ABAP Select data from SAP table RNPK2 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 RNPK2 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 RNPK2. 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 RNPK2 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_RNPK2 TYPE STANDARD TABLE OF RNPK2,
      WA_RNPK2 TYPE RNPK2,
      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: <RNPK2> TYPE RNPK2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNPK2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNPK2
  INTO TABLE IT_RNPK2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNPK2
*  INTO TABLE @DATA(IT_RNPK22).
*--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_RNPK2 INDEX 1 INTO DATA(WA_RNPK22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNPK2 ASSIGNING <RNPK2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNPK2>-NR = 1.
<RNPK2>-MANDT = 1.
<RNPK2>-BELNR = 1.
<RNPK2>-POSNR = 1.
<RNPK2>-TARID = 1.

ENDLOOP.

LOOP AT IT_RNPK2 INTO WA_RNPK2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNPK2-LEIID, sy-vline,
  WA_RNPK2-KOSTR, sy-vline,
  WA_RNPK2-LFDNR, sy-vline,
  WA_RNPK2-BEGDT, sy-vline,
  WA_RNPK2-ENDDT, sy-vline,
  WA_RNPK2-PSTAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNPK2 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_RNPK2 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_RNPK2 INTO WA_RNPK2.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-TARID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-TARID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LEIID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-LEIID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-LEIID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-REFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-REFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-KTART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-KTART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERGBL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPK2-ERGBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPK2-ERGBL.
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_RNPK2_STR, 
NR TYPE STRING,
MANDT TYPE STRING,
BELNR TYPE STRING,
POSNR TYPE STRING,
TARID TYPE STRING,
LEIID TYPE STRING,
KOSTR TYPE STRING,
LFDNR TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
PSTAT TYPE STRING,
ABGDT TYPE STRING,
UEBAB TYPE STRING,
KTEXT TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
VBEGD TYPE STRING,
VENDD TYPE STRING,
VPROZ TYPE STRING,
VPREIS TYPE STRING,
VMENGE TYPE STRING,
VBTRAG TYPE STRING,
KPROZ TYPE STRING,
KBTRAG TYPE STRING,
KPREIS TYPE STRING,
KMENGE TYPE STRING,
REST TYPE STRING,
SEKZ TYPE STRING,
TGRKZ TYPE STRING,
TCODE TYPE STRING,
ABLGR TYPE STRING,
REFNR TYPE STRING,
IVFACT TYPE STRING,
CHECK TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
GBTRAG TYPE STRING,
GMENGE TYPE STRING,
GPREIS TYPE STRING,
KATKB TYPE STRING,
KTART TYPE STRING,
KTXT1 TYPE STRING,
KZ TYPE STRING,
LEINR TYPE STRING,
LNRLS TYPE STRING,
NAME1 TYPE STRING,
MARK TYPE STRING,
NEUKZ TYPE STRING,
PZUSG TYPE STRING,
STATUS TYPE STRING,
STATXT TYPE STRING,
VERKZ TYPE STRING,
ZEITR TYPE STRING,
WAERS TYPE STRING,
ERGKZ TYPE STRING,
ERGBL TYPE STRING,
ERGPS TYPE STRING,
MENGE TYPE STRING,
BETRAG TYPE STRING,
PROZENT TYPE STRING,
BEGINN TYPE STRING,
ENDE TYPE STRING,
NPREIS TYPE STRING,
PRINT TYPE STRING,
MODKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNPK2_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_RNPK2_STR-NR sy-vline 
WA_RNPK2_STR-MANDT sy-vline 
WA_RNPK2_STR-BELNR sy-vline 
WA_RNPK2_STR-POSNR sy-vline 
WA_RNPK2_STR-TARID sy-vline 
WA_RNPK2_STR-LEIID sy-vline 
WA_RNPK2_STR-KOSTR sy-vline 
WA_RNPK2_STR-LFDNR sy-vline 
WA_RNPK2_STR-BEGDT sy-vline 
WA_RNPK2_STR-ENDDT sy-vline 
WA_RNPK2_STR-PSTAT sy-vline 
WA_RNPK2_STR-ABGDT sy-vline 
WA_RNPK2_STR-UEBAB sy-vline 
WA_RNPK2_STR-KTEXT sy-vline 
WA_RNPK2_STR-STORN sy-vline 
WA_RNPK2_STR-STUSR sy-vline 
WA_RNPK2_STR-STDAT sy-vline 
WA_RNPK2_STR-UPDAT sy-vline 
WA_RNPK2_STR-UPUSR sy-vline 
WA_RNPK2_STR-VBEGD sy-vline 
WA_RNPK2_STR-VENDD sy-vline 
WA_RNPK2_STR-VPROZ sy-vline 
WA_RNPK2_STR-VPREIS sy-vline 
WA_RNPK2_STR-VMENGE sy-vline 
WA_RNPK2_STR-VBTRAG sy-vline 
WA_RNPK2_STR-KPROZ sy-vline 
WA_RNPK2_STR-KBTRAG sy-vline 
WA_RNPK2_STR-KPREIS sy-vline 
WA_RNPK2_STR-KMENGE sy-vline 
WA_RNPK2_STR-REST sy-vline 
WA_RNPK2_STR-SEKZ sy-vline 
WA_RNPK2_STR-TGRKZ sy-vline 
WA_RNPK2_STR-TCODE sy-vline 
WA_RNPK2_STR-ABLGR sy-vline 
WA_RNPK2_STR-REFNR sy-vline 
WA_RNPK2_STR-IVFACT sy-vline 
WA_RNPK2_STR-CHECK sy-vline 
WA_RNPK2_STR-EINRI sy-vline 
WA_RNPK2_STR-FALNR sy-vline 
WA_RNPK2_STR-GBTRAG sy-vline 
WA_RNPK2_STR-GMENGE sy-vline 
WA_RNPK2_STR-GPREIS sy-vline 
WA_RNPK2_STR-KATKB sy-vline 
WA_RNPK2_STR-KTART sy-vline 
WA_RNPK2_STR-KTXT1 sy-vline 
WA_RNPK2_STR-KZ sy-vline 
WA_RNPK2_STR-LEINR sy-vline 
WA_RNPK2_STR-LNRLS sy-vline 
WA_RNPK2_STR-NAME1 sy-vline 
WA_RNPK2_STR-MARK sy-vline 
WA_RNPK2_STR-NEUKZ sy-vline 
WA_RNPK2_STR-PZUSG sy-vline 
WA_RNPK2_STR-STATUS sy-vline 
WA_RNPK2_STR-STATXT sy-vline 
WA_RNPK2_STR-VERKZ sy-vline 
WA_RNPK2_STR-ZEITR sy-vline 
WA_RNPK2_STR-WAERS sy-vline 
WA_RNPK2_STR-ERGKZ sy-vline 
WA_RNPK2_STR-ERGBL sy-vline 
WA_RNPK2_STR-ERGPS sy-vline 
WA_RNPK2_STR-MENGE sy-vline 
WA_RNPK2_STR-BETRAG sy-vline 
WA_RNPK2_STR-PROZENT sy-vline 
WA_RNPK2_STR-BEGINN sy-vline 
WA_RNPK2_STR-ENDE sy-vline 
WA_RNPK2_STR-NPREIS sy-vline 
WA_RNPK2_STR-PRINT sy-vline 
WA_RNPK2_STR-MODKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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