ABAP Select data from SAP table RFKH2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKH2 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 RFKH2. 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 RFKH2 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_RFKH2 TYPE STANDARD TABLE OF RFKH2,
      WA_RFKH2 TYPE RFKH2,
      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: <RFKH2> TYPE RFKH2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKH2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKH2
  INTO TABLE IT_RFKH2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKH2
*  INTO TABLE @DATA(IT_RFKH22).
*--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_RFKH2 INDEX 1 INTO DATA(WA_RFKH22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKH2 ASSIGNING <RFKH2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKH2>-MANDT = 1.
<RFKH2>-KEYZ1 = 1.
<RFKH2>-FKEYS = 1.
<RFKH2>-KEYZ2 = 1.
<RFKH2>-BANKL = 1.

ENDLOOP.

LOOP AT IT_RFKH2 INTO WA_RFKH2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKH2-BANKN, sy-vline,
  WA_RFKH2-CHCKN, sy-vline,
  WA_RFKH2-XBLNR, sy-vline,
  WA_RFKH2-XPGRO, sy-vline,
  WA_RFKH2-TXTVW, sy-vline,
  WA_RFKH2-KOINH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKH2 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_RFKH2 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_RFKH2 INTO WA_RFKH2.


*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 XBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH2-XBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH2-XBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFNZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKH2-REFNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKH2-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_RFKH2_STR, 
MANDT TYPE STRING,
KEYZ1 TYPE STRING,
FKEYS TYPE STRING,
KEYZ2 TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
CHCKN TYPE STRING,
XBLNR TYPE STRING,
XPGRO TYPE STRING,
TXTVW TYPE STRING,
KOINH TYPE STRING,
BKONT TYPE STRING,
BANKS TYPE STRING,
INFOF TYPE STRING,
PSTNO TYPE STRING,
REFNZ TYPE STRING,
BKREF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKH2_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_RFKH2_STR-MANDT sy-vline 
WA_RFKH2_STR-KEYZ1 sy-vline 
WA_RFKH2_STR-FKEYS sy-vline 
WA_RFKH2_STR-KEYZ2 sy-vline 
WA_RFKH2_STR-BANKL sy-vline 
WA_RFKH2_STR-BANKN sy-vline 
WA_RFKH2_STR-CHCKN sy-vline 
WA_RFKH2_STR-XBLNR sy-vline 
WA_RFKH2_STR-XPGRO sy-vline 
WA_RFKH2_STR-TXTVW sy-vline 
WA_RFKH2_STR-KOINH sy-vline 
WA_RFKH2_STR-BKONT sy-vline 
WA_RFKH2_STR-BANKS sy-vline 
WA_RFKH2_STR-INFOF sy-vline 
WA_RFKH2_STR-PSTNO sy-vline 
WA_RFKH2_STR-REFNZ sy-vline 
WA_RFKH2_STR-BKREF sy-vline      INTO ld_text SEPARATED BY SPACE.

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