ABAP Select data from SAP table SDEST_FIELDS_TYPE_RFC_ABAP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SDEST_FIELDS_TYPE_RFC_ABAP
*  INTO TABLE @DATA(IT_SDEST_FIELDS_TYPE_RFC_ABAP2).
*--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_SDEST_FIELDS_TYPE_RFC_ABAP INDEX 1 INTO DATA(WA_SDEST_FIELDS_TYPE_RFC_ABAP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SDEST_FIELDS_TYPE_RFC_ABAP>-DESCRIPTION = 1.
<SDEST_FIELDS_TYPE_RFC_ABAP>-UI_LOCK = 1.
<SDEST_FIELDS_TYPE_RFC_ABAP>-LOAD_BALANCING = 1.
<SDEST_FIELDS_TYPE_RFC_ABAP>-SYSTEM_IDENTIFIER = 1.
<SDEST_FIELDS_TYPE_RFC_ABAP>-SYSTEM_NUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SDEST_FIELDS_TYPE_RFC_ABAP-SERVER_NAME, sy-vline,
  WA_SDEST_FIELDS_TYPE_RFC_ABAP-GROUP_NAME, sy-vline,
  WA_SDEST_FIELDS_TYPE_RFC_ABAP-SAVE_AS_HOSTNAME, sy-vline,
  WA_SDEST_FIELDS_TYPE_RFC_ABAP-ENABLE_TRACE, sy-vline,
  WA_SDEST_FIELDS_TYPE_RFC_ABAP-TRUSTED_SYSTEM, sy-vline,
  WA_SDEST_FIELDS_TYPE_RFC_ABAP-RFCLOGON_GUI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SDEST_FIELDS_TYPE_RFC_ABAP 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_SDEST_FIELDS_TYPE_RFC_ABAP 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_SDEST_FIELDS_TYPE_RFC_ABAP INTO WA_SDEST_FIELDS_TYPE_RFC_ABAP.


*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_SDEST_FIELDS_TYPE_RFC_ABAP_STR, 
DESCRIPTION TYPE STRING,
UI_LOCK TYPE STRING,
LOAD_BALANCING TYPE STRING,
SYSTEM_IDENTIFIER TYPE STRING,
SYSTEM_NUMBER TYPE STRING,
SERVER_NAME TYPE STRING,
GROUP_NAME TYPE STRING,
SAVE_AS_HOSTNAME TYPE STRING,
ENABLE_TRACE TYPE STRING,
TRUSTED_SYSTEM TYPE STRING,
RFCLOGON_GUI TYPE STRING,
LOGON_LANGUAGE TYPE STRING,
LOGON_CLIENT TYPE STRING,
LOGON_USER TYPE STRING,
SAME_USER TYPE STRING,
GATEWAY_HOST TYPE STRING,
GATEWAY_SERVICE TYPE STRING,
TRFC_BG_SUPRESS TYPE STRING,
TRFC_BG_REPETITIONS TYPE STRING,
TRFC_BG_DELAY TYPE STRING,
ARFC_ACTIVE TYPE STRING,
ARFC_METHOD TYPE STRING,
ARFC_CYCLE TYPE STRING,
SNC_ACTIVE TYPE STRING,
SNC_PARAMETER TYPE STRING,
CONVERSION_MODE TYPE STRING,
CONVERSION_BYTES TYPE STRING,
UNICODE_BYTES TYPE STRING,
RFC_BITMAP TYPE STRING,
RFC_WAN TYPE STRING,
MDMP_SETTINGS_ACTIVE TYPE STRING,
MDMP_LIST TYPE STRING,
AUTHORIZATION_PARAMETER TYPE STRING,
QRFC_VERSION TYPE STRING,
EXPORT_TRACE TYPE STRING,
KEEPALIVE_TIMEOUT TYPE STRING,
BASXML_ACTIVE TYPE STRING,
EXPLICIT_CODEPAGE_ACTIVE TYPE STRING,
LANGUAGE_CODEPAGE_ACTIVE TYPE STRING,
CLIENT_CODEPAGE_ACTIVE TYPE STRING,
EXPLICIT_CODEPAGE TYPE STRING,
CALLBACK_WHITELIST TYPE STRING,
CALLBACK_WHITELIST_ACTIVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SDEST_FIELDS_TYPE_RFC_ABAP_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_SDEST_FIELDS_TYPE_RFC_ABAP_STR-DESCRIPTION sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-UI_LOCK sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-LOAD_BALANCING sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SYSTEM_IDENTIFIER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SYSTEM_NUMBER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SERVER_NAME sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-GROUP_NAME sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SAVE_AS_HOSTNAME sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-ENABLE_TRACE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-TRUSTED_SYSTEM sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-RFCLOGON_GUI sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-LOGON_LANGUAGE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-LOGON_CLIENT sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-LOGON_USER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SAME_USER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-GATEWAY_HOST sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-GATEWAY_SERVICE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-TRFC_BG_SUPRESS sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-TRFC_BG_REPETITIONS sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-TRFC_BG_DELAY sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-ARFC_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-ARFC_METHOD sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-ARFC_CYCLE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SNC_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-SNC_PARAMETER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-CONVERSION_MODE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-CONVERSION_BYTES sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-UNICODE_BYTES sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-RFC_BITMAP sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-RFC_WAN sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-MDMP_SETTINGS_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-MDMP_LIST sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-AUTHORIZATION_PARAMETER sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-QRFC_VERSION sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-EXPORT_TRACE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-KEEPALIVE_TIMEOUT sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-BASXML_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-EXPLICIT_CODEPAGE_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-LANGUAGE_CODEPAGE_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-CLIENT_CODEPAGE_ACTIVE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-EXPLICIT_CODEPAGE sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-CALLBACK_WHITELIST sy-vline 
WA_SDEST_FIELDS_TYPE_RFC_ABAP_STR-CALLBACK_WHITELIST_ACTIVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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