ABAP Select data from SAP table RNFPZ_LIST_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNFPZ_LIST_ALV
*  INTO TABLE @DATA(IT_RNFPZ_LIST_ALV2).
*--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_RNFPZ_LIST_ALV INDEX 1 INTO DATA(WA_RNFPZ_LIST_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNFPZ_LIST_ALV>-PERNR = 1.
<RNFPZ_LIST_ALV>-PNAME = 1.
<RNFPZ_LIST_ALV>-TYPTX = 1.
<RNFPZ_LIST_ALV>-BEGDT = 1.
<RNFPZ_LIST_ALV>-ENDDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNFPZ_LIST_ALV-ZUGBW, sy-vline,
  WA_RNFPZ_LIST_ALV-PADDR, sy-vline,
  WA_RNFPZ_LIST_ALV-KZTXT, sy-vline,
  WA_RNFPZ_LIST_ALV-LGTXT, sy-vline,
  WA_RNFPZ_LIST_ALV-EARZT, sy-vline,
  WA_RNFPZ_LIST_ALV-FARZT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNFPZ_LIST_ALV 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_RNFPZ_LIST_ALV 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_RNFPZ_LIST_ALV INTO WA_RNFPZ_LIST_ALV.


*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 PERNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNFPZ_LIST_ALV-PERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNFPZ_LIST_ALV-PERNR.
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_RNFPZ_LIST_ALV_STR, 
PERNR TYPE STRING,
PNAME TYPE STRING,
TYPTX TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
ZUGBW TYPE STRING,
PADDR TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
EARZT TYPE STRING,
FARZT TYPE STRING,
LFDNR TYPE STRING,
LFDBW TYPE STRING,
LANR TYPE STRING,
BSNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNFPZ_LIST_ALV_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_RNFPZ_LIST_ALV_STR-PERNR sy-vline 
WA_RNFPZ_LIST_ALV_STR-PNAME sy-vline 
WA_RNFPZ_LIST_ALV_STR-TYPTX sy-vline 
WA_RNFPZ_LIST_ALV_STR-BEGDT sy-vline 
WA_RNFPZ_LIST_ALV_STR-ENDDT sy-vline 
WA_RNFPZ_LIST_ALV_STR-ZUGBW sy-vline 
WA_RNFPZ_LIST_ALV_STR-PADDR sy-vline 
WA_RNFPZ_LIST_ALV_STR-KZTXT sy-vline 
WA_RNFPZ_LIST_ALV_STR-LGTXT sy-vline 
WA_RNFPZ_LIST_ALV_STR-EARZT sy-vline 
WA_RNFPZ_LIST_ALV_STR-FARZT sy-vline 
WA_RNFPZ_LIST_ALV_STR-LFDNR sy-vline 
WA_RNFPZ_LIST_ALV_STR-LFDBW sy-vline 
WA_RNFPZ_LIST_ALV_STR-LANR sy-vline 
WA_RNFPZ_LIST_ALV_STR-BSNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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