ABAP Select data from SAP table RFKH4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKH4 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 RFKH4. 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 RFKH4 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_RFKH4 TYPE STANDARD TABLE OF RFKH4,
      WA_RFKH4 TYPE RFKH4,
      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: <RFKH4> TYPE RFKH4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKH4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKH4
  INTO TABLE IT_RFKH4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKH4
*  INTO TABLE @DATA(IT_RFKH42).
*--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_RFKH4 INDEX 1 INTO DATA(WA_RFKH42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKH4 ASSIGNING <RFKH4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKH4>-XMARK = 1.
<RFKH4>-PAYTP = 1.
<RFKH4>-CHCKN = 1.
<RFKH4>-PSTNO = 1.
<RFKH4>-CCINS = 1.

ENDLOOP.

LOOP AT IT_RFKH4 INTO WA_RFKH4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKH4-CCNUM, sy-vline,
  WA_RFKH4-AUART, sy-vline,
  WA_RFKH4-CCFOL, sy-vline,
  WA_RFKH4-AB_MONAT, sy-vline,
  WA_RFKH4-AB_JAHR, sy-vline,
  WA_RFKH4-BIS_MONAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKH4 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_RFKH4 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_RFKH4 INTO WA_RFKH4.


*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 CDVKO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH4-CDVKO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH4-CDVKO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH4-HKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH4-HKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFNZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH4-REFNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH4-REFNZ.
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_RFKH4_STR, 
XMARK TYPE STRING,
PAYTP TYPE STRING,
CHCKN TYPE STRING,
PSTNO TYPE STRING,
CCINS TYPE STRING,
CCNUM TYPE STRING,
AUART TYPE STRING,
CCFOL TYPE STRING,
AB_MONAT TYPE STRING,
AB_JAHR TYPE STRING,
BIS_MONAT TYPE STRING,
BIS_JAHR TYPE STRING,
BETRS TYPE STRING,
BETRZ TYPE STRING,
BETRA TYPE STRING,
WAERS TYPE STRING,
CDVKO TYPE STRING,
HKONT TYPE STRING,
KEYZ1 TYPE STRING,
TXTVW TYPE STRING,
KOINH TYPE STRING,
INFOF TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
BKREF TYPE STRING,
REFNZ TYPE STRING,
BANKS TYPE STRING,
BKONT TYPE STRING,
XPGRO TYPE STRING,
XDETA TYPE STRING,
DICON TYPE STRING,
VALUT TYPE STRING,
AUNUM TYPE STRING,
NOCARD_INS TYPE STRING,
CVVAL TYPE STRING,
CCNAME TYPE STRING,
CVVCT TYPE STRING,
CVVST TYPE STRING,
MERCH TYPE STRING,
AMTCC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKH4_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_RFKH4_STR-XMARK sy-vline 
WA_RFKH4_STR-PAYTP sy-vline 
WA_RFKH4_STR-CHCKN sy-vline 
WA_RFKH4_STR-PSTNO sy-vline 
WA_RFKH4_STR-CCINS sy-vline 
WA_RFKH4_STR-CCNUM sy-vline 
WA_RFKH4_STR-AUART sy-vline 
WA_RFKH4_STR-CCFOL sy-vline 
WA_RFKH4_STR-AB_MONAT sy-vline 
WA_RFKH4_STR-AB_JAHR sy-vline 
WA_RFKH4_STR-BIS_MONAT sy-vline 
WA_RFKH4_STR-BIS_JAHR sy-vline 
WA_RFKH4_STR-BETRS sy-vline 
WA_RFKH4_STR-BETRZ sy-vline 
WA_RFKH4_STR-BETRA sy-vline 
WA_RFKH4_STR-WAERS sy-vline 
WA_RFKH4_STR-CDVKO sy-vline 
WA_RFKH4_STR-HKONT sy-vline 
WA_RFKH4_STR-KEYZ1 sy-vline 
WA_RFKH4_STR-TXTVW sy-vline 
WA_RFKH4_STR-KOINH sy-vline 
WA_RFKH4_STR-INFOF sy-vline 
WA_RFKH4_STR-BANKL sy-vline 
WA_RFKH4_STR-BANKN sy-vline 
WA_RFKH4_STR-BKREF sy-vline 
WA_RFKH4_STR-REFNZ sy-vline 
WA_RFKH4_STR-BANKS sy-vline 
WA_RFKH4_STR-BKONT sy-vline 
WA_RFKH4_STR-XPGRO sy-vline 
WA_RFKH4_STR-XDETA sy-vline 
WA_RFKH4_STR-DICON sy-vline 
WA_RFKH4_STR-VALUT sy-vline 
WA_RFKH4_STR-AUNUM sy-vline 
WA_RFKH4_STR-NOCARD_INS sy-vline 
WA_RFKH4_STR-CVVAL sy-vline 
WA_RFKH4_STR-CCNAME sy-vline 
WA_RFKH4_STR-CVVCT sy-vline 
WA_RFKH4_STR-CVVST sy-vline 
WA_RFKH4_STR-MERCH sy-vline 
WA_RFKH4_STR-AMTCC sy-vline      INTO ld_text SEPARATED BY SPACE.

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