ABAP Select data from SAP table DDRTOBJCATALOGCOLUMNS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDRTOBJCATALOGCOLUMNS
*  INTO TABLE @DATA(IT_DDRTOBJCATALOGCOLUMNS2).
*--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_DDRTOBJCATALOGCOLUMNS INDEX 1 INTO DATA(WA_DDRTOBJCATALOGCOLUMNS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDRTOBJCATALOGCOLUMNS>-NAME = 1.
<DDRTOBJCATALOGCOLUMNS>-NAME_RAW = 1.
<DDRTOBJCATALOGCOLUMNS>-NAME_EXTERNAL = 1.
<DDRTOBJCATALOGCOLUMNS>-POSITION = 1.
<DDRTOBJCATALOGCOLUMNS>-POSITION_DB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDRTOBJCATALOGCOLUMNS-DDIC_TYPE_KIND, sy-vline,
  WA_DDRTOBJCATALOGCOLUMNS-DDIC_TYPE_NAME, sy-vline,
  WA_DDRTOBJCATALOGCOLUMNS-DECIMALS, sy-vline,
  WA_DDRTOBJCATALOGCOLUMNS-DIGITS, sy-vline,
  WA_DDRTOBJCATALOGCOLUMNS-LENGTH_ABAP, sy-vline,
  WA_DDRTOBJCATALOGCOLUMNS-LENGTH_DB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDRTOBJCATALOGCOLUMNS 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_DDRTOBJCATALOGCOLUMNS 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_DDRTOBJCATALOGCOLUMNS INTO WA_DDRTOBJCATALOGCOLUMNS.


*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_DDRTOBJCATALOGCOLUMNS_STR, 
NAME TYPE STRING,
NAME_RAW TYPE STRING,
NAME_EXTERNAL TYPE STRING,
POSITION TYPE STRING,
POSITION_DB TYPE STRING,
DDIC_TYPE_KIND TYPE STRING,
DDIC_TYPE_NAME TYPE STRING,
DECIMALS TYPE STRING,
DIGITS TYPE STRING,
LENGTH_ABAP TYPE STRING,
LENGTH_DB TYPE STRING,
LENGTH_OUTPUT TYPE STRING,
ALIGNMENT TYPE STRING,
DEPTH TYPE STRING,
OFFSET TYPE STRING,
CONVERSION_EXIT_NAME TYPE STRING,
SET_GET_PARAM_NAME TYPE STRING,
CHECK_TABLE_NAME TYPE STRING,
REF_FIELD_NAME TYPE STRING,
REF_TABLE_NAME TYPE STRING,
PRIMARY_KEY TYPE STRING,
DISPLAY_ALGEBRAIC_SIGN TYPE STRING,
CASE_SENSITIVE TYPE STRING,
OMIT_KEY_CHECK_ON_SCREEN TYPE STRING,
FIXVAL_DOMAIN TYPE STRING,
CHANGE_LOG TYPE STRING,
VALUE_INITIAL TYPE STRING,
VALUE_NULL TYPE STRING,
PACKED_NUMBER TYPE STRING,
VALUE_HELP_BY_TYPE TYPE STRING,
VALUE_HELP_EXPLICIT TYPE STRING,
DATA_ELEMENT_IS_REF TYPE STRING,
REF_TO_BUILD_IN_TYPE TYPE STRING,
TRANSLATION_RELEVANT TYPE STRING,
LEFT_TO_RIGHT TYPE STRING,
BIDI_CONTROL_CODE TYPE STRING,
WITHOUT_INPUT_HISTORY TYPE STRING,
OUTPUT_STYLE TYPE STRING,
AM_PM_FORMAT TYPE STRING,
VALUE_AS_LITERAL TYPE STRING,
COLUMN_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDRTOBJCATALOGCOLUMNS_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_DDRTOBJCATALOGCOLUMNS_STR-NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-NAME_RAW sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-NAME_EXTERNAL sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-POSITION sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-POSITION_DB sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DDIC_TYPE_KIND sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DDIC_TYPE_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DECIMALS sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DIGITS sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-LENGTH_ABAP sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-LENGTH_DB sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-LENGTH_OUTPUT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-ALIGNMENT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DEPTH sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-OFFSET sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-CONVERSION_EXIT_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-SET_GET_PARAM_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-CHECK_TABLE_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-REF_FIELD_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-REF_TABLE_NAME sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-PRIMARY_KEY sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DISPLAY_ALGEBRAIC_SIGN sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-CASE_SENSITIVE sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-OMIT_KEY_CHECK_ON_SCREEN sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-FIXVAL_DOMAIN sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-CHANGE_LOG sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-VALUE_INITIAL sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-VALUE_NULL sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-PACKED_NUMBER sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-VALUE_HELP_BY_TYPE sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-VALUE_HELP_EXPLICIT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-DATA_ELEMENT_IS_REF sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-REF_TO_BUILD_IN_TYPE sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-TRANSLATION_RELEVANT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-LEFT_TO_RIGHT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-BIDI_CONTROL_CODE sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-WITHOUT_INPUT_HISTORY sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-OUTPUT_STYLE sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-AM_PM_FORMAT sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-VALUE_AS_LITERAL sy-vline 
WA_DDRTOBJCATALOGCOLUMNS_STR-COLUMN_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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