ABAP Select data from SAP table TDWA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDWA
*  INTO TABLE @DATA(IT_TDWA2).
*--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_TDWA INDEX 1 INTO DATA(WA_TDWA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDWA>-MANDT = 1.
<TDWA>-DOKAR = 1.
<TDWA>-FLDSL = 1.
<TDWA>-STAEN = 1.
<TDWA>-PROJB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDWA-ALPHN, sy-vline,
  WA_TDWA-VERVG, sy-vline,
  WA_TDWA-NUMVG, sy-vline,
  WA_TDWA-INUMNR, sy-vline,
  WA_TDWA-ENUMNR, sy-vline,
  WA_TDWA-AENBL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TDWA 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_TDWA 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_TDWA INTO WA_TDWA.


*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 ALPHA, internal->external for field FILELEN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TDWA-FILELEN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDWA-FILELEN.
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_TDWA_STR, 
MANDT TYPE STRING,
DOKAR TYPE STRING,
FLDSL TYPE STRING,
STAEN TYPE STRING,
PROJB TYPE STRING,
ALPHN TYPE STRING,
VERVG TYPE STRING,
NUMVG TYPE STRING,
INUMNR TYPE STRING,
ENUMNR TYPE STRING,
AENBL TYPE STRING,
ARCHF TYPE STRING,
ALTDY TYPE STRING,
ADYPROG TYPE STRING,
ZNRPROG TYPE STRING,
FHMDK TYPE STRING,
FILELEN TYPE STRING,
KLASSE TYPE STRING,
KLASSENART TYPE STRING,
ORIG_DEL TYPE STRING,
ORIG_DSTRB TYPE STRING,
KPRO_USE TYPE STRING,
CLASS_INCLUDE TYPE STRING,
DEF_APPLICATION TYPE STRING,
DIST_APPLICATION TYPE STRING,
NEW_VERS_IGNORE TYPE STRING,
CM_RELEVANCE TYPE STRING,
DOKVR_INC TYPE STRING,
ACM_USE TYPE STRING,
ACM_ENABLE_OBJEC TYPE STRING,
DS_USE TYPE STRING,
ISRESTRICEDTOONEMAINFILE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDWA_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_TDWA_STR-MANDT sy-vline 
WA_TDWA_STR-DOKAR sy-vline 
WA_TDWA_STR-FLDSL sy-vline 
WA_TDWA_STR-STAEN sy-vline 
WA_TDWA_STR-PROJB sy-vline 
WA_TDWA_STR-ALPHN sy-vline 
WA_TDWA_STR-VERVG sy-vline 
WA_TDWA_STR-NUMVG sy-vline 
WA_TDWA_STR-INUMNR sy-vline 
WA_TDWA_STR-ENUMNR sy-vline 
WA_TDWA_STR-AENBL sy-vline 
WA_TDWA_STR-ARCHF sy-vline 
WA_TDWA_STR-ALTDY sy-vline 
WA_TDWA_STR-ADYPROG sy-vline 
WA_TDWA_STR-ZNRPROG sy-vline 
WA_TDWA_STR-FHMDK sy-vline 
WA_TDWA_STR-FILELEN sy-vline 
WA_TDWA_STR-KLASSE sy-vline 
WA_TDWA_STR-KLASSENART sy-vline 
WA_TDWA_STR-ORIG_DEL sy-vline 
WA_TDWA_STR-ORIG_DSTRB sy-vline 
WA_TDWA_STR-KPRO_USE sy-vline 
WA_TDWA_STR-CLASS_INCLUDE sy-vline 
WA_TDWA_STR-DEF_APPLICATION sy-vline 
WA_TDWA_STR-DIST_APPLICATION sy-vline 
WA_TDWA_STR-NEW_VERS_IGNORE sy-vline 
WA_TDWA_STR-CM_RELEVANCE sy-vline 
WA_TDWA_STR-DOKVR_INC sy-vline 
WA_TDWA_STR-ACM_USE sy-vline 
WA_TDWA_STR-ACM_ENABLE_OBJEC sy-vline 
WA_TDWA_STR-DS_USE sy-vline 
WA_TDWA_STR-ISRESTRICEDTOONEMAINFILE sy-vline      INTO ld_text SEPARATED BY SPACE.

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