ABAP Select data from SAP table RMXMS_ROM_MAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMXMS_ROM_MAT
*  INTO TABLE @DATA(IT_RMXMS_ROM_MAT2).
*--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_RMXMS_ROM_MAT INDEX 1 INTO DATA(WA_RMXMS_ROM_MAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMXMS_ROM_MAT>-POSNR = 1.
<RMXMS_ROM_MAT>-RECN = 1.
<RMXMS_ROM_MAT>-MATNR = 1.
<RMXMS_ROM_MAT>-STREAM_ID = 1.
<RMXMS_ROM_MAT>-DESCR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMXMS_ROM_MAT-TYPE, sy-vline,
  WA_RMXMS_ROM_MAT-TGT_QUANT, sy-vline,
  WA_RMXMS_ROM_MAT-TGT_UNIT, sy-vline,
  WA_RMXMS_ROM_MAT-LOW_LIMIT, sy-vline,
  WA_RMXMS_ROM_MAT-LOW_OP, sy-vline,
  WA_RMXMS_ROM_MAT-UP_LIMIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMXMS_ROM_MAT 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_RMXMS_ROM_MAT 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_RMXMS_ROM_MAT INTO WA_RMXMS_ROM_MAT.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMXMS_ROM_MAT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMXMS_ROM_MAT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_RMXMS_ROM_MAT-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMXMS_ROM_MAT-SUBID.
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_RMXMS_ROM_MAT_STR, 
POSNR TYPE STRING,
RECN TYPE STRING,
MATNR TYPE STRING,
STREAM_ID TYPE STRING,
DESCR TYPE STRING,
TYPE TYPE STRING,
TGT_QUANT TYPE STRING,
TGT_UNIT TYPE STRING,
LOW_LIMIT TYPE STRING,
LOW_OP TYPE STRING,
UP_LIMIT TYPE STRING,
UP_OP TYPE STRING,
MASS_PERCENT TYPE STRING,
COMP_CAT TYPE STRING,
SUBID TYPE STRING,
PRIOUT_FLG TYPE STRING,
DUMMY_MATNR_FLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMXMS_ROM_MAT_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_RMXMS_ROM_MAT_STR-POSNR sy-vline 
WA_RMXMS_ROM_MAT_STR-RECN sy-vline 
WA_RMXMS_ROM_MAT_STR-MATNR sy-vline 
WA_RMXMS_ROM_MAT_STR-STREAM_ID sy-vline 
WA_RMXMS_ROM_MAT_STR-DESCR sy-vline 
WA_RMXMS_ROM_MAT_STR-TYPE sy-vline 
WA_RMXMS_ROM_MAT_STR-TGT_QUANT sy-vline 
WA_RMXMS_ROM_MAT_STR-TGT_UNIT sy-vline 
WA_RMXMS_ROM_MAT_STR-LOW_LIMIT sy-vline 
WA_RMXMS_ROM_MAT_STR-LOW_OP sy-vline 
WA_RMXMS_ROM_MAT_STR-UP_LIMIT sy-vline 
WA_RMXMS_ROM_MAT_STR-UP_OP sy-vline 
WA_RMXMS_ROM_MAT_STR-MASS_PERCENT sy-vline 
WA_RMXMS_ROM_MAT_STR-COMP_CAT sy-vline 
WA_RMXMS_ROM_MAT_STR-SUBID sy-vline 
WA_RMXMS_ROM_MAT_STR-PRIOUT_FLG sy-vline 
WA_RMXMS_ROM_MAT_STR-DUMMY_MATNR_FLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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