ABAP Select data from SAP table DFKKWLA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKWLA
*  INTO TABLE @DATA(IT_DFKKWLA2).
*--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_DFKKWLA INDEX 1 INTO DATA(WA_DFKKWLA2).


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

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

ENDLOOP.

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

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


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