ABAP Select data from SAP table LIST_DLF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIST_DLF
*  INTO TABLE @DATA(IT_LIST_DLF2).
*--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_LIST_DLF INDEX 1 INTO DATA(WA_LIST_DLF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIST_DLF>-VIEWNAME = 1.
<LIST_DLF>-OBJ_NAME = 1.
<LIST_DLF>-VIEWFIELD = 1.
<LIST_DLF>-AS4LOCAL = 1.
<LIST_DLF>-TEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIST_DLF-TEXT2X, sy-vline,
  WA_LIST_DLF-DEVCLASS, sy-vline,
  WA_LIST_DLF-AS4USER, sy-vline,
  WA_LIST_DLF-AS4DATE, sy-vline,
  WA_LIST_DLF-VIEWCLASS, sy-vline,
  WA_LIST_DLF-AGGTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIST_DLF 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_LIST_DLF 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_LIST_DLF INTO WA_LIST_DLF.


*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_LIST_DLF-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_DLF-DATATYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_LIST_DLF-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_DLF-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_LIST_DLF_STR, 
VIEWNAME TYPE STRING,
OBJ_NAME TYPE STRING,
VIEWFIELD TYPE STRING,
AS4LOCAL TYPE STRING,
TEXT TYPE STRING,
TEXT2X TYPE STRING,
DEVCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
VIEWCLASS TYPE STRING,
AGGTYPE TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
ROLLNAME TYPE STRING,
ROLLCHANGE TYPE STRING,
DOMNAME TYPE STRING,
KEYFLAG TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
CHECKTABLE TYPE STRING,
VALEXI TYPE STRING,
ROOTTAB TYPE STRING,
REFFIELD TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
ROUTPUTLEN TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
MASTERLANG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIST_DLF_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_LIST_DLF_STR-VIEWNAME sy-vline 
WA_LIST_DLF_STR-OBJ_NAME sy-vline 
WA_LIST_DLF_STR-VIEWFIELD sy-vline 
WA_LIST_DLF_STR-AS4LOCAL sy-vline 
WA_LIST_DLF_STR-TEXT sy-vline 
WA_LIST_DLF_STR-TEXT2X sy-vline 
WA_LIST_DLF_STR-DEVCLASS sy-vline 
WA_LIST_DLF_STR-AS4USER sy-vline 
WA_LIST_DLF_STR-AS4DATE sy-vline 
WA_LIST_DLF_STR-VIEWCLASS sy-vline 
WA_LIST_DLF_STR-AGGTYPE sy-vline 
WA_LIST_DLF_STR-TABNAME sy-vline 
WA_LIST_DLF_STR-FIELDNAME sy-vline 
WA_LIST_DLF_STR-ROLLNAME sy-vline 
WA_LIST_DLF_STR-ROLLCHANGE sy-vline 
WA_LIST_DLF_STR-DOMNAME sy-vline 
WA_LIST_DLF_STR-KEYFLAG sy-vline 
WA_LIST_DLF_STR-MEMORYID sy-vline 
WA_LIST_DLF_STR-LOGFLAG sy-vline 
WA_LIST_DLF_STR-CHECKTABLE sy-vline 
WA_LIST_DLF_STR-VALEXI sy-vline 
WA_LIST_DLF_STR-ROOTTAB sy-vline 
WA_LIST_DLF_STR-REFFIELD sy-vline 
WA_LIST_DLF_STR-DATATYPE sy-vline 
WA_LIST_DLF_STR-LENG sy-vline 
WA_LIST_DLF_STR-ROUTPUTLEN sy-vline 
WA_LIST_DLF_STR-REPTEXT sy-vline 
WA_LIST_DLF_STR-SCRTEXT_S sy-vline 
WA_LIST_DLF_STR-SCRTEXT_M sy-vline 
WA_LIST_DLF_STR-SCRTEXT_L sy-vline 
WA_LIST_DLF_STR-MASTERLANG sy-vline      INTO ld_text SEPARATED BY SPACE.

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