ABAP Select data from SAP table DMC_S_RTO_MD_FIELDTAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_S_RTO_MD_FIELDTAB
*  INTO TABLE @DATA(IT_DMC_S_RTO_MD_FIELDTAB2).
*--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_DMC_S_RTO_MD_FIELDTAB INDEX 1 INTO DATA(WA_DMC_S_RTO_MD_FIELDTAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_S_RTO_MD_FIELDTAB>-SYSTEMTYPE = 1.
<DMC_S_RTO_MD_FIELDTAB>-STRUCNAME = 1.
<DMC_S_RTO_MD_FIELDTAB>-GUID = 1.
<DMC_S_RTO_MD_FIELDTAB>-DSTRUCTURE = 1.
<DMC_S_RTO_MD_FIELDTAB>-FORKEYFELD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_S_RTO_MD_FIELDTAB-FIELDNAME, sy-vline,
  WA_DMC_S_RTO_MD_FIELDTAB-IDENT, sy-vline,
  WA_DMC_S_RTO_MD_FIELDTAB-KEYFLAG, sy-vline,
  WA_DMC_S_RTO_MD_FIELDTAB-SUPPLY_STATUS, sy-vline,
  WA_DMC_S_RTO_MD_FIELDTAB-LEN, sy-vline,
  WA_DMC_S_RTO_MD_FIELDTAB-OUTPUTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_S_RTO_MD_FIELDTAB 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_DMC_S_RTO_MD_FIELDTAB 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_DMC_S_RTO_MD_FIELDTAB INTO WA_DMC_S_RTO_MD_FIELDTAB.


*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_DMC_S_RTO_MD_FIELDTAB_STR, 
SYSTEMTYPE TYPE STRING,
STRUCNAME TYPE STRING,
GUID TYPE STRING,
DSTRUCTURE TYPE STRING,
FORKEYFELD TYPE STRING,
FIELDNAME TYPE STRING,
IDENT TYPE STRING,
KEYFLAG TYPE STRING,
SUPPLY_STATUS TYPE STRING,
LEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECS TYPE STRING,
POS TYPE STRING,
INTTYPE TYPE STRING,
DATATYPE TYPE STRING,
SELPAR TYPE STRING,
TECHNICAL TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
SEQNR TYPE STRING,
NOT_INITIAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_S_RTO_MD_FIELDTAB_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_DMC_S_RTO_MD_FIELDTAB_STR-SYSTEMTYPE sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-STRUCNAME sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-GUID sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-DSTRUCTURE sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-FORKEYFELD sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-FIELDNAME sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-IDENT sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-KEYFLAG sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-SUPPLY_STATUS sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-LEN sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-OUTPUTLEN sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-DECS sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-POS sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-INTTYPE sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-DATATYPE sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-SELPAR sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-TECHNICAL sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-DOMNAME sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-ROLLNAME sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-SEQNR sy-vline 
WA_DMC_S_RTO_MD_FIELDTAB_STR-NOT_INITIAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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