ABAP Select data from SAP table RNFPCS into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNFPCS 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 RNFPCS. 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 RNFPCS 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_RNFPCS TYPE STANDARD TABLE OF RNFPCS,
      WA_RNFPCS TYPE RNFPCS,
      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: <RNFPCS> TYPE RNFPCS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFPCS
*  INTO TABLE @DATA(IT_RNFPCS2).
*--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_RNFPCS INDEX 1 INTO DATA(WA_RNFPCS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFPCS>-TAKAT = 1.
<RNFPCS>-RANK = 1.
<RNFPCS>-KTEXT = 1.
<RNFPCS>-LTEXT = 1.
<RNFPCS>-VBELN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFPCS-POSNR, sy-vline,
  WA_RNFPCS-MENGE, sy-vline,
  WA_RNFPCS-MEINH, sy-vline,
  WA_RNFPCS-ERDAT, sy-vline,
  WA_RNFPCS-BRUWR, sy-vline,
  WA_RNFPCS-NETWR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFPCS 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_RNFPCS 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_RNFPCS INTO WA_RNFPCS.


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

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

*Conversion exit CUNIT, internal->external for field MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNFPCS-MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFPCS-MEINH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field USER0
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFPCS-USER0
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFPCS-USER0.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field USER1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFPCS-USER1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFPCS-USER1.
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_RNFPCS_STR, 
TAKAT TYPE STRING,
RANK TYPE STRING,
KTEXT TYPE STRING,
LTEXT TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
MENGE TYPE STRING,
MEINH TYPE STRING,
ERDAT TYPE STRING,
BRUWR TYPE STRING,
NETWR TYPE STRING,
MWSBP TYPE STRING,
TGPRS TYPE STRING,
WAERS TYPE STRING,
USER0 TYPE STRING,
USER1 TYPE STRING,
USRAMT1 TYPE STRING,
USRAMT2 TYPE STRING,
USRTXT1 TYPE STRING,
USRTXT2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFPCS_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_RNFPCS_STR-TAKAT sy-vline 
WA_RNFPCS_STR-RANK sy-vline 
WA_RNFPCS_STR-KTEXT sy-vline 
WA_RNFPCS_STR-LTEXT sy-vline 
WA_RNFPCS_STR-VBELN sy-vline 
WA_RNFPCS_STR-POSNR sy-vline 
WA_RNFPCS_STR-MENGE sy-vline 
WA_RNFPCS_STR-MEINH sy-vline 
WA_RNFPCS_STR-ERDAT sy-vline 
WA_RNFPCS_STR-BRUWR sy-vline 
WA_RNFPCS_STR-NETWR sy-vline 
WA_RNFPCS_STR-MWSBP sy-vline 
WA_RNFPCS_STR-TGPRS sy-vline 
WA_RNFPCS_STR-WAERS sy-vline 
WA_RNFPCS_STR-USER0 sy-vline 
WA_RNFPCS_STR-USER1 sy-vline 
WA_RNFPCS_STR-USRAMT1 sy-vline 
WA_RNFPCS_STR-USRAMT2 sy-vline 
WA_RNFPCS_STR-USRTXT1 sy-vline 
WA_RNFPCS_STR-USRTXT2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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