ABAP Select data from SAP table DFKKWL_STRUC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DFKKWL_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 DFKKWL_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 DFKKWL_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_DFKKWL_STRUC TYPE STANDARD TABLE OF DFKKWL_STRUC,
      WA_DFKKWL_STRUC TYPE DFKKWL_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: <DFKKWL_STRUC> TYPE DFKKWL_STRUC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKWL_STRUC
*  INTO TABLE @DATA(IT_DFKKWL_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_DFKKWL_STRUC INDEX 1 INTO DATA(WA_DFKKWL_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKWL_STRUC>-DESCR = 1.
<DFKKWL_STRUC>-ERDAT = 1.
<DFKKWL_STRUC>-ERTIM = 1.
<DFKKWL_STRUC>-ERNAM = 1.
<DFKKWL_STRUC>-AEDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKWL_STRUC-AETIM, sy-vline,
  WA_DFKKWL_STRUC-AENAM, sy-vline,
  WA_DFKKWL_STRUC-WLMODE, sy-vline,
  WA_DFKKWL_STRUC-EXDAT, sy-vline,
  WA_DFKKWL_STRUC-CENTER, sy-vline,
  WA_DFKKWL_STRUC-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKWL_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_DFKKWL_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_DFKKWL_STRUC INTO WA_DFKKWL_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_DFKKWL_STRUC_STR, 
DESCR TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
AENAM TYPE STRING,
WLMODE TYPE STRING,
EXDAT TYPE STRING,
CENTER TYPE STRING,
STATUS TYPE STRING,
STATUSCHECK TYPE STRING,
NUMASSIGN TYPE STRING,
NUMITEMS TYPE STRING,
SCRULE TYPE STRING,
WLTYPE TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
UNIT TYPE STRING,
GRP01 TYPE STRING,
GRP02 TYPE STRING,
TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKWL_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_DFKKWL_STRUC_STR-DESCR sy-vline 
WA_DFKKWL_STRUC_STR-ERDAT sy-vline 
WA_DFKKWL_STRUC_STR-ERTIM sy-vline 
WA_DFKKWL_STRUC_STR-ERNAM sy-vline 
WA_DFKKWL_STRUC_STR-AEDAT sy-vline 
WA_DFKKWL_STRUC_STR-AETIM sy-vline 
WA_DFKKWL_STRUC_STR-AENAM sy-vline 
WA_DFKKWL_STRUC_STR-WLMODE sy-vline 
WA_DFKKWL_STRUC_STR-EXDAT sy-vline 
WA_DFKKWL_STRUC_STR-CENTER sy-vline 
WA_DFKKWL_STRUC_STR-STATUS sy-vline 
WA_DFKKWL_STRUC_STR-STATUSCHECK sy-vline 
WA_DFKKWL_STRUC_STR-NUMASSIGN sy-vline 
WA_DFKKWL_STRUC_STR-NUMITEMS sy-vline 
WA_DFKKWL_STRUC_STR-SCRULE sy-vline 
WA_DFKKWL_STRUC_STR-WLTYPE sy-vline 
WA_DFKKWL_STRUC_STR-LAUFD sy-vline 
WA_DFKKWL_STRUC_STR-LAUFI sy-vline 
WA_DFKKWL_STRUC_STR-UNIT sy-vline 
WA_DFKKWL_STRUC_STR-GRP01 sy-vline 
WA_DFKKWL_STRUC_STR-GRP02 sy-vline 
WA_DFKKWL_STRUC_STR-TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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