ABAP Select data from SAP table VN2DE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN2DE 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 VN2DE. 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 VN2DE 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_VN2DE TYPE STANDARD TABLE OF VN2DE,
      WA_VN2DE TYPE VN2DE,
      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: <VN2DE> TYPE VN2DE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN2DE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN2DE
  INTO TABLE IT_VN2DE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN2DE
*  INTO TABLE @DATA(IT_VN2DE2).
*--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_VN2DE INDEX 1 INTO DATA(WA_VN2DE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN2DE ASSIGNING <VN2DE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN2DE>-MANDT = 1.
<VN2DE>-DEID = 1.
<VN2DE>-STRUC = 1.
<VN2DE>-GRAPH = 1.
<VN2DE>-HOEHE = 1.

ENDLOOP.

LOOP AT IT_VN2DE INTO WA_VN2DE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN2DE-BREITE, sy-vline,
  WA_VN2DE-DETYP, sy-vline,
  WA_VN2DE-DAID, sy-vline,
  WA_VN2DE-TABKZ, sy-vline,
  WA_VN2DE-RTXTLEN, sy-vline,
  WA_VN2DE-TXTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN2DE 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_VN2DE 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_VN2DE INTO WA_VN2DE.


*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_VN2DE_STR, 
MANDT TYPE STRING,
DEID TYPE STRING,
STRUC TYPE STRING,
GRAPH TYPE STRING,
HOEHE TYPE STRING,
BREITE TYPE STRING,
DETYP TYPE STRING,
DAID TYPE STRING,
TABKZ TYPE STRING,
RTXTLEN TYPE STRING,
TXTLEN TYPE STRING,
DOVOREX TYPE STRING,
STRUCTYP TYPE STRING,
VARLOOP TYPE STRING,
BUTWIDTH TYPE STRING,
NUMOCC TYPE STRING,
SUBPOOL TYPE STRING,
SUBDYNP TYPE STRING,
SUBFORM TYPE STRING,
FDBSID TYPE STRING,
ISREF TYPE STRING,
PARAMSTR TYPE STRING,
NQUERY TYPE STRING,
ISAEND TYPE STRING,
HELPF4 TYPE STRING,
FDB_GET_REQUEST TYPE STRING,
FDB_UPD_REQUEST TYPE STRING,
LABSID TYPE STRING,
LINKELETYP TYPE STRING,
OUTPUTLEN TYPE STRING,
WTABEXI TYPE STRING,
GETFROM TYPE STRING,
FUNCTION1 TYPE STRING,
WREQUEST TYPE STRING,
XPRANUM TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
UPUSR TYPE STRING,
UPDAT TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
STATUS TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN2DE_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_VN2DE_STR-MANDT sy-vline 
WA_VN2DE_STR-DEID sy-vline 
WA_VN2DE_STR-STRUC sy-vline 
WA_VN2DE_STR-GRAPH sy-vline 
WA_VN2DE_STR-HOEHE sy-vline 
WA_VN2DE_STR-BREITE sy-vline 
WA_VN2DE_STR-DETYP sy-vline 
WA_VN2DE_STR-DAID sy-vline 
WA_VN2DE_STR-TABKZ sy-vline 
WA_VN2DE_STR-RTXTLEN sy-vline 
WA_VN2DE_STR-TXTLEN sy-vline 
WA_VN2DE_STR-DOVOREX sy-vline 
WA_VN2DE_STR-STRUCTYP sy-vline 
WA_VN2DE_STR-VARLOOP sy-vline 
WA_VN2DE_STR-BUTWIDTH sy-vline 
WA_VN2DE_STR-NUMOCC sy-vline 
WA_VN2DE_STR-SUBPOOL sy-vline 
WA_VN2DE_STR-SUBDYNP sy-vline 
WA_VN2DE_STR-SUBFORM sy-vline 
WA_VN2DE_STR-FDBSID sy-vline 
WA_VN2DE_STR-ISREF sy-vline 
WA_VN2DE_STR-PARAMSTR sy-vline 
WA_VN2DE_STR-NQUERY sy-vline 
WA_VN2DE_STR-ISAEND sy-vline 
WA_VN2DE_STR-HELPF4 sy-vline 
WA_VN2DE_STR-FDB_GET_REQUEST sy-vline 
WA_VN2DE_STR-FDB_UPD_REQUEST sy-vline 
WA_VN2DE_STR-LABSID sy-vline 
WA_VN2DE_STR-LINKELETYP sy-vline 
WA_VN2DE_STR-OUTPUTLEN sy-vline 
WA_VN2DE_STR-WTABEXI sy-vline 
WA_VN2DE_STR-GETFROM sy-vline 
WA_VN2DE_STR-FUNCTION1 sy-vline 
WA_VN2DE_STR-WREQUEST sy-vline 
WA_VN2DE_STR-XPRANUM sy-vline 
WA_VN2DE_STR-ERUSR sy-vline 
WA_VN2DE_STR-ERDAT sy-vline 
WA_VN2DE_STR-UPUSR sy-vline 
WA_VN2DE_STR-UPDAT sy-vline 
WA_VN2DE_STR-LOEKZ sy-vline 
WA_VN2DE_STR-LOUSR sy-vline 
WA_VN2DE_STR-LODAT sy-vline 
WA_VN2DE_STR-STATUS sy-vline 
WA_VN2DE_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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