ABAP Select data from SAP table TFK020K into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TFK020K 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 TFK020K. 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 TFK020K 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_TFK020K TYPE STANDARD TABLE OF TFK020K,
      WA_TFK020K TYPE TFK020K,
      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: <TFK020K> TYPE TFK020K.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TFK020K.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TFK020K
  INTO TABLE IT_TFK020K.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TFK020K
*  INTO TABLE @DATA(IT_TFK020K2).
*--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_TFK020K INDEX 1 INTO DATA(WA_TFK020K2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TFK020K ASSIGNING <TFK020K>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TFK020K>-MANDT = 1.
<TFK020K>-KUKON = 1.
<TFK020K>-BUKRS = 1.
<TFK020K>-HKONT = 1.
<TFK020K>-GSBER = 1.

ENDLOOP.

LOOP AT IT_TFK020K INTO WA_TFK020K.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TFK020K-SEGMENT, sy-vline,
  WA_TFK020K-COKEY, sy-vline,
  WA_TFK020K-XEIPH, sy-vline,
  WA_TFK020K-XEVEN, sy-vline,
  WA_TFK020K-CTIME, sy-vline,
  WA_TFK020K-TEXT50, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TFK020K 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_TFK020K 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_TFK020K INTO WA_TFK020K.


*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 HKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TFK020K-HKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TFK020K-HKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SEGMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TFK020K-SEGMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TFK020K-SEGMENT.
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_TFK020K_STR, 
MANDT TYPE STRING,
KUKON TYPE STRING,
BUKRS TYPE STRING,
HKONT TYPE STRING,
GSBER TYPE STRING,
SEGMENT TYPE STRING,
COKEY TYPE STRING,
XEIPH TYPE STRING,
XEVEN TYPE STRING,
CTIME TYPE STRING,
TEXT50 TYPE STRING,
MWSKZ TYPE STRING,
BEGRU TYPE STRING,
AAREA TYPE STRING,
XGLOV TYPE STRING,
XCLTR TYPE STRING,
TXJCD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TFK020K_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_TFK020K_STR-MANDT sy-vline 
WA_TFK020K_STR-KUKON sy-vline 
WA_TFK020K_STR-BUKRS sy-vline 
WA_TFK020K_STR-HKONT sy-vline 
WA_TFK020K_STR-GSBER sy-vline 
WA_TFK020K_STR-SEGMENT sy-vline 
WA_TFK020K_STR-COKEY sy-vline 
WA_TFK020K_STR-XEIPH sy-vline 
WA_TFK020K_STR-XEVEN sy-vline 
WA_TFK020K_STR-CTIME sy-vline 
WA_TFK020K_STR-TEXT50 sy-vline 
WA_TFK020K_STR-MWSKZ sy-vline 
WA_TFK020K_STR-BEGRU sy-vline 
WA_TFK020K_STR-AAREA sy-vline 
WA_TFK020K_STR-XGLOV sy-vline 
WA_TFK020K_STR-XCLTR sy-vline 
WA_TFK020K_STR-TXJCD sy-vline      INTO ld_text SEPARATED BY SPACE.

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