ABAP Select data from SAP table CUKN_STRUC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CUKN_STRUC 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_STRUC. 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_STRUC 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_STRUC TYPE STANDARD TABLE OF CUKN_STRUC,
      WA_CUKN_STRUC TYPE CUKN_STRUC,
      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_STRUC> TYPE CUKN_STRUC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CUKN_STRUC
*  INTO TABLE @DATA(IT_CUKN_STRUC2).
*--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_STRUC INDEX 1 INTO DATA(WA_CUKN_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CUKN_STRUC>-COUNTER = 1.
<CUKN_STRUC>-LINE01 = 1.
<CUKN_STRUC>-LINE02 = 1.
<CUKN_STRUC>-LINE03 = 1.
<CUKN_STRUC>-LINE04 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CUKN_STRUC-LINE05, sy-vline,
  WA_CUKN_STRUC-LINE06, sy-vline,
  WA_CUKN_STRUC-LINE07, sy-vline,
  WA_CUKN_STRUC-LINE08, sy-vline,
  WA_CUKN_STRUC-LINE09, sy-vline,
  WA_CUKN_STRUC-LINE10, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CUKN_STRUC 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_STRUC 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_STRUC INTO WA_CUKN_STRUC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CUKN_STRUC_STR, 
COUNTER TYPE STRING,
LINE01 TYPE STRING,
LINE02 TYPE STRING,
LINE03 TYPE STRING,
LINE04 TYPE STRING,
LINE05 TYPE STRING,
LINE06 TYPE STRING,
LINE07 TYPE STRING,
LINE08 TYPE STRING,
LINE09 TYPE STRING,
LINE10 TYPE STRING,
LINE11 TYPE STRING,
LINE12 TYPE STRING,
LINE13 TYPE STRING,
LINE14 TYPE STRING,
LINE15 TYPE STRING,
LINE16 TYPE STRING,
LINE17 TYPE STRING,
LINE18 TYPE STRING,
LINE19 TYPE STRING,
LINE20 TYPE STRING,
LINE21 TYPE STRING,
LINE22 TYPE STRING,
LINE23 TYPE STRING,
LINE24 TYPE STRING,
LINE25 TYPE STRING,
LINE26 TYPE STRING,
LINE27 TYPE STRING,
LINE28 TYPE STRING,
LINE29 TYPE STRING,
LINE30 TYPE STRING,
LINE31 TYPE STRING,
LINE32 TYPE STRING,
LINE33 TYPE STRING,
LINE34 TYPE STRING,
LINE35 TYPE STRING,
LINE36 TYPE STRING,
LINE37 TYPE STRING,
LINE38 TYPE STRING,
LINE39 TYPE STRING,
LINE40 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CUKN_STRUC_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_STRUC_STR-COUNTER sy-vline 
WA_CUKN_STRUC_STR-LINE01 sy-vline 
WA_CUKN_STRUC_STR-LINE02 sy-vline 
WA_CUKN_STRUC_STR-LINE03 sy-vline 
WA_CUKN_STRUC_STR-LINE04 sy-vline 
WA_CUKN_STRUC_STR-LINE05 sy-vline 
WA_CUKN_STRUC_STR-LINE06 sy-vline 
WA_CUKN_STRUC_STR-LINE07 sy-vline 
WA_CUKN_STRUC_STR-LINE08 sy-vline 
WA_CUKN_STRUC_STR-LINE09 sy-vline 
WA_CUKN_STRUC_STR-LINE10 sy-vline 
WA_CUKN_STRUC_STR-LINE11 sy-vline 
WA_CUKN_STRUC_STR-LINE12 sy-vline 
WA_CUKN_STRUC_STR-LINE13 sy-vline 
WA_CUKN_STRUC_STR-LINE14 sy-vline 
WA_CUKN_STRUC_STR-LINE15 sy-vline 
WA_CUKN_STRUC_STR-LINE16 sy-vline 
WA_CUKN_STRUC_STR-LINE17 sy-vline 
WA_CUKN_STRUC_STR-LINE18 sy-vline 
WA_CUKN_STRUC_STR-LINE19 sy-vline 
WA_CUKN_STRUC_STR-LINE20 sy-vline 
WA_CUKN_STRUC_STR-LINE21 sy-vline 
WA_CUKN_STRUC_STR-LINE22 sy-vline 
WA_CUKN_STRUC_STR-LINE23 sy-vline 
WA_CUKN_STRUC_STR-LINE24 sy-vline 
WA_CUKN_STRUC_STR-LINE25 sy-vline 
WA_CUKN_STRUC_STR-LINE26 sy-vline 
WA_CUKN_STRUC_STR-LINE27 sy-vline 
WA_CUKN_STRUC_STR-LINE28 sy-vline 
WA_CUKN_STRUC_STR-LINE29 sy-vline 
WA_CUKN_STRUC_STR-LINE30 sy-vline 
WA_CUKN_STRUC_STR-LINE31 sy-vline 
WA_CUKN_STRUC_STR-LINE32 sy-vline 
WA_CUKN_STRUC_STR-LINE33 sy-vline 
WA_CUKN_STRUC_STR-LINE34 sy-vline 
WA_CUKN_STRUC_STR-LINE35 sy-vline 
WA_CUKN_STRUC_STR-LINE36 sy-vline 
WA_CUKN_STRUC_STR-LINE37 sy-vline 
WA_CUKN_STRUC_STR-LINE38 sy-vline 
WA_CUKN_STRUC_STR-LINE39 sy-vline 
WA_CUKN_STRUC_STR-LINE40 sy-vline      INTO ld_text SEPARATED BY SPACE.

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