ABAP Select data from SAP table DFKKWLIH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKWLIH
*  INTO TABLE @DATA(IT_DFKKWLIH2).
*--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_DFKKWLIH INDEX 1 INTO DATA(WA_DFKKWLIH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKWLIH>-MANDT = 1.
<DFKKWLIH>-WLIGUID = 1.
<DFKKWLIH>-AEDAT = 1.
<DFKKWLIH>-AETIM = 1.
<DFKKWLIH>-WLITYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKWLIH-AENAM, sy-vline,
  WA_DFKKWLIH-SCORE, sy-vline,
  WA_DFKKWLIH-XMAND, sy-vline,
  WA_DFKKWLIH-STAT, sy-vline,
  WA_DFKKWLIH-SUBSTAT, sy-vline,
  WA_DFKKWLIH-SUCCDES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKWLIH 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_DFKKWLIH 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_DFKKWLIH INTO WA_DFKKWLIH.


*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.

*Conversion exit ALPHA, internal->external for field CONTACTPERS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DFKKWLIH-CONTACTPERS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKWLIH-CONTACTPERS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_DFKKWLIH_STR, 
MANDT TYPE STRING,
WLIGUID TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
WLITYPE TYPE STRING,
AENAM TYPE STRING,
SCORE TYPE STRING,
XMAND TYPE STRING,
STAT TYPE STRING,
SUBSTAT TYPE STRING,
SUCCDES TYPE STRING,
RSTIMESTAMP TYPE STRING,
RSREAS TYPE STRING,
ASSIGNTYP TYPE STRING,
ASSIGNRES TYPE STRING,
WLINEXT TYPE STRING,
ILSTAT TYPE STRING,
CONTACTPERS TYPE STRING,
CENTER TYPE STRING,
UNIT TYPE STRING,
AGENT TYPE STRING,
STARTTIMESTAMP TYPE STRING,
ENDTIMESTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKWLIH_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_DFKKWLIH_STR-MANDT sy-vline 
WA_DFKKWLIH_STR-WLIGUID sy-vline 
WA_DFKKWLIH_STR-AEDAT sy-vline 
WA_DFKKWLIH_STR-AETIM sy-vline 
WA_DFKKWLIH_STR-WLITYPE sy-vline 
WA_DFKKWLIH_STR-AENAM sy-vline 
WA_DFKKWLIH_STR-SCORE sy-vline 
WA_DFKKWLIH_STR-XMAND sy-vline 
WA_DFKKWLIH_STR-STAT sy-vline 
WA_DFKKWLIH_STR-SUBSTAT sy-vline 
WA_DFKKWLIH_STR-SUCCDES sy-vline 
WA_DFKKWLIH_STR-RSTIMESTAMP sy-vline 
WA_DFKKWLIH_STR-RSREAS sy-vline 
WA_DFKKWLIH_STR-ASSIGNTYP sy-vline 
WA_DFKKWLIH_STR-ASSIGNRES sy-vline 
WA_DFKKWLIH_STR-WLINEXT sy-vline 
WA_DFKKWLIH_STR-ILSTAT sy-vline 
WA_DFKKWLIH_STR-CONTACTPERS sy-vline 
WA_DFKKWLIH_STR-CENTER sy-vline 
WA_DFKKWLIH_STR-UNIT sy-vline 
WA_DFKKWLIH_STR-AGENT sy-vline 
WA_DFKKWLIH_STR-STARTTIMESTAMP sy-vline 
WA_DFKKWLIH_STR-ENDTIMESTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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