ABAP Select data from SAP table RFC_ROA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFC_ROA 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_ROA. 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_ROA 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_ROA TYPE STANDARD TABLE OF RFC_ROA,
      WA_RFC_ROA TYPE RFC_ROA,
      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_ROA> TYPE RFC_ROA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFC_ROA
*  INTO TABLE @DATA(IT_RFC_ROA2).
*--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_ROA INDEX 1 INTO DATA(WA_RFC_ROA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFC_ROA>-IMODE = 1.
<RFC_ROA>-BELNR = 1.
<RFC_ROA>-GJAHR = 1.
<RFC_ROA>-BLART = 1.
<RFC_ROA>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFC_ROA-BUKRS, sy-vline,
  WA_RFC_ROA-GSBER, sy-vline,
  WA_RFC_ROA-BUDAT, sy-vline,
  WA_RFC_ROA-MONAT, sy-vline,
  WA_RFC_ROA-WAERS, sy-vline,
  WA_RFC_ROA-KURSF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFC_ROA 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_ROA 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_ROA INTO WA_RFC_ROA.


*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_ROA_STR, 
IMODE TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
BLART TYPE STRING,
BLDAT TYPE STRING,
BUKRS TYPE STRING,
GSBER TYPE STRING,
BUDAT TYPE STRING,
MONAT TYPE STRING,
WAERS TYPE STRING,
KURSF TYPE STRING,
WWERT TYPE STRING,
XBLNR TYPE STRING,
BKTXT TYPE STRING,
XBWAE TYPE STRING,
XRELI TYPE STRING,
KUNNR TYPE STRING,
XSKZG TYPE STRING,
XHKZG TYPE STRING,
UMSKZ TYPE STRING,
LOTKZ TYPE STRING,
XNREV TYPE STRING,
ZUONR TYPE STRING,
SGTXT TYPE STRING,
MANSP TYPE STRING,
GEST_GRP TYPE STRING,
HKTID TYPE STRING,
HBKID TYPE STRING,
XPAPER TYPE STRING,
XBRIEF TYPE STRING,
TXT1 TYPE STRING,
TXT2 TYPE STRING,
TXT3 TYPE STRING,
ATEXT1 TYPE STRING,
LOCSYS TYPE STRING,
PERSCH TYPE STRING,
PERSARC TYPE STRING,
REFAO TYPE STRING,
GROUPNR TYPE STRING,
ONACCKZ TYPE STRING,
BUDEX TYPE STRING,
FDUDT TYPE STRING,
INVCNR TYPE STRING,
INVCDT TYPE STRING,
INVCLC TYPE STRING,
PURONR TYPE STRING,
PURODT TYPE STRING,
PUROLC TYPE STRING,
CONTNR TYPE STRING,
CONTDT TYPE STRING,
CONTLC TYPE STRING,
CONTKZ TYPE STRING,
CONTDAT TYPE STRING,
CONTREG TYPE STRING,
DEMNR TYPE STRING,
DEMDT TYPE STRING,
DEMLC TYPE STRING,
FREPNR TYPE STRING,
FREPDT TYPE STRING,
FREPLC TYPE STRING,
REGLNR TYPE STRING,
REGLDT TYPE STRING,
REGLLC TYPE STRING,
AVISNR TYPE STRING,
AVISDT TYPE STRING,
AVISLC TYPE STRING,
OTHERNR TYPE STRING,
OTHERDT TYPE STRING,
OTHERLC TYPE STRING,
SI2WFID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFC_ROA_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_ROA_STR-IMODE sy-vline 
WA_RFC_ROA_STR-BELNR sy-vline 
WA_RFC_ROA_STR-GJAHR sy-vline 
WA_RFC_ROA_STR-BLART sy-vline 
WA_RFC_ROA_STR-BLDAT sy-vline 
WA_RFC_ROA_STR-BUKRS sy-vline 
WA_RFC_ROA_STR-GSBER sy-vline 
WA_RFC_ROA_STR-BUDAT sy-vline 
WA_RFC_ROA_STR-MONAT sy-vline 
WA_RFC_ROA_STR-WAERS sy-vline 
WA_RFC_ROA_STR-KURSF sy-vline 
WA_RFC_ROA_STR-WWERT sy-vline 
WA_RFC_ROA_STR-XBLNR sy-vline 
WA_RFC_ROA_STR-BKTXT sy-vline 
WA_RFC_ROA_STR-XBWAE sy-vline 
WA_RFC_ROA_STR-XRELI sy-vline 
WA_RFC_ROA_STR-KUNNR sy-vline 
WA_RFC_ROA_STR-XSKZG sy-vline 
WA_RFC_ROA_STR-XHKZG sy-vline 
WA_RFC_ROA_STR-UMSKZ sy-vline 
WA_RFC_ROA_STR-LOTKZ sy-vline 
WA_RFC_ROA_STR-XNREV sy-vline 
WA_RFC_ROA_STR-ZUONR sy-vline 
WA_RFC_ROA_STR-SGTXT sy-vline 
WA_RFC_ROA_STR-MANSP sy-vline 
WA_RFC_ROA_STR-GEST_GRP sy-vline 
WA_RFC_ROA_STR-HKTID sy-vline 
WA_RFC_ROA_STR-HBKID sy-vline 
WA_RFC_ROA_STR-XPAPER sy-vline 
WA_RFC_ROA_STR-XBRIEF sy-vline 
WA_RFC_ROA_STR-TXT1 sy-vline 
WA_RFC_ROA_STR-TXT2 sy-vline 
WA_RFC_ROA_STR-TXT3 sy-vline 
WA_RFC_ROA_STR-ATEXT1 sy-vline 
WA_RFC_ROA_STR-LOCSYS sy-vline 
WA_RFC_ROA_STR-PERSCH sy-vline 
WA_RFC_ROA_STR-PERSARC sy-vline 
WA_RFC_ROA_STR-REFAO sy-vline 
WA_RFC_ROA_STR-GROUPNR sy-vline 
WA_RFC_ROA_STR-ONACCKZ sy-vline 
WA_RFC_ROA_STR-BUDEX sy-vline 
WA_RFC_ROA_STR-FDUDT sy-vline 
WA_RFC_ROA_STR-INVCNR sy-vline 
WA_RFC_ROA_STR-INVCDT sy-vline 
WA_RFC_ROA_STR-INVCLC sy-vline 
WA_RFC_ROA_STR-PURONR sy-vline 
WA_RFC_ROA_STR-PURODT sy-vline 
WA_RFC_ROA_STR-PUROLC sy-vline 
WA_RFC_ROA_STR-CONTNR sy-vline 
WA_RFC_ROA_STR-CONTDT sy-vline 
WA_RFC_ROA_STR-CONTLC sy-vline 
WA_RFC_ROA_STR-CONTKZ sy-vline 
WA_RFC_ROA_STR-CONTDAT sy-vline 
WA_RFC_ROA_STR-CONTREG sy-vline 
WA_RFC_ROA_STR-DEMNR sy-vline 
WA_RFC_ROA_STR-DEMDT sy-vline 
WA_RFC_ROA_STR-DEMLC sy-vline 
WA_RFC_ROA_STR-FREPNR sy-vline 
WA_RFC_ROA_STR-FREPDT sy-vline 
WA_RFC_ROA_STR-FREPLC sy-vline 
WA_RFC_ROA_STR-REGLNR sy-vline 
WA_RFC_ROA_STR-REGLDT sy-vline 
WA_RFC_ROA_STR-REGLLC sy-vline 
WA_RFC_ROA_STR-AVISNR sy-vline 
WA_RFC_ROA_STR-AVISDT sy-vline 
WA_RFC_ROA_STR-AVISLC sy-vline 
WA_RFC_ROA_STR-OTHERNR sy-vline 
WA_RFC_ROA_STR-OTHERDT sy-vline 
WA_RFC_ROA_STR-OTHERLC sy-vline 
WA_RFC_ROA_STR-SI2WFID sy-vline      INTO ld_text SEPARATED BY SPACE.

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