ABAP Select data from SAP table RNFPCN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFPCN
*  INTO TABLE @DATA(IT_RNFPCN2).
*--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_RNFPCN INDEX 1 INTO DATA(WA_RNFPCN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFPCN>-COMNUM = 1.
<RNFPCN>-SPOBC = 1.
<RNFPCN>-SPBSC = 1.
<RNFPCN>-SPPDB = 1.
<RNFPCN>-FPBPA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFPCN-FPPA1, sy-vline,
  WA_RNFPCN-FPPA2, sy-vline,
  WA_RNFPCN-PAABA, sy-vline,
  WA_RNFPCN-FPBPU, sy-vline,
  WA_RNFPCN-FPBAA, sy-vline,
  WA_RNFPCN-CYABA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFPCN 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_RNFPCN 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_RNFPCN INTO WA_RNFPCN.


*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_RNFPCN_STR, 
COMNUM TYPE STRING,
SPOBC TYPE STRING,
SPBSC TYPE STRING,
SPPDB TYPE STRING,
FPBPA TYPE STRING,
FPPA1 TYPE STRING,
FPPA2 TYPE STRING,
PAABA TYPE STRING,
FPBPU TYPE STRING,
FPBAA TYPE STRING,
CYABA TYPE STRING,
FOBMI TYPE STRING,
WAERS TYPE STRING,
FPBAC TYPE STRING,
FPBPC TYPE STRING,
FPBSA TYPE STRING,
FPBSC TYPE STRING,
FPBAT TYPE STRING,
FPBPT TYPE STRING,
FPBST TYPE STRING,
FPDPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFPCN_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_RNFPCN_STR-COMNUM sy-vline 
WA_RNFPCN_STR-SPOBC sy-vline 
WA_RNFPCN_STR-SPBSC sy-vline 
WA_RNFPCN_STR-SPPDB sy-vline 
WA_RNFPCN_STR-FPBPA sy-vline 
WA_RNFPCN_STR-FPPA1 sy-vline 
WA_RNFPCN_STR-FPPA2 sy-vline 
WA_RNFPCN_STR-PAABA sy-vline 
WA_RNFPCN_STR-FPBPU sy-vline 
WA_RNFPCN_STR-FPBAA sy-vline 
WA_RNFPCN_STR-CYABA sy-vline 
WA_RNFPCN_STR-FOBMI sy-vline 
WA_RNFPCN_STR-WAERS sy-vline 
WA_RNFPCN_STR-FPBAC sy-vline 
WA_RNFPCN_STR-FPBPC sy-vline 
WA_RNFPCN_STR-FPBSA sy-vline 
WA_RNFPCN_STR-FPBSC sy-vline 
WA_RNFPCN_STR-FPBAT sy-vline 
WA_RNFPCN_STR-FPBPT sy-vline 
WA_RNFPCN_STR-FPBST sy-vline 
WA_RNFPCN_STR-FPDPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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