ABAP Select data from SAP table WTY_KOMG into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTY_KOMG
*  INTO TABLE @DATA(IT_WTY_KOMG2).
*--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_WTY_KOMG INDEX 1 INTO DATA(WA_WTY_KOMG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTY_KOMG>-WTY_CLMNO = 1.
<WTY_KOMG>-WTY_CLMTY = 1.
<WTY_KOMG>-WTY_REFDT = 1.
<WTY_KOMG>-WTY_REFNO = 1.
<WTY_KOMG>-WTY_OLDCN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTY_KOMG-WTY_AUTNO, sy-vline,
  WA_WTY_KOMG-WTY_AUTNA, sy-vline,
  WA_WTY_KOMG-WTY_CLERK, sy-vline,
  WA_WTY_KOMG-WTY_RELTY, sy-vline,
  WA_WTY_KOMG-WTY_RELOB, sy-vline,
  WA_WTY_KOMG-WTY_RELOT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WTY_KOMG 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_WTY_KOMG 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_WTY_KOMG INTO WA_WTY_KOMG.


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

*Conversion exit ALPHA, internal->external for field WTY_OLDCN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTY_KOMG-WTY_OLDCN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTY_KOMG-WTY_OLDCN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WTY_V_PARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTY_KOMG-WTY_V_PARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTY_KOMG-WTY_V_PARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field WTY_V_PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_WTY_KOMG-WTY_V_PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTY_KOMG-WTY_V_PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WTY_SDVBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTY_KOMG-WTY_SDVBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTY_KOMG-WTY_SDVBELN.
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_WTY_KOMG_STR, 
WTY_CLMNO TYPE STRING,
WTY_CLMTY TYPE STRING,
WTY_REFDT TYPE STRING,
WTY_REFNO TYPE STRING,
WTY_OLDCN TYPE STRING,
WTY_AUTNO TYPE STRING,
WTY_AUTNA TYPE STRING,
WTY_CLERK TYPE STRING,
WTY_RELTY TYPE STRING,
WTY_RELOB TYPE STRING,
WTY_RELOT TYPE STRING,
WTY_RELDT TYPE STRING,
WTY_VERSN TYPE STRING,
WTY_KATEG TYPE STRING,
WTY_REJCD TYPE STRING,
WTY_REFKT TYPE STRING,
WTY_REFNR TYPE STRING,
WTY_AKTIV TYPE STRING,
WTY_V_PARNR TYPE STRING,
WTY_V_PARVW TYPE STRING,
WTY_POSNR TYPE STRING,
WTY_POSKT TYPE STRING,
WTY_DEFCT TYPE STRING,
WTY_ITMNO TYPE STRING,
WTY_QUANT TYPE STRING,
WTY_CONTR TYPE STRING,
WTY_CNTTY TYPE STRING,
WTY_RETPA TYPE STRING,
WTY_CAUSP TYPE STRING,
WTY_CRNCY TYPE STRING,
WTY_TAXK1 TYPE STRING,
WTY_SDVBELN TYPE STRING,
WTY_SDPOSNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTY_KOMG_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_WTY_KOMG_STR-WTY_CLMNO sy-vline 
WA_WTY_KOMG_STR-WTY_CLMTY sy-vline 
WA_WTY_KOMG_STR-WTY_REFDT sy-vline 
WA_WTY_KOMG_STR-WTY_REFNO sy-vline 
WA_WTY_KOMG_STR-WTY_OLDCN sy-vline 
WA_WTY_KOMG_STR-WTY_AUTNO sy-vline 
WA_WTY_KOMG_STR-WTY_AUTNA sy-vline 
WA_WTY_KOMG_STR-WTY_CLERK sy-vline 
WA_WTY_KOMG_STR-WTY_RELTY sy-vline 
WA_WTY_KOMG_STR-WTY_RELOB sy-vline 
WA_WTY_KOMG_STR-WTY_RELOT sy-vline 
WA_WTY_KOMG_STR-WTY_RELDT sy-vline 
WA_WTY_KOMG_STR-WTY_VERSN sy-vline 
WA_WTY_KOMG_STR-WTY_KATEG sy-vline 
WA_WTY_KOMG_STR-WTY_REJCD sy-vline 
WA_WTY_KOMG_STR-WTY_REFKT sy-vline 
WA_WTY_KOMG_STR-WTY_REFNR sy-vline 
WA_WTY_KOMG_STR-WTY_AKTIV sy-vline 
WA_WTY_KOMG_STR-WTY_V_PARNR sy-vline 
WA_WTY_KOMG_STR-WTY_V_PARVW sy-vline 
WA_WTY_KOMG_STR-WTY_POSNR sy-vline 
WA_WTY_KOMG_STR-WTY_POSKT sy-vline 
WA_WTY_KOMG_STR-WTY_DEFCT sy-vline 
WA_WTY_KOMG_STR-WTY_ITMNO sy-vline 
WA_WTY_KOMG_STR-WTY_QUANT sy-vline 
WA_WTY_KOMG_STR-WTY_CONTR sy-vline 
WA_WTY_KOMG_STR-WTY_CNTTY sy-vline 
WA_WTY_KOMG_STR-WTY_RETPA sy-vline 
WA_WTY_KOMG_STR-WTY_CAUSP sy-vline 
WA_WTY_KOMG_STR-WTY_CRNCY sy-vline 
WA_WTY_KOMG_STR-WTY_TAXK1 sy-vline 
WA_WTY_KOMG_STR-WTY_SDVBELN sy-vline 
WA_WTY_KOMG_STR-WTY_SDPOSNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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