ABAP Select data from SAP table FKNVD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKNVD
*  INTO TABLE @DATA(IT_FKNVD2).
*--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_FKNVD INDEX 1 INTO DATA(WA_FKNVD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKNVD>-MANDT = 1.
<FKNVD>-KUNNR = 1.
<FKNVD>-VKORG = 1.
<FKNVD>-VTWEG = 1.
<FKNVD>-SPART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKNVD-DOCTP, sy-vline,
  WA_FKNVD-SPRAS, sy-vline,
  WA_FKNVD-DOANZ, sy-vline,
  WA_FKNVD-DOVER, sy-vline,
  WA_FKNVD-NACHA, sy-vline,
  WA_FKNVD-KZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKNVD 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_FKNVD 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_FKNVD INTO WA_FKNVD.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKNVD-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKNVD-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_FKNVD-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKNVD-SPRAS.
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_FKNVD_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
DOCTP TYPE STRING,
SPRAS TYPE STRING,
DOANZ TYPE STRING,
DOVER TYPE STRING,
NACHA TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKNVD_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_FKNVD_STR-MANDT sy-vline 
WA_FKNVD_STR-KUNNR sy-vline 
WA_FKNVD_STR-VKORG sy-vline 
WA_FKNVD_STR-VTWEG sy-vline 
WA_FKNVD_STR-SPART sy-vline 
WA_FKNVD_STR-DOCTP sy-vline 
WA_FKNVD_STR-SPRAS sy-vline 
WA_FKNVD_STR-DOANZ sy-vline 
WA_FKNVD_STR-DOVER sy-vline 
WA_FKNVD_STR-NACHA sy-vline 
WA_FKNVD_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.