ABAP Select data from SAP table /CFG/S_APPL_DS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CFG/S_APPL_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/S_APPL_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/S_APPL_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/S_APPL_DS TYPE STANDARD TABLE OF /CFG/S_APPL_DS,
      WA_/CFG/S_APPL_DS TYPE /CFG/S_APPL_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/S_APPL_DS> TYPE /CFG/S_APPL_DS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CFG/S_APPL_DS
*  INTO TABLE @DATA(IT_/CFG/S_APPL_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/S_APPL_DS INDEX 1 INTO DATA(WA_/CFG/S_APPL_DS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CFG/S_APPL_DS>-DS_ID = 1.
</CFG/S_APPL_DS>-DS_TYPE = 1.
</CFG/S_APPL_DS>-CONTFLAG = 1.
</CFG/S_APPL_DS>-CLIENT_DEP = 1.
</CFG/S_APPL_DS>-TEXT_DS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CFG/S_APPL_DS-IS_TEXT_TABLE, sy-vline,
  WA_/CFG/S_APPL_DS-APPL_AREA, sy-vline,
  WA_/CFG/S_APPL_DS-DDIC_TAB, sy-vline,
  WA_/CFG/S_APPL_DS-DDIC_PKG, sy-vline,
  WA_/CFG/S_APPL_DS-DS_CONSTRAINT, sy-vline,
  WA_/CFG/S_APPL_DS-DATA_ADAPTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CFG/S_APPL_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/S_APPL_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/S_APPL_DS INTO WA_/CFG/S_APPL_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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/CFG/S_APPL_DS_STR, 
DS_ID 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,
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,
TEXTS TYPE STRING,
FIELDS TYPE STRING,
DOMAINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CFG/S_APPL_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/S_APPL_DS_STR-DS_ID sy-vline 
WA_/CFG/S_APPL_DS_STR-DS_TYPE sy-vline 
WA_/CFG/S_APPL_DS_STR-CONTFLAG sy-vline 
WA_/CFG/S_APPL_DS_STR-CLIENT_DEP sy-vline 
WA_/CFG/S_APPL_DS_STR-TEXT_DS sy-vline 
WA_/CFG/S_APPL_DS_STR-IS_TEXT_TABLE sy-vline 
WA_/CFG/S_APPL_DS_STR-APPL_AREA sy-vline 
WA_/CFG/S_APPL_DS_STR-DDIC_TAB sy-vline 
WA_/CFG/S_APPL_DS_STR-DDIC_PKG sy-vline 
WA_/CFG/S_APPL_DS_STR-DS_CONSTRAINT sy-vline 
WA_/CFG/S_APPL_DS_STR-DATA_ADAPTER sy-vline 
WA_/CFG/S_APPL_DS_STR-CONVERSION sy-vline 
WA_/CFG/S_APPL_DS_STR-GENERATION sy-vline 
WA_/CFG/S_APPL_DS_STR-VALIDATION sy-vline 
WA_/CFG/S_APPL_DS_STR-VETO_CHECK sy-vline 
WA_/CFG/S_APPL_DS_STR-ACTIVATION_ADAPTER sy-vline 
WA_/CFG/S_APPL_DS_STR-OBSERVER sy-vline 
WA_/CFG/S_APPL_DS_STR-CONTENT_CLASS sy-vline 
WA_/CFG/S_APPL_DS_STR-CONTENT_USAGE sy-vline 
WA_/CFG/S_APPL_DS_STR-MAY_INSERT sy-vline 
WA_/CFG/S_APPL_DS_STR-MAY_DELETE sy-vline 
WA_/CFG/S_APPL_DS_STR-MAY_MODIFY sy-vline 
WA_/CFG/S_APPL_DS_STR-BOOTSTRAP_CONTENT sy-vline 
WA_/CFG/S_APPL_DS_STR-DEVCLASS sy-vline 
WA_/CFG/S_APPL_DS_STR-DEF_OWNER sy-vline 
WA_/CFG/S_APPL_DS_STR-COMPLETION sy-vline 
WA_/CFG/S_APPL_DS_STR-TEXTS sy-vline 
WA_/CFG/S_APPL_DS_STR-FIELDS sy-vline 
WA_/CFG/S_APPL_DS_STR-DOMAINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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