ABAP Select data from SAP table V_NNK1_N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_NNK1_N 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 V_NNK1_N. 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 V_NNK1_N 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_V_NNK1_N TYPE STANDARD TABLE OF V_NNK1_N,
      WA_V_NNK1_N TYPE V_NNK1_N,
      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: <V_NNK1_N> TYPE V_NNK1_N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_NNK1_N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_NNK1_N
  INTO TABLE IT_V_NNK1_N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_NNK1_N
*  INTO TABLE @DATA(IT_V_NNK1_N2).
*--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_V_NNK1_N INDEX 1 INTO DATA(WA_V_NNK1_N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_NNK1_N ASSIGNING <V_NNK1_N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_NNK1_N>-MANDT = 1.
<V_NNK1_N>-KOSTR = 1.
<V_NNK1_N>-EINRI = 1.
<V_NNK1_N>-FALAR = 1.
<V_NNK1_N>-TARIF = 1.

ENDLOOP.

LOOP AT IT_V_NNK1_N INTO WA_V_NNK1_N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_NNK1_N-TARLS, sy-vline,
  WA_V_NNK1_N-BILLP, sy-vline,
  WA_V_NNK1_N-PERNR, sy-vline,
  WA_V_NNK1_N-DEBTP, sy-vline,
  WA_V_NNK1_N-AUTTP, sy-vline,
  WA_V_NNK1_N-SAMRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_NNK1_N 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_V_NNK1_N 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_V_NNK1_N INTO WA_V_NNK1_N.


*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 KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_NNK1_N-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NNK1_N-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_NNK1_N-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NNK1_N-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_NNK1_N-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NNK1_N-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_NNK1_N-TARLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NNK1_N-TARLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PERNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_NNK1_N-PERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_NNK1_N-PERNR.
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_V_NNK1_N_STR, 
MANDT TYPE STRING,
KOSTR TYPE STRING,
EINRI TYPE STRING,
FALAR TYPE STRING,
TARIF TYPE STRING,
TARLS TYPE STRING,
BILLP TYPE STRING,
PERNR TYPE STRING,
DEBTP TYPE STRING,
AUTTP TYPE STRING,
SAMRE TYPE STRING,
VEKTI TYPE STRING,
EINKB TYPE STRING,
KATKB TYPE STRING,
KTXT1 TYPE STRING,
KTRNM TYPE STRING,
BSNKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_NNK1_N_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_V_NNK1_N_STR-MANDT sy-vline 
WA_V_NNK1_N_STR-KOSTR sy-vline 
WA_V_NNK1_N_STR-EINRI sy-vline 
WA_V_NNK1_N_STR-FALAR sy-vline 
WA_V_NNK1_N_STR-TARIF sy-vline 
WA_V_NNK1_N_STR-TARLS sy-vline 
WA_V_NNK1_N_STR-BILLP sy-vline 
WA_V_NNK1_N_STR-PERNR sy-vline 
WA_V_NNK1_N_STR-DEBTP sy-vline 
WA_V_NNK1_N_STR-AUTTP sy-vline 
WA_V_NNK1_N_STR-SAMRE sy-vline 
WA_V_NNK1_N_STR-VEKTI sy-vline 
WA_V_NNK1_N_STR-EINKB sy-vline 
WA_V_NNK1_N_STR-KATKB sy-vline 
WA_V_NNK1_N_STR-KTXT1 sy-vline 
WA_V_NNK1_N_STR-KTRNM sy-vline 
WA_V_NNK1_N_STR-BSNKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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