ABAP Select data from SAP table RFKZ0KL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKZ0KL 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 RFKZ0KL. 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 RFKZ0KL 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_RFKZ0KL TYPE STANDARD TABLE OF RFKZ0KL,
      WA_RFKZ0KL TYPE RFKZ0KL,
      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: <RFKZ0KL> TYPE RFKZ0KL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKZ0KL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKZ0KL
  INTO TABLE IT_RFKZ0KL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKZ0KL
*  INTO TABLE @DATA(IT_RFKZ0KL2).
*--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_RFKZ0KL INDEX 1 INTO DATA(WA_RFKZ0KL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKZ0KL ASSIGNING <RFKZ0KL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKZ0KL>-XVOSO = 1.
<RFKZ0KL>-XVORQ = 1.
<RFKZ0KL>-XANVW = 1.
<RFKZ0KL>-XANBK = 1.
<RFKZ0KL>-XANKL = 1.

ENDLOOP.

LOOP AT IT_RFKZ0KL INTO WA_RFKZ0KL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKZ0KL-XZAER, sy-vline,
  WA_RFKZ0KL-XZAIG, sy-vline,
  WA_RFKZ0KL-MONZA, sy-vline,
  WA_RFKZ0KL-XFBER, sy-vline,
  WA_RFKZ0KL-XFBIG, sy-vline,
  WA_RFKZ0KL-TAGFA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKZ0KL 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_RFKZ0KL 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_RFKZ0KL INTO WA_RFKZ0KL.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RFKZ0KL_STR, 
XVOSO TYPE STRING,
XVORQ TYPE STRING,
XANVW TYPE STRING,
XANBK TYPE STRING,
XANKL TYPE STRING,
XZAER TYPE STRING,
XZAIG TYPE STRING,
MONZA TYPE STRING,
XFBER TYPE STRING,
XFBIG TYPE STRING,
TAGFA TYPE STRING,
XBSIN TYPE STRING,
XBSAK TYPE STRING,
POLIM TYPE STRING,
MAXKV TYPE STRING,
XNOMS TYPE STRING,
XCDIS TYPE STRING,
PCSEL TYPE STRING,
XCNTE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKZ0KL_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_RFKZ0KL_STR-XVOSO sy-vline 
WA_RFKZ0KL_STR-XVORQ sy-vline 
WA_RFKZ0KL_STR-XANVW sy-vline 
WA_RFKZ0KL_STR-XANBK sy-vline 
WA_RFKZ0KL_STR-XANKL sy-vline 
WA_RFKZ0KL_STR-XZAER sy-vline 
WA_RFKZ0KL_STR-XZAIG sy-vline 
WA_RFKZ0KL_STR-MONZA sy-vline 
WA_RFKZ0KL_STR-XFBER sy-vline 
WA_RFKZ0KL_STR-XFBIG sy-vline 
WA_RFKZ0KL_STR-TAGFA sy-vline 
WA_RFKZ0KL_STR-XBSIN sy-vline 
WA_RFKZ0KL_STR-XBSAK sy-vline 
WA_RFKZ0KL_STR-POLIM sy-vline 
WA_RFKZ0KL_STR-MAXKV sy-vline 
WA_RFKZ0KL_STR-XNOMS sy-vline 
WA_RFKZ0KL_STR-XCDIS sy-vline 
WA_RFKZ0KL_STR-PCSEL sy-vline 
WA_RFKZ0KL_STR-XCNTE sy-vline      INTO ld_text SEPARATED BY SPACE.

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