我有一个变量，它应该确定我在进一步编译中使用结构的哪个字段。因此，假设我的变量被命名为货币，并且可以具有值"K"，"T"和"H"。在检查了它的值之后，我想使用相应的结构字段，例如mystructure-fieldk，mystructure-fieldt，mystructure-fieldi。
至于现在，我只使用IF.。然后检查我的可变货币的值，然后只使用结构的相应字段，但因此我必须重复我的循环编码 3 次，这太丑陋了。
LOOP AT itab ASSIGNING <fs>.
mystructure-fieldk = mystructure-fieldk + <fs>-otherfieldk.
ENDLOOP.
有没有办法将循环与动态字段一起使用？如： IF 货币 = 'K'。 DATA（mydynamicfield） = fieldk. 恩迪夫。然后在循环中使用MyDynamicfield：
LOOP AT itab ASSIGNING <fs>.
mystructure-mydynamicfield = mystructure-mydynamicfield + <fs>-otherfieldk.
ENDLOOP.
还是别的什么？多谢！
使用以下一段代码
LOOP AT ITAB ASSIGNING <fs-structure>.
*-- determination of field name logic goes here let's say you have
*-- field name is in variable lv_field
ASSIGN COMPONENT (lv_field) of STRUCTURE <fs-structure> to <fs-field>.
IF <fs-field> IS ASSIGNED.
<fs-field> = 'the value you want to assign'.
ENDIF.
ENDLOOP.
希望这能澄清。
假设您要基于相同结构中的其他字段进行计算
LOOP AT ITAB ASSIGNING <fs-structure>.
*-- determination of field name logic goes here let's say you have
*-- field name is in variable lv_field1 and other is lv_field2
ASSIGN COMPONENT (lv_field1) of STRUCTURE <fs-structure> to <fs-field1>.
ASSIGN COMPONENT (lv_field2) of STRUCTURE <fs-structure> to <fs-field2>.
IF <fs-field1> IS ASSIGNED ANDV<fs-field2> IS ASSIGNED .
<fs-field1> = <fs-field1> + <fs-field1>.
ENDIF.
ENDLOOP.
注意：编写代码是为了给出如何进一步处理此问题的想法。正如Sandra指出的那样，这可能会导致编译问题，请根据需要进行更正。我尝试仅回答发行移动设备的问题。我目前无法访问编译器/系统。
对
组件的静态引用性能更好：
TYPES: BEGIN OF ty_structure,
fieldk TYPE i,
fieldt TYPE i,
fieldh TYPE i,
END OF ty_structure.
DATA: itab TYPE TABLE OF ty_structure,
mystructure TYPE ty_structure,
currency TYPE c LENGTH 1.
LOOP AT itab ASSIGNING FIELD-SYMBOL(<fs>).
CASE currency.
WHEN 'K'. ADD <fs>-fieldk TO mystructure-fieldk.
WHEN 'T'. ADD <fs>-fieldt TO mystructure-fieldt.
WHEN 'H'. ADD <fs>-fieldh TO mystructure-fieldh.
ENDCASE.
ENDLOOP.
如果要简化代码，可以使用宏（内联代码）：
LOOP AT itab ASSIGNING FIELD-SYMBOL(<fs>).
DEFINE m_add.
IF currency = 'K'.
ADD <fs>-field&1 TO mystructure-field&1.
ENDIF.
END-OF-DEFINITION.
m_add : K, T, H.
ENDLOOP.
我用数据创建了工作示例。我相信，这肯定会对你有所帮助。计算动态字段值，并在末尾显示结果。
TYPES: BEGIN OF ty_itab,
currency TYPE c,
fieldk TYPE i,
fieldt TYPE i,
fieldh TYPE i,
END OF ty_itab.
TYPES: BEGIN OF ty_structure,
fieldk TYPE i,
fieldt TYPE i,
fieldh TYPE i,
END OF ty_structure.
DATA: itab TYPE TABLE OF ty_itab,
ls_structure TYPE ty_structure.
itab = VALUE #( ( currency = 'H' fieldk = 10 fieldt = 20 fieldh = 30 )
( currency = 'H' fieldk = 50 fieldt = 60 fieldh = 70 )
( currency = 'T' fieldk = 100 fieldt = 120 fieldh = 150 )
( currency = 'K' fieldk = 300 fieldt = 400 fieldh = 500 ) ).
LOOP AT itab ASSIGNING FIELD-SYMBOL(<fs>).
CASE <fs>-currency.
WHEN 'K'. ADD <fs>-fieldk TO ls_structure-fieldk.
WHEN 'T'. ADD <fs>-fieldt TO ls_structure-fieldt.
WHEN 'H'. ADD <fs>-fieldh TO ls_structure-fieldh.
ENDCASE.
ENDLOOP.
cl_demo_output=>display( ls_structure ).
您可以尝试使用以下代码：
TYPES: BEGIN OF ts_basic_line,
matnr TYPE mara-matnr,
lifnr TYPE lfa1-lifnr,
END OF ts_basic_line,
ty_basic_line TYPE TABLE OF ts_basic_line.
DATA: lt_basic_data TYPE ty_basic_line,
lo_structure TYPE REF TO cl_abap_structdescr,
lt_components TYPE abap_component_tab.
lt_basic_data = VALUE #( ( matnr = '111' lifnr = '333' ) ). " data for test
READ TABLE lt_basic_data ASSIGNING FIELD-SYMBOL(<fs_line>) INDEX 1.
IF sy-subrc EQ 0.
lo_structure ?= cl_abap_typedescr=>describe_by_data( <fs_line> ).
lt_components = lo_structure->get_components( ).
LOOP AT lt_components ASSIGNING FIELD-SYMBOL(<fs_strucutre_fields>).
LOOP AT lt_basic_data ASSIGNING FIELD-SYMBOL(<fs_data>).
ASSIGN COMPONENT <fs_strucutre_fields>-name OF STRUCTURE <fs_data> TO FIELD-SYMBOL(<fs_value>).
IF sy-subrc EQ 0.
" here your code, e.x. data conversion
<fs_value> = |{ <fs_value> ALPHA = IN }|.
ENDIF.
ENDLOOP.
ENDLOOP.
ENDIF.