ABAP Select data from SAP table COMT_CLEAR_VALUE_DESC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMT_CLEAR_VALUE_DESC
*  INTO TABLE @DATA(IT_COMT_CLEAR_VALUE_DESC2).
*--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_COMT_CLEAR_VALUE_DESC INDEX 1 INTO DATA(WA_COMT_CLEAR_VALUE_DESC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMT_CLEAR_VALUE_DESC>-TABNAME = 1.
<COMT_CLEAR_VALUE_DESC>-FIELDNAME = 1.
<COMT_CLEAR_VALUE_DESC>-FIELDVALUE = 1.
<COMT_CLEAR_VALUE_DESC>-LANGU = 1.
<COMT_CLEAR_VALUE_DESC>-SHLP_METHOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMT_CLEAR_VALUE_DESC-SHLPNAME, sy-vline,
  WA_COMT_CLEAR_VALUE_DESC-SHLPTYPE, sy-vline,
  WA_COMT_CLEAR_VALUE_DESC-INTDESCR, sy-vline,
  WA_COMT_CLEAR_VALUE_DESC-ISSIMPLE, sy-vline,
  WA_COMT_CLEAR_VALUE_DESC-HOTKEY, sy-vline,
  WA_COMT_CLEAR_VALUE_DESC-SELMTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMT_CLEAR_VALUE_DESC 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_COMT_CLEAR_VALUE_DESC 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_COMT_CLEAR_VALUE_DESC INTO WA_COMT_CLEAR_VALUE_DESC.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_COMT_CLEAR_VALUE_DESC-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_CLEAR_VALUE_DESC-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field DDLANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_COMT_CLEAR_VALUE_DESC-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_CLEAR_VALUE_DESC-DDLANGUAGE.
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_COMT_CLEAR_VALUE_DESC_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
FIELDVALUE TYPE STRING,
LANGU TYPE STRING,
SHLP_METHOD TYPE STRING,
SHLPNAME TYPE STRING,
SHLPTYPE TYPE STRING,
INTDESCR TYPE STRING,
ISSIMPLE TYPE STRING,
HOTKEY TYPE STRING,
SELMTYPE TYPE STRING,
SELMETHOD TYPE STRING,
TEXTTAB TYPE STRING,
SELMEXIT TYPE STRING,
DIALOGTYPE TYPE STRING,
DDLANGUAGE TYPE STRING,
DDTEXT TYPE STRING,
DIALOGINFO TYPE STRING,
F4STATE TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
TITLE TYPE STRING,
HISTORY TYPE STRING,
HANDLE TYPE STRING,
AUTOSUGGEST TYPE STRING,
FUZZY_SEARCH TYPE STRING,
FUZZY_SIMILARITY TYPE STRING,
INTERFACE TYPE STRING,
FIELDDESCR TYPE STRING,
FIELDPROP TYPE STRING,
SELOPT TYPE STRING,
TEXTSEARCH TYPE STRING,
REQUEST TYPE STRING,
FIELDS TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMT_CLEAR_VALUE_DESC_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_COMT_CLEAR_VALUE_DESC_STR-TABNAME sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDNAME sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDVALUE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-LANGU sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SHLP_METHOD sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SHLPNAME sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SHLPTYPE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-INTDESCR sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-ISSIMPLE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-HOTKEY sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SELMTYPE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SELMETHOD sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-TEXTTAB sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SELMEXIT sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-DIALOGTYPE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-DDLANGUAGE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-DDTEXT sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-DIALOGINFO sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-F4STATE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-TABNAME sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDNAME sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-TITLE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-HISTORY sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-HANDLE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-AUTOSUGGEST sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FUZZY_SEARCH sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FUZZY_SIMILARITY sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-INTERFACE sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDDESCR sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDPROP sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SELOPT sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-TEXTSEARCH sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-REQUEST sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDS sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-FIELDTEXT sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-REPTEXT sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SCRTEXT_S sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SCRTEXT_M sy-vline 
WA_COMT_CLEAR_VALUE_DESC_STR-SCRTEXT_L sy-vline      INTO ld_text SEPARATED BY SPACE.

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