ABAP Select data from SAP table WB2_S_COMSUB_COM_DISP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WB2_S_COMSUB_COM_DISP 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 WB2_S_COMSUB_COM_DISP. 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 WB2_S_COMSUB_COM_DISP 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_WB2_S_COMSUB_COM_DISP TYPE STANDARD TABLE OF WB2_S_COMSUB_COM_DISP,
      WA_WB2_S_COMSUB_COM_DISP TYPE WB2_S_COMSUB_COM_DISP,
      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: <WB2_S_COMSUB_COM_DISP> TYPE WB2_S_COMSUB_COM_DISP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WB2_S_COMSUB_COM_DISP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WB2_S_COMSUB_COM_DISP
  INTO TABLE IT_WB2_S_COMSUB_COM_DISP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WB2_S_COMSUB_COM_DISP
*  INTO TABLE @DATA(IT_WB2_S_COMSUB_COM_DISP2).
*--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_WB2_S_COMSUB_COM_DISP INDEX 1 INTO DATA(WA_WB2_S_COMSUB_COM_DISP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WB2_S_COMSUB_COM_DISP ASSIGNING <WB2_S_COMSUB_COM_DISP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WB2_S_COMSUB_COM_DISP>-ICON_SEL = 1.
<WB2_S_COMSUB_COM_DISP>-CLIENT = 1.
<WB2_S_COMSUB_COM_DISP>-TKONN = 1.
<WB2_S_COMSUB_COM_DISP>-TPOSN = 1.
<WB2_S_COMSUB_COM_DISP>-SIDE = 1.

ENDLOOP.

LOOP AT IT_WB2_S_COMSUB_COM_DISP INTO WA_WB2_S_COMSUB_COM_DISP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WB2_S_COMSUB_COM_DISP-TPOSN_COM, sy-vline,
  WA_WB2_S_COMSUB_COM_DISP-QUANTITY, sy-vline,
  WA_WB2_S_COMSUB_COM_DISP-UNIT, sy-vline,
  WA_WB2_S_COMSUB_COM_DISP-DATE_FROM, sy-vline,
  WA_WB2_S_COMSUB_COM_DISP-DATE_TO, sy-vline,
  WA_WB2_S_COMSUB_COM_DISP-FUTURE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WB2_S_COMSUB_COM_DISP 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_WB2_S_COMSUB_COM_DISP 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_WB2_S_COMSUB_COM_DISP INTO WA_WB2_S_COMSUB_COM_DISP.


*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 TKONN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-TKONN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-TKONN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASIS_MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-BASIS_MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-BASIS_MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VENDOR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-VENDOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-VENDOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_S_COMSUB_COM_DISP-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_S_COMSUB_COM_DISP-CUSTOMER.
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_WB2_S_COMSUB_COM_DISP_STR, 
ICON_SEL TYPE STRING,
CLIENT TYPE STRING,
TKONN TYPE STRING,
TPOSN TYPE STRING,
SIDE TYPE STRING,
TPOSN_COM TYPE STRING,
QUANTITY TYPE STRING,
UNIT TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
FUTURE TYPE STRING,
COM_GUID TYPE STRING,
CR_NAME TYPE STRING,
CR_DATE TYPE STRING,
CR_TIME TYPE STRING,
CH_NAME TYPE STRING,
CH_DATE TYPE STRING,
CH_TIME TYPE STRING,
IT_CLOSED TYPE STRING,
COM_CAT TYPE STRING,
NUMERATOR TYPE STRING,
DENOMINATOR TYPE STRING,
ASSGMT_REL TYPE STRING,
HKPSTP TYPE STRING,
MATNR TYPE STRING,
BASIS_MEINS TYPE STRING,
VENDOR TYPE STRING,
CUSTOMER TYPE STRING,
BATCH TYPE STRING,
EXT_REF TYPE STRING,
COM_ITEM_PROP TYPE STRING,
_DATAAGING TYPE STRING,
PLACE_HOLDER TYPE STRING,
FUT_DESCR TYPE STRING,
CUST_DESCR TYPE STRING,
VEND_DESCR TYPE STRING,
UPDKZ TYPE STRING,
IS_SINGLETON TYPE STRING,
GUID TYPE STRING,
O_COM_ITEM TYPE STRING,
LINECOLOR TYPE STRING,
CT TYPE STRING,
FILTER_OUT TYPE STRING,
DISP_GUID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WB2_S_COMSUB_COM_DISP_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_WB2_S_COMSUB_COM_DISP_STR-ICON_SEL sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CLIENT sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-TKONN sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-TPOSN sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-SIDE sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-TPOSN_COM sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-QUANTITY sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-UNIT sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-DATE_FROM sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-DATE_TO sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-FUTURE sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-COM_GUID sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CR_NAME sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CR_DATE sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CR_TIME sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CH_NAME sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CH_DATE sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CH_TIME sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-IT_CLOSED sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-COM_CAT sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-NUMERATOR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-DENOMINATOR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-ASSGMT_REL sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-HKPSTP sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-MATNR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-BASIS_MEINS sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-VENDOR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CUSTOMER sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-BATCH sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-EXT_REF sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-COM_ITEM_PROP sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-_DATAAGING sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-PLACE_HOLDER sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-FUT_DESCR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CUST_DESCR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-VEND_DESCR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-UPDKZ sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-IS_SINGLETON sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-GUID sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-O_COM_ITEM sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-LINECOLOR sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-CT sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-FILTER_OUT sy-vline 
WA_WB2_S_COMSUB_COM_DISP_STR-DISP_GUID sy-vline      INTO ld_text SEPARATED BY SPACE.

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