ABAP Select data from SAP table LISTDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LISTDS
*  INTO TABLE @DATA(IT_LISTDS2).
*--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_LISTDS INDEX 1 INTO DATA(WA_LISTDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LISTDS>-LPIND = 1.
<LISTDS>-LSIND = 1.
<LISTDS>-CPAGE = 1.
<LISTDS>-STARO = 1.
<LISTDS>-STACO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LISTDS-WINX1, sy-vline,
  WA_LISTDS-WINX2, sy-vline,
  WA_LISTDS-WINY1, sy-vline,
  WA_LISTDS-WINY2, sy-vline,
  WA_LISTDS-FILL1, sy-vline,
  WA_LISTDS-FILL2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LISTDS 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_LISTDS 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_LISTDS INTO WA_LISTDS.


*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_LISTDS_STR, 
LPIND TYPE STRING,
LSIND TYPE STRING,
CPAGE TYPE STRING,
STARO TYPE STRING,
STACO TYPE STRING,
WINX1 TYPE STRING,
WINX2 TYPE STRING,
WINY1 TYPE STRING,
WINY2 TYPE STRING,
FILL1 TYPE STRING,
FILL2 TYPE STRING,
FILL3 TYPE STRING,
LISTTAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LISTDS_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_LISTDS_STR-LPIND sy-vline 
WA_LISTDS_STR-LSIND sy-vline 
WA_LISTDS_STR-CPAGE sy-vline 
WA_LISTDS_STR-STARO sy-vline 
WA_LISTDS_STR-STACO sy-vline 
WA_LISTDS_STR-WINX1 sy-vline 
WA_LISTDS_STR-WINX2 sy-vline 
WA_LISTDS_STR-WINY1 sy-vline 
WA_LISTDS_STR-WINY2 sy-vline 
WA_LISTDS_STR-FILL1 sy-vline 
WA_LISTDS_STR-FILL2 sy-vline 
WA_LISTDS_STR-FILL3 sy-vline 
WA_LISTDS_STR-LISTTAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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