ABAP Select data from SAP table RFCTRUST_OLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFCTRUST_OLD
*  INTO TABLE @DATA(IT_RFCTRUST_OLD2).
*--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_RFCTRUST_OLD INDEX 1 INTO DATA(WA_RFCTRUST_OLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFCTRUST_OLD>-RFCTRUSTID = 1.
<RFCTRUST_OLD>-RFCTRUSTSY = 1.
<RFCTRUST_OLD>-RFCTSTACTV = 1.
<RFCTRUST_OLD>-RFCMSGSRV = 1.
<RFCTRUST_OLD>-RFCGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFCTRUST_OLD-RFCSNC, sy-vline,
  WA_RFCTRUST_OLD-RFCDEST, sy-vline,
  WA_RFCTRUST_OLD-RFCCREDEST, sy-vline,
  WA_RFCTRUST_OLD-RFCREGDEST, sy-vline,
  WA_RFCTRUST_OLD-RFCVERSION, sy-vline,
  WA_RFCTRUST_OLD-RFCATRUSER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFCTRUST_OLD 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_RFCTRUST_OLD 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_RFCTRUST_OLD INTO WA_RFCTRUST_OLD.


*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_RFCTRUST_OLD_STR, 
RFCTRUSTID TYPE STRING,
RFCTRUSTSY TYPE STRING,
RFCTSTACTV TYPE STRING,
RFCMSGSRV TYPE STRING,
RFCGROUP TYPE STRING,
RFCSNC TYPE STRING,
RFCDEST TYPE STRING,
RFCCREDEST TYPE STRING,
RFCREGDEST TYPE STRING,
RFCVERSION TYPE STRING,
RFCATRUSER TYPE STRING,
RFCATRDATE TYPE STRING,
RFCCREUSER TYPE STRING,
RFCCREDATE TYPE STRING,
RFCSLOPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFCTRUST_OLD_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_RFCTRUST_OLD_STR-RFCTRUSTID sy-vline 
WA_RFCTRUST_OLD_STR-RFCTRUSTSY sy-vline 
WA_RFCTRUST_OLD_STR-RFCTSTACTV sy-vline 
WA_RFCTRUST_OLD_STR-RFCMSGSRV sy-vline 
WA_RFCTRUST_OLD_STR-RFCGROUP sy-vline 
WA_RFCTRUST_OLD_STR-RFCSNC sy-vline 
WA_RFCTRUST_OLD_STR-RFCDEST sy-vline 
WA_RFCTRUST_OLD_STR-RFCCREDEST sy-vline 
WA_RFCTRUST_OLD_STR-RFCREGDEST sy-vline 
WA_RFCTRUST_OLD_STR-RFCVERSION sy-vline 
WA_RFCTRUST_OLD_STR-RFCATRUSER sy-vline 
WA_RFCTRUST_OLD_STR-RFCATRDATE sy-vline 
WA_RFCTRUST_OLD_STR-RFCCREUSER sy-vline 
WA_RFCTRUST_OLD_STR-RFCCREDATE sy-vline 
WA_RFCTRUST_OLD_STR-RFCSLOPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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