ABAP Select data from SAP table RGSMV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RGSMV
*  INTO TABLE @DATA(IT_RGSMV2).
*--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_RGSMV INDEX 1 INTO DATA(WA_RGSMV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RGSMV>-SEQNR = 1.
<RGSMV>-LINE = 1.
<RGSMV>-LEVEL = 1.
<RGSMV>-FIELD = 1.
<RGSMV>-FROM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RGSMV-TO, sy-vline,
  WA_RGSMV-FLAG, sy-vline,
  WA_RGSMV-PUP, sy-vline,
  WA_RGSMV-PRTCLASS, sy-vline,
  WA_RGSMV-FPDOWN, sy-vline,
  WA_RGSMV-PMFLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RGSMV 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_RGSMV 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_RGSMV INTO WA_RGSMV.


*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_RGSMV_STR, 
SEQNR TYPE STRING,
LINE TYPE STRING,
LEVEL TYPE STRING,
FIELD TYPE STRING,
FROM TYPE STRING,
TO TYPE STRING,
FLAG TYPE STRING,
PUP TYPE STRING,
PRTCLASS TYPE STRING,
FPDOWN TYPE STRING,
PMFLAG TYPE STRING,
LNAME TYPE STRING,
ZPFLAG TYPE STRING,
TITLE TYPE STRING,
PFEED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RGSMV_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_RGSMV_STR-SEQNR sy-vline 
WA_RGSMV_STR-LINE sy-vline 
WA_RGSMV_STR-LEVEL sy-vline 
WA_RGSMV_STR-FIELD sy-vline 
WA_RGSMV_STR-FROM sy-vline 
WA_RGSMV_STR-TO sy-vline 
WA_RGSMV_STR-FLAG sy-vline 
WA_RGSMV_STR-PUP sy-vline 
WA_RGSMV_STR-PRTCLASS sy-vline 
WA_RGSMV_STR-FPDOWN sy-vline 
WA_RGSMV_STR-PMFLAG sy-vline 
WA_RGSMV_STR-LNAME sy-vline 
WA_RGSMV_STR-ZPFLAG sy-vline 
WA_RGSMV_STR-TITLE sy-vline 
WA_RGSMV_STR-PFEED sy-vline      INTO ld_text SEPARATED BY SPACE.

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