!符号的含义 - 金刀无敌王元霸

以ZTEST29的flow logic为例，!符号代表区分系统变量名称和自定义的名称。

 

F1中查看!可以看到示例：

FORM test USING !CHANGING
          CHANGING !USING.
  using = changing.
ENDFORM.

 

附:ZTEST29

*&---------------------------------------------------------------------*
*& Report  ZTEST29
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*
REPORT ztest29.

DATA: gt_sbook TYPE TABLE OF sbook.
DATA: gs_sbook TYPE sbook.

FIELD-SYMBOLS <fs> TYPE STANDARD TABLE.
ASSIGN gt_sbook TO <fs>.

SELECTION-SCREEN BEGIN OF BLOCK blk1.
PARAMETERS p_test LIKE ekko-zywlx.
SELECTION-SCREEN END OF BLOCK blk1.

INITIALIZATION.
  MESSAGE \'INITIALIZATION\' TYPE \'S\'.

AT SELECTION-SCREEN OUTPUT.
  MESSAGE \'AT SELECTION-SCREEN OUTPUT\' TYPE \'S\'.

AT SELECTION-SCREEN.
  MESSAGE \'AT SELECTION-SCREEN\' TYPE \'S\'.

START-OF-SELECTION.
  MESSAGE \'START-OF-SELECTION\' TYPE \'S\'.
  PERFORM action.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_test.
  MESSAGE \'AT SELECTION-SCREEN ON VALUE-REQUEST\' TYPE \'S\'.

END-OF-SELECTION.
  MESSAGE \'END-OF-SELECTION\' TYPE \'S\'.

FORM action.
  SELECT * UP TO 2 ROWS
  FROM sbook
  INTO TABLE gt_sbook.

  gs_sbook-carrid = \'001\'.
  gs_sbook-passname = \'test\' && p_test.
  APPEND gs_sbook TO <fs>.

  LOOP AT <fs> INTO gs_sbook.
    WRITE:
      / gs_sbook-carrid,
      / gs_sbook-passname.
  ENDLOOP.

ENDFORM.