ABAP Select data from SAP table RNFP2 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNFP2 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 RNFP2. 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 RNFP2 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_RNFP2 TYPE STANDARD TABLE OF RNFP2,
      WA_RNFP2 TYPE RNFP2,
      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: <RNFP2> TYPE RNFP2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNFP2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNFP2
  INTO TABLE IT_RNFP2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFP2
*  INTO TABLE @DATA(IT_RNFP22).
*--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_RNFP2 INDEX 1 INTO DATA(WA_RNFP22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNFP2 ASSIGNING <RNFP2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFP2>-KOSTR = 1.
<RNFP2>-FALNR = 1.
<RNFP2>-VBELN = 1.
<RNFP2>-BELNR = 1.
<RNFP2>-VERNN = 1.

ENDLOOP.

LOOP AT IT_RNFP2 INTO WA_RNFP2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFP2-VERVN, sy-vline,
  WA_RNFP2-GBDAT, sy-vline,
  WA_RNFP2-AKTKZ, sy-vline,
  WA_RNFP2-ABDAT, sy-vline,
  WA_RNFP2-BETRG, sy-vline,
  WA_RNFP2-AHW_BETRG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFP2 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_RNFP2 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_RNFP2 INTO WA_RNFP2.


*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_RNFP2-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABLST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFP2-ABLST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFP2-ABLST.
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_RNFP2_STR, 
KOSTR TYPE STRING,
FALNR TYPE STRING,
VBELN TYPE STRING,
BELNR TYPE STRING,
VERNN TYPE STRING,
VERVN TYPE STRING,
GBDAT TYPE STRING,
AKTKZ TYPE STRING,
ABDAT TYPE STRING,
BETRG TYPE STRING,
AHW_BETRG TYPE STRING,
GBTRG TYPE STRING,
AHW_GBTRG TYPE STRING,
EABKZ TYPE STRING,
WAERS TYPE STRING,
AHWAERS TYPE STRING,
AUFDT TYPE STRING,
ENTDT TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
NBTRG TYPE STRING,
AHW_NBTRG TYPE STRING,
PBTRG TYPE STRING,
AHW_PBTRG TYPE STRING,
ABTRG TYPE STRING,
AHW_ABTRG TYPE STRING,
STORN TYPE STRING,
ABLST TYPE STRING,
LTEXT TYPE STRING,
ERDAT TYPE STRING,
BRUWR TYPE STRING,
AHW_BRUWR TYPE STRING,
DIFWR TYPE STRING,
AHW_DIFWR TYPE STRING,
MWSBP TYPE STRING,
AHW_MWSBP TYPE STRING,
VERNR TYPE STRING,
MGART TYPE STRING,
MENGE TYPE STRING,
PREIS TYPE STRING,
NETWR TYPE STRING,
KDUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFP2_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_RNFP2_STR-KOSTR sy-vline 
WA_RNFP2_STR-FALNR sy-vline 
WA_RNFP2_STR-VBELN sy-vline 
WA_RNFP2_STR-BELNR sy-vline 
WA_RNFP2_STR-VERNN sy-vline 
WA_RNFP2_STR-VERVN sy-vline 
WA_RNFP2_STR-GBDAT sy-vline 
WA_RNFP2_STR-AKTKZ sy-vline 
WA_RNFP2_STR-ABDAT sy-vline 
WA_RNFP2_STR-BETRG sy-vline 
WA_RNFP2_STR-AHW_BETRG sy-vline 
WA_RNFP2_STR-GBTRG sy-vline 
WA_RNFP2_STR-AHW_GBTRG sy-vline 
WA_RNFP2_STR-EABKZ sy-vline 
WA_RNFP2_STR-WAERS sy-vline 
WA_RNFP2_STR-AHWAERS sy-vline 
WA_RNFP2_STR-AUFDT sy-vline 
WA_RNFP2_STR-ENTDT sy-vline 
WA_RNFP2_STR-BEGDT sy-vline 
WA_RNFP2_STR-ENDDT sy-vline 
WA_RNFP2_STR-NBTRG sy-vline 
WA_RNFP2_STR-AHW_NBTRG sy-vline 
WA_RNFP2_STR-PBTRG sy-vline 
WA_RNFP2_STR-AHW_PBTRG sy-vline 
WA_RNFP2_STR-ABTRG sy-vline 
WA_RNFP2_STR-AHW_ABTRG sy-vline 
WA_RNFP2_STR-STORN sy-vline 
WA_RNFP2_STR-ABLST sy-vline 
WA_RNFP2_STR-LTEXT sy-vline 
WA_RNFP2_STR-ERDAT sy-vline 
WA_RNFP2_STR-BRUWR sy-vline 
WA_RNFP2_STR-AHW_BRUWR sy-vline 
WA_RNFP2_STR-DIFWR sy-vline 
WA_RNFP2_STR-AHW_DIFWR sy-vline 
WA_RNFP2_STR-MWSBP sy-vline 
WA_RNFP2_STR-AHW_MWSBP sy-vline 
WA_RNFP2_STR-VERNR sy-vline 
WA_RNFP2_STR-MGART sy-vline 
WA_RNFP2_STR-MENGE sy-vline 
WA_RNFP2_STR-PREIS sy-vline 
WA_RNFP2_STR-NETWR sy-vline 
WA_RNFP2_STR-KDUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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