Timeout when using ALV build-in functionality: exporting to Excel

Question

Hello,
I have the following problem within one of my web dynpro abap applications:
I need to be able to display data in a table that preferably should be via alv component.
Then I shall also be able to download the displayed data via Excel.
So I have embedded the ALV component I added to the component within a view and activated the export to excel button.
Downloading small amount of data does no lead to any problem, but when trying to process a larger amount of data (in this case 22500 entries), I get a timeout.
Does anybody have any idea if it is possible to increase performance here without reducing the amount of data to be downloaded?
thanks a lot ion advance!
Ana

Answer 1

Hello,
coming back to the UI element download.
I managed to get the data being saved to the desktop, but unfortunately, the data remains being displayed as in chines letters.
Anybody got an idea, what parameters I might have set wrong? Or if I have to do an additional encoding before generating the XString?
Here is the supply method code and the parameters I have set in the UI element:
The Supply method
method GEN_EXCEL_DOWNLOAD_DATA .
  data: wa_cmx_line type zksb_cmxshowline.
  data: lt_excel type zksb_cmx_excel_download_t.
  data: wa_excel type zksb_cmx_excel_download.
  data: l_guid type guid_32.
  data: l_url type string.
* read context-------------------------------------------------------------------------------------
  data lo_nd_z_ksb_get_prcm type ref to if_wd_context_node.
  data lo_nd_exporting type ref to if_wd_context_node.
  data lo_nd_rt_zksb_cmx_show type ref to if_wd_context_node.
  data lo_el_rt_zksb_cmx_show type ref to if_wd_context_element.
  data lt_rt_zksb_cmx_show type table of wd_this->element_rt_zksb_cmx_show.
  data wa_rt_zksb_cmx_show like line of lt_rt_zksb_cmx_show.
*   navigate from <CONTEXT> to <Z_KSB_GET_PRCM> via lead selection
  lo_nd_z_ksb_get_prcm = wd_context->get_child_node( name = wd_this->wdctx_z_ksb_get_prcm ).
*   navigate from <Z_KSB_GET_PRCM> to <EXPORTING> via lead selection
  lo_nd_exporting = lo_nd_z_ksb_get_prcm->get_child_node( name = wd_this->wdctx_exporting ).
*   navigate from <EXPORTING> to <RT_ZKSB_CMX_SHOW> via lead selection
  lo_nd_rt_zksb_cmx_show = lo_nd_exporting->get_child_node( name = wd_this->wdctx_rt_zksb_cmx_show ).
*   @TODO handle not set lead selection
  if lo_nd_rt_zksb_cmx_show is initial.
  endif.
* get static attributes table
  lo_nd_rt_zksb_cmx_show->get_static_attributes_table( importing table = lt_rt_zksb_cmx_show ).
* reduce data to only the data that shall be displayed----------------------------------------
  loop at lt_rt_zksb_cmx_show into wa_rt_zksb_cmx_show.
    move-corresponding wa_rt_zksb_cmx_show to wa_excel.
    append wa_excel to lt_excel.
  endloop.
* populate data as tab separated strings-----------------------------------------------------
  data l_str  type string.
  data lv_struct type extdfiest.
  data itab type ref to zksb_cmx_excel_download_t.
  data r_xstring type xstring.
  data s(256) type c.
  field-symbols <wa_desc> like line of lv_struct.
  field-symbols: <tab> type table.
  field-symbols:  <wa> type any.
  field-symbols:  <f> type any.
* populate the column headers----------------------
  get reference of lt_excel into itab.
* assign lt_excel to <tab>.
  assign itab->* to <tab>.
  lv_struct = wd_this->get_table_structure( itab = itab ).
  loop at lv_struct assigning <wa_desc>.
    concatenate wa_cmx_line
                <wa_desc>-coltitle
                cl_abap_char_utilities=>horizontal_tab
                into wa_cmx_line.
  endloop.
  concatenate wa_cmx_line
              cl_abap_char_utilities=>cr_lf
              into wa_cmx_line.
* loop through the data table-----------------------
  loop at <tab> assigning <wa>.
    loop at lv_struct assigning <wa_desc>.
      assign component sy-tabix of structure <wa> to <f>.
      check sy-subrc = 0.
      if <wa_desc> is assigned and <wa_desc>-convexit is not initial.
*  Process any output conversion routines
        concatenate 'CONVERSION_EXIT_' <wa_desc>-convexit '_OUTPUT' into wa_cmx_line.
        call function wa_cmx_line
          exporting
            input  = <f>
          importing
            output = s.
      else.
        concatenate wa_cmx_line
                 <f>
                  cl_abap_char_utilities=>horizontal_tab
                  into wa_cmx_line.
      endif.
    endloop.
    concatenate wa_cmx_line
                cl_abap_char_utilities=>cr_lf
                into wa_cmx_line.
  endloop.
*Convert the strings to Binary strings (UTF-16le)------------------------------------------------
  call function 'SCMS_STRING_TO_XSTRING'
    exporting
      text     = wa_cmx_line
      mimetype = ''
    importing
      buffer   = r_xstring.
*Add the UTF-16 Little Endian Byte Order Mark to the begining of the file
  concatenate  cl_abap_char_utilities=>byte_order_mark_little
               r_xstring
               into r_xstring in byte mode.
* set context
  DATA lo_nd_excel_download TYPE REF TO if_wd_context_node.
  DATA lo_el_excel_download TYPE REF TO if_wd_context_element.
  DATA ls_excel_download TYPE wd_this->element_excel_download.
  DATA lv_excel_download_data LIKE ls_excel_download-excel_download_data.
* navigate from <CONTEXT> to <EXCEL_DOWNLOAD> via lead selection
  lo_nd_excel_download = wd_context->get_child_node( name = wd_this->wdctx_excel_download ).
* get element via lead selection
  lo_el_excel_download = lo_nd_excel_download->get_element(  ).
* set single attribute
  lo_el_excel_download->set_attribute( name =  `EXCEL_DOWNLOAD_DATA`  value = r_xstring ).
endmethod.
and the parameters to the UI are as follows
behaviour: allowSave
data: <data that was created by supply method>
fileName: CMX.xls          also tried CMX.cvs
mime-type: ms-excel     also tried  /vnd.ms-excel
text: $OTR:SOTR_VOCABULARY_BASIC/DOWNLOAD
textDirection: inherit
type: navigation
visible: Visible
Any suggestion of what I might have to change would be great!
Tx
Ana