abap - 使用 CORRESPONDING without LOOP 对平面结构进行映射

Question

我使用的是 ABAP 7.4 SP13。

我想在下面的代码中使用“选项 2”，但是如何进行这种深度映射？这里的目标是有一个干净、简单、易于阅读的映射，避免循环。

TYPES:
    BEGIN OF ty_s_audit,                   
      CreatedBy           TYPE ernam,
      LastChangedBy       TYPE aenam,
    END OF ty_s_audit,
    BEGIN OF ty_s_equipment,
      EquipmentId           TYPE equi-equnr,
      Audit                 TYPE ty_s_audit BOXED,
    END OF ty_s_equipment,
    ty_t_equipment TYPE STANDARD TABLE OF ty_s_equipment WITH KEY PRIMARY_KEY COMPONENTS EquipmentId.

DATA: lt_equipments TYPE ty_t_equipment.

  SELECT equnr, ernam, aenam FROM equi INTO TABLE @DATA(lt_equi).

  "Option 1:
  LOOP AT lt_equi ASSIGNING FIELD-SYMBOL(<ls_equi>).
    APPEND INITIAL LINE TO lt_equipments ASSIGNING FIELD-SYMBOL(<ls_equipment>).

    <ls_equipment> = CORRESPONDING #( <ls_equi> MAPPING EquipmentId = EQUNR ).

    <ls_equipment>-Audit = CORRESPONDING #( <ls_equi> MAPPING CreatedBy     = ERNAM
                                                              LastChangedBy = AENAM ).
  ENDLOOP.

  "Option 2:
  lt_equipments = CORRESPONDING #( lt_equi MAPPING EquipmentId          = EQUNR
                                                   “Audit-CreatedBy     = ERNAM
                                                   “Audit-LastChangedBy = AENAM ).

Answer 1

那么，下面的解决方案呢？

lt_equipments = VALUE #( FOR i IN lt_equi
  (
    equipmentid = i-equnr
    audit-createdby = i-ernam
    audit-lastchangedby = i-aenam
  )
).

或者，如果您真的想在某处使用 CORRESPONDING MAPPING，那么例如。

lt_equipments = VALUE #( FOR i IN lt_equi
  (
    equipmentid = i-equnr
    audit = CORRESPONDING #( i MAPPING createdby = ernam lastchangedby = aenam )
  )
).