ABAP Select data from SAP table RPCWPCXX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPCWPCXX
*  INTO TABLE @DATA(IT_RPCWPCXX2).
*--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_RPCWPCXX INDEX 1 INTO DATA(WA_RPCWPCXX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPCWPCXX>-REDAT = 1.
<RPCWPCXX>-ZWIND_DAT = 1.
<RPCWPCXX>-ZWIND_ALT = 1.
<RPCWPCXX>-TRACE = 1.
<RPCWPCXX>-KLAUF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPCWPCXX-CHKRS, sy-vline,
  WA_RPCWPCXX-KORRL, sy-vline,
  WA_RPCWPCXX-KOMPR, sy-vline,
  WA_RPCWPCXX-ACOPY, sy-vline,
  WA_RPCWPCXX-LCOPY, sy-vline,
  WA_RPCWPCXX-BASUB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPCWPCXX 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_RPCWPCXX 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_RPCWPCXX INTO WA_RPCWPCXX.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RPCWPCXX_STR, 
REDAT TYPE STRING,
ZWIND_DAT TYPE STRING,
ZWIND_ALT TYPE STRING,
TRACE TYPE STRING,
KLAUF TYPE STRING,
CHKRS TYPE STRING,
KORRL TYPE STRING,
KOMPR TYPE STRING,
ACOPY TYPE STRING,
LCOPY TYPE STRING,
BASUB TYPE STRING,
PRAKT TYPE STRING,
PRDTL TYPE STRING,
PRDIF TYPE STRING,
PRPNR TYPE STRING,
UBUPD TYPE STRING,
VLIST TYPE STRING,
VZKOR TYPE STRING,
SIMUL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPCWPCXX_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_RPCWPCXX_STR-REDAT sy-vline 
WA_RPCWPCXX_STR-ZWIND_DAT sy-vline 
WA_RPCWPCXX_STR-ZWIND_ALT sy-vline 
WA_RPCWPCXX_STR-TRACE sy-vline 
WA_RPCWPCXX_STR-KLAUF sy-vline 
WA_RPCWPCXX_STR-CHKRS sy-vline 
WA_RPCWPCXX_STR-KORRL sy-vline 
WA_RPCWPCXX_STR-KOMPR sy-vline 
WA_RPCWPCXX_STR-ACOPY sy-vline 
WA_RPCWPCXX_STR-LCOPY sy-vline 
WA_RPCWPCXX_STR-BASUB sy-vline 
WA_RPCWPCXX_STR-PRAKT sy-vline 
WA_RPCWPCXX_STR-PRDTL sy-vline 
WA_RPCWPCXX_STR-PRDIF sy-vline 
WA_RPCWPCXX_STR-PRPNR sy-vline 
WA_RPCWPCXX_STR-UBUPD sy-vline 
WA_RPCWPCXX_STR-VLIST sy-vline 
WA_RPCWPCXX_STR-VZKOR sy-vline 
WA_RPCWPCXX_STR-SIMUL sy-vline      INTO ld_text SEPARATED BY SPACE.

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