ABAP Select data from SAP table RFKH8 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKH8 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 RFKH8. 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 RFKH8 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_RFKH8 TYPE STANDARD TABLE OF RFKH8,
      WA_RFKH8 TYPE RFKH8,
      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: <RFKH8> TYPE RFKH8.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKH8.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKH8
  INTO TABLE IT_RFKH8.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKH8
*  INTO TABLE @DATA(IT_RFKH82).
*--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_RFKH8 INDEX 1 INTO DATA(WA_RFKH82).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKH8 ASSIGNING <RFKH8>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKH8>-OFFIC = 1.
<RFKH8>-CHDSK = 1.
<RFKH8>-ERNAM = 1.
<RFKH8>-ERDAT = 1.
<RFKH8>-BUKRS = 1.

ENDLOOP.

LOOP AT IT_RFKH8 INTO WA_RFKH8.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKH8-GSBER, sy-vline,
  WA_RFKH8-BVRKO, sy-vline,
  WA_RFKH8-PAYTP, sy-vline,
  WA_RFKH8-WAERS, sy-vline,
  WA_RFKH8-BLDAT, sy-vline,
  WA_RFKH8-BUDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKH8 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_RFKH8 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_RFKH8 INTO WA_RFKH8.


*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 BVRKO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH8-BVRKO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH8-BVRKO.
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_RFKH8_STR, 
OFFIC TYPE STRING,
CHDSK TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
BUKRS TYPE STRING,
GSBER TYPE STRING,
BVRKO TYPE STRING,
PAYTP TYPE STRING,
WAERS TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
VALUT TYPE STRING,
CCINS TYPE STRING,
BEZ30 TYPE STRING,
KEYZ1 TYPE STRING,
STAZS TYPE STRING,
TCUEB TYPE STRING,
XMARK TYPE STRING,
MERCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKH8_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_RFKH8_STR-OFFIC sy-vline 
WA_RFKH8_STR-CHDSK sy-vline 
WA_RFKH8_STR-ERNAM sy-vline 
WA_RFKH8_STR-ERDAT sy-vline 
WA_RFKH8_STR-BUKRS sy-vline 
WA_RFKH8_STR-GSBER sy-vline 
WA_RFKH8_STR-BVRKO sy-vline 
WA_RFKH8_STR-PAYTP sy-vline 
WA_RFKH8_STR-WAERS sy-vline 
WA_RFKH8_STR-BLDAT sy-vline 
WA_RFKH8_STR-BUDAT sy-vline 
WA_RFKH8_STR-VALUT sy-vline 
WA_RFKH8_STR-CCINS sy-vline 
WA_RFKH8_STR-BEZ30 sy-vline 
WA_RFKH8_STR-KEYZ1 sy-vline 
WA_RFKH8_STR-STAZS sy-vline 
WA_RFKH8_STR-TCUEB sy-vline 
WA_RFKH8_STR-XMARK sy-vline 
WA_RFKH8_STR-MERCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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