ABAP Select data from SAP table TXW_KOSTK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_KOSTK
*  INTO TABLE @DATA(IT_TXW_KOSTK2).
*--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_TXW_KOSTK INDEX 1 INTO DATA(WA_TXW_KOSTK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_KOSTK>-MANDT = 1.
<TXW_KOSTK>-PERNR = 1.
<TXW_KOSTK>-REINR = 1.
<TXW_KOSTK>-PERIO = 1.
<TXW_KOSTK>-PDVRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_KOSTK-KMVNR, sy-vline,
  WA_TXW_KOSTK-SPKUE, sy-vline,
  WA_TXW_KOSTK-ZIKEY, sy-vline,
  WA_TXW_KOSTK-KOKEY, sy-vline,
  WA_TXW_KOSTK-AUFTL, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TXW_KOSTK 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_TXW_KOSTK 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_TXW_KOSTK INTO WA_TXW_KOSTK.


*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_TXW_KOSTK_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
REINR TYPE STRING,
PERIO TYPE STRING,
PDVRS TYPE STRING,
KMVNR TYPE STRING,
SPKUE TYPE STRING,
ZIKEY TYPE STRING,
KOKEY TYPE STRING,
AUFTL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_KOSTK_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_TXW_KOSTK_STR-MANDT sy-vline 
WA_TXW_KOSTK_STR-PERNR sy-vline 
WA_TXW_KOSTK_STR-REINR sy-vline 
WA_TXW_KOSTK_STR-PERIO sy-vline 
WA_TXW_KOSTK_STR-PDVRS sy-vline 
WA_TXW_KOSTK_STR-KMVNR sy-vline 
WA_TXW_KOSTK_STR-SPKUE sy-vline 
WA_TXW_KOSTK_STR-ZIKEY sy-vline 
WA_TXW_KOSTK_STR-KOKEY sy-vline 
WA_TXW_KOSTK_STR-AUFTL sy-vline      INTO ld_text SEPARATED BY SPACE.

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