ABAP Select data from SAP table DWN01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DWN01 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 DWN01. 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 DWN01 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_DWN01 TYPE STANDARD TABLE OF DWN01,
      WA_DWN01 TYPE DWN01,
      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: <DWN01> TYPE DWN01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DWN01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DWN01
  INTO TABLE IT_DWN01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DWN01
*  INTO TABLE @DATA(IT_DWN012).
*--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_DWN01 INDEX 1 INTO DATA(WA_DWN012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DWN01 ASSIGNING <DWN01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DWN01>-ZAUSW = 1.
<DWN01>-BEGDA = 1.
<DWN01>-ENDDA = 1.
<DWN01>-ZAUVE = 1.
<DWN01>-PERNR = 1.

ENDLOOP.

LOOP AT IT_DWN01 INTO WA_DWN01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DWN01-ENAME, sy-vline,
  WA_DWN01-SNAME, sy-vline,
  WA_DWN01-INFO1, sy-vline,
  WA_DWN01-INFO2, sy-vline,
  WA_DWN01-INFO3, sy-vline,
  WA_DWN01-INFO4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DWN01 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_DWN01 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_DWN01 INTO WA_DWN01.


*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_DWN01_STR, 
ZAUSW TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
ZAUVE TYPE STRING,
PERNR TYPE STRING,
ENAME TYPE STRING,
SNAME TYPE STRING,
INFO1 TYPE STRING,
INFO2 TYPE STRING,
INFO3 TYPE STRING,
INFO4 TYPE STRING,
INFO5 TYPE STRING,
INFO6 TYPE STRING,
INFO7 TYPE STRING,
INFO8 TYPE STRING,
INFO9 TYPE STRING,
INFOA TYPE STRING,
IMAIL TYPE STRING,
MOABW TYPE STRING,
MOLGA TYPE STRING,
BDEGR TYPE STRING,
ZEITY TYPE STRING,
ZDGBE TYPE STRING,
ZANBE TYPE STRING,
ZPINC TYPE STRING,
ZMAIL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DWN01_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_DWN01_STR-ZAUSW sy-vline 
WA_DWN01_STR-BEGDA sy-vline 
WA_DWN01_STR-ENDDA sy-vline 
WA_DWN01_STR-ZAUVE sy-vline 
WA_DWN01_STR-PERNR sy-vline 
WA_DWN01_STR-ENAME sy-vline 
WA_DWN01_STR-SNAME sy-vline 
WA_DWN01_STR-INFO1 sy-vline 
WA_DWN01_STR-INFO2 sy-vline 
WA_DWN01_STR-INFO3 sy-vline 
WA_DWN01_STR-INFO4 sy-vline 
WA_DWN01_STR-INFO5 sy-vline 
WA_DWN01_STR-INFO6 sy-vline 
WA_DWN01_STR-INFO7 sy-vline 
WA_DWN01_STR-INFO8 sy-vline 
WA_DWN01_STR-INFO9 sy-vline 
WA_DWN01_STR-INFOA sy-vline 
WA_DWN01_STR-IMAIL sy-vline 
WA_DWN01_STR-MOABW sy-vline 
WA_DWN01_STR-MOLGA sy-vline 
WA_DWN01_STR-BDEGR sy-vline 
WA_DWN01_STR-ZEITY sy-vline 
WA_DWN01_STR-ZDGBE sy-vline 
WA_DWN01_STR-ZANBE sy-vline 
WA_DWN01_STR-ZPINC sy-vline 
WA_DWN01_STR-ZMAIL sy-vline      INTO ld_text SEPARATED BY SPACE.

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