ALV的报表对用户定义格式的控制(ALV I_SAVE)

很多ALV的报表都需要手动的进行设置格式以使数据看上去更有意义和条理，如果每次进来都重新操作一遍是很烦人的，所以SAP有提供了一个保存格式的功能，保存格式可以是 ‘缺省设置’ 和 ‘特定用户’ 两种 至于这两种功能的激活是在程序中指定的。

I_SAVE 参数有四个可选值 分别是 空（两个功能都关闭，只能选择更改不能保存）  X（只保留缺省默认的） U(只保留特定用户功能) A(缺省默认和特定用户都可以)，

1.FUN ALV

在调用显示ALV函数的时候有个I_SAVE 参数

  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program = g_repid
      is_layout          = gs_layout
      it_fieldcat        = gt_fieldcat[]
      i_save             = 'A'
      is_variant         = v_stru_disvar
      it_events          = git_events[]
      it_sort            = it_sort[]
      is_print           = gs_print
    TABLES
      t_outtab           = gt_data
    EXCEPTIONS
      program_error      = 1
      OTHERS             = 2.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
  ENDIF.

2.OO ALV 的方式和FUN的有点不同
DATA:g_variant TYPE disvariant.
g_variant-report = sy-repid.
CALL METHOD gcl_alv->set_table_for_first_display
    EXPORTING
      is_layout                     = gs_layout
      is_variant                    = g_variant
      i_save                        = 'A'
      it_toolbar_excluding          = gt_exclude
    CHANGING
      it_outtab                     = gt_data[]
      it_fieldcatalog               = gt_fieldcat
    EXCEPTIONS
      invalid_parameter_combination = 1
      program_error                 = 2
      too_many_lines                = 3
      OTHERS                        = 4.

下面是SAP对 I_SAVE 这个参数的官方介绍。
' ' = Display variants cannot be saved
Defined display variants (such as delivered display variants) can be selected for presentation regardless of this indicator. However, changes cannot be saved.
'X' = Standard save mode
Display variants can be saved as standard display variants.
Saving display variants as user-specific is not possible.
'U' = User-specific save mode
Display variants can only be saved as user-specific.
'A' = Standard and user-specific save mode
Display variants can be saved both as user-specific and as standard
variants. Users make their choice on the dialog box for saving the
display variant.