ABAP Select data from SAP table RKPU2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKPU2 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 RKPU2. 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 RKPU2 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_RKPU2 TYPE STANDARD TABLE OF RKPU2,
      WA_RKPU2 TYPE RKPU2,
      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: <RKPU2> TYPE RKPU2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKPU2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKPU2
  INTO TABLE IT_RKPU2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKPU2
*  INTO TABLE @DATA(IT_RKPU22).
*--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_RKPU2 INDEX 1 INTO DATA(WA_RKPU22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKPU2 ASSIGNING <RKPU2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKPU2>-PROCESSING = 1.
<RKPU2>-BATCHFLG = 1.
<RKPU2>-TESTFLG = 1.
<RKPU2>-LISTFLG = 1.
<RKPU2>-ALPARA = 1.

ENDLOOP.

LOOP AT IT_RKPU2 INTO WA_RKPU2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKPU2-KOKRS, sy-vline,
  WA_RKPU2-GJAHR, sy-vline,
  WA_RKPU2-VERSN, sy-vline,
  WA_RKPU2-UMWRT, sy-vline,
  WA_RKPU2-FRPER, sy-vline,
  WA_RKPU2-TOPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKPU2 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_RKPU2 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_RKPU2 INTO WA_RKPU2.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKPU2-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPU2-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKPU2-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPU2-VERSN.
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_RKPU2_STR, 
PROCESSING TYPE STRING,
BATCHFLG TYPE STRING,
TESTFLG TYPE STRING,
LISTFLG TYPE STRING,
ALPARA TYPE STRING,
KOKRS TYPE STRING,
GJAHR TYPE STRING,
VERSN TYPE STRING,
UMWRT TYPE STRING,
FRPER TYPE STRING,
TOPER TYPE STRING,
TXT TYPE STRING,
TAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKPU2_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_RKPU2_STR-PROCESSING sy-vline 
WA_RKPU2_STR-BATCHFLG sy-vline 
WA_RKPU2_STR-TESTFLG sy-vline 
WA_RKPU2_STR-LISTFLG sy-vline 
WA_RKPU2_STR-ALPARA sy-vline 
WA_RKPU2_STR-KOKRS sy-vline 
WA_RKPU2_STR-GJAHR sy-vline 
WA_RKPU2_STR-VERSN sy-vline 
WA_RKPU2_STR-UMWRT sy-vline 
WA_RKPU2_STR-FRPER sy-vline 
WA_RKPU2_STR-TOPER sy-vline 
WA_RKPU2_STR-TXT sy-vline 
WA_RKPU2_STR-TAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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