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关于abap:ABAP-Workarea工作区-VS-Field-Symbols占位符-性能对比分析

在 SAP 开发我的项目,这两个概念开发人员根本都晓得。然而没有去比照其性能区别。
首先,咱们遍及一下原理。
Workarea: 相当于在内存堆栈外面开拓了一块内存。
Field Symbols: 相当于存了内存的地址。所以实际上是不占用内存的。相当于 C 语言的曾经被解除援用的指针。
所以咱们进行一项性能测试:
1. 比照单纯 Loop 的性能,不进行数据批改。

REPORT zloop_performance_test.


DATA : v_start_time TYPE timestampl,
       v_end_time   TYPE timestampl,
       v_diff_w     TYPE p DECIMALS 5.


TYPES : BEGIN OF ty_vbrp,
          vbeln TYPE vbrp-vbeln,
        END OF ty_vbrp.


DATA : lt_vbrp TYPE STANDARD TABLE OF ty_vbrp,
       ls_vbrp TYPE ty_vbrp.


FIELD-SYMBOLS : <fs_vbrp> TYPE ty_vbrp.


PARAMETERS p_count TYPE n LENGTH 6.


* Start of selection
START-OF-SELECTION.
* Get billing item data
  SELECT vbeln
      FROM vbap
      INTO TABLE lt_vbrp
      UP TO p_count ROWS.


END-OF-SELECTION.


* 1 . Loop with work area


  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp INTO ls_vbrp.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.
  v_diff_w = v_end_time - v_start_time.


  WRITE :/(30) 'Loop with Work area', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
* 2 . Loop with work area inline declaration
  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp INTO DATA(ls_vbrp_inline).
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.


  WRITE:/(30) 'Loop with Inline Work area', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
*   3 . Loop with Field symbol
  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp ASSIGNING <fs_vbrp>.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.


  WRITE:/(30) 'Loop with Field Symbol', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
* 4 . Loop with Field symbol inline declaration


  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp ASSIGNING FIELD-SYMBOL(<fs_vbrp_inline>).
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.

  WRITE:/(30) 'Loop with Inline Field Symbol', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.

2. 比照 loop,并将数据批改如上面的代码:

REPORT zloop_performance_test.


DATA : v_start_time TYPE timestampl,
       v_end_time   TYPE timestampl,
       v_diff_w     TYPE p DECIMALS 5.


TYPES : BEGIN OF ty_vbrp,
          vbeln TYPE vbrp-vbeln,
        END OF ty_vbrp.


DATA : lt_vbrp TYPE STANDARD TABLE OF ty_vbrp,
       ls_vbrp TYPE ty_vbrp.


FIELD-SYMBOLS : <fs_vbrp> TYPE ty_vbrp.


PARAMETERS p_count TYPE n LENGTH 6.


* Start of selection


START-OF-SELECTION.


* Get billing item data
  SELECT  vbeln
      FROM vbrp
      INTO TABLE lt_vbrp
      UP TO p_count ROWS.


END-OF-SELECTION.


* 1 . Loop with work area


  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp INTO ls_vbrp.
    ls_vbrp-vbeln = 1.
    MODIFY  lt_vbrp FROM ls_vbrp.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.
  v_diff_w = v_end_time - v_start_time.


  WRITE :/(30) 'Loop with Work area', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
* 2 . Loop with work area inline declaration
  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp INTO DATA(ls_vbrp_inline).
    ls_vbrp_inline-vbeln = 1.
    MODIFY  lt_vbrp FROM ls_vbrp_inline.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.


  WRITE:/(30) 'Loop with Inline Work area', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
*   3 . Loop with Field symbol
  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp ASSIGNING <fs_vbrp>.
    <fs_vbrp>-vbeln = 1.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.


  WRITE:/(30) 'Loop with Field Symbol', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.
* 4 . Loop with Field symbol inline declaration


  GET TIME STAMP FIELD v_start_time.


  LOOP AT lt_vbrp ASSIGNING FIELD-SYMBOL(<fs_vbrp_inline>).
    <fs_vbrp_inline>-vbeln = 1.
  ENDLOOP.


  GET TIME STAMP FIELD v_end_time.


  v_diff_w = v_end_time - v_start_time.


  WRITE:/(30) 'Loop with Inline Field Symbol', v_diff_w.
  CLEAR : v_start_time, v_end_time, v_end_time.

论断:

在两个测试后果中能够看出,loop 到工作区实际上有一个内表到工作区的赋值过程。从工作区 modify 到内表也有一个赋值的过程。而在 Field Symbol 中则是间接批改了内表值。所以速度会比拟快很多。

所以在能用 Field Symbol 的中央尽量应用 Field Symbol。

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