ABAP Select data from SAP table DMC_MC_S_STRUCT_FIELD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DMC_MC_S_STRUCT_FIELD 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_MC_S_STRUCT_FIELD. 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_MC_S_STRUCT_FIELD 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_MC_S_STRUCT_FIELD TYPE STANDARD TABLE OF DMC_MC_S_STRUCT_FIELD,
      WA_DMC_MC_S_STRUCT_FIELD TYPE DMC_MC_S_STRUCT_FIELD,
      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_MC_S_STRUCT_FIELD> TYPE DMC_MC_S_STRUCT_FIELD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_MC_S_STRUCT_FIELD
*  INTO TABLE @DATA(IT_DMC_MC_S_STRUCT_FIELD2).
*--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_MC_S_STRUCT_FIELD INDEX 1 INTO DATA(WA_DMC_MC_S_STRUCT_FIELD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_MC_S_STRUCT_FIELD>-GUID = 1.
<DMC_MC_S_STRUCT_FIELD>-DSTRUCTURE = 1.
<DMC_MC_S_STRUCT_FIELD>-FORKEYFELD = 1.
<DMC_MC_S_STRUCT_FIELD>-FIELDNAME = 1.
<DMC_MC_S_STRUCT_FIELD>-IDENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_MC_S_STRUCT_FIELD-KEYFLAG, sy-vline,
  WA_DMC_MC_S_STRUCT_FIELD-SCRTEXT_L, sy-vline,
  WA_DMC_MC_S_STRUCT_FIELD-SUPPLY_STATUS, sy-vline,
  WA_DMC_MC_S_STRUCT_FIELD-RULECALL, sy-vline,
  WA_DMC_MC_S_STRUCT_FIELD-SPLIT, sy-vline,
  WA_DMC_MC_S_STRUCT_FIELD-VERSIO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_MC_S_STRUCT_FIELD 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_MC_S_STRUCT_FIELD 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_MC_S_STRUCT_FIELD INTO WA_DMC_MC_S_STRUCT_FIELD.


*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_MC_S_STRUCT_FIELD_STR, 
GUID TYPE STRING,
DSTRUCTURE TYPE STRING,
FORKEYFELD TYPE STRING,
FIELDNAME TYPE STRING,
IDENT TYPE STRING,
KEYFLAG TYPE STRING,
SCRTEXT_L TYPE STRING,
SUPPLY_STATUS TYPE STRING,
RULECALL TYPE STRING,
SPLIT TYPE STRING,
VERSIO TYPE STRING,
CHNAM TYPE STRING,
CHANGEDATE TYPE STRING,
AUTHOR TYPE STRING,
CREATEDATE TYPE STRING,
DESCR TYPE STRING,
LEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECS TYPE STRING,
POS TYPE STRING,
INTTYPE TYPE STRING,
DATATYPE TYPE STRING,
IDFIELD TYPE STRING,
IDCHAR TYPE STRING,
GCHANGE TYPE STRING,
GCHGKIND TYPE STRING,
TYP_PROP TYPE STRING,
CHECKTABLE TYPE STRING,
GCCHAR TYPE STRING,
SELPAR TYPE STRING,
AGGREG TYPE STRING,
TECHNICAL TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
SEQNR TYPE STRING,
NOT_INITIAL TYPE STRING,
UPDATE_LOCK TYPE STRING,
EXT_TYPE TYPE STRING,
EXT_DECIMALS TYPE STRING,
EXT_LEN TYPE STRING,
IS_AMOUNT_FIELD TYPE STRING,
TOOLTIP_ID TYPE STRING,
GROUPTEXT_ID TYPE STRING,
COLUMN_HEADER_ID TYPE STRING,
INPUT_HELP_ID TYPE STRING,
CUSTOM_FIELD TYPE STRING,
GROUP_TEXT TYPE STRING,
FIELD TYPE STRING,
CELLSTYLE TYPE STRING,
IS_NEW TYPE STRING,
IS_ADDED TYPE STRING,
TOOLTIP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_MC_S_STRUCT_FIELD_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_MC_S_STRUCT_FIELD_STR-GUID sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-DSTRUCTURE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-FORKEYFELD sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-FIELDNAME sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IDENT sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-KEYFLAG sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-SCRTEXT_L sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-SUPPLY_STATUS sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-RULECALL sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-SPLIT sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-VERSIO sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CHNAM sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CHANGEDATE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-AUTHOR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CREATEDATE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-DESCR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-LEN sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-OUTPUTLEN sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-DECS sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-POS sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-INTTYPE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-DATATYPE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IDFIELD sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IDCHAR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-GCHANGE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-GCHGKIND sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-TYP_PROP sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CHECKTABLE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-GCCHAR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-SELPAR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-AGGREG sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-TECHNICAL sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-DOMNAME sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-ROLLNAME sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-SEQNR sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-NOT_INITIAL sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-UPDATE_LOCK sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-EXT_TYPE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-EXT_DECIMALS sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-EXT_LEN sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IS_AMOUNT_FIELD sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-TOOLTIP_ID sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-GROUPTEXT_ID sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-COLUMN_HEADER_ID sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-INPUT_HELP_ID sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CUSTOM_FIELD sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-GROUP_TEXT sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-FIELD sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-CELLSTYLE sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IS_NEW sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-IS_ADDED sy-vline 
WA_DMC_MC_S_STRUCT_FIELD_STR-TOOLTIP sy-vline      INTO ld_text SEPARATED BY SPACE.

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