ABAP Select data from SAP table V_KNA1WRF1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_KNA1WRF1 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_KNA1WRF1. 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_KNA1WRF1 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_KNA1WRF1 TYPE STANDARD TABLE OF V_KNA1WRF1,
      WA_V_KNA1WRF1 TYPE V_KNA1WRF1,
      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_KNA1WRF1> TYPE V_KNA1WRF1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_KNA1WRF1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_KNA1WRF1
  INTO TABLE IT_V_KNA1WRF1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_KNA1WRF1
*  INTO TABLE @DATA(IT_V_KNA1WRF12).
*--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_KNA1WRF1 INDEX 1 INTO DATA(WA_V_KNA1WRF12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_KNA1WRF1 ASSIGNING <V_KNA1WRF1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_KNA1WRF1>-MANDT = 1.
<V_KNA1WRF1>-KUNNR = 1.
<V_KNA1WRF1>-NAME1 = 1.
<V_KNA1WRF1>-WERKS = 1.
<V_KNA1WRF1>-KATR1 = 1.

ENDLOOP.

LOOP AT IT_V_KNA1WRF1 INTO WA_V_KNA1WRF1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_KNA1WRF1-KATR2, sy-vline,
  WA_V_KNA1WRF1-KATR3, sy-vline,
  WA_V_KNA1WRF1-KATR4, sy-vline,
  WA_V_KNA1WRF1-KATR5, sy-vline,
  WA_V_KNA1WRF1-KATR6, sy-vline,
  WA_V_KNA1WRF1-KATR7, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_KNA1WRF1 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_KNA1WRF1 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_KNA1WRF1 INTO WA_V_KNA1WRF1.


*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_V_KNA1WRF1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNA1WRF1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_KNA1WRF1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNA1WRF1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_V_KNA1WRF1-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNA1WRF1-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VERFE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_KNA1WRF1-VERFE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNA1WRF1-VERFE.
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_KNA1WRF1_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
NAME1 TYPE STRING,
WERKS TYPE STRING,
KATR1 TYPE STRING,
KATR2 TYPE STRING,
KATR3 TYPE STRING,
KATR4 TYPE STRING,
KATR5 TYPE STRING,
KATR6 TYPE STRING,
KATR7 TYPE STRING,
KATR8 TYPE STRING,
KATR9 TYPE STRING,
KATR10 TYPE STRING,
LIFNR TYPE STRING,
KNAZK TYPE STRING,
BEGRU TYPE STRING,
BRSCH TYPE STRING,
EXABL TYPE STRING,
KUKLA TYPE STRING,
LAND1 TYPE STRING,
LIFSD TYPE STRING,
LOEVM TYPE STRING,
NIELS TYPE STRING,
SPRAS TYPE STRING,
STKZA TYPE STRING,
STKZU TYPE STRING,
LZONE TYPE STRING,
XCPDK TYPE STRING,
TXJCD TYPE STRING,
HZUOR TYPE STRING,
SPERZ TYPE STRING,
ETIKG TYPE STRING,
EROED TYPE STRING,
SCHLD TYPE STRING,
SPDAB TYPE STRING,
SPDBI TYPE STRING,
KOPRO TYPE STRING,
AUTOB TYPE STRING,
LAYVR TYPE STRING,
FLVAR TYPE STRING,
STFAK TYPE STRING,
VERFL TYPE STRING,
VERFE TYPE STRING,
SPGR1 TYPE STRING,
INPRO TYPE STRING,
EKOAR TYPE STRING,
KZLIK TYPE STRING,
BETRP TYPE STRING,
NLMATFB TYPE STRING,
BWWRK TYPE STRING,
BWVKO TYPE STRING,
BWVTW TYPE STRING,
BBPRO TYPE STRING,
VKBUR_WRK TYPE STRING,
VLFKZ TYPE STRING,
LSTFL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_KNA1WRF1_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_KNA1WRF1_STR-MANDT sy-vline 
WA_V_KNA1WRF1_STR-KUNNR sy-vline 
WA_V_KNA1WRF1_STR-NAME1 sy-vline 
WA_V_KNA1WRF1_STR-WERKS sy-vline 
WA_V_KNA1WRF1_STR-KATR1 sy-vline 
WA_V_KNA1WRF1_STR-KATR2 sy-vline 
WA_V_KNA1WRF1_STR-KATR3 sy-vline 
WA_V_KNA1WRF1_STR-KATR4 sy-vline 
WA_V_KNA1WRF1_STR-KATR5 sy-vline 
WA_V_KNA1WRF1_STR-KATR6 sy-vline 
WA_V_KNA1WRF1_STR-KATR7 sy-vline 
WA_V_KNA1WRF1_STR-KATR8 sy-vline 
WA_V_KNA1WRF1_STR-KATR9 sy-vline 
WA_V_KNA1WRF1_STR-KATR10 sy-vline 
WA_V_KNA1WRF1_STR-LIFNR sy-vline 
WA_V_KNA1WRF1_STR-KNAZK sy-vline 
WA_V_KNA1WRF1_STR-BEGRU sy-vline 
WA_V_KNA1WRF1_STR-BRSCH sy-vline 
WA_V_KNA1WRF1_STR-EXABL sy-vline 
WA_V_KNA1WRF1_STR-KUKLA sy-vline 
WA_V_KNA1WRF1_STR-LAND1 sy-vline 
WA_V_KNA1WRF1_STR-LIFSD sy-vline 
WA_V_KNA1WRF1_STR-LOEVM sy-vline 
WA_V_KNA1WRF1_STR-NIELS sy-vline 
WA_V_KNA1WRF1_STR-SPRAS sy-vline 
WA_V_KNA1WRF1_STR-STKZA sy-vline 
WA_V_KNA1WRF1_STR-STKZU sy-vline 
WA_V_KNA1WRF1_STR-LZONE sy-vline 
WA_V_KNA1WRF1_STR-XCPDK sy-vline 
WA_V_KNA1WRF1_STR-TXJCD sy-vline 
WA_V_KNA1WRF1_STR-HZUOR sy-vline 
WA_V_KNA1WRF1_STR-SPERZ sy-vline 
WA_V_KNA1WRF1_STR-ETIKG sy-vline 
WA_V_KNA1WRF1_STR-EROED sy-vline 
WA_V_KNA1WRF1_STR-SCHLD sy-vline 
WA_V_KNA1WRF1_STR-SPDAB sy-vline 
WA_V_KNA1WRF1_STR-SPDBI sy-vline 
WA_V_KNA1WRF1_STR-KOPRO sy-vline 
WA_V_KNA1WRF1_STR-AUTOB sy-vline 
WA_V_KNA1WRF1_STR-LAYVR sy-vline 
WA_V_KNA1WRF1_STR-FLVAR sy-vline 
WA_V_KNA1WRF1_STR-STFAK sy-vline 
WA_V_KNA1WRF1_STR-VERFL sy-vline 
WA_V_KNA1WRF1_STR-VERFE sy-vline 
WA_V_KNA1WRF1_STR-SPGR1 sy-vline 
WA_V_KNA1WRF1_STR-INPRO sy-vline 
WA_V_KNA1WRF1_STR-EKOAR sy-vline 
WA_V_KNA1WRF1_STR-KZLIK sy-vline 
WA_V_KNA1WRF1_STR-BETRP sy-vline 
WA_V_KNA1WRF1_STR-NLMATFB sy-vline 
WA_V_KNA1WRF1_STR-BWWRK sy-vline 
WA_V_KNA1WRF1_STR-BWVKO sy-vline 
WA_V_KNA1WRF1_STR-BWVTW sy-vline 
WA_V_KNA1WRF1_STR-BBPRO sy-vline 
WA_V_KNA1WRF1_STR-VKBUR_WRK sy-vline 
WA_V_KNA1WRF1_STR-VLFKZ sy-vline 
WA_V_KNA1WRF1_STR-LSTFL sy-vline      INTO ld_text SEPARATED BY SPACE.

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