ABAP Select data from SAP table RFKI4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKI4 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 RFKI4. 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 RFKI4 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_RFKI4 TYPE STANDARD TABLE OF RFKI4,
      WA_RFKI4 TYPE RFKI4,
      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: <RFKI4> TYPE RFKI4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKI4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKI4
  INTO TABLE IT_RFKI4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKI4
*  INTO TABLE @DATA(IT_RFKI42).
*--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_RFKI4 INDEX 1 INTO DATA(WA_RFKI42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKI4 ASSIGNING <RFKI4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKI4>-APPLK = 1.
<RFKI4>-AKTYP = 1.
<RFKI4>-LAUFD = 1.
<RFKI4>-LAUFI = 1.
<RFKI4>-CASHDEP = 1.

ENDLOOP.

LOOP AT IT_RFKI4 INTO WA_RFKI4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKI4-AUSDT, sy-vline,
  WA_RFKI4-BUDAT, sy-vline,
  WA_RFKI4-BLART, sy-vline,
  WA_RFKI4-WAERS, sy-vline,
  WA_RFKI4-STAKZ, sy-vline,
  WA_RFKI4-AUGRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKI4 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_RFKI4 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_RFKI4 INTO WA_RFKI4.


*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_RFKI4_STR, 
APPLK TYPE STRING,
AKTYP TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
CASHDEP TYPE STRING,
AUSDT TYPE STRING,
BUDAT TYPE STRING,
BLART TYPE STRING,
WAERS TYPE STRING,
STAKZ TYPE STRING,
AUGRS TYPE STRING,
VZBIS TYPE STRING,
XOPEN TYPE STRING,
XCLOSED TYPE STRING,
XCORSP TYPE STRING,
CREDIT TYPE STRING,
DEBIT TYPE STRING,
DEBCRED TYPE STRING,
OBJECT TYPE STRING,
VARI TYPE STRING,
LIMIT TYPE STRING,
PROBCLASS TYPE STRING,
XSIMU TYPE STRING,
XNOBOLLO TYPE STRING,
XVKINTDOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKI4_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_RFKI4_STR-APPLK sy-vline 
WA_RFKI4_STR-AKTYP sy-vline 
WA_RFKI4_STR-LAUFD sy-vline 
WA_RFKI4_STR-LAUFI sy-vline 
WA_RFKI4_STR-CASHDEP sy-vline 
WA_RFKI4_STR-AUSDT sy-vline 
WA_RFKI4_STR-BUDAT sy-vline 
WA_RFKI4_STR-BLART sy-vline 
WA_RFKI4_STR-WAERS sy-vline 
WA_RFKI4_STR-STAKZ sy-vline 
WA_RFKI4_STR-AUGRS sy-vline 
WA_RFKI4_STR-VZBIS sy-vline 
WA_RFKI4_STR-XOPEN sy-vline 
WA_RFKI4_STR-XCLOSED sy-vline 
WA_RFKI4_STR-XCORSP sy-vline 
WA_RFKI4_STR-CREDIT sy-vline 
WA_RFKI4_STR-DEBIT sy-vline 
WA_RFKI4_STR-DEBCRED sy-vline 
WA_RFKI4_STR-OBJECT sy-vline 
WA_RFKI4_STR-VARI sy-vline 
WA_RFKI4_STR-LIMIT sy-vline 
WA_RFKI4_STR-PROBCLASS sy-vline 
WA_RFKI4_STR-XSIMU sy-vline 
WA_RFKI4_STR-XNOBOLLO sy-vline 
WA_RFKI4_STR-XVKINTDOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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