ABAP Select data from SAP table SDDIC_ADT_TYPEINFO_DESCRIPTOR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SDDIC_ADT_TYPEINFO_DESCRIPTOR
*  INTO TABLE @DATA(IT_SDDIC_ADT_TYPEINFO_DESCRIPTOR2).
*--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_SDDIC_ADT_TYPEINFO_DESCRIPTOR INDEX 1 INTO DATA(WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SDDIC_ADT_TYPEINFO_DESCRIPTOR>-NAME = 1.
<SDDIC_ADT_TYPEINFO_DESCRIPTOR>-DISPLAY_NAME = 1.
<SDDIC_ADT_TYPEINFO_DESCRIPTOR>-DESCRIPTION = 1.
<SDDIC_ADT_TYPEINFO_DESCRIPTOR>-LANGUAGE = 1.
<SDDIC_ADT_TYPEINFO_DESCRIPTOR>-FIXED_VALS_SUPPORTED = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-CATEGORY_REF, sy-vline,
  WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-LENGTH_DESC, sy-vline,
  WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-DEFAULT_VALUE, sy-vline,
  WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-MIN_VALUE, sy-vline,
  WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-MAX_VALUE, sy-vline,
  WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-CHANGEABLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR 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_SDDIC_ADT_TYPEINFO_DESCRIPTOR 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_SDDIC_ADT_TYPEINFO_DESCRIPTOR INTO WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR.


*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 NAME
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-NAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR-NAME.
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_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR, 
NAME TYPE STRING,
DISPLAY_NAME TYPE STRING,
DESCRIPTION TYPE STRING,
LANGUAGE TYPE STRING,
FIXED_VALS_SUPPORTED TYPE STRING,
CATEGORY_REF TYPE STRING,
LENGTH_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
MIN_VALUE TYPE STRING,
MAX_VALUE TYPE STRING,
CHANGEABLE TYPE STRING,
RELEVANT TYPE STRING,
DECIMALS_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
MIN_VALUE TYPE STRING,
MAX_VALUE TYPE STRING,
CHANGEABLE TYPE STRING,
RELEVANT TYPE STRING,
OUTPUTLENGTH_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
MIN_VALUE TYPE STRING,
MAX_VALUE TYPE STRING,
CHANGEABLE TYPE STRING,
RELEVANT TYPE STRING,
OUTPUTSTYLE_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
RELEVANT TYPE STRING,
OUTPUT_STYLES TYPE STRING,
FORMATAMPM_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
RELEVANT TYPE STRING,
LOWERCASE_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
RELEVANT TYPE STRING,
SIGN_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
RELEVANT TYPE STRING,
CONVEXIT_DESC TYPE STRING,
DEFAULT_VALUE TYPE STRING,
RELEVANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_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_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-NAME sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DISPLAY_NAME sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DESCRIPTION sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-LANGUAGE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-FIXED_VALS_SUPPORTED sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-CATEGORY_REF sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-LENGTH_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MIN_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MAX_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-CHANGEABLE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DECIMALS_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MIN_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MAX_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-CHANGEABLE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-OUTPUTLENGTH_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MIN_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-MAX_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-CHANGEABLE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-OUTPUTSTYLE_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-OUTPUT_STYLES sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-FORMATAMPM_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-LOWERCASE_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-SIGN_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-CONVEXIT_DESC sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-DEFAULT_VALUE sy-vline 
WA_SDDIC_ADT_TYPEINFO_DESCRIPTOR_STR-RELEVANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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