Question

我的存储库

 public interface ProductRepository extends JpaRepository<Product,Integer> {


           @Query(value = "select mp.*,u.name,p.name, p.ext_id from merchant_product mp join campaign c on c.product_id = mp.id and c.status in (4, 8)join product p on p.id = mp.product_id join user u on u.id = mp.user_id where mp.status = 4 and mp.availability = 'Y';", nativeQuery = true)

            List<Object> getAllProduct();

    }

这是我在Spring Boot中的查询我正在使用Spring数据JPA。我需要将它映射到Pojo类。这样我就可以用它来进一步处理。

任何人都可以帮助我。

我的pojo

@Data
@AllArgsConstructor
public class Product {
    @Id
    //data of merchant product table
    //data of user table
    private int id;
    private String name;
    private String ext_id;


}

Answer 1

@Query(nativeQuery = true, name = "test", value = "select mp.* ...")
@SqlResultSetMapping(name="test", classes = {
        @ConstructorResult(targetClass = Product.class,
                columns = {@ColumnResult(name="name"), @ColumnResult(name="id")}, @ColumnResult(name="ext_id")})
})

添加SqlResultSetMapping以初始化映射对应于Pojo字段的查询中的哪些列

Answer 2

我在Product和call -

上为你想要的参数创建一个构造函数

 public interface ProductRepository extends JpaRepository<Product,Integer> {
           @Query(value = "select new Product(u.name,p.name, p.ext_id) from merchant_product mp join campaign c on c.product_id = mp.id and c.status in (4, 8)join product p on p.id = mp.product_id join user u on u.id = mp.user_id where mp.status = 4 and mp.availability = 'Y';", nativeQuery = true)
            List<Product> getAllProduct();    
    }

您需要在对象中定义通配符mp。*中的参数以进行映射

如何将复杂的本机查询结果集映射到Spring Data JPA中的Pojo类

2 个答案: