ABAP Select data from SAP table RMCSV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMCSV
*  INTO TABLE @DATA(IT_RMCSV2).
*--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_RMCSV INDEX 1 INTO DATA(WA_RMCSV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMCSV>-SELVS = 1.
<RMCSV>-MCINF = 1.
<RMCSV>-ISTXT = 1.
<RMCSV>-SETXT = 1.
<RMCSV>-XVERDICHT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMCSV-AKTPER, sy-vline,
  WA_RMCSV-XDYNPER, sy-vline,
  WA_RMCSV-MCPER, sy-vline,
  WA_RMCSV-VSELVS, sy-vline,
  WA_RMCSV-KURST, sy-vline,
  WA_RMCSV-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMCSV 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_RMCSV 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_RMCSV INTO WA_RMCSV.


*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_RMCSV_STR, 
SELVS TYPE STRING,
MCINF TYPE STRING,
ISTXT TYPE STRING,
SETXT TYPE STRING,
XVERDICHT TYPE STRING,
AKTPER TYPE STRING,
XDYNPER TYPE STRING,
MCPER TYPE STRING,
VSELVS TYPE STRING,
KURST TYPE STRING,
WAERS TYPE STRING,
MERKMAL TYPE STRING,
KENNZAHL TYPE STRING,
MCAPP TYPE STRING,
DLINAM TYPE STRING,
SELSET TYPE STRING,
UNAME TYPE STRING,
MCROBNR TYPE STRING,
MCROBTX TYPE STRING,
MCROBNT TYPE STRING,
FACTOR TYPE STRING,
ODECIMALS TYPE STRING,
MMSPB TYPE STRING,
KZSPB TYPE STRING,
MCPERZ TYPE STRING,
SELVSPFX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMCSV_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_RMCSV_STR-SELVS sy-vline 
WA_RMCSV_STR-MCINF sy-vline 
WA_RMCSV_STR-ISTXT sy-vline 
WA_RMCSV_STR-SETXT sy-vline 
WA_RMCSV_STR-XVERDICHT sy-vline 
WA_RMCSV_STR-AKTPER sy-vline 
WA_RMCSV_STR-XDYNPER sy-vline 
WA_RMCSV_STR-MCPER sy-vline 
WA_RMCSV_STR-VSELVS sy-vline 
WA_RMCSV_STR-KURST sy-vline 
WA_RMCSV_STR-WAERS sy-vline 
WA_RMCSV_STR-MERKMAL sy-vline 
WA_RMCSV_STR-KENNZAHL sy-vline 
WA_RMCSV_STR-MCAPP sy-vline 
WA_RMCSV_STR-DLINAM sy-vline 
WA_RMCSV_STR-SELSET sy-vline 
WA_RMCSV_STR-UNAME sy-vline 
WA_RMCSV_STR-MCROBNR sy-vline 
WA_RMCSV_STR-MCROBTX sy-vline 
WA_RMCSV_STR-MCROBNT sy-vline 
WA_RMCSV_STR-FACTOR sy-vline 
WA_RMCSV_STR-ODECIMALS sy-vline 
WA_RMCSV_STR-MMSPB sy-vline 
WA_RMCSV_STR-KZSPB sy-vline 
WA_RMCSV_STR-MCPERZ sy-vline 
WA_RMCSV_STR-SELVSPFX sy-vline      INTO ld_text SEPARATED BY SPACE.

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