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ABAP系统变量SY-INDEX与SY-TABIX差异点

石头 3月 27, 2017 其他 9,835 views 0

ABAP系统变量SY-INDEX与SY-TABIX都是用来记录循环的次数。但是SY-INDEX在do...endo和while...endwhile中起作用，而SY-TABIX在loop...endloop中有效。

测试代码：

REPORT ztest_index_tabix.

DATA:lit_vbak TYPE STANDARD TABLE OF vbak,
     lwa_vbak TYPE vbak.
DATA:l_flag TYPE c.

SELECT *
  FROM vbak
  INTO TABLE lit_vbak
    UP TO 5 ROWS.
WRITE:/ 'Loop...Endloop'.
LOOP AT lit_vbak INTO lwa_vbak.
  WRITE:/ 'SY-INDEX:', sy-index, 'SY-TABIX', sy-tabix.
ENDLOOP.


WRITE:/ 'Do...EndDo'.
DO 5 TIMES.
  WRITE:/ 'SY-INDEX:', sy-index, 'SY-TABIX', sy-tabix.
ENDDO.

WRITE:/ 'WHILE...EndWhile'.
WHILE l_flag < 5.
  WRITE:/ 'SY-INDEX:', sy-index, 'SY-TABIX', sy-tabix.
  l_flag = l_flag + 1.
ENDWHILE.