ABAP Select data from SAP table RMCLS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMCLS
*  INTO TABLE @DATA(IT_RMCLS2).
*--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_RMCLS INDEX 1 INTO DATA(WA_RMCLS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMCLS>-MANDT = 1.
<RMCLS>-ABTEIL = 1.
<RMCLS>-AKTIV = 1.
<RMCLS>-ARTXT = 1.
<RMCLS>-CLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMCLS-CLASS1, sy-vline,
  WA_RMCLS-CLASSX, sy-vline,
  WA_RMCLS-KLAGR, sy-vline,
  WA_RMCLS-KLART, sy-vline,
  WA_RMCLS-KLBEZ, sy-vline,
  WA_RMCLS-KLBEZ1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMCLS 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_RMCLS 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_RMCLS INTO WA_RMCLS.


*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 MSEHI1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMCLS-MSEHI1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCLS-MSEHI1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMCLS-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCLS-AENNR.
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_RMCLS_STR, 
MANDT TYPE STRING,
ABTEIL TYPE STRING,
AKTIV TYPE STRING,
ARTXT TYPE STRING,
CLASS TYPE STRING,
CLASS1 TYPE STRING,
CLASSX TYPE STRING,
KLAGR TYPE STRING,
KLART TYPE STRING,
KLBEZ TYPE STRING,
KLBEZ1 TYPE STRING,
KLBEZX TYPE STRING,
KSCHL TYPE STRING,
MERKMA TYPE STRING,
MWERT1 TYPE STRING,
MWERT TYPE STRING,
ATWTB1 TYPE STRING,
ATWTB TYPE STRING,
MSEHI1 TYPE STRING,
MSEHI TYPE STRING,
EINHE TYPE STRING,
FLAG TYPE STRING,
XFLAG TYPE STRING,
COMPRESS TYPE STRING,
NOCOMPRESS TYPE STRING,
PAGIDX TYPE STRING,
PAGMAX TYPE STRING,
MERIDX TYPE STRING,
MERMAX TYPE STRING,
ANZSEL TYPE STRING,
ANZUO TYPE STRING,
ATBEZ TYPE STRING,
SICHT TYPE STRING,
STEXT TYPE STRING,
STUFE TYPE STRING,
STUFE1 TYPE STRING,
STUFEX TYPE STRING,
POSNR TYPE STRING,
TIEFE TYPE STRING,
TCODE TYPE STRING,
TTEXT TYPE STRING,
TTEXT1 TYPE STRING,
PROGRAMM TYPE STRING,
TRNAM TYPE STRING,
TRTYP TYPE STRING,
OBTAB TYPE STRING,
OBJEK TYPE STRING,
ZEIL77 TYPE STRING,
ZEIL771 TYPE STRING,
ZEIL772 TYPE STRING,
ZEIL773 TYPE STRING,
ZEIL774 TYPE STRING,
UNDER_LINE TYPE STRING,
LINE77 TYPE STRING,
LINE77A TYPE STRING,
LINE77B TYPE STRING,
LINE77C TYPE STRING,
LINE77D TYPE STRING,
ZEIL130A TYPE STRING,
ZEIL130B TYPE STRING,
ZEIL130C TYPE STRING,
ZEIL130D TYPE STRING,
MAFID TYPE STRING,
OBJ_INT TYPE STRING,
KLAS_KZ TYPE STRING,
KLAS_KZ1 TYPE STRING,
MWERT_INT TYPE STRING,
ATNAM TYPE STRING,
ATNAM1 TYPE STRING,
MODUS TYPE STRING,
MIXTEXT TYPE STRING,
MIXOBJECT TYPE STRING,
MIXOBJECT1 TYPE STRING,
OBTYP TYPE STRING,
OBTXT TYPE STRING,
DAR_OBJ TYPE STRING,
DAR_BEZ TYPE STRING,
DAR_MER TYPE STRING,
DAR_ATNAM TYPE STRING,
DAR_UBER TYPE STRING,
DAR_EIN TYPE STRING,
DAR_NORM TYPE STRING,
DAR_UNB TYPE STRING,
DAR_SPERR TYPE STRING,
DAR_UNV TYPE STRING,
DAR_SRT TYPE STRING,
DAR_SRT_N TYPE STRING,
DAR_SRT_A TYPE STRING,
DAR_OBJINT TYPE STRING,
DAR_KLASKZ TYPE STRING,
DAR_OBTYP TYPE STRING,
NAME TYPE STRING,
REPTI TYPE STRING,
SRC_STRING TYPE STRING,
SEL_STRING TYPE STRING,
SEL_FLOAT TYPE STRING,
VALID_AT TYPE STRING,
KEY_DATE TYPE STRING,
SU_AND TYPE STRING,
SU_OR TYPE STRING,
SU_NAND TYPE STRING,
SU_NOR TYPE STRING,
MAX_HITS TYPE STRING,
NOT_ALL_OBTABS TYPE STRING,
AENNR TYPE STRING,
EFFE_DATUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMCLS_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_RMCLS_STR-MANDT sy-vline 
WA_RMCLS_STR-ABTEIL sy-vline 
WA_RMCLS_STR-AKTIV sy-vline 
WA_RMCLS_STR-ARTXT sy-vline 
WA_RMCLS_STR-CLASS sy-vline 
WA_RMCLS_STR-CLASS1 sy-vline 
WA_RMCLS_STR-CLASSX sy-vline 
WA_RMCLS_STR-KLAGR sy-vline 
WA_RMCLS_STR-KLART sy-vline 
WA_RMCLS_STR-KLBEZ sy-vline 
WA_RMCLS_STR-KLBEZ1 sy-vline 
WA_RMCLS_STR-KLBEZX sy-vline 
WA_RMCLS_STR-KSCHL sy-vline 
WA_RMCLS_STR-MERKMA sy-vline 
WA_RMCLS_STR-MWERT1 sy-vline 
WA_RMCLS_STR-MWERT sy-vline 
WA_RMCLS_STR-ATWTB1 sy-vline 
WA_RMCLS_STR-ATWTB sy-vline 
WA_RMCLS_STR-MSEHI1 sy-vline 
WA_RMCLS_STR-MSEHI sy-vline 
WA_RMCLS_STR-EINHE sy-vline 
WA_RMCLS_STR-FLAG sy-vline 
WA_RMCLS_STR-XFLAG sy-vline 
WA_RMCLS_STR-COMPRESS sy-vline 
WA_RMCLS_STR-NOCOMPRESS sy-vline 
WA_RMCLS_STR-PAGIDX sy-vline 
WA_RMCLS_STR-PAGMAX sy-vline 
WA_RMCLS_STR-MERIDX sy-vline 
WA_RMCLS_STR-MERMAX sy-vline 
WA_RMCLS_STR-ANZSEL sy-vline 
WA_RMCLS_STR-ANZUO sy-vline 
WA_RMCLS_STR-ATBEZ sy-vline 
WA_RMCLS_STR-SICHT sy-vline 
WA_RMCLS_STR-STEXT sy-vline 
WA_RMCLS_STR-STUFE sy-vline 
WA_RMCLS_STR-STUFE1 sy-vline 
WA_RMCLS_STR-STUFEX sy-vline 
WA_RMCLS_STR-POSNR sy-vline 
WA_RMCLS_STR-TIEFE sy-vline 
WA_RMCLS_STR-TCODE sy-vline 
WA_RMCLS_STR-TTEXT sy-vline 
WA_RMCLS_STR-TTEXT1 sy-vline 
WA_RMCLS_STR-PROGRAMM sy-vline 
WA_RMCLS_STR-TRNAM sy-vline 
WA_RMCLS_STR-TRTYP sy-vline 
WA_RMCLS_STR-OBTAB sy-vline 
WA_RMCLS_STR-OBJEK sy-vline 
WA_RMCLS_STR-ZEIL77 sy-vline 
WA_RMCLS_STR-ZEIL771 sy-vline 
WA_RMCLS_STR-ZEIL772 sy-vline 
WA_RMCLS_STR-ZEIL773 sy-vline 
WA_RMCLS_STR-ZEIL774 sy-vline 
WA_RMCLS_STR-UNDER_LINE sy-vline 
WA_RMCLS_STR-LINE77 sy-vline 
WA_RMCLS_STR-LINE77A sy-vline 
WA_RMCLS_STR-LINE77B sy-vline 
WA_RMCLS_STR-LINE77C sy-vline 
WA_RMCLS_STR-LINE77D sy-vline 
WA_RMCLS_STR-ZEIL130A sy-vline 
WA_RMCLS_STR-ZEIL130B sy-vline 
WA_RMCLS_STR-ZEIL130C sy-vline 
WA_RMCLS_STR-ZEIL130D sy-vline 
WA_RMCLS_STR-MAFID sy-vline 
WA_RMCLS_STR-OBJ_INT sy-vline 
WA_RMCLS_STR-KLAS_KZ sy-vline 
WA_RMCLS_STR-KLAS_KZ1 sy-vline 
WA_RMCLS_STR-MWERT_INT sy-vline 
WA_RMCLS_STR-ATNAM sy-vline 
WA_RMCLS_STR-ATNAM1 sy-vline 
WA_RMCLS_STR-MODUS sy-vline 
WA_RMCLS_STR-MIXTEXT sy-vline 
WA_RMCLS_STR-MIXOBJECT sy-vline 
WA_RMCLS_STR-MIXOBJECT1 sy-vline 
WA_RMCLS_STR-OBTYP sy-vline 
WA_RMCLS_STR-OBTXT sy-vline 
WA_RMCLS_STR-DAR_OBJ sy-vline 
WA_RMCLS_STR-DAR_BEZ sy-vline 
WA_RMCLS_STR-DAR_MER sy-vline 
WA_RMCLS_STR-DAR_ATNAM sy-vline 
WA_RMCLS_STR-DAR_UBER sy-vline 
WA_RMCLS_STR-DAR_EIN sy-vline 
WA_RMCLS_STR-DAR_NORM sy-vline 
WA_RMCLS_STR-DAR_UNB sy-vline 
WA_RMCLS_STR-DAR_SPERR sy-vline 
WA_RMCLS_STR-DAR_UNV sy-vline 
WA_RMCLS_STR-DAR_SRT sy-vline 
WA_RMCLS_STR-DAR_SRT_N sy-vline 
WA_RMCLS_STR-DAR_SRT_A sy-vline 
WA_RMCLS_STR-DAR_OBJINT sy-vline 
WA_RMCLS_STR-DAR_KLASKZ sy-vline 
WA_RMCLS_STR-DAR_OBTYP sy-vline 
WA_RMCLS_STR-NAME sy-vline 
WA_RMCLS_STR-REPTI sy-vline 
WA_RMCLS_STR-SRC_STRING sy-vline 
WA_RMCLS_STR-SEL_STRING sy-vline 
WA_RMCLS_STR-SEL_FLOAT sy-vline 
WA_RMCLS_STR-VALID_AT sy-vline 
WA_RMCLS_STR-KEY_DATE sy-vline 
WA_RMCLS_STR-SU_AND sy-vline 
WA_RMCLS_STR-SU_OR sy-vline 
WA_RMCLS_STR-SU_NAND sy-vline 
WA_RMCLS_STR-SU_NOR sy-vline 
WA_RMCLS_STR-MAX_HITS sy-vline 
WA_RMCLS_STR-NOT_ALL_OBTABS sy-vline 
WA_RMCLS_STR-AENNR sy-vline 
WA_RMCLS_STR-EFFE_DATUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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