ABAP Select data from SAP table TDWI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDWI
*  INTO TABLE @DATA(IT_TDWI2).
*--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_TDWI INDEX 1 INTO DATA(WA_TDWI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDWI>-MANDT = 1.
<TDWI>-DOC_IAC_GROUP = 1.
<TDWI>-DOKAR = 1.
<TDWI>-DOKTL_SEL = 1.
<TDWI>-DOKVR_SEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDWI-DWNAM_SEL, sy-vline,
  WA_TDWI-AENNR_SEL, sy-vline,
  WA_TDWI-LABOR_SEL, sy-vline,
  WA_TDWI-DTTRG_SEL, sy-vline,
  WA_TDWI-DAPPL_SEL, sy-vline,
  WA_TDWI-DOKST_SEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TDWI 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_TDWI 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_TDWI INTO WA_TDWI.


*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 AENNR_DEF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TDWI-AENNR_DEF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDWI-AENNR_DEF.
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_TDWI_STR, 
MANDT TYPE STRING,
DOC_IAC_GROUP TYPE STRING,
DOKAR TYPE STRING,
DOKTL_SEL TYPE STRING,
DOKVR_SEL TYPE STRING,
DWNAM_SEL TYPE STRING,
AENNR_SEL TYPE STRING,
LABOR_SEL TYPE STRING,
DTTRG_SEL TYPE STRING,
DAPPL_SEL TYPE STRING,
DOKST_SEL TYPE STRING,
DKTXT_DISP TYPE STRING,
DOKTL_DISP TYPE STRING,
DOKVR_DISP TYPE STRING,
DWNAM_DISP TYPE STRING,
AENNR_DISP TYPE STRING,
LABOR_DISP TYPE STRING,
DOKST_DISP TYPE STRING,
ORIG1_DISP TYPE STRING,
ORIG2_DISP TYPE STRING,
DOKAR_DISP TYPE STRING,
AENNR_DEF TYPE STRING,
DAPPL_DEF TYPE STRING,
DOKST_DEF TYPE STRING,
DOKTL_DEF TYPE STRING,
DOKVR_DEF TYPE STRING,
DTTRG_DEF TYPE STRING,
DWNAM_DEF TYPE STRING,
LABOR_DEF TYPE STRING,
DISP_APPL1 TYPE STRING,
DISP_APPL2 TYPE STRING,
DISP_APPL3 TYPE STRING,
DOKXTL_SEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDWI_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_TDWI_STR-MANDT sy-vline 
WA_TDWI_STR-DOC_IAC_GROUP sy-vline 
WA_TDWI_STR-DOKAR sy-vline 
WA_TDWI_STR-DOKTL_SEL sy-vline 
WA_TDWI_STR-DOKVR_SEL sy-vline 
WA_TDWI_STR-DWNAM_SEL sy-vline 
WA_TDWI_STR-AENNR_SEL sy-vline 
WA_TDWI_STR-LABOR_SEL sy-vline 
WA_TDWI_STR-DTTRG_SEL sy-vline 
WA_TDWI_STR-DAPPL_SEL sy-vline 
WA_TDWI_STR-DOKST_SEL sy-vline 
WA_TDWI_STR-DKTXT_DISP sy-vline 
WA_TDWI_STR-DOKTL_DISP sy-vline 
WA_TDWI_STR-DOKVR_DISP sy-vline 
WA_TDWI_STR-DWNAM_DISP sy-vline 
WA_TDWI_STR-AENNR_DISP sy-vline 
WA_TDWI_STR-LABOR_DISP sy-vline 
WA_TDWI_STR-DOKST_DISP sy-vline 
WA_TDWI_STR-ORIG1_DISP sy-vline 
WA_TDWI_STR-ORIG2_DISP sy-vline 
WA_TDWI_STR-DOKAR_DISP sy-vline 
WA_TDWI_STR-AENNR_DEF sy-vline 
WA_TDWI_STR-DAPPL_DEF sy-vline 
WA_TDWI_STR-DOKST_DEF sy-vline 
WA_TDWI_STR-DOKTL_DEF sy-vline 
WA_TDWI_STR-DOKVR_DEF sy-vline 
WA_TDWI_STR-DTTRG_DEF sy-vline 
WA_TDWI_STR-DWNAM_DEF sy-vline 
WA_TDWI_STR-LABOR_DEF sy-vline 
WA_TDWI_STR-DISP_APPL1 sy-vline 
WA_TDWI_STR-DISP_APPL2 sy-vline 
WA_TDWI_STR-DISP_APPL3 sy-vline 
WA_TDWI_STR-DOKXTL_SEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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