ABAP Select data from SAP table RFKC1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKC1 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 RFKC1. 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 RFKC1 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_RFKC1 TYPE STANDARD TABLE OF RFKC1,
      WA_RFKC1 TYPE RFKC1,
      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: <RFKC1> TYPE RFKC1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKC1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKC1
  INTO TABLE IT_RFKC1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKC1
*  INTO TABLE @DATA(IT_RFKC12).
*--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_RFKC1 INDEX 1 INTO DATA(WA_RFKC12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKC1 ASSIGNING <RFKC1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKC1>-APPLK = 1.
<RFKC1>-ABWBL = 1.
<RFKC1>-GPART = 1.
<RFKC1>-VKONT = 1.
<RFKC1>-VKONTSR = 1.

ENDLOOP.

LOOP AT IT_RFKC1 INTO WA_RFKC1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKC1-VKONTSA, sy-vline,
  WA_RFKC1-BUDAT, sy-vline,
  WA_RFKC1-BLDAT, sy-vline,
  WA_RFKC1-BLART, sy-vline,
  WA_RFKC1-CRNEWSR, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RFKC1 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_RFKC1 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_RFKC1 INTO WA_RFKC1.


*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 ABWBL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKC1-ABWBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKC1-ABWBL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKC1-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKC1-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKC1-VKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKC1-VKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONTSR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKC1-VKONTSR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKC1-VKONTSR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONTSA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKC1-VKONTSA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKC1-VKONTSA.
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_RFKC1_STR, 
APPLK TYPE STRING,
ABWBL TYPE STRING,
GPART TYPE STRING,
VKONT TYPE STRING,
VKONTSR TYPE STRING,
VKONTSA TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
BLART TYPE STRING,
CRNEWSR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKC1_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_RFKC1_STR-APPLK sy-vline 
WA_RFKC1_STR-ABWBL sy-vline 
WA_RFKC1_STR-GPART sy-vline 
WA_RFKC1_STR-VKONT sy-vline 
WA_RFKC1_STR-VKONTSR sy-vline 
WA_RFKC1_STR-VKONTSA sy-vline 
WA_RFKC1_STR-BUDAT sy-vline 
WA_RFKC1_STR-BLDAT sy-vline 
WA_RFKC1_STR-BLART sy-vline 
WA_RFKC1_STR-CRNEWSR sy-vline      INTO ld_text SEPARATED BY SPACE.

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