ABAP Select data from SAP table VZKNA1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VZKNA1 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 VZKNA1. 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 VZKNA1 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_VZKNA1 TYPE STANDARD TABLE OF VZKNA1,
      WA_VZKNA1 TYPE VZKNA1,
      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: <VZKNA1> TYPE VZKNA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VZKNA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VZKNA1
  INTO TABLE IT_VZKNA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZKNA1
*  INTO TABLE @DATA(IT_VZKNA12).
*--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_VZKNA1 INDEX 1 INTO DATA(WA_VZKNA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VZKNA1 ASSIGNING <VZKNA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZKNA1>-MANDT = 1.
<VZKNA1>-KUNNR = 1.
<VZKNA1>-ANRED = 1.
<VZKNA1>-BBBNR = 1.
<VZKNA1>-BBSNR = 1.

ENDLOOP.

LOOP AT IT_VZKNA1 INTO WA_VZKNA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZKNA1-BEGRU, sy-vline,
  WA_VZKNA1-BRSCH, sy-vline,
  WA_VZKNA1-BUBKZ, sy-vline,
  WA_VZKNA1-DATLT, sy-vline,
  WA_VZKNA1-FISKN, sy-vline,
  WA_VZKNA1-KNRZA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZKNA1 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_VZKNA1 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_VZKNA1 INTO WA_VZKNA1.


*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_VZKNA1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FISKN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNA1-FISKN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-FISKN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNA1-KNRZA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-KNRZA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNA1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNA1-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBUND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZKNA1-VBUND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZKNA1-VBUND.
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_VZKNA1_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
ANRED TYPE STRING,
BBBNR TYPE STRING,
BBSNR TYPE STRING,
BEGRU TYPE STRING,
BRSCH TYPE STRING,
BUBKZ TYPE STRING,
DATLT TYPE STRING,
FISKN TYPE STRING,
KNRZA TYPE STRING,
KONZS TYPE STRING,
KTOKD TYPE STRING,
LAND1 TYPE STRING,
LIFNR TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAME3 TYPE STRING,
NAME4 TYPE STRING,
ORT01 TYPE STRING,
ORT02 TYPE STRING,
PFACH TYPE STRING,
PSTL2 TYPE STRING,
PSTLZ TYPE STRING,
REGIO TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
SORTL TYPE STRING,
SPRAS TYPE STRING,
STCD1 TYPE STRING,
STCD2 TYPE STRING,
STKZA TYPE STRING,
STKZU TYPE STRING,
STRAS TYPE STRING,
TELBX TYPE STRING,
TELF1 TYPE STRING,
TELF2 TYPE STRING,
TELFX TYPE STRING,
TELTX TYPE STRING,
TELX1 TYPE STRING,
XZEMP TYPE STRING,
VBUND TYPE STRING,
STCEG TYPE STRING,
STKZN TYPE STRING,
LOEVM TYPE STRING,
SPERR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZKNA1_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_VZKNA1_STR-MANDT sy-vline 
WA_VZKNA1_STR-KUNNR sy-vline 
WA_VZKNA1_STR-ANRED sy-vline 
WA_VZKNA1_STR-BBBNR sy-vline 
WA_VZKNA1_STR-BBSNR sy-vline 
WA_VZKNA1_STR-BEGRU sy-vline 
WA_VZKNA1_STR-BRSCH sy-vline 
WA_VZKNA1_STR-BUBKZ sy-vline 
WA_VZKNA1_STR-DATLT sy-vline 
WA_VZKNA1_STR-FISKN sy-vline 
WA_VZKNA1_STR-KNRZA sy-vline 
WA_VZKNA1_STR-KONZS sy-vline 
WA_VZKNA1_STR-KTOKD sy-vline 
WA_VZKNA1_STR-LAND1 sy-vline 
WA_VZKNA1_STR-LIFNR sy-vline 
WA_VZKNA1_STR-NAME1 sy-vline 
WA_VZKNA1_STR-NAME2 sy-vline 
WA_VZKNA1_STR-NAME3 sy-vline 
WA_VZKNA1_STR-NAME4 sy-vline 
WA_VZKNA1_STR-ORT01 sy-vline 
WA_VZKNA1_STR-ORT02 sy-vline 
WA_VZKNA1_STR-PFACH sy-vline 
WA_VZKNA1_STR-PSTL2 sy-vline 
WA_VZKNA1_STR-PSTLZ sy-vline 
WA_VZKNA1_STR-REGIO sy-vline 
WA_VZKNA1_STR-COUNC sy-vline 
WA_VZKNA1_STR-CITYC sy-vline 
WA_VZKNA1_STR-SORTL sy-vline 
WA_VZKNA1_STR-SPRAS sy-vline 
WA_VZKNA1_STR-STCD1 sy-vline 
WA_VZKNA1_STR-STCD2 sy-vline 
WA_VZKNA1_STR-STKZA sy-vline 
WA_VZKNA1_STR-STKZU sy-vline 
WA_VZKNA1_STR-STRAS sy-vline 
WA_VZKNA1_STR-TELBX sy-vline 
WA_VZKNA1_STR-TELF1 sy-vline 
WA_VZKNA1_STR-TELF2 sy-vline 
WA_VZKNA1_STR-TELFX sy-vline 
WA_VZKNA1_STR-TELTX sy-vline 
WA_VZKNA1_STR-TELX1 sy-vline 
WA_VZKNA1_STR-XZEMP sy-vline 
WA_VZKNA1_STR-VBUND sy-vline 
WA_VZKNA1_STR-STCEG sy-vline 
WA_VZKNA1_STR-STKZN sy-vline 
WA_VZKNA1_STR-LOEVM sy-vline 
WA_VZKNA1_STR-SPERR sy-vline      INTO ld_text SEPARATED BY SPACE.

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