ABAP Select data from SAP table VN2OK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN2OK 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 VN2OK. 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 VN2OK 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_VN2OK TYPE STANDARD TABLE OF VN2OK,
      WA_VN2OK TYPE VN2OK,
      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: <VN2OK> TYPE VN2OK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN2OK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN2OK
  INTO TABLE IT_VN2OK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN2OK
*  INTO TABLE @DATA(IT_VN2OK2).
*--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_VN2OK INDEX 1 INTO DATA(WA_VN2OK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN2OK ASSIGNING <VN2OK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN2OK>-MANDT = 1.
<VN2OK>-EINRI = 1.
<VN2OK>-ANKERLEIST = 1.
<VN2OK>-AVB_LFDNR = 1.
<VN2OK>-ISHM_AVBD = 1.

ENDLOOP.

LOOP AT IT_VN2OK INTO WA_VN2OK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN2OK-ISHM_AVBU, sy-vline,
  WA_VN2OK-ISHM_AVBZP, sy-vline,
  WA_VN2OK-ISHM_AVBAR, sy-vline,
  WA_VN2OK-ISHM_AVBNA, sy-vline,
  WA_VN2OK-ISHM_IAVBS, sy-vline,
  WA_VN2OK-ERUSR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN2OK 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_VN2OK 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_VN2OK INTO WA_VN2OK.


*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_VN2OK-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2OK-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANKERLEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN2OK-ANKERLEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2OK-ANKERLEIST.
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_VN2OK_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
ANKERLEIST TYPE STRING,
AVB_LFDNR TYPE STRING,
ISHM_AVBD TYPE STRING,
ISHM_AVBU TYPE STRING,
ISHM_AVBZP TYPE STRING,
ISHM_AVBAR TYPE STRING,
ISHM_AVBNA TYPE STRING,
ISHM_IAVBS TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
UPUSR TYPE STRING,
UPDAT TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
TIMESTAMP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN2OK_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_VN2OK_STR-MANDT sy-vline 
WA_VN2OK_STR-EINRI sy-vline 
WA_VN2OK_STR-ANKERLEIST sy-vline 
WA_VN2OK_STR-AVB_LFDNR sy-vline 
WA_VN2OK_STR-ISHM_AVBD sy-vline 
WA_VN2OK_STR-ISHM_AVBU sy-vline 
WA_VN2OK_STR-ISHM_AVBZP sy-vline 
WA_VN2OK_STR-ISHM_AVBAR sy-vline 
WA_VN2OK_STR-ISHM_AVBNA sy-vline 
WA_VN2OK_STR-ISHM_IAVBS sy-vline 
WA_VN2OK_STR-ERUSR sy-vline 
WA_VN2OK_STR-ERDAT sy-vline 
WA_VN2OK_STR-UPUSR sy-vline 
WA_VN2OK_STR-UPDAT sy-vline 
WA_VN2OK_STR-STORN sy-vline 
WA_VN2OK_STR-STUSR sy-vline 
WA_VN2OK_STR-STDAT sy-vline 
WA_VN2OK_STR-LOUSR sy-vline 
WA_VN2OK_STR-LODAT sy-vline 
WA_VN2OK_STR-TIMESTAMP sy-vline 
WA_VN2OK_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.