ABAP Select data from SAP table DFKKAWM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKAWM
*  INTO TABLE @DATA(IT_DFKKAWM2).
*--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_DFKKAWM INDEX 1 INTO DATA(WA_DFKKAWM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKAWM>-MANDT = 1.
<DFKKAWM>-GUIDNR = 1.
<DFKKAWM>-MLLAND = 1.
<DFKKAWM>-MLTYP = 1.
<DFKKAWM>-MLKZV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKAWM-MLKZINT, sy-vline,
  WA_DFKKAWM-MLWAERS, sy-vline,
  WA_DFKKAWM-MLBETR, sy-vline,
  WA_DFKKAWM-TRWAERS, sy-vline,
  WA_DFKKAWM-TRBETR, sy-vline,
  WA_DFKKAWM-DOC1T, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKAWM 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_DFKKAWM 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_DFKKAWM INTO WA_DFKKAWM.


*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 AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DFKKAWM-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKAWM-AWSYS.
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_DFKKAWM_STR, 
MANDT TYPE STRING,
GUIDNR TYPE STRING,
MLLAND TYPE STRING,
MLTYP TYPE STRING,
MLKZV TYPE STRING,
MLKZINT TYPE STRING,
MLWAERS TYPE STRING,
MLBETR TYPE STRING,
TRWAERS TYPE STRING,
TRBETR TYPE STRING,
DOC1T TYPE STRING,
DOC1R TYPE STRING,
GPA1T TYPE STRING,
GPA1R TYPE STRING,
BUKRS TYPE STRING,
KORRDOC TYPE STRING,
KZKORR TYPE STRING,
MLVDAT TYPE STRING,
MLDAT TYPE STRING,
MLSTAT TYPE STRING,
MLAKT TYPE STRING,
MLDATA TYPE STRING,
ERNAM TYPE STRING,
CPUDT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AWSYS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKAWM_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_DFKKAWM_STR-MANDT sy-vline 
WA_DFKKAWM_STR-GUIDNR sy-vline 
WA_DFKKAWM_STR-MLLAND sy-vline 
WA_DFKKAWM_STR-MLTYP sy-vline 
WA_DFKKAWM_STR-MLKZV sy-vline 
WA_DFKKAWM_STR-MLKZINT sy-vline 
WA_DFKKAWM_STR-MLWAERS sy-vline 
WA_DFKKAWM_STR-MLBETR sy-vline 
WA_DFKKAWM_STR-TRWAERS sy-vline 
WA_DFKKAWM_STR-TRBETR sy-vline 
WA_DFKKAWM_STR-DOC1T sy-vline 
WA_DFKKAWM_STR-DOC1R sy-vline 
WA_DFKKAWM_STR-GPA1T sy-vline 
WA_DFKKAWM_STR-GPA1R sy-vline 
WA_DFKKAWM_STR-BUKRS sy-vline 
WA_DFKKAWM_STR-KORRDOC sy-vline 
WA_DFKKAWM_STR-KZKORR sy-vline 
WA_DFKKAWM_STR-MLVDAT sy-vline 
WA_DFKKAWM_STR-MLDAT sy-vline 
WA_DFKKAWM_STR-MLSTAT sy-vline 
WA_DFKKAWM_STR-MLAKT sy-vline 
WA_DFKKAWM_STR-MLDATA sy-vline 
WA_DFKKAWM_STR-ERNAM sy-vline 
WA_DFKKAWM_STR-CPUDT sy-vline 
WA_DFKKAWM_STR-AENAM sy-vline 
WA_DFKKAWM_STR-AEDAT sy-vline 
WA_DFKKAWM_STR-AWSYS sy-vline      INTO ld_text SEPARATED BY SPACE.

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