ABAP Select data from SAP table RK23C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RK23C 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 RK23C. 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 RK23C 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_RK23C TYPE STANDARD TABLE OF RK23C,
      WA_RK23C TYPE RK23C,
      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: <RK23C> TYPE RK23C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RK23C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RK23C
  INTO TABLE IT_RK23C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RK23C
*  INTO TABLE @DATA(IT_RK23C2).
*--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_RK23C INDEX 1 INTO DATA(WA_RK23C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RK23C ASSIGNING <RK23C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RK23C>-WRTTP = 1.
<RK23C>-VERSN = 1.
<RK23C>-KOKRS = 1.
<RK23C>-GJAHR = 1.
<RK23C>-BELTY = 1.

ENDLOOP.

LOOP AT IT_RK23C INTO WA_RK23C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RK23C-HWAER, sy-vline,
  WA_RK23C-FACTR, sy-vline,
  WA_RK23C-TWAER, sy-vline,
  WA_RK23C-PERIO, sy-vline,
  WA_RK23C-ANZBP, sy-vline,
  WA_RK23C-BLART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RK23C 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_RK23C 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_RK23C INTO WA_RK23C.


*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 VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RK23C-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23C-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RK23C-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23C-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RK23C-STBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23C-STBLN.
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_RK23C_STR, 
WRTTP TYPE STRING,
VERSN TYPE STRING,
KOKRS TYPE STRING,
GJAHR TYPE STRING,
BELTY TYPE STRING,
HWAER TYPE STRING,
FACTR TYPE STRING,
TWAER TYPE STRING,
PERIO TYPE STRING,
ANZBP TYPE STRING,
BLART TYPE STRING,
ACTIVITY TYPE STRING,
STORN TYPE STRING,
STOBL TYPE STRING,
STBLN TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
CPUDT TYPE STRING,
USNAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RK23C_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_RK23C_STR-WRTTP sy-vline 
WA_RK23C_STR-VERSN sy-vline 
WA_RK23C_STR-KOKRS sy-vline 
WA_RK23C_STR-GJAHR sy-vline 
WA_RK23C_STR-BELTY sy-vline 
WA_RK23C_STR-HWAER sy-vline 
WA_RK23C_STR-FACTR sy-vline 
WA_RK23C_STR-TWAER sy-vline 
WA_RK23C_STR-PERIO sy-vline 
WA_RK23C_STR-ANZBP sy-vline 
WA_RK23C_STR-BLART sy-vline 
WA_RK23C_STR-ACTIVITY sy-vline 
WA_RK23C_STR-STORN sy-vline 
WA_RK23C_STR-STOBL sy-vline 
WA_RK23C_STR-STBLN sy-vline 
WA_RK23C_STR-BLDAT sy-vline 
WA_RK23C_STR-BUDAT sy-vline 
WA_RK23C_STR-CPUDT sy-vline 
WA_RK23C_STR-USNAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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