ABAP Select data from SAP table KOMSHDE into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KOMSHDE 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 KOMSHDE. 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 KOMSHDE 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_KOMSHDE TYPE STANDARD TABLE OF KOMSHDE,
      WA_KOMSHDE TYPE KOMSHDE,
      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: <KOMSHDE> TYPE KOMSHDE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMSHDE
*  INTO TABLE @DATA(IT_KOMSHDE2).
*--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_KOMSHDE INDEX 1 INTO DATA(WA_KOMSHDE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMSHDE>-TYPE = 1.
<KOMSHDE>-DOCUMENT = 1.
<KOMSHDE>-ITEM = 1.
<KOMSHDE>-SIDE = 1.
<KOMSHDE>-SUB_ITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMSHDE-ITEM_QUAN, sy-vline,
  WA_KOMSHDE-ITEM_UOM, sy-vline,
  WA_KOMSHDE-ASSGD_UOM, sy-vline,
  WA_KOMSHDE-NUMERATOR, sy-vline,
  WA_KOMSHDE-DENOMINATOR, sy-vline,
  WA_KOMSHDE-VENDOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMSHDE 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_KOMSHDE 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_KOMSHDE INTO WA_KOMSHDE.


*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 CUNIT, internal->external for field ITEM_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMSHDE-ITEM_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMSHDE-ITEM_UOM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ASSGD_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMSHDE-ASSGD_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMSHDE-ASSGD_UOM.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMSHDE-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMSHDE-MATNR.
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_KOMSHDE_STR, 
TYPE TYPE STRING,
DOCUMENT TYPE STRING,
ITEM TYPE STRING,
SIDE TYPE STRING,
SUB_ITEM TYPE STRING,
ITEM_QUAN TYPE STRING,
ITEM_UOM TYPE STRING,
ASSGD_UOM TYPE STRING,
NUMERATOR TYPE STRING,
DENOMINATOR TYPE STRING,
VENDOR TYPE STRING,
CUSTOMER TYPE STRING,
MATNR TYPE STRING,
BATCH TYPE STRING,
FUTURE TYPE STRING,
CLOSED TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
CANCEL_FLAG TYPE STRING,
COM_CAT TYPE STRING,
PRE_TYPE TYPE STRING,
PRE_DOCUMENT TYPE STRING,
PRE_ITEM TYPE STRING,
PRE_SIDE TYPE STRING,
PRE_SUB_ITEM TYPE STRING,
ROOT_TYPE TYPE STRING,
ROOT_DOCUMENT TYPE STRING,
ROOT_ITEM TYPE STRING,
ROOT_SIDE TYPE STRING,
ROOT_SUB_ITEM TYPE STRING,
PLACE_HOLDER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMSHDE_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_KOMSHDE_STR-TYPE sy-vline 
WA_KOMSHDE_STR-DOCUMENT sy-vline 
WA_KOMSHDE_STR-ITEM sy-vline 
WA_KOMSHDE_STR-SIDE sy-vline 
WA_KOMSHDE_STR-SUB_ITEM sy-vline 
WA_KOMSHDE_STR-ITEM_QUAN sy-vline 
WA_KOMSHDE_STR-ITEM_UOM sy-vline 
WA_KOMSHDE_STR-ASSGD_UOM sy-vline 
WA_KOMSHDE_STR-NUMERATOR sy-vline 
WA_KOMSHDE_STR-DENOMINATOR sy-vline 
WA_KOMSHDE_STR-VENDOR sy-vline 
WA_KOMSHDE_STR-CUSTOMER sy-vline 
WA_KOMSHDE_STR-MATNR sy-vline 
WA_KOMSHDE_STR-BATCH sy-vline 
WA_KOMSHDE_STR-FUTURE sy-vline 
WA_KOMSHDE_STR-CLOSED sy-vline 
WA_KOMSHDE_STR-DATE_FROM sy-vline 
WA_KOMSHDE_STR-DATE_TO sy-vline 
WA_KOMSHDE_STR-CANCEL_FLAG sy-vline 
WA_KOMSHDE_STR-COM_CAT sy-vline 
WA_KOMSHDE_STR-PRE_TYPE sy-vline 
WA_KOMSHDE_STR-PRE_DOCUMENT sy-vline 
WA_KOMSHDE_STR-PRE_ITEM sy-vline 
WA_KOMSHDE_STR-PRE_SIDE sy-vline 
WA_KOMSHDE_STR-PRE_SUB_ITEM sy-vline 
WA_KOMSHDE_STR-ROOT_TYPE sy-vline 
WA_KOMSHDE_STR-ROOT_DOCUMENT sy-vline 
WA_KOMSHDE_STR-ROOT_ITEM sy-vline 
WA_KOMSHDE_STR-ROOT_SIDE sy-vline 
WA_KOMSHDE_STR-ROOT_SUB_ITEM sy-vline 
WA_KOMSHDE_STR-PLACE_HOLDER sy-vline      INTO ld_text SEPARATED BY SPACE.

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