ABAP Select data from SAP table DFKKNRK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKNRK
*  INTO TABLE @DATA(IT_DFKKNRK2).
*--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_DFKKNRK INDEX 1 INTO DATA(WA_DFKKNRK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKNRK>-MANDT = 1.
<DFKKNRK>-KEYN1 = 1.
<DFKKNRK>-STANS = 1.
<DFKKNRK>-ANZPO = 1.
<DFKKNRK>-MAXUP = 1.

ENDLOOP.

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

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


*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_DFKKNRK_STR, 
MANDT TYPE STRING,
KEYN1 TYPE STRING,
STANS TYPE STRING,
ANZPO TYPE STRING,
MAXUP TYPE STRING,
JOBNAME TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
KEYN2 TYPE STRING,
INFOF TYPE STRING,
KSUMP TYPE STRING,
XAUTS TYPE STRING,
XPOSA TYPE STRING,
OPBUK TYPE STRING,
INSID TYPE STRING,
FLINS TYPE STRING,
VALDT TYPE STRING,
XINIP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKNRK_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_DFKKNRK_STR-MANDT sy-vline 
WA_DFKKNRK_STR-KEYN1 sy-vline 
WA_DFKKNRK_STR-STANS sy-vline 
WA_DFKKNRK_STR-ANZPO sy-vline 
WA_DFKKNRK_STR-MAXUP sy-vline 
WA_DFKKNRK_STR-JOBNAME sy-vline 
WA_DFKKNRK_STR-ERNAM sy-vline 
WA_DFKKNRK_STR-ERDAT sy-vline 
WA_DFKKNRK_STR-ERTIM sy-vline 
WA_DFKKNRK_STR-AENAM sy-vline 
WA_DFKKNRK_STR-AEDAT sy-vline 
WA_DFKKNRK_STR-AETIM sy-vline 
WA_DFKKNRK_STR-KEYN2 sy-vline 
WA_DFKKNRK_STR-INFOF sy-vline 
WA_DFKKNRK_STR-KSUMP sy-vline 
WA_DFKKNRK_STR-XAUTS sy-vline 
WA_DFKKNRK_STR-XPOSA sy-vline 
WA_DFKKNRK_STR-OPBUK sy-vline 
WA_DFKKNRK_STR-INSID sy-vline 
WA_DFKKNRK_STR-FLINS sy-vline 
WA_DFKKNRK_STR-VALDT sy-vline 
WA_DFKKNRK_STR-XINIP sy-vline      INTO ld_text SEPARATED BY SPACE.

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