ABAP Select data from SAP table RKATDT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKATDT
*  INTO TABLE @DATA(IT_RKATDT2).
*--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_RKATDT INDEX 1 INTO DATA(WA_RKATDT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKATDT>-PERIO = 1.
<RKATDT>-TKEXXX = 1.
<RKATDT>-KWAER = 1.
<RKATDT>-TKGXXX = 1.
<RKATDT>-TKVXXX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKATDT-TKFXXX, sy-vline,
  WA_RKATDT-TOEXXX, sy-vline,
  WA_RKATDT-OWAER, sy-vline,
  WA_RKATDT-TOGXXX, sy-vline,
  WA_RKATDT-TOVXXX, sy-vline,
  WA_RKATDT-TOFXXX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKATDT 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_RKATDT 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_RKATDT INTO WA_RKATDT.


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

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

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

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

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

*Conversion exit AC112, internal->external for field TOFXXX
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATDT-TOFXXX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATDT-TOFXXX.
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_RKATDT_STR, 
PERIO TYPE STRING,
TKEXXX TYPE STRING,
KWAER TYPE STRING,
TKGXXX TYPE STRING,
TKVXXX TYPE STRING,
TKFXXX TYPE STRING,
TOEXXX TYPE STRING,
OWAER TYPE STRING,
TOGXXX TYPE STRING,
TOVXXX TYPE STRING,
TOFXXX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKATDT_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_RKATDT_STR-PERIO sy-vline 
WA_RKATDT_STR-TKEXXX sy-vline 
WA_RKATDT_STR-KWAER sy-vline 
WA_RKATDT_STR-TKGXXX sy-vline 
WA_RKATDT_STR-TKVXXX sy-vline 
WA_RKATDT_STR-TKFXXX sy-vline 
WA_RKATDT_STR-TOEXXX sy-vline 
WA_RKATDT_STR-OWAER sy-vline 
WA_RKATDT_STR-TOGXXX sy-vline 
WA_RKATDT_STR-TOVXXX sy-vline 
WA_RKATDT_STR-TOFXXX sy-vline      INTO ld_text SEPARATED BY SPACE.

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