ABAP开发：如何在Loop循环中访问嵌套内表字段fstyl-style？

Hey there! Let's sort out how to correctly access the style field in your fstyl table. The key issue here is that fstyl is defined as an internal table (lvc_t_styl is a standard table type for ALV cell styles), not a single structure—so you can't directly reference wa_main-fstyl-style like you would with a regular field.

Here are two common ways to handle this, depending on your use case:

1. Loop through all style entries in each main record #

If each ty_main entry might have multiple style records, you'll need to nest a loop to iterate through the fstyl table inside your main loop:

TYPES: BEGIN OF ty_main,
         bukrs LIKE bseg-bukrs,
         fstyl TYPE lvc_t_styl,
       END OF ty_main.

DATA: it_main TYPE TABLE OF ty_main,
      wa_main LIKE LINE OF it_main,
      wa_fstyl LIKE LINE OF wa_main-fstyl. " Work area for the style table entries

LOOP AT it_main INTO wa_main.
  " Loop through the style table inside each main record
  LOOP AT wa_main-fstyl INTO wa_fstyl WHERE style = cl_gui_alv_grid=>mc_style_disabled.
    " Add your processing logic here (e.g., log, modify, display)
    WRITE: / wa_main-bukrs, wa_fstyl-style.
  ENDLOOP.
ENDLOOP.

2. Read a single style entry (if only one exists per main record) #

If you're sure each ty_main entry has exactly one style record, use READ TABLE to fetch that single entry:

TYPES: BEGIN OF ty_main,
         bukrs LIKE bseg-bukrs,
         fstyl TYPE lvc_t_styl,
       END OF ty_main.

DATA: it_main TYPE TABLE OF ty_main,
      wa_main LIKE LINE OF it_main,
      wa_fstyl LIKE LINE OF wa_main-fstyl.

LOOP AT it_main INTO wa_main.
  " Read the first (and only) entry from the style table
  READ TABLE wa_main-fstyl INTO wa_fstyl INDEX 1.
  IF sy-subrc = 0 AND wa_fstyl-style = cl_gui_alv_grid=>mc_style_disabled.
    " Your processing logic here
    WRITE: / wa_main-bukrs, wa_fstyl-style.
  ENDIF.
ENDLOOP.

A quick reminder: lvc_t_styl is based on the structure lvc_s_styl, which includes fields like style, fieldname, and row_id. You always need to work with individual entries of this internal table—you can't access fields directly from the table itself.

内容的提问来源于stack exchange，提问作者ekekakos