ABAP Select data from SAP table DD23L into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD23L 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 DD23L. 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 DD23L 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_DD23L TYPE STANDARD TABLE OF DD23L,
      WA_DD23L TYPE DD23L,
      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: <DD23L> TYPE DD23L.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD23L.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD23L
  INTO TABLE IT_DD23L.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD23L
*  INTO TABLE @DATA(IT_DD23L2).
*--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_DD23L INDEX 1 INTO DATA(WA_DD23L2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD23L ASSIGNING <DD23L>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD23L>-MCONAME = 1.
<DD23L>-MCID = 1.
<DD23L>-AS4LOCAL = 1.
<DD23L>-AS4VERS = 1.
<DD23L>-APPLCLASS = 1.

ENDLOOP.

LOOP AT IT_DD23L INTO WA_DD23L.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD23L-AUTHCLASS, sy-vline,
  WA_DD23L-MAINT, sy-vline,
  WA_DD23L-SECINDEX, sy-vline,
  WA_DD23L-ENDUSER, sy-vline,
  WA_DD23L-DELFLAG, sy-vline,
  WA_DD23L-POOLTAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD23L 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_DD23L 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_DD23L INTO WA_DD23L.


*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 ISOLA, internal->external for field MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DD23L-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD23L-MASTERLANG.
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_DD23L_STR, 
MCONAME TYPE STRING,
MCID TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
MAINT TYPE STRING,
SECINDEX TYPE STRING,
ENDUSER TYPE STRING,
DELFLAG TYPE STRING,
POOLTAB TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
ACTFLAG TYPE STRING,
MASTERLANG TYPE STRING,
FUNCNAME TYPE STRING,
FLAGS TYPE STRING,
INDTABNAME TYPE STRING,
INDNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD23L_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_DD23L_STR-MCONAME sy-vline 
WA_DD23L_STR-MCID sy-vline 
WA_DD23L_STR-AS4LOCAL sy-vline 
WA_DD23L_STR-AS4VERS sy-vline 
WA_DD23L_STR-APPLCLASS sy-vline 
WA_DD23L_STR-AUTHCLASS sy-vline 
WA_DD23L_STR-MAINT sy-vline 
WA_DD23L_STR-SECINDEX sy-vline 
WA_DD23L_STR-ENDUSER sy-vline 
WA_DD23L_STR-DELFLAG sy-vline 
WA_DD23L_STR-POOLTAB sy-vline 
WA_DD23L_STR-AS4USER sy-vline 
WA_DD23L_STR-AS4DATE sy-vline 
WA_DD23L_STR-AS4TIME sy-vline 
WA_DD23L_STR-ACTFLAG sy-vline 
WA_DD23L_STR-MASTERLANG sy-vline 
WA_DD23L_STR-FUNCNAME sy-vline 
WA_DD23L_STR-FLAGS sy-vline 
WA_DD23L_STR-INDTABNAME sy-vline 
WA_DD23L_STR-INDNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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