ABAP——动态SQL

效果：

代码：

************************************************************************
* Program Name      :
* Descriptions      :
* T-Code            :
* Updates Tables    :
* Input  Parameters :
* Output Parameters :
* Return Codes      :
* Special Logic     :
* Includes          :
************************************************************************
* Modification Log
************************************************************************
*   Date   Ver. Programmer   Descriptions
* -------- ---- ------------ -------------------------------------------
* 2020 3.9     xxx    Create
*
************************************************************************
REPORT  ZPPRTEST.
***********************************************************************
* Tables Definitions
************************************************************************
*TABLES:.
************************************************************************
* Data Definitions
************************************************************************

************************************************************************
* Includes Module
************************************************************************

************************************************************************
* Selection Screen
************************************************************************
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE TEXT-b01.
PARAMETERS: p_num(2) TYPE n DEFAULT '6' OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b1.

************************************************************************
* Initialization
************************************************************************
INITIALIZATION.

************************************************************************
* At Selection Screen
************************************************************************
AT SELECTION-SCREEN.

************************************************************************
* At Selection Screen Output
************************************************************************
AT SELECTION-SCREEN OUTPUT.

************************************************************************
* Report Format
************************************************************************
TOP-OF-PAGE.

END-OF-PAGE.
************************************************************************
* Main Process
************************************************************************
START-OF-SELECTION.
  PERFORM get_data.

END-OF-SELECTION.

*&---------------------------------------------------------------------*
*&      Form  GET_DATA
*&---------------------------------------------------------------------*
FORM get_data.
  DATA: l_vgw      LIKE plpo-vgw01,
        l_sql(500) TYPE c,
        l_num TYPE i,
        l_numc TYPE String.

*  l_sql = 'SUM( plpo~vgw01 + plpo~vgw02 )'.

  DO p_num TIMES.
    l_num = l_num + 1.
    l_numc = l_num.
    IF l_num < 9.
      CONCATENATE l_sql ' plpo~vgw0' l_numc '+' INTO l_sql.
    ELSE.
      CONCATENATE l_sql ' plpo~vgw' l_numc '+' INTO l_sql.
    ENDIF.
  ENDDO.
  "去掉末尾+
  l_sql = SUBSTRING(  VAL = l_sql LEN = STRLEN( l_sql ) - 1 ) .
  CONCATENATE 'SUM(' l_sql ' )' INTO l_sql.

  SELECT (l_sql) INTO @l_vgw
            FROM plpo
            INNER JOIN plas ON  plpo~plnnr = plas~plnnr
            AND plpo~plnkn = plas~plnkn
            WHERE plas~loekz = @space
            AND plpo~plnnr = '50033934'
            AND plpo~vornr = '0040'.
  ENDSELECT.

*  SELECT SUM( plpo~vgw01 + plpo~vgw02 ) INTO @l_vgw
*            FROM plpo
*            INNER JOIN plas ON  plpo~plnnr = plas~plnnr
*            AND plpo~plnkn = plas~plnkn
*            WHERE plas~loekz = @space
*            AND plpo~plnnr = '50033934'
*            AND plpo~vornr = '0040'.

  cl_demo_output=>write( l_sql ).
  cl_demo_output=>write( l_vgw ).
  cl_demo_output=>display(  ).
ENDFORM.                "GET_DATA