ABAP Select data from SAP table RFCDISPLAY 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 RFCDISPLAY 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 RFCDISPLAY. 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 RFCDISPLAY 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_RFCDISPLAY TYPE STANDARD TABLE OF RFCDISPLAY,
      WA_RFCDISPLAY TYPE RFCDISPLAY,
      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: <RFCDISPLAY> TYPE RFCDISPLAY.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFCDISPLAY
*  INTO TABLE @DATA(IT_RFCDISPLAY2).
*--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_RFCDISPLAY INDEX 1 INTO DATA(WA_RFCDISPLAY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFCDISPLAY>-RFCDEST = 1.
<RFCDISPLAY>-RFCTYPE = 1.
<RFCDISPLAY>-RFCTYTEXT = 1.
<RFCDISPLAY>-RFCLOCK = 1.
<RFCDISPLAY>-RFCLOGON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFCDISPLAY-ARFCOPT, sy-vline,
  WA_RFCDISPLAY-PROXYUSER, sy-vline,
  WA_RFCDISPLAY-PROXYPW, sy-vline,
  WA_RFCDISPLAY-SSLAPPLIC, sy-vline,
  WA_RFCDISPLAY-PFADPRE, sy-vline,
  WA_RFCDISPLAY-RFCHTTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFCDISPLAY 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_RFCDISPLAY 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_RFCDISPLAY INTO WA_RFCDISPLAY.


*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 RFCLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RFCDISPLAY-RFCLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFCDISPLAY-RFCLANG.
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_RFCDISPLAY_STR, 
RFCDEST TYPE STRING,
RFCTYPE TYPE STRING,
RFCTYTEXT TYPE STRING,
RFCLOCK TYPE STRING,
RFCLOGON TYPE STRING,
ARFCOPT TYPE STRING,
PROXYUSER TYPE STRING,
PROXYPW TYPE STRING,
SSLAPPLIC TYPE STRING,
PFADPRE TYPE STRING,
RFCHTTP TYPE STRING,
UCCAPABLE TYPE STRING,
RFCCATEGORY TYPE STRING,
REACTTRC TYPE STRING,
BASXML_SETTINGS TYPE STRING,
TRACE_SETTINGS TYPE STRING,
SCC_ENABLED TYPE STRING,
NSC_MODE TYPE STRING,
SERIALIZER_VERSION TYPE STRING,
RFCHOST TYPE STRING,
RFCSERVICE TYPE STRING,
RFCALIAS TYPE STRING,
RFCCLIENT TYPE STRING,
RFCUSER TYPE STRING,
RFCLANG TYPE STRING,
RFCCOMPRES TYPE STRING,
RFCSCRAMBL TYPE STRING,
RFCNOKEEP TYPE STRING,
RFCEXIT TYPE STRING,
RFCNOWAIT TYPE STRING,
RFCAUTH TYPE STRING,
RFCTRACE TYPE STRING,
RFCPWSCR TYPE STRING,
RFCEXEC TYPE STRING,
RFCGWHOST TYPE STRING,
RFCGWSERV TYPE STRING,
RFCSYSID TYPE STRING,
RFCKEEP TYPE STRING,
BTCSUPPR TYPE STRING,
BTCTRIES TYPE STRING,
BTCDELAY TYPE STRING,
RFCLBFLAG TYPE STRING,
RFCSAMEUSR TYPE STRING,
RFCARFCOPT TYPE STRING,
RFCSLOGIN TYPE STRING,
RFCTSYSOPT TYPE STRING,
RFCSNC TYPE STRING,
RFCINFO TYPE STRING,
RFCWAN TYPE STRING,
RFCUNICODE TYPE STRING,
RFCCONVERT TYPE STRING,
RFCCONVX TYPE STRING,
RFCBITMAP TYPE STRING,
AUTHORITY TYPE STRING,
RFCREST TYPE STRING,
SAVESERVER TYPE STRING,
CPICTIMEOUT TYPE STRING,
KEEPALIVETIMEOUT TYPE STRING,
TRACEPROPAGATION TYPE STRING,
STARTTYPE TYPE STRING,
RFCSERIAL TYPE STRING,
QRFCVERS TYPE STRING,
RFCEXT TYPE STRING,
ENFORCE_CODEPAGE TYPE STRING,
MQTTUSER TYPE STRING,
MQTTPW TYPE STRING,
SCC_LOCATION_ID TYPE STRING,
SUPRESS_LOGON_SCREEN TYPE STRING,
NOCCERT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFCDISPLAY_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_RFCDISPLAY_STR-RFCDEST sy-vline 
WA_RFCDISPLAY_STR-RFCTYPE sy-vline 
WA_RFCDISPLAY_STR-RFCTYTEXT sy-vline 
WA_RFCDISPLAY_STR-RFCLOCK sy-vline 
WA_RFCDISPLAY_STR-RFCLOGON sy-vline 
WA_RFCDISPLAY_STR-ARFCOPT sy-vline 
WA_RFCDISPLAY_STR-PROXYUSER sy-vline 
WA_RFCDISPLAY_STR-PROXYPW sy-vline 
WA_RFCDISPLAY_STR-SSLAPPLIC sy-vline 
WA_RFCDISPLAY_STR-PFADPRE sy-vline 
WA_RFCDISPLAY_STR-RFCHTTP sy-vline 
WA_RFCDISPLAY_STR-UCCAPABLE sy-vline 
WA_RFCDISPLAY_STR-RFCCATEGORY sy-vline 
WA_RFCDISPLAY_STR-REACTTRC sy-vline 
WA_RFCDISPLAY_STR-BASXML_SETTINGS sy-vline 
WA_RFCDISPLAY_STR-TRACE_SETTINGS sy-vline 
WA_RFCDISPLAY_STR-SCC_ENABLED sy-vline 
WA_RFCDISPLAY_STR-NSC_MODE sy-vline 
WA_RFCDISPLAY_STR-SERIALIZER_VERSION sy-vline 
WA_RFCDISPLAY_STR-RFCHOST sy-vline 
WA_RFCDISPLAY_STR-RFCSERVICE sy-vline 
WA_RFCDISPLAY_STR-RFCALIAS sy-vline 
WA_RFCDISPLAY_STR-RFCCLIENT sy-vline 
WA_RFCDISPLAY_STR-RFCUSER sy-vline 
WA_RFCDISPLAY_STR-RFCLANG sy-vline 
WA_RFCDISPLAY_STR-RFCCOMPRES sy-vline 
WA_RFCDISPLAY_STR-RFCSCRAMBL sy-vline 
WA_RFCDISPLAY_STR-RFCNOKEEP sy-vline 
WA_RFCDISPLAY_STR-RFCEXIT sy-vline 
WA_RFCDISPLAY_STR-RFCNOWAIT sy-vline 
WA_RFCDISPLAY_STR-RFCAUTH sy-vline 
WA_RFCDISPLAY_STR-RFCTRACE sy-vline 
WA_RFCDISPLAY_STR-RFCPWSCR sy-vline 
WA_RFCDISPLAY_STR-RFCEXEC sy-vline 
WA_RFCDISPLAY_STR-RFCGWHOST sy-vline 
WA_RFCDISPLAY_STR-RFCGWSERV sy-vline 
WA_RFCDISPLAY_STR-RFCSYSID sy-vline 
WA_RFCDISPLAY_STR-RFCKEEP sy-vline 
WA_RFCDISPLAY_STR-BTCSUPPR sy-vline 
WA_RFCDISPLAY_STR-BTCTRIES sy-vline 
WA_RFCDISPLAY_STR-BTCDELAY sy-vline 
WA_RFCDISPLAY_STR-RFCLBFLAG sy-vline 
WA_RFCDISPLAY_STR-RFCSAMEUSR sy-vline 
WA_RFCDISPLAY_STR-RFCARFCOPT sy-vline 
WA_RFCDISPLAY_STR-RFCSLOGIN sy-vline 
WA_RFCDISPLAY_STR-RFCTSYSOPT sy-vline 
WA_RFCDISPLAY_STR-RFCSNC sy-vline 
WA_RFCDISPLAY_STR-RFCINFO sy-vline 
WA_RFCDISPLAY_STR-RFCWAN sy-vline 
WA_RFCDISPLAY_STR-RFCUNICODE sy-vline 
WA_RFCDISPLAY_STR-RFCCONVERT sy-vline 
WA_RFCDISPLAY_STR-RFCCONVX sy-vline 
WA_RFCDISPLAY_STR-RFCBITMAP sy-vline 
WA_RFCDISPLAY_STR-AUTHORITY sy-vline 
WA_RFCDISPLAY_STR-RFCREST sy-vline 
WA_RFCDISPLAY_STR-SAVESERVER sy-vline 
WA_RFCDISPLAY_STR-CPICTIMEOUT sy-vline 
WA_RFCDISPLAY_STR-KEEPALIVETIMEOUT sy-vline 
WA_RFCDISPLAY_STR-TRACEPROPAGATION sy-vline 
WA_RFCDISPLAY_STR-STARTTYPE sy-vline 
WA_RFCDISPLAY_STR-RFCSERIAL sy-vline 
WA_RFCDISPLAY_STR-QRFCVERS sy-vline 
WA_RFCDISPLAY_STR-RFCEXT sy-vline 
WA_RFCDISPLAY_STR-ENFORCE_CODEPAGE sy-vline 
WA_RFCDISPLAY_STR-MQTTUSER sy-vline 
WA_RFCDISPLAY_STR-MQTTPW sy-vline 
WA_RFCDISPLAY_STR-SCC_LOCATION_ID sy-vline 
WA_RFCDISPLAY_STR-SUPRESS_LOGON_SCREEN sy-vline 
WA_RFCDISPLAY_STR-NOCCERT sy-vline      INTO ld_text SEPARATED BY SPACE.

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