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我在使用@SqlResultSetMapping 和@NamedNativeQuery 时遇到了一个奇怪的错误。

我的实体有：

@NamedNativeQuery(
        name = "example_query",
        query = "SELECT table_A.id, " +
                "COUNT(*) AS numberOfA " +
                "FROM table_A table_A " +
                "  JOIN example example ON example.id = :idExample " +
                "GROUP BY id " +
                "ORDER BY numberOfA DESC;",
        resultSetMapping = "myMapping"
)
@SqlResultSetMapping(
        name = "myMapping",
        classes = @ConstructorResult(
                targetClass = ExampleDTO.class,
                columns = {
                        @ColumnResult(name = "id", type = Integer.class),
                        @ColumnResult(name = "numberOfA", type = Integer.class)
                }
        )
)
public class Entity implements Serializable { /////// }

我的 DTO 是这样的：

public class ExampleDTO {

    private Integer id;
    private Integer numberOfA;

}

我的仓库：

public interface Entity extends JpaRepository<Entity,Integer> {

    @Query(name = "example_query", nativeQuery = true)
    List<ExampleDTO> findExampleQuery(@Param("id") Integer id);

}

在数据库上，相同的查询返回：

id     |      numberofa
 1               11
 2                5

并且映射返回一个对象：

id     |      numberofa
 1               154
 2                70

这怎么可能？

4

0 回答 0