How to create a txt-file on the application server filled with an internal table? - abap

Question

I'm learning ABAP at the moment and got the task to build a function that creates a .txt file or a .csv file from an internal table and save it on the application server.
I know you can use, for example, GUI_DOWNLOAD for that, but the task is to build my own function to do that.
So I got an internal table filled and I want that to be saved as .txt file on the AS. I'm coding in Eclipse, BTW.
Anybody has an idea how to do that, using a function?
EDIT:
Here's what I tried already:
I created a function in the function builder. On the import parameters I put a parameter with the name "lv_mytab" with type table.
The source code of my function looks like this:
*"-------------------------------------------------------------------
*"*"Lokale Schnittstelle:
*" IMPORTING
*" REFERENCE(LV_MYTAB) TYPE TABLE
*"-------------------------------------------------------------------
DATA(myfile) = '/usr/sap/S42/data/textfile.txt'.
OPEN DATASET myfile FOR OUTPUT IN TEXT MODE ENCODING DEFAULT WITH SMART LINEFEED.
LOOP AT lv_mytab into lt_table.
TRANSFER lt_table to myfile.
CLOSE DATASET myfile.
In my program I tried calling the function like this:
CALL FUNCTION 'EXPORT_TXT_CSV_MR'
EXPORTING
lv_mytab = lt_summe.
lt_summe is the internal table I want to be exported as txt or csv.

Answer 1

Something like this:
OPEN DATASET lv_p_app FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
LOOP AT gt_error INTO gs_final.
TRANSFER gs_final TO lv_p_app.
ENDLOOP.
CLOSE DATASET lv_p_app.
ENDIF.
More samples here https://answers.sap.com/questions/3704234/download-internal-table-onto-the-application-serve.html

Answer 2

Okay with the help of a fellow student I got it working.
Heres the solution I found:
Code source of the function:
FUNCTION EXPORT_TXT_CSV_MR.
*"----------------------------------------------------------------------
*"*"Lokale Schnittstelle:
*" IMPORTING
*" REFERENCE(S_FILENAME) TYPE STRING
*" CHANGING
*" REFERENCE(GT_MYTAB) TYPE STANDARD TABLE
*" REFERENCE(GD_VERARBEITUNG) TYPE INT4
*"----------------------------------------------------------------------
DATA:
ld_filename TYPE string,
ld_datei type standard table of sbook,
ld_Zeile like line of ld_datei,
gd_useraction TYPE i,
lt_Ausgabe TYPE STANDARD TABLE OF sbook.
CONCATENATE '/usr/sap/S42/data/' s_filename into ld_filename.
IF gd_Verarbeitung = 1.
ld_datei = gt_mytab.
OPEN DATASET ld_filename FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
LOOP AT ld_datei into ld_Zeile.
Data(ld_string) = | Partnernummer: { ld_Zeile-customid } Betrag: { ld_Zeile-forcuram } Waehrung: { ld_Zeile-forcurkey } Name: { ld_Zeile-passname }|.
Transfer ld_string to ld_filename.
ENDLOOP.
Close dataset ld_filename.
ElseIF gd_Verarbeitung = 2.
ld_datei = gt_mytab.
*ld_filename = '/usr/sap/S42/data/CSVFile_MR.csv'.
Open Dataset ld_filename for output in text mode encoding default with SMART LINEFEED.
LOOP AT ld_datei into ld_Zeile.
ld_string = | Partnernummer: { ld_Zeile-customid } Betrag: { ld_Zeile-forcuram } Waehrung: { ld_Zeile-forcurkey } Name: { ld_Zeile-passname }|.
Transfer ld_string to ld_filename.
ENDLOOP.
Close dataset ld_filename.
ENDIF.
ENDFUNCTION.
And in my program I call it like this:
if p_txt = 'X'.
ld_txtcsv = 1.
CALL FUNCTION 'EXPORT_TXT_CSV_MR'
EXPORTING
s_filename = 'TXTFile_MR.txt'
CHANGING
gt_mytab = lt_summe
gd_verarbeitung = ld_txtcsv.
clear ld_txtcsv.
endif.
if p_csv = 'X'.
ld_txtcsv = 2.
CALL FUNCTION 'EXPORT_TXT_CSV_MR'
EXPORTING
s_filename = 'CSVFile_MR.csv'
CHANGING
gt_mytab = lt_summe
gd_verarbeitung = ld_txtcsv.
clear ld_txtcsv.
ENDIF.
Thanks for all of your help! I got it now! :)