ABAP Select data from SAP table FDT_S_DDIC_STRUCTURE_COMP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FDT_S_DDIC_STRUCTURE_COMP
*  INTO TABLE @DATA(IT_FDT_S_DDIC_STRUCTURE_COMP2).
*--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_FDT_S_DDIC_STRUCTURE_COMP INDEX 1 INTO DATA(WA_FDT_S_DDIC_STRUCTURE_COMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FDT_S_DDIC_STRUCTURE_COMP>-POSITION = 1.
<FDT_S_DDIC_STRUCTURE_COMP>-TABNAME = 1.
<FDT_S_DDIC_STRUCTURE_COMP>-COMPNAME = 1.
<FDT_S_DDIC_STRUCTURE_COMP>-COMP_METADATA = 1.
<FDT_S_DDIC_STRUCTURE_COMP>-ABSOLUTE_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FDT_S_DDIC_STRUCTURE_COMP-RELATIVE_NAME, sy-vline,
  WA_FDT_S_DDIC_STRUCTURE_COMP-KIND, sy-vline,
  WA_FDT_S_DDIC_STRUCTURE_COMP-TYPE_KIND, sy-vline,
  WA_FDT_S_DDIC_STRUCTURE_COMP-IS_DDIC_TYPE, sy-vline,
  WA_FDT_S_DDIC_STRUCTURE_COMP-SAPSCRIPT_OBJECT, sy-vline,
  WA_FDT_S_DDIC_STRUCTURE_COMP-ID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FDT_S_DDIC_STRUCTURE_COMP 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_FDT_S_DDIC_STRUCTURE_COMP 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_FDT_S_DDIC_STRUCTURE_COMP INTO WA_FDT_S_DDIC_STRUCTURE_COMP.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_FDT_S_DDIC_STRUCTURE_COMP-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FDT_S_DDIC_STRUCTURE_COMP-DATATYPE.
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_FDT_S_DDIC_STRUCTURE_COMP_STR, 
POSITION TYPE STRING,
TABNAME TYPE STRING,
COMPNAME TYPE STRING,
COMP_METADATA TYPE STRING,
ABSOLUTE_NAME TYPE STRING,
RELATIVE_NAME TYPE STRING,
KIND TYPE STRING,
TYPE_KIND TYPE STRING,
IS_DDIC_TYPE TYPE STRING,
SAPSCRIPT_OBJECT TYPE STRING,
ID TYPE STRING,
OBJECT TYPE STRING,
TEXT TYPE STRING,
SHORT_TEXT TYPE STRING,
SWITCH_ID TYPE STRING,
SWITCH_STATE TYPE STRING,
ELEMENT_PROP TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
POSITION TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
CONVEXIT TYPE STRING,
KEYFLAG TYPE STRING,
LOWERCASE TYPE STRING,
SIGN TYPE STRING,
NOAUTHCH TYPE STRING,
FIELDTEXT TYPE STRING,
NOTNULL TYPE STRING,
PRECFIELD TYPE STRING,
ADMINFIELD TYPE STRING,
SWITCH_ID TYPE STRING,
SWITCH_STATE TYPE STRING,
TEXTTABLE TYPE STRING,
SEARCHHELP TYPE STRING,
CHECKTABLE_TABCLASS TYPE STRING,
CHECKTABLE_VIEWCLASS TYPE STRING,
CHECKTABLE_LANGU_DEP TYPE STRING,
CHECKTABLE_NON_UNIQUE TYPE STRING,
FIXED_VALUES TYPE STRING,
HELP_ID TYPE STRING,
FIXED_VALUE_CONVERSION TYPE STRING,
STRUC_PROP TYPE STRING,
TABFORM TYPE STRING,
TABTYPE TYPE STRING,
FIELDLIST TYPE STRING,
TABLE_LINE_TYPENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FDT_S_DDIC_STRUCTURE_COMP_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_FDT_S_DDIC_STRUCTURE_COMP_STR-POSITION sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TABNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-COMPNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-COMP_METADATA sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-ABSOLUTE_NAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-RELATIVE_NAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-KIND sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TYPE_KIND sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-IS_DDIC_TYPE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SAPSCRIPT_OBJECT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-ID sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-OBJECT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TEXT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SHORT_TEXT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SWITCH_ID sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SWITCH_STATE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-ELEMENT_PROP sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TABNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-FIELDNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-POSITION sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-DOMNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-ROLLNAME sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CHECKTABLE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-LENG sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-OUTPUTLEN sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-DECIMALS sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-DATATYPE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-INTTYPE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-REFTABLE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-REFFIELD sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CONVEXIT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-KEYFLAG sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-LOWERCASE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SIGN sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-NOAUTHCH sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-FIELDTEXT sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-NOTNULL sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-PRECFIELD sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-ADMINFIELD sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SWITCH_ID sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SWITCH_STATE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TEXTTABLE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-SEARCHHELP sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CHECKTABLE_TABCLASS sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CHECKTABLE_VIEWCLASS sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CHECKTABLE_LANGU_DEP sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-CHECKTABLE_NON_UNIQUE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-FIXED_VALUES sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-HELP_ID sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-FIXED_VALUE_CONVERSION sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-STRUC_PROP sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TABFORM sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TABTYPE sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-FIELDLIST sy-vline 
WA_FDT_S_DDIC_STRUCTURE_COMP_STR-TABLE_LINE_TYPENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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