ABAP Select data from SAP table KNA1_FS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNA1_FS 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 KNA1_FS. 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 KNA1_FS 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_KNA1_FS TYPE STANDARD TABLE OF KNA1_FS,
      WA_KNA1_FS TYPE KNA1_FS,
      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: <KNA1_FS> TYPE KNA1_FS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KNA1_FS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KNA1_FS
  INTO TABLE IT_KNA1_FS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNA1_FS
*  INTO TABLE @DATA(IT_KNA1_FS2).
*--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_KNA1_FS INDEX 1 INTO DATA(WA_KNA1_FS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KNA1_FS ASSIGNING <KNA1_FS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNA1_FS>-LAND1 = 1.
<KNA1_FS>-ORT01 = 1.
<KNA1_FS>-PSTLZ = 1.
<KNA1_FS>-REGIO = 1.
<KNA1_FS>-SORTL = 1.

ENDLOOP.

LOOP AT IT_KNA1_FS INTO WA_KNA1_FS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNA1_FS-XCPDK, sy-vline,
  WA_KNA1_FS-BRSCH, sy-vline,
  WA_KNA1_FS-ERDAT, sy-vline,
  WA_KNA1_FS-ERNAM, sy-vline,
  WA_KNA1_FS-KONZS, sy-vline,
  WA_KNA1_FS-KTOKD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNA1_FS 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_KNA1_FS 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_KNA1_FS INTO WA_KNA1_FS.


*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_KNA1_FS-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNA1_FS-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBUND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNA1_FS-VBUND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNA1_FS-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_KNA1_FS_STR, 
LAND1 TYPE STRING,
ORT01 TYPE STRING,
PSTLZ TYPE STRING,
REGIO TYPE STRING,
SORTL TYPE STRING,
XCPDK TYPE STRING,
BRSCH TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
KONZS TYPE STRING,
KTOKD TYPE STRING,
LIFNR TYPE STRING,
LIFSD TYPE STRING,
LOEVM TYPE STRING,
PFACH TYPE STRING,
PSTL2 TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
SPERR TYPE STRING,
STCD1 TYPE STRING,
STCD2 TYPE STRING,
XZEMP TYPE STRING,
VBUND TYPE STRING,
STCEG TYPE STRING,
TXJCD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNA1_FS_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_KNA1_FS_STR-LAND1 sy-vline 
WA_KNA1_FS_STR-ORT01 sy-vline 
WA_KNA1_FS_STR-PSTLZ sy-vline 
WA_KNA1_FS_STR-REGIO sy-vline 
WA_KNA1_FS_STR-SORTL sy-vline 
WA_KNA1_FS_STR-XCPDK sy-vline 
WA_KNA1_FS_STR-BRSCH sy-vline 
WA_KNA1_FS_STR-ERDAT sy-vline 
WA_KNA1_FS_STR-ERNAM sy-vline 
WA_KNA1_FS_STR-KONZS sy-vline 
WA_KNA1_FS_STR-KTOKD sy-vline 
WA_KNA1_FS_STR-LIFNR sy-vline 
WA_KNA1_FS_STR-LIFSD sy-vline 
WA_KNA1_FS_STR-LOEVM sy-vline 
WA_KNA1_FS_STR-PFACH sy-vline 
WA_KNA1_FS_STR-PSTL2 sy-vline 
WA_KNA1_FS_STR-COUNC sy-vline 
WA_KNA1_FS_STR-CITYC sy-vline 
WA_KNA1_FS_STR-SPERR sy-vline 
WA_KNA1_FS_STR-STCD1 sy-vline 
WA_KNA1_FS_STR-STCD2 sy-vline 
WA_KNA1_FS_STR-XZEMP sy-vline 
WA_KNA1_FS_STR-VBUND sy-vline 
WA_KNA1_FS_STR-STCEG sy-vline 
WA_KNA1_FS_STR-TXJCD sy-vline      INTO ld_text SEPARATED BY SPACE.

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