ABAP Select data from SAP table TWPFI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TWPFI table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to TWPFI. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the TWPFI table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_TWPFI TYPE STANDARD TABLE OF TWPFI,
      WA_TWPFI TYPE TWPFI,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <TWPFI> TYPE TWPFI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TWPFI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TWPFI
  INTO TABLE IT_TWPFI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWPFI
*  INTO TABLE @DATA(IT_TWPFI2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_TWPFI INDEX 1 INTO DATA(WA_TWPFI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TWPFI ASSIGNING <TWPFI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWPFI>-MANDT = 1.
<TWPFI>-KOPRO = 1.
<TWPFI>-POTYP = 1.
<TWPFI>-UMTYP = 1.
<TWPFI>-VZEIT = 1.

ENDLOOP.

LOOP AT IT_TWPFI INTO WA_TWPFI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWPFI-KURST, sy-vline,
  WA_TWPFI-AKFIN, sy-vline,
  WA_TWPFI-ERMOD, sy-vline,
  WA_TWPFI-POSDEX, sy-vline,
  WA_TWPFI-SALLMG, sy-vline,
  WA_TWPFI-EKOAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWPFI you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_TWPFI TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_TWPFI INTO WA_TWPFI.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TWPFI_STR, 
MANDT TYPE STRING,
KOPRO TYPE STRING,
POTYP TYPE STRING,
UMTYP TYPE STRING,
VZEIT TYPE STRING,
KURST TYPE STRING,
AKFIN TYPE STRING,
ERMOD TYPE STRING,
POSDEX TYPE STRING,
SALLMG TYPE STRING,
EKOAR TYPE STRING,
MEPER TYPE STRING,
RECDT TYPE STRING,
OKSTA TYPE STRING,
NPMAT TYPE STRING,
NPFOA TYPE STRING,
NPSET TYPE STRING,
NPMEC TYPE STRING,
NPCUR TYPE STRING,
NPTAX TYPE STRING,
NPCUS TYPE STRING,
EAN_ART TYPE STRING,
EAN_DEL TYPE STRING,
FOA_ART TYPE STRING,
MCAT_ART TYPE STRING,
NO_FABKL TYPE STRING,
MESTYPE_PLU TYPE STRING,
NO_BONTEXT TYPE STRING,
PROMO_REBATE TYPE STRING,
PRICES_SITEINDEP TYPE STRING,
PRICING_DIRECT TYPE STRING,
PRICING_DIRECT_MULT_ACCESS TYPE STRING,
PRICES_IN_A071 TYPE STRING,
NO_WARNINGS TYPE STRING,
TAXES_COPY TYPE STRING,
NO_TRIGGER TYPE STRING,
NOT_CHECK_SALES_PER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWPFI_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_TWPFI_STR-MANDT sy-vline 
WA_TWPFI_STR-KOPRO sy-vline 
WA_TWPFI_STR-POTYP sy-vline 
WA_TWPFI_STR-UMTYP sy-vline 
WA_TWPFI_STR-VZEIT sy-vline 
WA_TWPFI_STR-KURST sy-vline 
WA_TWPFI_STR-AKFIN sy-vline 
WA_TWPFI_STR-ERMOD sy-vline 
WA_TWPFI_STR-POSDEX sy-vline 
WA_TWPFI_STR-SALLMG sy-vline 
WA_TWPFI_STR-EKOAR sy-vline 
WA_TWPFI_STR-MEPER sy-vline 
WA_TWPFI_STR-RECDT sy-vline 
WA_TWPFI_STR-OKSTA sy-vline 
WA_TWPFI_STR-NPMAT sy-vline 
WA_TWPFI_STR-NPFOA sy-vline 
WA_TWPFI_STR-NPSET sy-vline 
WA_TWPFI_STR-NPMEC sy-vline 
WA_TWPFI_STR-NPCUR sy-vline 
WA_TWPFI_STR-NPTAX sy-vline 
WA_TWPFI_STR-NPCUS sy-vline 
WA_TWPFI_STR-EAN_ART sy-vline 
WA_TWPFI_STR-EAN_DEL sy-vline 
WA_TWPFI_STR-FOA_ART sy-vline 
WA_TWPFI_STR-MCAT_ART sy-vline 
WA_TWPFI_STR-NO_FABKL sy-vline 
WA_TWPFI_STR-MESTYPE_PLU sy-vline 
WA_TWPFI_STR-NO_BONTEXT sy-vline 
WA_TWPFI_STR-PROMO_REBATE sy-vline 
WA_TWPFI_STR-PRICES_SITEINDEP sy-vline 
WA_TWPFI_STR-PRICING_DIRECT sy-vline 
WA_TWPFI_STR-PRICING_DIRECT_MULT_ACCESS sy-vline 
WA_TWPFI_STR-PRICES_IN_A071 sy-vline 
WA_TWPFI_STR-NO_WARNINGS sy-vline 
WA_TWPFI_STR-TAXES_COPY sy-vline 
WA_TWPFI_STR-NO_TRIGGER sy-vline 
WA_TWPFI_STR-NOT_CHECK_SALES_PER sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.