ABAP Select data from SAP table DTAXATI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAXATI
*  INTO TABLE @DATA(IT_DTAXATI2).
*--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_DTAXATI INDEX 1 INTO DATA(WA_DTAXATI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAXATI>-FELD001 = 1.
<DTAXATI>-FELD002 = 1.
<DTAXATI>-FELD003 = 1.
<DTAXATI>-FELD004 = 1.
<DTAXATI>-FELD005 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAXATI-FELD006, sy-vline,
  WA_DTAXATI-FELD007, sy-vline,
  WA_DTAXATI-FELD008, sy-vline,
  WA_DTAXATI-FELD009, sy-vline,
  WA_DTAXATI-FELD010, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_DTAXATI 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_DTAXATI 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_DTAXATI INTO WA_DTAXATI.


*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_DTAXATI_STR, 
FELD001 TYPE STRING,
FELD002 TYPE STRING,
FELD003 TYPE STRING,
FELD004 TYPE STRING,
FELD005 TYPE STRING,
FELD006 TYPE STRING,
FELD007 TYPE STRING,
FELD008 TYPE STRING,
FELD009 TYPE STRING,
FELD010 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAXATI_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_DTAXATI_STR-FELD001 sy-vline 
WA_DTAXATI_STR-FELD002 sy-vline 
WA_DTAXATI_STR-FELD003 sy-vline 
WA_DTAXATI_STR-FELD004 sy-vline 
WA_DTAXATI_STR-FELD005 sy-vline 
WA_DTAXATI_STR-FELD006 sy-vline 
WA_DTAXATI_STR-FELD007 sy-vline 
WA_DTAXATI_STR-FELD008 sy-vline 
WA_DTAXATI_STR-FELD009 sy-vline 
WA_DTAXATI_STR-FELD010 sy-vline      INTO ld_text SEPARATED BY SPACE.

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