ABAP Select data from SAP table RFC_SYSTEM_INFO_RESPONSE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFC_SYSTEM_INFO_RESPONSE
*  INTO TABLE @DATA(IT_RFC_SYSTEM_INFO_RESPONSE2).
*--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_RFC_SYSTEM_INFO_RESPONSE INDEX 1 INTO DATA(WA_RFC_SYSTEM_INFO_RESPONSE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFC_SYSTEM_INFO_RESPONSE>-CONTROLLER = 1.
<RFC_SYSTEM_INFO_RESPONSE>-CURRENT_RESOURCES = 1.
<RFC_SYSTEM_INFO_RESPONSE>-MAXIMAL_RESOURCES = 1.
<RFC_SYSTEM_INFO_RESPONSE>-RECOMMENDED_DELAY = 1.
<RFC_SYSTEM_INFO_RESPONSE>-RFCSI_EXPORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFC_SYSTEM_INFO_RESPONSE-CONTROLLER, sy-vline,
  WA_RFC_SYSTEM_INFO_RESPONSE-RFCPROTO, sy-vline,
  WA_RFC_SYSTEM_INFO_RESPONSE-RFCCHARTYP, sy-vline,
  WA_RFC_SYSTEM_INFO_RESPONSE-RFCINTTYP, sy-vline,
  WA_RFC_SYSTEM_INFO_RESPONSE-RFCFLOTYP, sy-vline,
  WA_RFC_SYSTEM_INFO_RESPONSE-RFCDEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFC_SYSTEM_INFO_RESPONSE 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_RFC_SYSTEM_INFO_RESPONSE 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_RFC_SYSTEM_INFO_RESPONSE INTO WA_RFC_SYSTEM_INFO_RESPONSE.


*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_RFC_SYSTEM_INFO_RESPONSE_STR, 
CONTROLLER TYPE STRING,
CURRENT_RESOURCES TYPE STRING,
MAXIMAL_RESOURCES TYPE STRING,
RECOMMENDED_DELAY TYPE STRING,
RFCSI_EXPORT TYPE STRING,
CONTROLLER TYPE STRING,
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,END OF T_EKKO_STR.
DATA: WA_RFC_SYSTEM_INFO_RESPONSE_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_RFC_SYSTEM_INFO_RESPONSE_STR-CONTROLLER sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-CURRENT_RESOURCES sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-MAXIMAL_RESOURCES sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RECOMMENDED_DELAY sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCSI_EXPORT sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-CONTROLLER sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCPROTO sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCCHARTYP sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCINTTYP sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCFLOTYP sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCDEST sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCHOST sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCSYSID sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCDATABS sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCDBHOST sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCDBSYS sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCSAPRL sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCMACH sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCOPSYS sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCTZONE sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCDAYST sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCIPADDR sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCKERNRL sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCHOST2 sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCSI_RESV sy-vline 
WA_RFC_SYSTEM_INFO_RESPONSE_STR-RFCIPV6ADDR sy-vline      INTO ld_text SEPARATED BY SPACE.

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