ABAP Select data from SAP table DFKKWL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKWL
*  INTO TABLE @DATA(IT_DFKKWL2).
*--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 INDEX 1 INTO DATA(WA_DFKKWL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKWL>-MANDT = 1.
<DFKKWL>-WLIDENT = 1.
<DFKKWL>-WLITYPE = 1.
<DFKKWL>-WLICAT = 1.
<DFKKWL>-DESCR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKWL-ERDAT, sy-vline,
  WA_DFKKWL-ERTIM, sy-vline,
  WA_DFKKWL-ERNAM, sy-vline,
  WA_DFKKWL-AEDAT, sy-vline,
  WA_DFKKWL-AETIM, sy-vline,
  WA_DFKKWL-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKWL 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 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 INTO WA_DFKKWL.


*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_STR, 
MANDT TYPE STRING,
WLIDENT TYPE STRING,
WLITYPE TYPE STRING,
WLICAT TYPE STRING,
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_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_STR-MANDT sy-vline 
WA_DFKKWL_STR-WLIDENT sy-vline 
WA_DFKKWL_STR-WLITYPE sy-vline 
WA_DFKKWL_STR-WLICAT sy-vline 
WA_DFKKWL_STR-DESCR sy-vline 
WA_DFKKWL_STR-ERDAT sy-vline 
WA_DFKKWL_STR-ERTIM sy-vline 
WA_DFKKWL_STR-ERNAM sy-vline 
WA_DFKKWL_STR-AEDAT sy-vline 
WA_DFKKWL_STR-AETIM sy-vline 
WA_DFKKWL_STR-AENAM sy-vline 
WA_DFKKWL_STR-WLMODE sy-vline 
WA_DFKKWL_STR-EXDAT sy-vline 
WA_DFKKWL_STR-CENTER sy-vline 
WA_DFKKWL_STR-STATUS sy-vline 
WA_DFKKWL_STR-STATUSCHECK sy-vline 
WA_DFKKWL_STR-NUMASSIGN sy-vline 
WA_DFKKWL_STR-NUMITEMS sy-vline 
WA_DFKKWL_STR-SCRULE sy-vline 
WA_DFKKWL_STR-WLTYPE sy-vline 
WA_DFKKWL_STR-LAUFD sy-vline 
WA_DFKKWL_STR-LAUFI sy-vline 
WA_DFKKWL_STR-UNIT sy-vline 
WA_DFKKWL_STR-GRP01 sy-vline 
WA_DFKKWL_STR-GRP02 sy-vline 
WA_DFKKWL_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.