java - 如何将sql native 查询结果映射到spring jpa存储库中的DTO？

Question

嗨，我想要实现的是将 SQL native 查询结果映射到 java spring jpa 存储库中的 DTO 中，我该如何正确执行此操作？我尝试了几个代码，但它不起作用，这是我尝试过的:
第一次尝试 :

@Repository
public interface StockRepository extends RevisionRepository<Stock, Long, Integer>, JpaRepository<Stock, Long> {
    
   @Query(value = "SELECT stock_akhir.product_id AS productId, stock_akhir.product_code AS productCode, SUM(stock_akhir.qty) as stockAkhir "
        + "FROM book_stock stock_akhir "
        + "where warehouse_code = (:warehouseCode) "
        + "AND product_code IN (:productCodes) "
        + "GROUP BY product_id, product_code, warehouse_id, warehouse_code", nativeQuery = true)
   List<StockAkhirDto> findStockAkhirPerProductIn(@Param("warehouseCode") String warehouseCode, @Param("productCodes") Set<String> productCode);
}

执行该函数后，出现此错误:

No converter found capable of converting from type[org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap]to type [com.b2bwarehouse.Dto.RequestDto.StockDto.StockAkhirDto]

第二次尝试:

@Repository
public interface StockRepository extends RevisionRepository<Stock, Long, Integer>, JpaRepository<Stock, Long> {
    
   @Query(value = "SELECT new com.b2bwarehouse.Dto.RequestDto.StockDto.StockAkhirDto(stock_akhir.product_id AS productId, stock_akhir.product_code AS productCode, SUM(stock_akhir.qty) as stockAkhir) "
      + "FROM book_stock stock_akhir "
      + "where warehouse_code = (:warehouseCode) "
      + "AND product_code IN (:productCodes) "
      + "GROUP BY product_id, product_code, warehouse_id, warehouse_code", nativeQuery = true)
   List<StockAkhirDto> findStockAkhirPerProductIn(@Param("warehouseCode") String warehouseCode, @Param("productCodes") Set<String> productCode);
}

第二个是错误:

could not extract ResultSet; SQL [n/a]; nested exception isorg.hibernate.exception.SQLGrammarException: could not extractResultSet

下面是我的 DTO:

@Data
@AllArgsConstructor
@NoArgsConstructor
public class StockAkhirDto {
   private Long productId;
   private String productCode;
   private Integer stockAkhir;
}

我应该如何更正我的代码？那么，我可以将结果输入到我的 DTO 中吗？

Answer 1

您可以使用适当的 sql 结果集映射定义以下命名 native 查询:

import javax.persistence.NamedNativeQuery;
import javax.persistence.SqlResultSetMapping;
import javax.persistence.ConstructorResult;
import javax.persistence.ColumnResult;

@Entity
@NamedNativeQuery(
    name = "find_stock_akhir_dto",
    query =
        "SELECT " + 
        "  stock_akhir.product_id AS productId, " + 
        "  stock_akhir.product_code AS productCode, " + 
        "  SUM(stock_akhir.qty) as stockAkhir " + 
        "FROM book_stock stock_akhir " + 
        "where warehouse_code = :warehouseCode " + 
        "  AND product_code IN :productCodes " + 
        "GROUP BY product_id, product_code, warehouse_id, warehouse_code",
    resultSetMapping = "stock_akhir_dto"
)
@SqlResultSetMapping(
    name = "stock_akhir_dto",
    classes = @ConstructorResult(
        targetClass = StockAkhirDto.class,
        columns = {
            @ColumnResult(name = "productId", type = Long.class),
            @ColumnResult(name = "productCode", type = String.class),
            @ColumnResult(name = "stockAkhir", type = Integer.class)
        }
    )
)
public class SomeEntity
{
}

然后使用它:

@Repository
public interface StockRepository extends RevisionRepository<Stock, Long, Integer>, JpaRepository<Stock, Long> {

   @Query(name = "find_stock_akhir_dto", nativeQuery = true)
   List<StockAkhirDto> findStockAkhirPerProductIn(
      @Param("warehouseCode") String warehouseCode,
      @Param("productCodes") Set<String> productCode
   );
}