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[英]Spring Data JPA and Projection getting ConverterNotFoundException for TupleConverter
[英]JPA projection getting results but not matching the columns with the methods in the interface view
我在 spring boot 項目中使用 jpa 投影來獲取一些值。 我有以下表格:
create table `rental_contract`
(
`rental_contract_id` bigint(20) not null,
`object_id` bigint(20) default null,
`property_id` bigint(20) default null,
primary key (rental_contract_id),
foreign key (property_id, object_id) references property_object (property_id, object_id)
);
以下實體:
@Entity
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@NamedEntityGraph(
name = "RentalContract.WithPropertyObjects",
attributeNodes = {
@NamedAttributeNode(value = "propertyObject", subgraph =
"RentalContract.WithPropertyObjects.Properties")
},
subgraphs = {
@NamedSubgraph(name = "RentalContract.WithPropertyObjects.Properties",
attributeNodes = {
@NamedAttributeNode(value = "property")
})
}
)
public class RentalContract {
@Id
private Long rentalContractId;
@JoinColumns({
@JoinColumn(name = "object_id"),
@JoinColumn(name = "property_id"),
})
@ManyToOne(fetch = FetchType.LAZY)
private PropertyObject propertyObject;
}
存儲庫:
public interface RentalContractRepository extends JpaRepository<RentalContract, Long> {
Optional<RentalContract>
findByPropertyObject_ObjectIdAndPropertyObject_Property_PropertyId(Long objectId, Long
propertyId);
@Override
@EntityGraph(value = "RentalContract.WithPropertyObjects")
List<RentalContract> findAll();
@Query(value = "SELECT * from rental_contract", nativeQuery = true)
List<RentalContractView> getAllWithObjectsAndProperties();
}
觀點是:
public interface RentalContractView {
Long getRentalContractId();
Long getObjectId();
Long getPropertyId();
}
當我調用存儲庫方法時,我可以看到我正在獲取結果和確切數字,但是在調用方法getRentalContractId()
時,即使應該有一個值(在數據庫中檢查)和另外兩個值,我也得到了空值未映射字段。
我也嘗試過創建類並映射它們,但仍然無法正常工作。
您必須為列提供別名以匹配界面中的名稱:
@Query(value = "SELECT " +
"rental_contract_id as rentalContractId " +
"object_id as objectId " +
"property_id as propertyId" +
"from rental_contract", nativeQuery = true)
沒有命名策略,因為您沒有使用實體。
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