ABAP Select data from SAP table V_TKCOD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TKCOD
*  INTO TABLE @DATA(IT_V_TKCOD2).
*--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_V_TKCOD INDEX 1 INTO DATA(WA_V_TKCOD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TKCOD>-OBTYP = 1.
<V_TKCOD>-TXT20 = 1.
<V_TKCOD>-TXTCL = 1.
<V_TKCOD>-KYNOD = 1.
<V_TKCOD>-GRUP1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TKCOD-GRUP2, sy-vline,
  WA_V_TKCOD-GRUP3, sy-vline,
  WA_V_TKCOD-GRUP4, sy-vline,
  WA_V_TKCOD-VISIB, sy-vline,
  WA_V_TKCOD-APPLC, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_V_TKCOD 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_V_TKCOD 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_V_TKCOD INTO WA_V_TKCOD.


*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_V_TKCOD_STR, 
OBTYP TYPE STRING,
TXT20 TYPE STRING,
TXTCL TYPE STRING,
KYNOD TYPE STRING,
GRUP1 TYPE STRING,
GRUP2 TYPE STRING,
GRUP3 TYPE STRING,
GRUP4 TYPE STRING,
VISIB TYPE STRING,
APPLC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TKCOD_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_V_TKCOD_STR-OBTYP sy-vline 
WA_V_TKCOD_STR-TXT20 sy-vline 
WA_V_TKCOD_STR-TXTCL sy-vline 
WA_V_TKCOD_STR-KYNOD sy-vline 
WA_V_TKCOD_STR-GRUP1 sy-vline 
WA_V_TKCOD_STR-GRUP2 sy-vline 
WA_V_TKCOD_STR-GRUP3 sy-vline 
WA_V_TKCOD_STR-GRUP4 sy-vline 
WA_V_TKCOD_STR-VISIB sy-vline 
WA_V_TKCOD_STR-APPLC sy-vline      INTO ld_text SEPARATED BY SPACE.

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