ABAP Select data from SAP table RKKPI1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKKPI1 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 RKKPI1. 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 RKKPI1 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_RKKPI1 TYPE STANDARD TABLE OF RKKPI1,
      WA_RKKPI1 TYPE RKKPI1,
      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: <RKKPI1> TYPE RKKPI1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKKPI1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKKPI1
  INTO TABLE IT_RKKPI1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKKPI1
*  INTO TABLE @DATA(IT_RKKPI12).
*--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_RKKPI1 INDEX 1 INTO DATA(WA_RKKPI12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKKPI1 ASSIGNING <RKKPI1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKKPI1>-KLVAR = 1.
<RKKPI1>-MATNR = 1.
<RKKPI1>-WERKS = 1.
<RKKPI1>-LOSGR = 1.
<RKKPI1>-TVERS = 1.

ENDLOOP.

LOOP AT IT_RKKPI1 INTO WA_RKKPI1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKKPI1-KADAT, sy-vline,
  WA_RKKPI1-BIDAT, sy-vline,
  WA_RKKPI1-RAWMATERIAL, sy-vline,
  WA_RKKPI1-POSNR, sy-vline,
  WA_RKKPI1-TYPPS, sy-vline,
  WA_RKKPI1-HERK2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKKPI1 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_RKKPI1 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_RKKPI1 INTO WA_RKKPI1.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RKKPI1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKKPI1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEEHT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RKKPI1-MEEHT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKKPI1-MEEHT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KSTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKKPI1-KSTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKKPI1-KSTAR.
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_RKKPI1_STR, 
KLVAR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LOSGR TYPE STRING,
TVERS TYPE STRING,
KADAT TYPE STRING,
BIDAT TYPE STRING,
RAWMATERIAL TYPE STRING,
POSNR TYPE STRING,
TYPPS TYPE STRING,
HERK2 TYPE STRING,
HERK3 TYPE STRING,
MENGE TYPE STRING,
MEEHT TYPE STRING,
PSKNZ TYPE STRING,
LPREIS TYPE STRING,
LTEXT TYPE STRING,
KSTAR TYPE STRING,
EFLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKKPI1_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_RKKPI1_STR-KLVAR sy-vline 
WA_RKKPI1_STR-MATNR sy-vline 
WA_RKKPI1_STR-WERKS sy-vline 
WA_RKKPI1_STR-LOSGR sy-vline 
WA_RKKPI1_STR-TVERS sy-vline 
WA_RKKPI1_STR-KADAT sy-vline 
WA_RKKPI1_STR-BIDAT sy-vline 
WA_RKKPI1_STR-RAWMATERIAL sy-vline 
WA_RKKPI1_STR-POSNR sy-vline 
WA_RKKPI1_STR-TYPPS sy-vline 
WA_RKKPI1_STR-HERK2 sy-vline 
WA_RKKPI1_STR-HERK3 sy-vline 
WA_RKKPI1_STR-MENGE sy-vline 
WA_RKKPI1_STR-MEEHT sy-vline 
WA_RKKPI1_STR-PSKNZ sy-vline 
WA_RKKPI1_STR-LPREIS sy-vline 
WA_RKKPI1_STR-LTEXT sy-vline 
WA_RKKPI1_STR-KSTAR sy-vline 
WA_RKKPI1_STR-EFLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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