ABAP Select data from SAP table FKKWL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKWL
*  INTO TABLE @DATA(IT_FKKWL2).
*--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_FKKWL INDEX 1 INTO DATA(WA_FKKWL2).


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

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

ENDLOOP.

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

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


*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_FKKWL_STR, 
XMARK TYPE STRING,
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,
CENTERTXT TYPE STRING,
WLMODE_TXT TYPE STRING,
WLSTAT_TXT TYPE STRING,
WLINUM TYPE STRING,
WLINUM_FINAL TYPE STRING,
WLINUM_UNASN TYPE STRING,
TOTAL_AMOUNT TYPE STRING,
WLINUM_ASN TYPE STRING,
WLTYPE_TXT TYPE STRING,
UNITTXT TYPE STRING,
WLICATTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKWL_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_FKKWL_STR-XMARK sy-vline 
WA_FKKWL_STR-MANDT sy-vline 
WA_FKKWL_STR-WLIDENT sy-vline 
WA_FKKWL_STR-WLITYPE sy-vline 
WA_FKKWL_STR-WLICAT sy-vline 
WA_FKKWL_STR-DESCR sy-vline 
WA_FKKWL_STR-ERDAT sy-vline 
WA_FKKWL_STR-ERTIM sy-vline 
WA_FKKWL_STR-ERNAM sy-vline 
WA_FKKWL_STR-AEDAT sy-vline 
WA_FKKWL_STR-AETIM sy-vline 
WA_FKKWL_STR-AENAM sy-vline 
WA_FKKWL_STR-WLMODE sy-vline 
WA_FKKWL_STR-EXDAT sy-vline 
WA_FKKWL_STR-CENTER sy-vline 
WA_FKKWL_STR-STATUS sy-vline 
WA_FKKWL_STR-STATUSCHECK sy-vline 
WA_FKKWL_STR-NUMASSIGN sy-vline 
WA_FKKWL_STR-NUMITEMS sy-vline 
WA_FKKWL_STR-SCRULE sy-vline 
WA_FKKWL_STR-WLTYPE sy-vline 
WA_FKKWL_STR-LAUFD sy-vline 
WA_FKKWL_STR-LAUFI sy-vline 
WA_FKKWL_STR-UNIT sy-vline 
WA_FKKWL_STR-GRP01 sy-vline 
WA_FKKWL_STR-GRP02 sy-vline 
WA_FKKWL_STR-TEXT sy-vline 
WA_FKKWL_STR-CENTERTXT sy-vline 
WA_FKKWL_STR-WLMODE_TXT sy-vline 
WA_FKKWL_STR-WLSTAT_TXT sy-vline 
WA_FKKWL_STR-WLINUM sy-vline 
WA_FKKWL_STR-WLINUM_FINAL sy-vline 
WA_FKKWL_STR-WLINUM_UNASN sy-vline 
WA_FKKWL_STR-TOTAL_AMOUNT sy-vline 
WA_FKKWL_STR-WLINUM_ASN sy-vline 
WA_FKKWL_STR-WLTYPE_TXT sy-vline 
WA_FKKWL_STR-UNITTXT sy-vline 
WA_FKKWL_STR-WLICATTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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