdClass
。
@Entity
@Table(name = "myentity")
@JsonIgnoreProperties(ignoreUnknown = true)
@Data
@NoArgsConstructor
@AllArgsConstructor
//@IdClass(PrimaryKey.class)
public class TemporaryReservation {
@Id
@Column(name = "the_id", updatable = false)
private String theId;
// other fields which aren't part of the primary key
}
public interface MyEntityCRUDRepository extends CrudRepository<MyEntity, String> { }
更改后,在其余代码中进行适当调整。
原来这是Spring Data
一个错误。 请参阅相关(现已解决)问题: https : //github.com/spring-projects/spring-data-jpa/issues/2330 。
其中一位维护者说:
另一种解决方法是让您的实体实现
Persistable
。
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