ABAP Select data from SAP table CUKN_OBJ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CUKN_OBJ
*  INTO TABLE @DATA(IT_CUKN_OBJ2).
*--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_CUKN_OBJ INDEX 1 INTO DATA(WA_CUKN_OBJ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CUKN_OBJ>-MANDT = 1.
<CUKN_OBJ>-KNNUM = 1.
<CUKN_OBJ>-ADZHL = 1.
<CUKN_OBJ>-KNCNT = 1.
<CUKN_OBJ>-LKENZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CUKN_OBJ-AENNR, sy-vline,
  WA_CUKN_OBJ-DATUV, sy-vline,
  WA_CUKN_OBJ-DATUB, sy-vline,
  WA_CUKN_OBJ-KNBKL, sy-vline,
  WA_CUKN_OBJ-KNBLK, sy-vline,
  WA_CUKN_OBJ-KNMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CUKN_OBJ 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_CUKN_OBJ 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_CUKN_OBJ INTO WA_CUKN_OBJ.


*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 AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CUKN_OBJ-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CUKN_OBJ-AENNR.
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_CUKN_OBJ_STR, 
MANDT TYPE STRING,
KNNUM TYPE STRING,
ADZHL TYPE STRING,
KNCNT TYPE STRING,
LKENZ TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
DATUB TYPE STRING,
KNBKL TYPE STRING,
KNBLK TYPE STRING,
KNMOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CUKN_OBJ_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_CUKN_OBJ_STR-MANDT sy-vline 
WA_CUKN_OBJ_STR-KNNUM sy-vline 
WA_CUKN_OBJ_STR-ADZHL sy-vline 
WA_CUKN_OBJ_STR-KNCNT sy-vline 
WA_CUKN_OBJ_STR-LKENZ sy-vline 
WA_CUKN_OBJ_STR-AENNR sy-vline 
WA_CUKN_OBJ_STR-DATUV sy-vline 
WA_CUKN_OBJ_STR-DATUB sy-vline 
WA_CUKN_OBJ_STR-KNBKL sy-vline 
WA_CUKN_OBJ_STR-KNBLK sy-vline 
WA_CUKN_OBJ_STR-KNMOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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