ABAP Select data from SAP table RNFKL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFKL
*  INTO TABLE @DATA(IT_RNFKL2).
*--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_RNFKL INDEX 1 INTO DATA(WA_RNFKL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFKL>-LFDKLF = 1.
<RNFKL>-EINRI = 1.
<RNFKL>-FALNR = 1.
<RNFKL>-FZIFF = 1.
<RNFKL>-MARK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFKL-VON_TAG, sy-vline,
  WA_RNFKL-BIS_TAG, sy-vline,
  WA_RNFKL-KLFTYP, sy-vline,
  WA_RNFKL-KLFART, sy-vline,
  WA_RNFKL-KLFART_INT, sy-vline,
  WA_RNFKL-KLFATXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFKL 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_RNFKL 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_RNFKL INTO WA_RNFKL.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ZIMMR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFKL-ZIMMR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFKL-ZIMMR.
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_RNFKL_STR, 
LFDKLF TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
FZIFF TYPE STRING,
MARK TYPE STRING,
VON_TAG TYPE STRING,
BIS_TAG TYPE STRING,
KLFTYP TYPE STRING,
KLFART TYPE STRING,
KLFART_INT TYPE STRING,
KLFATXT TYPE STRING,
KLFART_PRE TYPE STRING,
KLFATX_PRE TYPE STRING,
PGRA TYPE STRING,
PGRS TYPE STRING,
PGRKB TYPE STRING,
PGRA_PREV TYPE STRING,
PGRS_PREV TYPE STRING,
PGRKB_PREV TYPE STRING,
FKLEDT TYPE STRING,
FKLEZT TYPE STRING,
FKLBDT TYPE STRING,
FKLBZT TYPE STRING,
FKLEDT_PRE TYPE STRING,
FKLEZT_PRE TYPE STRING,
FKLBDT_PRE TYPE STRING,
FKLBZT_PRE TYPE STRING,
SELDT TYPE STRING,
SELZT TYPE STRING,
PNAME TYPE STRING,
NNAME TYPE STRING,
NNAMS TYPE STRING,
VNAMS TYPE STRING,
ALTER TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
ORGKB_PF TYPE STRING,
ZIMMR TYPE STRING,
VCODE TYPE STRING,
UPDKZ TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFKL_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_RNFKL_STR-LFDKLF sy-vline 
WA_RNFKL_STR-EINRI sy-vline 
WA_RNFKL_STR-FALNR sy-vline 
WA_RNFKL_STR-FZIFF sy-vline 
WA_RNFKL_STR-MARK sy-vline 
WA_RNFKL_STR-VON_TAG sy-vline 
WA_RNFKL_STR-BIS_TAG sy-vline 
WA_RNFKL_STR-KLFTYP sy-vline 
WA_RNFKL_STR-KLFART sy-vline 
WA_RNFKL_STR-KLFART_INT sy-vline 
WA_RNFKL_STR-KLFATXT sy-vline 
WA_RNFKL_STR-KLFART_PRE sy-vline 
WA_RNFKL_STR-KLFATX_PRE sy-vline 
WA_RNFKL_STR-PGRA sy-vline 
WA_RNFKL_STR-PGRS sy-vline 
WA_RNFKL_STR-PGRKB sy-vline 
WA_RNFKL_STR-PGRA_PREV sy-vline 
WA_RNFKL_STR-PGRS_PREV sy-vline 
WA_RNFKL_STR-PGRKB_PREV sy-vline 
WA_RNFKL_STR-FKLEDT sy-vline 
WA_RNFKL_STR-FKLEZT sy-vline 
WA_RNFKL_STR-FKLBDT sy-vline 
WA_RNFKL_STR-FKLBZT sy-vline 
WA_RNFKL_STR-FKLEDT_PRE sy-vline 
WA_RNFKL_STR-FKLEZT_PRE sy-vline 
WA_RNFKL_STR-FKLBDT_PRE sy-vline 
WA_RNFKL_STR-FKLBZT_PRE sy-vline 
WA_RNFKL_STR-SELDT sy-vline 
WA_RNFKL_STR-SELZT sy-vline 
WA_RNFKL_STR-PNAME sy-vline 
WA_RNFKL_STR-NNAME sy-vline 
WA_RNFKL_STR-NNAMS sy-vline 
WA_RNFKL_STR-VNAMS sy-vline 
WA_RNFKL_STR-ALTER sy-vline 
WA_RNFKL_STR-ORGFA sy-vline 
WA_RNFKL_STR-ORGPF sy-vline 
WA_RNFKL_STR-ORGKB_PF sy-vline 
WA_RNFKL_STR-ZIMMR sy-vline 
WA_RNFKL_STR-VCODE sy-vline 
WA_RNFKL_STR-UPDKZ sy-vline 
WA_RNFKL_STR-ERDAT sy-vline 
WA_RNFKL_STR-ERUSR sy-vline      INTO ld_text SEPARATED BY SPACE.

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