ABAP Select data from SAP table VN2DO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN2DO 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 VN2DO. 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 VN2DO 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_VN2DO TYPE STANDARD TABLE OF VN2DO,
      WA_VN2DO TYPE VN2DO,
      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: <VN2DO> TYPE VN2DO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN2DO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN2DO
  INTO TABLE IT_VN2DO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN2DO
*  INTO TABLE @DATA(IT_VN2DO2).
*--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_VN2DO INDEX 1 INTO DATA(WA_VN2DO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN2DO ASSIGNING <VN2DO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN2DO>-MANDT = 1.
<VN2DO>-EINRI = 1.
<VN2DO>-ORGID = 1.
<VN2DO>-DTID = 1.
<VN2DO>-DTVERS = 1.

ENDLOOP.

LOOP AT IT_VN2DO INTO WA_VN2DO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN2DO-DOZUO, sy-vline,
  WA_VN2DO-BEGDT, sy-vline,
  WA_VN2DO-ENDDT, sy-vline,
  WA_VN2DO-ZUOOPTION, sy-vline,
  WA_VN2DO-ZUOOPTION2, sy-vline,
  WA_VN2DO-ZUOOPTION3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN2DO 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_VN2DO 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_VN2DO INTO WA_VN2DO.


*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.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN2DO-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2DO-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN2DO-ORGID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2DO-ORGID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOKOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN2DO-DOKOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2DO-DOKOE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_VN2DO_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
ORGID TYPE STRING,
DTID TYPE STRING,
DTVERS TYPE STRING,
DOZUO TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
ZUOOPTION TYPE STRING,
ZUOOPTION2 TYPE STRING,
ZUOOPTION3 TYPE STRING,
DTINTERN TYPE STRING,
DOPFLI TYPE STRING,
DOKOE TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
UPUSR TYPE STRING,
UPDAT TYPE STRING,
PRIO TYPE STRING,
POPUP TYPE STRING,
OPBUCH TYPE STRING,
BEW_ERF TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN2DO_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_VN2DO_STR-MANDT sy-vline 
WA_VN2DO_STR-EINRI sy-vline 
WA_VN2DO_STR-ORGID sy-vline 
WA_VN2DO_STR-DTID sy-vline 
WA_VN2DO_STR-DTVERS sy-vline 
WA_VN2DO_STR-DOZUO sy-vline 
WA_VN2DO_STR-BEGDT sy-vline 
WA_VN2DO_STR-ENDDT sy-vline 
WA_VN2DO_STR-ZUOOPTION sy-vline 
WA_VN2DO_STR-ZUOOPTION2 sy-vline 
WA_VN2DO_STR-ZUOOPTION3 sy-vline 
WA_VN2DO_STR-DTINTERN sy-vline 
WA_VN2DO_STR-DOPFLI sy-vline 
WA_VN2DO_STR-DOKOE sy-vline 
WA_VN2DO_STR-ERUSR sy-vline 
WA_VN2DO_STR-ERDAT sy-vline 
WA_VN2DO_STR-UPUSR sy-vline 
WA_VN2DO_STR-UPDAT sy-vline 
WA_VN2DO_STR-PRIO sy-vline 
WA_VN2DO_STR-POPUP sy-vline 
WA_VN2DO_STR-OPBUCH sy-vline 
WA_VN2DO_STR-BEW_ERF sy-vline 
WA_VN2DO_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.