ABAP Select data from SAP table RCTVG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCTVG
*  INTO TABLE @DATA(IT_RCTVG2).
*--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_RCTVG INDEX 1 INTO DATA(WA_RCTVG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCTVG>-ATWRT = 1.
<RCTVG>-ATFLV = 1.
<RCTVG>-ATFLB = 1.
<RCTVG>-ATCOD = 1.
<RCTVG>-ATAWE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCTVG-ATAW1, sy-vline,
  WA_RCTVG-ATTLV, sy-vline,
  WA_RCTVG-ATTLB, sy-vline,
  WA_RCTVG-ATPRZ, sy-vline,
  WA_RCTVG-ATINC, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RCTVG 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_RCTVG 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_RCTVG INTO WA_RCTVG.


*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 CUNIT, internal->external for field ATAWE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RCTVG-ATAWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCTVG-ATAWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ATAW1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RCTVG-ATAW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCTVG-ATAW1.
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_RCTVG_STR, 
ATWRT TYPE STRING,
ATFLV TYPE STRING,
ATFLB TYPE STRING,
ATCOD TYPE STRING,
ATAWE TYPE STRING,
ATAW1 TYPE STRING,
ATTLV TYPE STRING,
ATTLB TYPE STRING,
ATPRZ TYPE STRING,
ATINC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCTVG_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_RCTVG_STR-ATWRT sy-vline 
WA_RCTVG_STR-ATFLV sy-vline 
WA_RCTVG_STR-ATFLB sy-vline 
WA_RCTVG_STR-ATCOD sy-vline 
WA_RCTVG_STR-ATAWE sy-vline 
WA_RCTVG_STR-ATAW1 sy-vline 
WA_RCTVG_STR-ATTLV sy-vline 
WA_RCTVG_STR-ATTLB sy-vline 
WA_RCTVG_STR-ATPRZ sy-vline 
WA_RCTVG_STR-ATINC sy-vline      INTO ld_text SEPARATED BY SPACE.

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