ABAP Select data from SAP table RFKH9 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKH9 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 RFKH9. 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 RFKH9 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_RFKH9 TYPE STANDARD TABLE OF RFKH9,
      WA_RFKH9 TYPE RFKH9,
      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: <RFKH9> TYPE RFKH9.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKH9.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKH9
  INTO TABLE IT_RFKH9.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKH9
*  INTO TABLE @DATA(IT_RFKH92).
*--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_RFKH9 INDEX 1 INTO DATA(WA_RFKH92).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKH9 ASSIGNING <RFKH9>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKH9>-SELT1 = 1.
<RFKH9>-SELW1 = 1.
<RFKH9>-SELFN1 = 1.
<RFKH9>-SELT2 = 1.
<RFKH9>-SELW2 = 1.

ENDLOOP.

LOOP AT IT_RFKH9 INTO WA_RFKH9.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKH9-SELFN2, sy-vline,
  WA_RFKH9-SELT3, sy-vline,
  WA_RFKH9-SELW3, sy-vline,
  WA_RFKH9-SELFN3, sy-vline,
  WA_RFKH9-BETRW, sy-vline,
  WA_RFKH9-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKH9 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_RFKH9 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_RFKH9 INTO WA_RFKH9.


*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_RFKH9_STR, 
SELT1 TYPE STRING,
SELW1 TYPE STRING,
SELFN1 TYPE STRING,
SELT2 TYPE STRING,
SELW2 TYPE STRING,
SELFN2 TYPE STRING,
SELT3 TYPE STRING,
SELW3 TYPE STRING,
SELFN3 TYPE STRING,
BETRW TYPE STRING,
WAERS TYPE STRING,
EXSEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKH9_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_RFKH9_STR-SELT1 sy-vline 
WA_RFKH9_STR-SELW1 sy-vline 
WA_RFKH9_STR-SELFN1 sy-vline 
WA_RFKH9_STR-SELT2 sy-vline 
WA_RFKH9_STR-SELW2 sy-vline 
WA_RFKH9_STR-SELFN2 sy-vline 
WA_RFKH9_STR-SELT3 sy-vline 
WA_RFKH9_STR-SELW3 sy-vline 
WA_RFKH9_STR-SELFN3 sy-vline 
WA_RFKH9_STR-BETRW sy-vline 
WA_RFKH9_STR-WAERS sy-vline 
WA_RFKH9_STR-EXSEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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