ABAP Select data from SAP table DDCDS_SELECTLIST_EXT_STR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDCDS_SELECTLIST_EXT_STR
*  INTO TABLE @DATA(IT_DDCDS_SELECTLIST_EXT_STR2).
*--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_DDCDS_SELECTLIST_EXT_STR INDEX 1 INTO DATA(WA_DDCDS_SELECTLIST_EXT_STR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDCDS_SELECTLIST_EXT_STR>-ENTITY_NAME = 1.
<DDCDS_SELECTLIST_EXT_STR>-UNION_NUMBER = 1.
<DDCDS_SELECTLIST_EXT_STR>-ELEMENT_ALIAS = 1.
<DDCDS_SELECTLIST_EXT_STR>-ELEMENT_POS = 1.
<DDCDS_SELECTLIST_EXT_STR>-STACK_LINE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDCDS_SELECTLIST_EXT_STR-AS4LOCAL, sy-vline,
  WA_DDCDS_SELECTLIST_EXT_STR-EXPR_TYPE, sy-vline,
  WA_DDCDS_SELECTLIST_EXT_STR-EXPR_SUBTYPE, sy-vline,
  WA_DDCDS_SELECTLIST_EXT_STR-EXPR_PARAM_COUNT, sy-vline,
  WA_DDCDS_SELECTLIST_EXT_STR-BASE_OBJ_ALIAS, sy-vline,
  WA_DDCDS_SELECTLIST_EXT_STR-BASE_OBJ_NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDCDS_SELECTLIST_EXT_STR 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_DDCDS_SELECTLIST_EXT_STR 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_DDCDS_SELECTLIST_EXT_STR INTO WA_DDCDS_SELECTLIST_EXT_STR.


*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_DDCDS_SELECTLIST_EXT_STR-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DDCDS_SELECTLIST_EXT_STR-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_DDCDS_SELECTLIST_EXT_STR_STR, 
ENTITY_NAME TYPE STRING,
UNION_NUMBER TYPE STRING,
ELEMENT_ALIAS TYPE STRING,
ELEMENT_POS TYPE STRING,
STACK_LINE TYPE STRING,
AS4LOCAL TYPE STRING,
EXPR_TYPE TYPE STRING,
EXPR_SUBTYPE TYPE STRING,
EXPR_PARAM_COUNT TYPE STRING,
BASE_OBJ_ALIAS TYPE STRING,
BASE_OBJ_NAME TYPE STRING,
BASE_OBJ_TYPE TYPE STRING,
BASE_ELEMENT_NAME TYPE STRING,
BASE_ELEMENT_NAME_RAW TYPE STRING,
FUNCTION_NAME TYPE STRING,
IS_TYPE_PRESERVING TYPE STRING,
OPERATOR TYPE STRING,
LITERAL_VALUE TYPE STRING,
PARAMETER_NAME TYPE STRING,
SESSION_VAR_EXPR TYPE STRING,
DATA_ELEMENT TYPE STRING,
KEYFLAG TYPE STRING,
IS_VIRTUAL TYPE STRING,
IS_GENERATED TYPE STRING,
IS_GENERATED_LOCALIZED TYPE STRING,
ASSOC_NAME TYPE STRING,
ASSOC_BASE_TYPE TYPE STRING,
DATATYPE TYPE STRING,
LENGTH TYPE STRING,
DECIMALS TYPE STRING,
ANNO_NAME TYPE STRING,
ANNO_QUALIFIER TYPE STRING,
ANNO_VALUE TYPE STRING,
ANNO_VALUE_UNESCAPED TYPE STRING,
ANNO_TYPE TYPE STRING,
IS_PATH_FIELD TYPE STRING,
START_LINE TYPE STRING,
START_COLUMN TYPE STRING,
START_DDLNAME TYPE STRING,
END_LINE TYPE STRING,
END_COLUMN TYPE STRING,
END_DDLNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDCDS_SELECTLIST_EXT_STR_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_DDCDS_SELECTLIST_EXT_STR_STR-ENTITY_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-UNION_NUMBER sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ELEMENT_ALIAS sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ELEMENT_POS sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-STACK_LINE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-AS4LOCAL sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-EXPR_TYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-EXPR_SUBTYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-EXPR_PARAM_COUNT sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-BASE_OBJ_ALIAS sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-BASE_OBJ_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-BASE_OBJ_TYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-BASE_ELEMENT_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-BASE_ELEMENT_NAME_RAW sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-FUNCTION_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-IS_TYPE_PRESERVING sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-OPERATOR sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-LITERAL_VALUE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-PARAMETER_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-SESSION_VAR_EXPR sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-DATA_ELEMENT sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-KEYFLAG sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-IS_VIRTUAL sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-IS_GENERATED sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-IS_GENERATED_LOCALIZED sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ASSOC_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ASSOC_BASE_TYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-DATATYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-LENGTH sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-DECIMALS sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ANNO_NAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ANNO_QUALIFIER sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ANNO_VALUE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ANNO_VALUE_UNESCAPED sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-ANNO_TYPE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-IS_PATH_FIELD sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-START_LINE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-START_COLUMN sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-START_DDLNAME sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-END_LINE sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-END_COLUMN sy-vline 
WA_DDCDS_SELECTLIST_EXT_STR_STR-END_DDLNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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