ABAP 動態內表 取表結構信息 （轉自老白的ABAP博客）
REPORT z_barry_test .
TYPE-POOLS : abap.
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
<dyn_wa>,
<dyn_field>.
DATA: dy_table TYPE REF TO data,
dy_line TYPE REF TO data,
xfc TYPE lvc_s_fcat,
ifc TYPE lvc_t_fcat.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS: p_table(30) TYPE c DEFAULT 'T001'.
SELECTION-SCREEN END OF BLOCK b1.
START-OF-SELECTION.
PERFORM get_structure.
PERFORM create_dynamic_itab.
PERFORM get_data.
PERFORM write_out.
*---------------------------------------------------------------------*
* FORM get_structure *
*---------------------------------------------------------------------*
FORM get_structure.
DATA : idetails TYPE abap_compdescr_tab,
xdetails TYPE abap_compdescr.
DATA : ref_table_des TYPE REF TO cl_abap_structdescr.
ref_table_des ?=
cl_abap_typedescr=>describe_by_name( p_table ).
idetails[] = ref_table_des->components[].
LOOP AT idetails INTO xdetails.
CLEAR xfc.
xfc-fieldname = xdetails-name .
* xfc-datatype = xdetails-type_kind.
xfc-inttype = xdetails-type_kind.
xfc-intlen = xdetails-length + xdetails-decimals.
xfc-decimals = xdetails-decimals.
APPEND xfc TO ifc.
ENDLOOP.
ENDFORM. "get_structure
*---------------------------------------------------------------------*
* FORM create_dynamic_itab *
*---------------------------------------------------------------------*
FORM create_dynamic_itab.
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = ifc
IMPORTING
ep_table = dy_table.
ASSIGN dy_table->* TO <dyn_table>.
CREATE DATA dy_line LIKE LINE OF <dyn_table>.
ASSIGN dy_line->* TO <dyn_wa>.
ENDFORM. "create_dynamic_itab
*---------------------------------------------------------------------*
* FORM get_data *
*---------------------------------------------------------------------*
FORM get_data.
DATA: BEGIN OF itab OCCURS 0 .
INCLUDE STRUCTURE spfli.
DATA: END OF itab.
SELECT * INTO CORRESPONDING FIELDS OF TABLE <dyn_table>
FROM (p_table).
ENDFORM. "get_data
*---------------------------------------------------------------------*
* FORM write_out *
*---------------------------------------------------------------------*
FORM write_out.
LOOP AT <dyn_table> INTO <dyn_wa>.
DO.
ASSIGN COMPONENT sy-index
OF STRUCTURE <dyn_wa> TO <dyn_field>.
IF sy-subrc <> 0.
EXIT.
ENDIF.
IF sy-index = 1.
WRITE:/ <dyn_field>.
ELSE.
WRITE: <dyn_field>.
ENDIF.
ENDDO.
ENDLOOP.
ENDFORM. "write_out