Abap 用户单击按钮并将字段放入屏幕上的表格后，如何返回字段？

我想知道程序如何从表中提取信息并将其显示在表的屏幕上？

这里有一个简单的报告示例，用于在ALV表中显示SAP中的数据：

TYPE-POOLS: slis.  " SLIS contains all the ALV data types
*&---------------------------------------------------------------------*
*& Data Declaration
*&---------------------------------------------------------------------*
DATA: it_sbook     TYPE TABLE OF sbook.
DATA: it_fieldcat  TYPE slis_t_fieldcat_alv,
      wa_fieldcat  TYPE slis_fieldcat_alv.
*&---------------------------------------------------------------------*
*& START-OF-SELECTION
*&---------------------------------------------------------------------*
START-OF-SELECTION.

*Fetch data from the database
  SELECT * FROM sbook INTO TABLE it_sbook.

*Build field catalog
  wa_fieldcat-fieldname  = 'CARRID'.    " Fieldname in the data table
  wa_fieldcat-seltext_m  = 'Airline'.   " Column description in the output
  APPEND wa_fieldcat TO it_fieldcat.

  wa_fieldcat-fieldname  = 'CONNID'.
  wa_fieldcat-seltext_m  = 'Con. No.'.
  APPEND wa_fieldcat TO it_fieldcat.

  wa_fieldcat-fieldname  = 'FLDATE'.
  wa_fieldcat-seltext_m  = 'Date'.
  APPEND wa_fieldcat TO it_fieldcat.

  wa_fieldcat-fieldname  = 'BOOKID'.
  wa_fieldcat-seltext_m  = 'Book. ID'.
  APPEND wa_fieldcat TO it_fieldcat.

  wa_fieldcat-fieldname  = 'PASSNAME'.
  wa_fieldcat-seltext_m  = 'Passenger Name'.
  APPEND wa_fieldcat TO it_fieldcat.

*Pass data and field catalog to ALV function module to display ALV list
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      it_fieldcat   = it_fieldcat
    TABLES
      t_outtab      = it_sbook
    EXCEPTIONS
      program_error = 1
      OTHERS        = 2.

还请检查一些基本的

可能的副本