ABAP Select data from SAP table RCRKK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCRKK
*  INTO TABLE @DATA(IT_RCRKK2).
*--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_RCRKK INDEX 1 INTO DATA(WA_RCRKK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCRKK>-AZMAX = 1.
<RCRKK>-AZNOR = 1.
<RCRKK>-BEGZT = 1.
<RCRKK>-EINZH = 1.
<RCRKK>-ENDZT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCRKK-KALID, sy-vline,
  WA_RCRKK-KAPAR, sy-vline,
  WA_RCRKK-KAPID, sy-vline,
  WA_RCRKK-KAPAH, sy-vline,
  WA_RCRKK-KTEXT, sy-vline,
  WA_RCRKK-NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCRKK 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_RCRKK 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_RCRKK INTO WA_RCRKK.


*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_RCRKK_STR, 
AZMAX TYPE STRING,
AZNOR TYPE STRING,
BEGZT TYPE STRING,
EINZH TYPE STRING,
ENDZT TYPE STRING,
KALID TYPE STRING,
KAPAR TYPE STRING,
KAPID TYPE STRING,
KAPAH TYPE STRING,
KTEXT TYPE STRING,
NAME TYPE STRING,
WERKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCRKK_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_RCRKK_STR-AZMAX sy-vline 
WA_RCRKK_STR-AZNOR sy-vline 
WA_RCRKK_STR-BEGZT sy-vline 
WA_RCRKK_STR-EINZH sy-vline 
WA_RCRKK_STR-ENDZT sy-vline 
WA_RCRKK_STR-KALID sy-vline 
WA_RCRKK_STR-KAPAR sy-vline 
WA_RCRKK_STR-KAPID sy-vline 
WA_RCRKK_STR-KAPAH sy-vline 
WA_RCRKK_STR-KTEXT sy-vline 
WA_RCRKK_STR-NAME sy-vline 
WA_RCRKK_STR-WERKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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