ABAP Select data from SAP table RKWTP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKWTP
*  INTO TABLE @DATA(IT_RKWTP2).
*--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_RKWTP INDEX 1 INTO DATA(WA_RKWTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKWTP>-KOKRS = 1.
<RKWTP>-VERSN = 1.
<RKWTP>-GJAHR = 1.
<RKWTP>-FROM = 1.
<RKWTP>-TO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKWTP-DATAB, sy-vline,
  WA_RKWTP-DATBI, sy-vline,
  WA_RKWTP-BOOK, sy-vline,
  WA_RKWTP-LIST, sy-vline,
  WA_RKWTP-BATCH, sy-vline,
  WA_RKWTP-TEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKWTP 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_RKWTP 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_RKWTP INTO WA_RKWTP.


*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_RKWTP-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKWTP-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKWTP-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKWTP-GJAHR.
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_RKWTP_STR, 
KOKRS TYPE STRING,
VERSN TYPE STRING,
GJAHR TYPE STRING,
FROM TYPE STRING,
TO TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
BOOK TYPE STRING,
LIST TYPE STRING,
BATCH TYPE STRING,
TEST TYPE STRING,
SHOWFLG TYPE STRING,
PEPWL TYPE STRING,
REVER TYPE STRING,
VRGNG TYPE STRING,
SIGN_AP TYPE STRING,
SIGN_PSI TYPE STRING,
TCODE TYPE STRING,
REPID TYPE STRING,
WITEM TYPE STRING,
OKEY TYPE STRING,
MSGSEP TYPE STRING,
WLIST TYPE STRING,
MSGDEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKWTP_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_RKWTP_STR-KOKRS sy-vline 
WA_RKWTP_STR-VERSN sy-vline 
WA_RKWTP_STR-GJAHR sy-vline 
WA_RKWTP_STR-FROM sy-vline 
WA_RKWTP_STR-TO sy-vline 
WA_RKWTP_STR-DATAB sy-vline 
WA_RKWTP_STR-DATBI sy-vline 
WA_RKWTP_STR-BOOK sy-vline 
WA_RKWTP_STR-LIST sy-vline 
WA_RKWTP_STR-BATCH sy-vline 
WA_RKWTP_STR-TEST sy-vline 
WA_RKWTP_STR-SHOWFLG sy-vline 
WA_RKWTP_STR-PEPWL sy-vline 
WA_RKWTP_STR-REVER sy-vline 
WA_RKWTP_STR-VRGNG sy-vline 
WA_RKWTP_STR-SIGN_AP sy-vline 
WA_RKWTP_STR-SIGN_PSI sy-vline 
WA_RKWTP_STR-TCODE sy-vline 
WA_RKWTP_STR-REPID sy-vline 
WA_RKWTP_STR-WITEM sy-vline 
WA_RKWTP_STR-OKEY sy-vline 
WA_RKWTP_STR-MSGSEP sy-vline 
WA_RKWTP_STR-WLIST sy-vline 
WA_RKWTP_STR-MSGDEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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