ABAP Select data from SAP table RPCAK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPCAK
*  INTO TABLE @DATA(IT_RPCAK2).
*--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_RPCAK INDEX 1 INTO DATA(WA_RPCAK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPCAK>-MANDT = 1.
<RPCAK>-KTOPL = 1.
<RPCAK>-KOKRS = 1.
<RPCAK>-BUKRS = 1.
<RPCAK>-RACCT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPCAK-KATYP, sy-vline,
  WA_RPCAK-XBILK, sy-vline,
  WA_RPCAK-DATBI, sy-vline,
  WA_RPCAK-DATAB, sy-vline,
  WA_RPCAK-MSEHI, sy-vline,
  WA_RPCAK-SPRAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPCAK 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_RPCAK 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_RPCAK INTO WA_RPCAK.


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

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

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

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RPCAK-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RPCAK-SPRAS.
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_RPCAK_STR, 
MANDT TYPE STRING,
KTOPL TYPE STRING,
KOKRS TYPE STRING,
BUKRS TYPE STRING,
RACCT TYPE STRING,
KATYP TYPE STRING,
XBILK TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
MSEHI TYPE STRING,
SPRAS TYPE STRING,
KTEXT TYPE STRING,
LTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPCAK_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_RPCAK_STR-MANDT sy-vline 
WA_RPCAK_STR-KTOPL sy-vline 
WA_RPCAK_STR-KOKRS sy-vline 
WA_RPCAK_STR-BUKRS sy-vline 
WA_RPCAK_STR-RACCT sy-vline 
WA_RPCAK_STR-KATYP sy-vline 
WA_RPCAK_STR-XBILK sy-vline 
WA_RPCAK_STR-DATBI sy-vline 
WA_RPCAK_STR-DATAB sy-vline 
WA_RPCAK_STR-MSEHI sy-vline 
WA_RPCAK_STR-SPRAS sy-vline 
WA_RPCAK_STR-KTEXT sy-vline 
WA_RPCAK_STR-LTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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