java - 具有 SqlResultSetMapping 和 native 查询的 JPA 数据存储库

Question

我遇到了以下情况:

我的实体彼此相关，但是我无法使用 JPQL。我被迫使用 native SQL。现在我想将这些结果映射到一个 ValueObject。需要明确的是，我不想获取 Object 数组( List<Object[]> )的列表。我有 6 个实体，我只需要其中的一些列。谁能给我一个关于如何从 native 查询实现这种映射的示例？

Tutorial我经历过的。

我的代码:

@SqlResultSetMapping(
    name = "findAllDataMapping",
    classes = @ConstructorResult(
            targetClass = MyVO.class,
            columns = {
                    @ColumnResult(name = "userFirstName"),
                    @ColumnResult(name = "userLastName"),
                    @ColumnResult(name = "id"),
                    @ColumnResult(name = "packageName")
            }
    )
)

@NamedNativeQuery(name = "findAllDataMapping",
    query = "SELECT " +
            "    u.first_name as userFirstName, " +
            "    u.last_name as userLastName, " +
            "    i.id as id, " +
            "    s.title as packageName, " +
            "FROM " +
            "    invoice as i " +
            "JOIN user as u on i.user_id=u.id " +
            "LEFT JOIN subscription_package as s on i.subscription_package_id=s.id " +
            "where  u.param1=:param1 and i.param2=:param2" +
)

public class MyVO {
    private String userFirstName;
    private String userLastName;
    private Long id;
    private String packageName;

    public MyVO (String userFName, String userLName,
            Long id, String packageName) {
        this.userFirstName = userFName;
        this.userLastName = userLName;
        this.id = id;
        this.packageName = packageName;
    }

    // getters & setters
}

在我的 jpa-repository 模块中:

public interface MyRepository extends JpaRepository<MyEntity, Long> {
    List<MyVO> findAllOfMyVO(@Param("param1") String param1, @Param("param2") String param2);
}

关键是我不知道将这些注释放在哪里，所以我可以使用这种映射。在 native 查询中，我不能使用 new rs.rado.leo.mypackage.MyVO(...) .我收到以下错误:

原因:

org.springframework.data.mapping.PropertyReferenceException: No property findAllOfMyVO found for type MyEntity!

我想我的问题很清楚。如果没有，请告诉我，以便我编辑我的问题。

提前致谢!

Answer 1

添加缺少的结果类

@NamedNativeQuery(name = "findAllDataMapping", resultClass = Entity.class, query="sql")

或者

@NamedNativeQuery(name = "findAllDataMapping", resultClass = MyVO.class, resultSetMapping ="findAllDataMapping" query = "sql")

最后在你的存储库中调用查询

@Query(nativeQuery = true, name = "findAllDataMapping")
List<MyVO> findAllOfMyVO(@Param("param1") String param1, @Param("param2") String param2);