ABAP Select data from SAP table /CFG/DS 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 /CFG/DS 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 /CFG/DS. 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 /CFG/DS 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_/CFG/DS TYPE STANDARD TABLE OF /CFG/DS,
      WA_/CFG/DS TYPE /CFG/DS,
      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: </CFG/DS> TYPE /CFG/DS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CFG/DS
*  INTO TABLE @DATA(IT_/CFG/DS2).
*--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_/CFG/DS INDEX 1 INTO DATA(WA_/CFG/DS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CFG/DS>-DS_ID = 1.
</CFG/DS>-CONTEXT = 1.
</CFG/DS>-VERSION = 1.
</CFG/DS>-VERSION_STATE = 1.
</CFG/DS>-MODIFIER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CFG/DS-DS_TYPE, sy-vline,
  WA_/CFG/DS-CONTFLAG, sy-vline,
  WA_/CFG/DS-CLIENT_DEP, sy-vline,
  WA_/CFG/DS-TEXT_DS, sy-vline,
  WA_/CFG/DS-IS_TEXT_TABLE, sy-vline,
  WA_/CFG/DS-APPL_AREA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CFG/DS 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_/CFG/DS 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_/CFG/DS INTO WA_/CFG/DS.


*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 TSTLC, internal->external for field CREATED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_/CFG/DS-CREATED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CFG/DS-CREATED_AT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTLC, internal->external for field CHANGED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_/CFG/DS-CHANGED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CFG/DS-CHANGED_AT.
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_/CFG/DS_STR, 
DS_ID TYPE STRING,
CONTEXT TYPE STRING,
VERSION TYPE STRING,
VERSION_STATE TYPE STRING,
MODIFIER TYPE STRING,
DS_TYPE TYPE STRING,
CONTFLAG TYPE STRING,
CLIENT_DEP TYPE STRING,
TEXT_DS TYPE STRING,
IS_TEXT_TABLE TYPE STRING,
APPL_AREA TYPE STRING,
DDIC_TAB TYPE STRING,
DDIC_PKG TYPE STRING,
DS_CONSTRAINT TYPE STRING,
DATA_ADAPTER TYPE STRING,
CONVERSION TYPE STRING,
GENERATION TYPE STRING,
VALIDATION TYPE STRING,
VETO_CHECK TYPE STRING,
ACTIVATION_ADAPTER TYPE STRING,
OBSERVER TYPE STRING,
CONTENT_CLASS TYPE STRING,
CONTENT_USAGE TYPE STRING,
CONTENT_USAGE_FLDS TYPE STRING,
MAY_INSERT TYPE STRING,
MAY_DELETE TYPE STRING,
MAY_MODIFY TYPE STRING,
BOOTSTRAP_CONTENT TYPE STRING,
DEVCLASS TYPE STRING,
DEF_OWNER TYPE STRING,
COMPLETION TYPE STRING,
LOC_INTENT TYPE STRING,
REVIEW_INSERTION TYPE STRING,
REVIEW_KEYCHANGE TYPE STRING,
REVIEW_DELETION TYPE STRING,
REVIEW_MODIFICATIONS TYPE STRING,
MAY_CHANGE_KEY TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_AT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CFG/DS_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_/CFG/DS_STR-DS_ID sy-vline 
WA_/CFG/DS_STR-CONTEXT sy-vline 
WA_/CFG/DS_STR-VERSION sy-vline 
WA_/CFG/DS_STR-VERSION_STATE sy-vline 
WA_/CFG/DS_STR-MODIFIER sy-vline 
WA_/CFG/DS_STR-DS_TYPE sy-vline 
WA_/CFG/DS_STR-CONTFLAG sy-vline 
WA_/CFG/DS_STR-CLIENT_DEP sy-vline 
WA_/CFG/DS_STR-TEXT_DS sy-vline 
WA_/CFG/DS_STR-IS_TEXT_TABLE sy-vline 
WA_/CFG/DS_STR-APPL_AREA sy-vline 
WA_/CFG/DS_STR-DDIC_TAB sy-vline 
WA_/CFG/DS_STR-DDIC_PKG sy-vline 
WA_/CFG/DS_STR-DS_CONSTRAINT sy-vline 
WA_/CFG/DS_STR-DATA_ADAPTER sy-vline 
WA_/CFG/DS_STR-CONVERSION sy-vline 
WA_/CFG/DS_STR-GENERATION sy-vline 
WA_/CFG/DS_STR-VALIDATION sy-vline 
WA_/CFG/DS_STR-VETO_CHECK sy-vline 
WA_/CFG/DS_STR-ACTIVATION_ADAPTER sy-vline 
WA_/CFG/DS_STR-OBSERVER sy-vline 
WA_/CFG/DS_STR-CONTENT_CLASS sy-vline 
WA_/CFG/DS_STR-CONTENT_USAGE sy-vline 
WA_/CFG/DS_STR-CONTENT_USAGE_FLDS sy-vline 
WA_/CFG/DS_STR-MAY_INSERT sy-vline 
WA_/CFG/DS_STR-MAY_DELETE sy-vline 
WA_/CFG/DS_STR-MAY_MODIFY sy-vline 
WA_/CFG/DS_STR-BOOTSTRAP_CONTENT sy-vline 
WA_/CFG/DS_STR-DEVCLASS sy-vline 
WA_/CFG/DS_STR-DEF_OWNER sy-vline 
WA_/CFG/DS_STR-COMPLETION sy-vline 
WA_/CFG/DS_STR-LOC_INTENT sy-vline 
WA_/CFG/DS_STR-REVIEW_INSERTION sy-vline 
WA_/CFG/DS_STR-REVIEW_KEYCHANGE sy-vline 
WA_/CFG/DS_STR-REVIEW_DELETION sy-vline 
WA_/CFG/DS_STR-REVIEW_MODIFICATIONS sy-vline 
WA_/CFG/DS_STR-MAY_CHANGE_KEY sy-vline 
WA_/CFG/DS_STR-CREATED_BY sy-vline 
WA_/CFG/DS_STR-CREATED_AT sy-vline 
WA_/CFG/DS_STR-CHANGED_BY sy-vline 
WA_/CFG/DS_STR-CHANGED_AT sy-vline      INTO ld_text SEPARATED BY SPACE.

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