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替代双loop算法

2011-06-25 11:32:46| 分类：算法 | 标签： |举报 |字号大中小订阅

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data: l_tabix type sy-tabix.

*---一个交货对应多个开票,替换双loop算法:
* loop 思想: 从内表中找出所有符合where条件的数据(如果有where条件的话),再处理一内表条目
loop at gt_output into gw_output.
  clear l_tabix.
  do.
    if l_tabix = 0."准备读取第一条符合的数据
      read table gt_vbrp into gw_vbrp with key vgbel = gw_output-vbeln_vl binary search.
      if sy-subrc = 0.
        l_tabix = sy-tabix + 1.
        gw_output-vbeln_vf = gw_vbrp-vbeln.
        gw_output-fkart    = gw_vbrp-fkart.
        gw_output-erdat    = gw_vbrp-erdat.
        gw_output-fkdat    = gw_vbrp-fkdat.
        gw_output-spart    = gw_vbrp-spart.
        append gw_output to lt_output_temp.
        continue.
      else."没有读到任何符合的数据
        append gw_output to lt_output_temp.
        exit."退出do,进入下一个loop
      endif.
    else."准备读取下一条数据
      read table gt_vbrp into gw_vbrp index l_tabix.
      if sy-subrc = 0 and gw_vbrp-vgbel = gw_output-vbeln_vl.
        l_tabix = sy-tabix + 1.
        gw_output-vbeln_vf = gw_vbrp-vbeln.
        gw_output-fkart    = gw_vbrp-fkart.
        gw_output-erdat    = gw_vbrp-erdat.
        gw_output-fkdat    = gw_vbrp-fkdat.
        gw_output-spart    = gw_vbrp-spart.
        append gw_output to lt_output_temp.
        continue.
      else."读到的下一条数据不符合
        exit."退出do,进入下一个loop
      endif.
    endif.
  enddo.

endloop.

gt_output = lt_output_temp.                           "恢复gt_output

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