ABAP Select data from SAP table /ISDFPS/DFOBJECTCLASS_LIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/DFOBJECTCLASS_LIST 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 /ISDFPS/DFOBJECTCLASS_LIST. 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 /ISDFPS/DFOBJECTCLASS_LIST 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_/ISDFPS/DFOBJECTCLASS_LIST TYPE STANDARD TABLE OF /ISDFPS/DFOBJECTCLASS_LIST,
      WA_/ISDFPS/DFOBJECTCLASS_LIST TYPE /ISDFPS/DFOBJECTCLASS_LIST,
      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: </ISDFPS/DFOBJECTCLASS_LIST> TYPE /ISDFPS/DFOBJECTCLASS_LIST.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/DFOBJECTCLASS_LIST
  INTO TABLE IT_/ISDFPS/DFOBJECTCLASS_LIST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/DFOBJECTCLASS_LIST
*  INTO TABLE @DATA(IT_/ISDFPS/DFOBJECTCLASS_LIST2).
*--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_/ISDFPS/DFOBJECTCLASS_LIST INDEX 1 INTO DATA(WA_/ISDFPS/DFOBJECTCLASS_LIST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ISDFPS/DFOBJECTCLASS_LIST ASSIGNING </ISDFPS/DFOBJECTCLASS_LIST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/DFOBJECTCLASS_LIST>-PLVAR = 1.
</ISDFPS/DFOBJECTCLASS_LIST>-OTYPE = 1.
</ISDFPS/DFOBJECTCLASS_LIST>-OBJID = 1.
</ISDFPS/DFOBJECTCLASS_LIST>-BEGDA = 1.
</ISDFPS/DFOBJECTCLASS_LIST>-ENDDA = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/DFOBJECTCLASS_LIST INTO WA_/ISDFPS/DFOBJECTCLASS_LIST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/DFOBJECTCLASS_LIST-SHORT, sy-vline,
  WA_/ISDFPS/DFOBJECTCLASS_LIST-STEXT, sy-vline,
  WA_/ISDFPS/DFOBJECTCLASS_LIST-OBJECT, sy-vline,
  WA_/ISDFPS/DFOBJECTCLASS_LIST-STATUS, sy-vline,
  WA_/ISDFPS/DFOBJECTCLASS_LIST-OBJTYP, sy-vline,
  WA_/ISDFPS/DFOBJECTCLASS_LIST-CLASSNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/DFOBJECTCLASS_LIST 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_/ISDFPS/DFOBJECTCLASS_LIST 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_/ISDFPS/DFOBJECTCLASS_LIST INTO WA_/ISDFPS/DFOBJECTCLASS_LIST.


*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 NUM_UNIT_FROM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/DFOBJECTCLASS_LIST-NUM_UNIT_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/DFOBJECTCLASS_LIST-NUM_UNIT_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field NUM_UNIT_TO
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/DFOBJECTCLASS_LIST-NUM_UNIT_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/DFOBJECTCLASS_LIST-NUM_UNIT_TO.
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_/ISDFPS/DFOBJECTCLASS_LIST_STR, 
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
OBJECT TYPE STRING,
STATUS TYPE STRING,
OBJTYP TYPE STRING,
CLASSNUM TYPE STRING,
CLASSTYPE TYPE STRING,
STANDARDCLASS TYPE STRING,
CHAR_CHARACT TYPE STRING,
CHAR_VALUE_CHAR TYPE STRING,
CHAR_INHERITED TYPE STRING,
CHAR_INSTANCE TYPE STRING,
CHAR_VALUE_NEUTRAL TYPE STRING,
CHAR_CHARACT_DESCR TYPE STRING,
CURR_CHARACT TYPE STRING,
CURR_VALUE_FROM TYPE STRING,
CURR_VALUE_TO TYPE STRING,
CURR_VALUE_FROM_C TYPE STRING,
CURR_VALUE_TO_C TYPE STRING,
CURR_VALUE_RELATION TYPE STRING,
CURR_CURRENCY_FROM TYPE STRING,
CURR_CURRENCY_TO TYPE STRING,
CURR_CURRENCY_FROM_ISO TYPE STRING,
CURR_CURRENCY_TO_ISO TYPE STRING,
CURR_INHERITED TYPE STRING,
CURR_INSTANCE TYPE STRING,
CURR_CHARACT_DESCR TYPE STRING,
NUM_CHARACT TYPE STRING,
NUM_VALUE_FROM TYPE STRING,
NUM_VALUE_TO TYPE STRING,
NUM_VALUE_FROM_Q TYPE STRING,
NUM_VALUE_TO_Q TYPE STRING,
NUM_VALUE_RELATION TYPE STRING,
NUM_UNIT_FROM TYPE STRING,
NUM_UNIT_TO TYPE STRING,
NUM_UNIT_FROM_ISO TYPE STRING,
NUM_UNIT_TO_ISO TYPE STRING,
NUM_INHERITED TYPE STRING,
NUM_INSTANCE TYPE STRING,
NUM_CHARACT_DESCR TYPE STRING,
SELECTED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/DFOBJECTCLASS_LIST_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_/ISDFPS/DFOBJECTCLASS_LIST_STR-PLVAR sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-OTYPE sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-OBJID sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-BEGDA sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-ENDDA sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-SHORT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-STEXT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-OBJECT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-STATUS sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-OBJTYP sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CLASSNUM sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CLASSTYPE sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-STANDARDCLASS sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_CHARACT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_VALUE_CHAR sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_INHERITED sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_INSTANCE sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_VALUE_NEUTRAL sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CHAR_CHARACT_DESCR sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CHARACT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_VALUE_FROM sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_VALUE_TO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_VALUE_FROM_C sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_VALUE_TO_C sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_VALUE_RELATION sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CURRENCY_FROM sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CURRENCY_TO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CURRENCY_FROM_ISO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CURRENCY_TO_ISO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_INHERITED sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_INSTANCE sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-CURR_CHARACT_DESCR sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_CHARACT sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_VALUE_FROM sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_VALUE_TO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_VALUE_FROM_Q sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_VALUE_TO_Q sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_VALUE_RELATION sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_UNIT_FROM sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_UNIT_TO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_UNIT_FROM_ISO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_UNIT_TO_ISO sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_INHERITED sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_INSTANCE sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-NUM_CHARACT_DESCR sy-vline 
WA_/ISDFPS/DFOBJECTCLASS_LIST_STR-SELECTED sy-vline      INTO ld_text SEPARATED BY SPACE.

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