ABAP Select data from SAP table RFKL0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKL0 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 RFKL0. 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 RFKL0 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_RFKL0 TYPE STANDARD TABLE OF RFKL0,
      WA_RFKL0 TYPE RFKL0,
      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: <RFKL0> TYPE RFKL0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKL0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKL0
  INTO TABLE IT_RFKL0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKL0
*  INTO TABLE @DATA(IT_RFKL02).
*--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_RFKL0 INDEX 1 INTO DATA(WA_RFKL02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKL0 ASSIGNING <RFKL0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKL0>-AZEI1 = 1.
<RFKL0>-AZEI2 = 1.
<RFKL0>-BISDT = 1.
<RFKL0>-BISSL_TXT = 1.
<RFKL0>-BISSL = 1.

ENDLOOP.

LOOP AT IT_RFKL0 INTO WA_RFKL0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKL0-BISWT, sy-vline,
  WA_RFKL0-CUKWT, sy-vline,
  WA_RFKL0-EVENT, sy-vline,
  WA_RFKL0-FIKEY, sy-vline,
  WA_RFKL0-FLINE, sy-vline,
  WA_RFKL0-ICONT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKL0 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_RFKL0 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_RFKL0 INTO WA_RFKL0.


*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_RFKL0_STR, 
AZEI1 TYPE STRING,
AZEI2 TYPE STRING,
BISDT TYPE STRING,
BISSL_TXT TYPE STRING,
BISSL TYPE STRING,
BISWT TYPE STRING,
CUKWT TYPE STRING,
EVENT TYPE STRING,
FIKEY TYPE STRING,
FLINE TYPE STRING,
ICONT TYPE STRING,
KOART TYPE STRING,
LSTCL TYPE STRING,
LTEXT TYPE STRING,
LTEXT_S TYPE STRING,
PARAMID TYPE STRING,
SRTFO TYPE STRING,
SRTFO_S TYPE STRING,
TABNAME TYPE STRING,
TOTAL TYPE STRING,
TEXT2 TYPE STRING,
TITEL TYPE STRING,
VARAK TYPE STRING,
VARNR TYPE STRING,
VONDT TYPE STRING,
VONSL TYPE STRING,
VONWT TYPE STRING,
VRBEZ TYPE STRING,
XABSO TYPE STRING,
XABSO_FUN TYPE STRING,
XALL_F4 TYPE STRING,
XSIGN TYPE STRING,
XUSA_F4 TYPE STRING,
XUSR_F4 TYPE STRING,
XCLS_F4 TYPE STRING,
XOPN_F4 TYPE STRING,
XCORR TYPE STRING,
XDESC TYPE STRING,
XINIT TYPE STRING,
XODER TYPE STRING,
XODER_FUN TYPE STRING,
XSELK TYPE STRING,
XSUCH TYPE STRING,
XSUMA TYPE STRING,
XSUMA_FLD TYPE STRING,
XUND TYPE STRING,
XUSSL TYPE STRING,
XVALU TYPE STRING,
XUEB_F4 TYPE STRING,
XEXCL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKL0_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_RFKL0_STR-AZEI1 sy-vline 
WA_RFKL0_STR-AZEI2 sy-vline 
WA_RFKL0_STR-BISDT sy-vline 
WA_RFKL0_STR-BISSL_TXT sy-vline 
WA_RFKL0_STR-BISSL sy-vline 
WA_RFKL0_STR-BISWT sy-vline 
WA_RFKL0_STR-CUKWT sy-vline 
WA_RFKL0_STR-EVENT sy-vline 
WA_RFKL0_STR-FIKEY sy-vline 
WA_RFKL0_STR-FLINE sy-vline 
WA_RFKL0_STR-ICONT sy-vline 
WA_RFKL0_STR-KOART sy-vline 
WA_RFKL0_STR-LSTCL sy-vline 
WA_RFKL0_STR-LTEXT sy-vline 
WA_RFKL0_STR-LTEXT_S sy-vline 
WA_RFKL0_STR-PARAMID sy-vline 
WA_RFKL0_STR-SRTFO sy-vline 
WA_RFKL0_STR-SRTFO_S sy-vline 
WA_RFKL0_STR-TABNAME sy-vline 
WA_RFKL0_STR-TOTAL sy-vline 
WA_RFKL0_STR-TEXT2 sy-vline 
WA_RFKL0_STR-TITEL sy-vline 
WA_RFKL0_STR-VARAK sy-vline 
WA_RFKL0_STR-VARNR sy-vline 
WA_RFKL0_STR-VONDT sy-vline 
WA_RFKL0_STR-VONSL sy-vline 
WA_RFKL0_STR-VONWT sy-vline 
WA_RFKL0_STR-VRBEZ sy-vline 
WA_RFKL0_STR-XABSO sy-vline 
WA_RFKL0_STR-XABSO_FUN sy-vline 
WA_RFKL0_STR-XALL_F4 sy-vline 
WA_RFKL0_STR-XSIGN sy-vline 
WA_RFKL0_STR-XUSA_F4 sy-vline 
WA_RFKL0_STR-XUSR_F4 sy-vline 
WA_RFKL0_STR-XCLS_F4 sy-vline 
WA_RFKL0_STR-XOPN_F4 sy-vline 
WA_RFKL0_STR-XCORR sy-vline 
WA_RFKL0_STR-XDESC sy-vline 
WA_RFKL0_STR-XINIT sy-vline 
WA_RFKL0_STR-XODER sy-vline 
WA_RFKL0_STR-XODER_FUN sy-vline 
WA_RFKL0_STR-XSELK sy-vline 
WA_RFKL0_STR-XSUCH sy-vline 
WA_RFKL0_STR-XSUMA sy-vline 
WA_RFKL0_STR-XSUMA_FLD sy-vline 
WA_RFKL0_STR-XUND sy-vline 
WA_RFKL0_STR-XUSSL sy-vline 
WA_RFKL0_STR-XVALU sy-vline 
WA_RFKL0_STR-XUEB_F4 sy-vline 
WA_RFKL0_STR-XEXCL sy-vline      INTO ld_text SEPARATED BY SPACE.

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