ABAP Select data from SAP table /ATL/VSF_NKMK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ATL/VSF_NKMK 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 /ATL/VSF_NKMK. 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 /ATL/VSF_NKMK 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_/ATL/VSF_NKMK TYPE STANDARD TABLE OF /ATL/VSF_NKMK,
      WA_/ATL/VSF_NKMK TYPE /ATL/VSF_NKMK,
      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: </ATL/VSF_NKMK> TYPE /ATL/VSF_NKMK.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ATL/VSF_NKMK
  INTO TABLE IT_/ATL/VSF_NKMK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ATL/VSF_NKMK
*  INTO TABLE @DATA(IT_/ATL/VSF_NKMK2).
*--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_/ATL/VSF_NKMK INDEX 1 INTO DATA(WA_/ATL/VSF_NKMK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ATL/VSF_NKMK ASSIGNING </ATL/VSF_NKMK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ATL/VSF_NKMK>-LIFNR = 1.
</ATL/VSF_NKMK>-CUST_VEND = 1.
</ATL/VSF_NKMK>-NAME1 = 1.
</ATL/VSF_NKMK>-STRAS = 1.
</ATL/VSF_NKMK>-ORT01 = 1.

ENDLOOP.

LOOP AT IT_/ATL/VSF_NKMK INTO WA_/ATL/VSF_NKMK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ATL/VSF_NKMK-STCEG, sy-vline,
  WA_/ATL/VSF_NKMK-FISKN, sy-vline,
  WA_/ATL/VSF_NKMK-ERDAT, sy-vline,
  WA_/ATL/VSF_NKMK-ANRED, sy-vline,
  WA_/ATL/VSF_NKMK-PFACH, sy-vline,
  WA_/ATL/VSF_NKMK-PFORT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ATL/VSF_NKMK 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_/ATL/VSF_NKMK 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_/ATL/VSF_NKMK INTO WA_/ATL/VSF_NKMK.


*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 LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ATL/VSF_NKMK-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ATL/VSF_NKMK-LIFNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_/ATL/VSF_NKMK-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ATL/VSF_NKMK-GJAHR.
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_/ATL/VSF_NKMK_STR, 
LIFNR TYPE STRING,
CUST_VEND TYPE STRING,
NAME1 TYPE STRING,
STRAS TYPE STRING,
ORT01 TYPE STRING,
STCEG TYPE STRING,
FISKN TYPE STRING,
ERDAT TYPE STRING,
ANRED TYPE STRING,
PFACH TYPE STRING,
PFORT TYPE STRING,
PSTL2 TYPE STRING,
PSTLZ TYPE STRING,
GJAHR TYPE STRING,
DMBTR TYPE STRING,
MWSTS TYPE STRING,
QBSHB TYPE STRING,
BALANCE TYPE STRING,
SADR_NAME1 TYPE STRING,
INSURANCE TYPE STRING,
LAND1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ATL/VSF_NKMK_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_/ATL/VSF_NKMK_STR-LIFNR sy-vline 
WA_/ATL/VSF_NKMK_STR-CUST_VEND sy-vline 
WA_/ATL/VSF_NKMK_STR-NAME1 sy-vline 
WA_/ATL/VSF_NKMK_STR-STRAS sy-vline 
WA_/ATL/VSF_NKMK_STR-ORT01 sy-vline 
WA_/ATL/VSF_NKMK_STR-STCEG sy-vline 
WA_/ATL/VSF_NKMK_STR-FISKN sy-vline 
WA_/ATL/VSF_NKMK_STR-ERDAT sy-vline 
WA_/ATL/VSF_NKMK_STR-ANRED sy-vline 
WA_/ATL/VSF_NKMK_STR-PFACH sy-vline 
WA_/ATL/VSF_NKMK_STR-PFORT sy-vline 
WA_/ATL/VSF_NKMK_STR-PSTL2 sy-vline 
WA_/ATL/VSF_NKMK_STR-PSTLZ sy-vline 
WA_/ATL/VSF_NKMK_STR-GJAHR sy-vline 
WA_/ATL/VSF_NKMK_STR-DMBTR sy-vline 
WA_/ATL/VSF_NKMK_STR-MWSTS sy-vline 
WA_/ATL/VSF_NKMK_STR-QBSHB sy-vline 
WA_/ATL/VSF_NKMK_STR-BALANCE sy-vline 
WA_/ATL/VSF_NKMK_STR-SADR_NAME1 sy-vline 
WA_/ATL/VSF_NKMK_STR-INSURANCE sy-vline 
WA_/ATL/VSF_NKMK_STR-LAND1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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