ABAP Select data from SAP table RNFP2A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNFP2A 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 RNFP2A. 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 RNFP2A 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_RNFP2A TYPE STANDARD TABLE OF RNFP2A,
      WA_RNFP2A TYPE RNFP2A,
      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: <RNFP2A> TYPE RNFP2A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNFP2A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNFP2A
  INTO TABLE IT_RNFP2A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFP2A
*  INTO TABLE @DATA(IT_RNFP2A2).
*--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_RNFP2A INDEX 1 INTO DATA(WA_RNFP2A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNFP2A ASSIGNING <RNFP2A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFP2A>-KOSTR = 1.
<RNFP2A>-SRNUM = 1.
<RNFP2A>-LFDNR = 1.
<RNFP2A>-VBELN = 1.
<RNFP2A>-VERNR = 1.

ENDLOOP.

LOOP AT IT_RNFP2A INTO WA_RNFP2A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFP2A-AKTKZ, sy-vline,
  WA_RNFP2A-VRGRP, sy-vline,
  WA_RNFP2A-KHGRP, sy-vline,
  WA_RNFP2A-KTFIL, sy-vline,
  WA_RNFP2A-GBDAT, sy-vline,
  WA_RNFP2A-MENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFP2A 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_RNFP2A 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_RNFP2A INTO WA_RNFP2A.


*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 KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SRNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-SRNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-SRNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXTKH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-EXTKH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-EXTKH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-KTART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-KTART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2A-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2A-BELNR.
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_RNFP2A_STR, 
KOSTR TYPE STRING,
SRNUM TYPE STRING,
LFDNR TYPE STRING,
VBELN TYPE STRING,
VERNR TYPE STRING,
AKTKZ TYPE STRING,
VRGRP TYPE STRING,
KHGRP TYPE STRING,
KTFIL TYPE STRING,
GBDAT TYPE STRING,
MENGE TYPE STRING,
GMENG TYPE STRING,
EXTKH TYPE STRING,
VNAME TYPE STRING,
PNAME TYPE STRING,
GRPRS TYPE STRING,
NETWR TYPE STRING,
GBTRG TYPE STRING,
SBBTR TYPE STRING,
SBGES TYPE STRING,
MWSGS TYPE STRING,
ZWSUM TYPE STRING,
ENDSM TYPE STRING,
WAERS TYPE STRING,
ERDAT TYPE STRING,
KTART TYPE STRING,
FKDAT TYPE STRING,
FALNR TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
KNAME TYPE STRING,
STOVM TYPE STRING,
BELNR TYPE STRING,
DIAKY TYPE STRING,
ENTBI TYPE STRING,
RECH1 TYPE STRING,
RECH2 TYPE STRING,
RECH3 TYPE STRING,
PROZE TYPE STRING,
STOKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFP2A_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_RNFP2A_STR-KOSTR sy-vline 
WA_RNFP2A_STR-SRNUM sy-vline 
WA_RNFP2A_STR-LFDNR sy-vline 
WA_RNFP2A_STR-VBELN sy-vline 
WA_RNFP2A_STR-VERNR sy-vline 
WA_RNFP2A_STR-AKTKZ sy-vline 
WA_RNFP2A_STR-VRGRP sy-vline 
WA_RNFP2A_STR-KHGRP sy-vline 
WA_RNFP2A_STR-KTFIL sy-vline 
WA_RNFP2A_STR-GBDAT sy-vline 
WA_RNFP2A_STR-MENGE sy-vline 
WA_RNFP2A_STR-GMENG sy-vline 
WA_RNFP2A_STR-EXTKH sy-vline 
WA_RNFP2A_STR-VNAME sy-vline 
WA_RNFP2A_STR-PNAME sy-vline 
WA_RNFP2A_STR-GRPRS sy-vline 
WA_RNFP2A_STR-NETWR sy-vline 
WA_RNFP2A_STR-GBTRG sy-vline 
WA_RNFP2A_STR-SBBTR sy-vline 
WA_RNFP2A_STR-SBGES sy-vline 
WA_RNFP2A_STR-MWSGS sy-vline 
WA_RNFP2A_STR-ZWSUM sy-vline 
WA_RNFP2A_STR-ENDSM sy-vline 
WA_RNFP2A_STR-WAERS sy-vline 
WA_RNFP2A_STR-ERDAT sy-vline 
WA_RNFP2A_STR-KTART sy-vline 
WA_RNFP2A_STR-FKDAT sy-vline 
WA_RNFP2A_STR-FALNR sy-vline 
WA_RNFP2A_STR-BEGDT sy-vline 
WA_RNFP2A_STR-ENDDT sy-vline 
WA_RNFP2A_STR-KNAME sy-vline 
WA_RNFP2A_STR-STOVM sy-vline 
WA_RNFP2A_STR-BELNR sy-vline 
WA_RNFP2A_STR-DIAKY sy-vline 
WA_RNFP2A_STR-ENTBI sy-vline 
WA_RNFP2A_STR-RECH1 sy-vline 
WA_RNFP2A_STR-RECH2 sy-vline 
WA_RNFP2A_STR-RECH3 sy-vline 
WA_RNFP2A_STR-PROZE sy-vline 
WA_RNFP2A_STR-STOKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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