ABAP Select data from SAP table V_TWLFEX into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWLFEX 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 V_TWLFEX. 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 V_TWLFEX 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_V_TWLFEX TYPE STANDARD TABLE OF V_TWLFEX,
      WA_V_TWLFEX TYPE V_TWLFEX,
      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: <V_TWLFEX> TYPE V_TWLFEX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWLFEX
*  INTO TABLE @DATA(IT_V_TWLFEX2).
*--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_V_TWLFEX INDEX 1 INTO DATA(WA_V_TWLFEX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWLFEX>-MANDT = 1.
<V_TWLFEX>-LAND1 = 1.
<V_TWLFEX>-LFART = 1.
<V_TWLFEX>-LFGRU = 1.
<V_TWLFEX>-ITEMCAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWLFEX-RETURNS, sy-vline,
  WA_V_TWLFEX-EXART, sy-vline,
  WA_V_TWLFEX-BEZEI, sy-vline,
  WA_V_TWLFEX-TEXT2, sy-vline,
  WA_V_TWLFEX-TEXT3, sy-vline,
  WA_V_TWLFEX-TEXT4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWLFEX 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_V_TWLFEX 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_V_TWLFEX INTO WA_V_TWLFEX.


*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_V_TWLFEX_STR, 
MANDT TYPE STRING,
LAND1 TYPE STRING,
LFART TYPE STRING,
LFGRU TYPE STRING,
ITEMCAT TYPE STRING,
RETURNS TYPE STRING,
EXART TYPE STRING,
BEZEI TYPE STRING,
TEXT2 TYPE STRING,
TEXT3 TYPE STRING,
TEXT4 TYPE STRING,
TEXT5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWLFEX_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_V_TWLFEX_STR-MANDT sy-vline 
WA_V_TWLFEX_STR-LAND1 sy-vline 
WA_V_TWLFEX_STR-LFART sy-vline 
WA_V_TWLFEX_STR-LFGRU sy-vline 
WA_V_TWLFEX_STR-ITEMCAT sy-vline 
WA_V_TWLFEX_STR-RETURNS sy-vline 
WA_V_TWLFEX_STR-EXART sy-vline 
WA_V_TWLFEX_STR-BEZEI sy-vline 
WA_V_TWLFEX_STR-TEXT2 sy-vline 
WA_V_TWLFEX_STR-TEXT3 sy-vline 
WA_V_TWLFEX_STR-TEXT4 sy-vline 
WA_V_TWLFEX_STR-TEXT5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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