ABAP Select data from SAP table RNPD0 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 RNPD0 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 RNPD0. 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 RNPD0 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_RNPD0 TYPE STANDARD TABLE OF RNPD0,
      WA_RNPD0 TYPE RNPD0,
      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: <RNPD0> TYPE RNPD0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNPD0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNPD0
  INTO TABLE IT_RNPD0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNPD0
*  INTO TABLE @DATA(IT_RNPD02).
*--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_RNPD0 INDEX 1 INTO DATA(WA_RNPD02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNPD0 ASSIGNING <RNPD0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNPD0>-EINRI = 1.
<RNPD0>-FALNR = 1.
<RNPD0>-LFDNR = 1.
<RNPD0>-KOSTR = 1.
<RNPD0>-LNRLS = 1.

ENDLOOP.

LOOP AT IT_RNPD0 INTO WA_RNPD0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNPD0-ABTAR, sy-vline,
  WA_RNPD0-ABLST, sy-vline,
  WA_RNPD0-LFDBEW, sy-vline,
  WA_RNPD0-ZEITR, sy-vline,
  WA_RNPD0-MENGE, sy-vline,
  WA_RNPD0-BEGDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNPD0 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_RNPD0 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_RNPD0 INTO WA_RNPD0.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-ABTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-ABTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABLST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPD0-ABLST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPD0-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_RNPD0_STR, 
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
KOSTR TYPE STRING,
LNRLS TYPE STRING,
ABTAR TYPE STRING,
ABLST TYPE STRING,
LFDBEW TYPE STRING,
ZEITR TYPE STRING,
MENGE TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
EXCAT TYPE STRING,
BRUWR TYPE STRING,
VPREIS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNPD0_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_RNPD0_STR-EINRI sy-vline 
WA_RNPD0_STR-FALNR sy-vline 
WA_RNPD0_STR-LFDNR sy-vline 
WA_RNPD0_STR-KOSTR sy-vline 
WA_RNPD0_STR-LNRLS sy-vline 
WA_RNPD0_STR-ABTAR sy-vline 
WA_RNPD0_STR-ABLST sy-vline 
WA_RNPD0_STR-LFDBEW sy-vline 
WA_RNPD0_STR-ZEITR sy-vline 
WA_RNPD0_STR-MENGE sy-vline 
WA_RNPD0_STR-BEGDT sy-vline 
WA_RNPD0_STR-ENDDT sy-vline 
WA_RNPD0_STR-EXCAT sy-vline 
WA_RNPD0_STR-BRUWR sy-vline 
WA_RNPD0_STR-VPREIS sy-vline      INTO ld_text SEPARATED BY SPACE.

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