ABAP Select data from SAP table RKATKL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKATKL
*  INTO TABLE @DATA(IT_RKATKL2).
*--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_RKATKL INDEX 1 INTO DATA(WA_RKATKL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKATKL>-KOSTL = 1.
<RKATKL>-KSKTXT = 1.
<RKATKL>-LSTAR = 1.
<RKATKL>-LAKTXT = 1.
<RKATKL>-TARKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKATKL-WRTTP, sy-vline,
  WA_RKATKL-TARVKZ, sy-vline,
  WA_RKATKL-KWAER, sy-vline,
  WA_RKATKL-TKEMIN, sy-vline,
  WA_RKATKL-TKGMEAN, sy-vline,
  WA_RKATKL-TKVMEAN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKATKL 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_RKATKL 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_RKATKL INTO WA_RKATKL.


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

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

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

*Conversion exit AC112, internal->external for field TKGMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TKGMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TKGMEAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKVMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TKVMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TKVMEAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKFMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TKFMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TKFMEAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOGMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TOGMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TOGMEAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOVMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TOVMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TOVMEAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOFMEAN
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKL-TOFMEAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKL-TOFMEAN.
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_RKATKL_STR, 
KOSTL TYPE STRING,
KSKTXT TYPE STRING,
LSTAR TYPE STRING,
LAKTXT TYPE STRING,
TARKZ TYPE STRING,
WRTTP TYPE STRING,
TARVKZ TYPE STRING,
KWAER TYPE STRING,
TKEMIN TYPE STRING,
TKGMEAN TYPE STRING,
TKVMEAN TYPE STRING,
TKFMEAN TYPE STRING,
OWAER TYPE STRING,
TOEMIN TYPE STRING,
TOGMEAN TYPE STRING,
TOVMEAN TYPE STRING,
TOFMEAN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKATKL_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_RKATKL_STR-KOSTL sy-vline 
WA_RKATKL_STR-KSKTXT sy-vline 
WA_RKATKL_STR-LSTAR sy-vline 
WA_RKATKL_STR-LAKTXT sy-vline 
WA_RKATKL_STR-TARKZ sy-vline 
WA_RKATKL_STR-WRTTP sy-vline 
WA_RKATKL_STR-TARVKZ sy-vline 
WA_RKATKL_STR-KWAER sy-vline 
WA_RKATKL_STR-TKEMIN sy-vline 
WA_RKATKL_STR-TKGMEAN sy-vline 
WA_RKATKL_STR-TKVMEAN sy-vline 
WA_RKATKL_STR-TKFMEAN sy-vline 
WA_RKATKL_STR-OWAER sy-vline 
WA_RKATKL_STR-TOEMIN sy-vline 
WA_RKATKL_STR-TOGMEAN sy-vline 
WA_RKATKL_STR-TOVMEAN sy-vline 
WA_RKATKL_STR-TOFMEAN sy-vline      INTO ld_text SEPARATED BY SPACE.

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