ABAP Select data from SAP table DMC_RFC_SYSTEM_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_RFC_SYSTEM_DATA
*  INTO TABLE @DATA(IT_DMC_RFC_SYSTEM_DATA2).
*--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_DMC_RFC_SYSTEM_DATA INDEX 1 INTO DATA(WA_DMC_RFC_SYSTEM_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_RFC_SYSTEM_DATA>-RFCPROTO = 1.
<DMC_RFC_SYSTEM_DATA>-RFCCHARTYP = 1.
<DMC_RFC_SYSTEM_DATA>-RFCINTTYP = 1.
<DMC_RFC_SYSTEM_DATA>-RFCFLOTYP = 1.
<DMC_RFC_SYSTEM_DATA>-RFCDEST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_RFC_SYSTEM_DATA-RFCHOST, sy-vline,
  WA_DMC_RFC_SYSTEM_DATA-RFCSYSID, sy-vline,
  WA_DMC_RFC_SYSTEM_DATA-RFCDATABS, sy-vline,
  WA_DMC_RFC_SYSTEM_DATA-RFCDBHOST, sy-vline,
  WA_DMC_RFC_SYSTEM_DATA-RFCDBSYS, sy-vline,
  WA_DMC_RFC_SYSTEM_DATA-RFCSAPRL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_RFC_SYSTEM_DATA 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_DMC_RFC_SYSTEM_DATA 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_DMC_RFC_SYSTEM_DATA INTO WA_DMC_RFC_SYSTEM_DATA.


*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 IPADD, internal->external for field RFCIPV6ADDR
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_DMC_RFC_SYSTEM_DATA-RFCIPV6ADDR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DMC_RFC_SYSTEM_DATA-RFCIPV6ADDR.
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_DMC_RFC_SYSTEM_DATA_STR, 
RFCPROTO TYPE STRING,
RFCCHARTYP TYPE STRING,
RFCINTTYP TYPE STRING,
RFCFLOTYP TYPE STRING,
RFCDEST TYPE STRING,
RFCHOST TYPE STRING,
RFCSYSID TYPE STRING,
RFCDATABS TYPE STRING,
RFCDBHOST TYPE STRING,
RFCDBSYS TYPE STRING,
RFCSAPRL TYPE STRING,
RFCMACH TYPE STRING,
RFCOPSYS TYPE STRING,
RFCTZONE TYPE STRING,
RFCDAYST TYPE STRING,
RFCIPADDR TYPE STRING,
RFCKERNRL TYPE STRING,
RFCHOST2 TYPE STRING,
RFCSI_RESV TYPE STRING,
RFCIPV6ADDR TYPE STRING,
RFCCLIENT TYPE STRING,
RFCUSER TYPE STRING,
LOGIN_COMPLETE TYPE STRING,
IS_DIALOG_USER TYPE STRING,
NBR_CPU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_RFC_SYSTEM_DATA_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_DMC_RFC_SYSTEM_DATA_STR-RFCPROTO sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCCHARTYP sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCINTTYP sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCFLOTYP sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCDEST sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCHOST sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCSYSID sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCDATABS sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCDBHOST sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCDBSYS sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCSAPRL sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCMACH sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCOPSYS sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCTZONE sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCDAYST sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCIPADDR sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCKERNRL sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCHOST2 sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCSI_RESV sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCIPV6ADDR sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCCLIENT sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-RFCUSER sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-LOGIN_COMPLETE sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-IS_DIALOG_USER sy-vline 
WA_DMC_RFC_SYSTEM_DATA_STR-NBR_CPU sy-vline      INTO ld_text SEPARATED BY SPACE.

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