ABAP Select data from SAP table QDWL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QDWL
*  INTO TABLE @DATA(IT_QDWL2).
*--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_QDWL INDEX 1 INTO DATA(WA_QDWL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QDWL>-AENDERKZ = 1.
<QDWL>-TXTAENDAUT = 1.
<QDWL>-TXTAENDMAN = 1.
<QDWL>-FLAG = 1.
<QDWL>-KZFELDST02 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QDWL-KZJANEIN, sy-vline,
  WA_QDWL-TXTMAT, sy-vline,
  WA_QDWL-TXTLIEF, sy-vline,
  WA_QDWL-TXTHERST, sy-vline,
  WA_QDWL-TXTKUNDE, sy-vline,
  WA_QDWL-TXTPLAN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QDWL 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_QDWL 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_QDWL INTO WA_QDWL.


*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_QDWL_STR, 
AENDERKZ TYPE STRING,
TXTAENDAUT TYPE STRING,
TXTAENDMAN TYPE STRING,
FLAG TYPE STRING,
KZFELDST02 TYPE STRING,
KZJANEIN TYPE STRING,
TXTMAT TYPE STRING,
TXTLIEF TYPE STRING,
TXTHERST TYPE STRING,
TXTKUNDE TYPE STRING,
TXTPLAN TYPE STRING,
TXTDYNR TYPE STRING,
TXTSTNAE TYPE STRING,
TXTVEBW TYPE STRING,
TXTDYNBW TYPE STRING,
TXTPART TYPE STRING,
KZFWQLMAT TYPE STRING,
KZFWQLLIF TYPE STRING,
KZFWQLHER TYPE STRING,
KZFWQLKUN TYPE STRING,
TXTDYNE TYPE STRING,
TXTMERK30 TYPE STRING,
TXTMERK TYPE STRING,
TXTSTN30 TYPE STRING,
SEL_FLG TYPE STRING,
KZSKIPLOT TYPE STRING,
KZDYNAUT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QDWL_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_QDWL_STR-AENDERKZ sy-vline 
WA_QDWL_STR-TXTAENDAUT sy-vline 
WA_QDWL_STR-TXTAENDMAN sy-vline 
WA_QDWL_STR-FLAG sy-vline 
WA_QDWL_STR-KZFELDST02 sy-vline 
WA_QDWL_STR-KZJANEIN sy-vline 
WA_QDWL_STR-TXTMAT sy-vline 
WA_QDWL_STR-TXTLIEF sy-vline 
WA_QDWL_STR-TXTHERST sy-vline 
WA_QDWL_STR-TXTKUNDE sy-vline 
WA_QDWL_STR-TXTPLAN sy-vline 
WA_QDWL_STR-TXTDYNR sy-vline 
WA_QDWL_STR-TXTSTNAE sy-vline 
WA_QDWL_STR-TXTVEBW sy-vline 
WA_QDWL_STR-TXTDYNBW sy-vline 
WA_QDWL_STR-TXTPART sy-vline 
WA_QDWL_STR-KZFWQLMAT sy-vline 
WA_QDWL_STR-KZFWQLLIF sy-vline 
WA_QDWL_STR-KZFWQLHER sy-vline 
WA_QDWL_STR-KZFWQLKUN sy-vline 
WA_QDWL_STR-TXTDYNE sy-vline 
WA_QDWL_STR-TXTMERK30 sy-vline 
WA_QDWL_STR-TXTMERK sy-vline 
WA_QDWL_STR-TXTSTN30 sy-vline 
WA_QDWL_STR-SEL_FLG sy-vline 
WA_QDWL_STR-KZSKIPLOT sy-vline 
WA_QDWL_STR-KZDYNAUT sy-vline      INTO ld_text SEPARATED BY SPACE.

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