ABAP Select data from SAP table ROIS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ROIS
*  INTO TABLE @DATA(IT_ROIS2).
*--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_ROIS INDEX 1 INTO DATA(WA_ROIS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ROIS>-ISOURCE = 1.
<ROIS>-APPLNM = 1.
<ROIS>-ISOURCE_N = 1.
<ROIS>-FNAME = 1.
<ROIS>-STRUCTURE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ROIS-GENFLAG, sy-vline,
  WA_ROIS-FULLUPD, sy-vline,
  WA_ROIS-DELTAUPD, sy-vline,
  WA_ROIS-STOCKUPD, sy-vline,
  WA_ROIS-PACKGUPD, sy-vline,
  WA_ROIS-UNDEFINED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ROIS 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_ROIS 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_ROIS INTO WA_ROIS.


*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_ROIS_STR, 
ISOURCE TYPE STRING,
APPLNM TYPE STRING,
ISOURCE_N TYPE STRING,
FNAME TYPE STRING,
STRUCTURE TYPE STRING,
GENFLAG TYPE STRING,
FULLUPD TYPE STRING,
DELTAUPD TYPE STRING,
STOCKUPD TYPE STRING,
PACKGUPD TYPE STRING,
UNDEFINED TYPE STRING,
RELEASE TYPE STRING,
DIRTFLAG TYPE STRING,
CUSTFLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ROIS_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_ROIS_STR-ISOURCE sy-vline 
WA_ROIS_STR-APPLNM sy-vline 
WA_ROIS_STR-ISOURCE_N sy-vline 
WA_ROIS_STR-FNAME sy-vline 
WA_ROIS_STR-STRUCTURE sy-vline 
WA_ROIS_STR-GENFLAG sy-vline 
WA_ROIS_STR-FULLUPD sy-vline 
WA_ROIS_STR-DELTAUPD sy-vline 
WA_ROIS_STR-STOCKUPD sy-vline 
WA_ROIS_STR-PACKGUPD sy-vline 
WA_ROIS_STR-UNDEFINED sy-vline 
WA_ROIS_STR-RELEASE sy-vline 
WA_ROIS_STR-DIRTFLAG sy-vline 
WA_ROIS_STR-CUSTFLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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