ABAP Select data from SAP table DTAXNL1A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DTAXNL1A 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 DTAXNL1A. 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 DTAXNL1A 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_DTAXNL1A TYPE STANDARD TABLE OF DTAXNL1A,
      WA_DTAXNL1A TYPE DTAXNL1A,
      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: <DTAXNL1A> TYPE DTAXNL1A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DTAXNL1A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DTAXNL1A
  INTO TABLE IT_DTAXNL1A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAXNL1A
*  INTO TABLE @DATA(IT_DTAXNL1A2).
*--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_DTAXNL1A INDEX 1 INTO DATA(WA_DTAXNL1A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DTAXNL1A ASSIGNING <DTAXNL1A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAXNL1A>-RECCD = 1.
<DTAXNL1A>-DEVBK = 1.
<DTAXNL1A>-MEDCD = 1.
<DTAXNL1A>-VRSNU = 1.
<DTAXNL1A>-DATCB = 1.

ENDLOOP.

LOOP AT IT_DTAXNL1A INTO WA_DTAXNL1A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAXNL1A-BATNR, sy-vline,
  WA_DTAXNL1A-AUFNA, sy-vline,
  WA_DTAXNL1A-AUFAD, sy-vline,
  WA_DTAXNL1A-AUFOR, sy-vline,
  WA_DTAXNL1A-AUFLA, sy-vline,
  WA_DTAXNL1A-BEDTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAXNL1A 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_DTAXNL1A 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_DTAXNL1A INTO WA_DTAXNL1A.


*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_DTAXNL1A_STR, 
RECCD TYPE STRING,
DEVBK TYPE STRING,
MEDCD TYPE STRING,
VRSNU TYPE STRING,
DATCB TYPE STRING,
BATNR TYPE STRING,
AUFNA TYPE STRING,
AUFAD TYPE STRING,
AUFOR TYPE STRING,
AUFLA TYPE STRING,
BEDTA TYPE STRING,
GEWDT TYPE STRING,
RESERVE20 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAXNL1A_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_DTAXNL1A_STR-RECCD sy-vline 
WA_DTAXNL1A_STR-DEVBK sy-vline 
WA_DTAXNL1A_STR-MEDCD sy-vline 
WA_DTAXNL1A_STR-VRSNU sy-vline 
WA_DTAXNL1A_STR-DATCB sy-vline 
WA_DTAXNL1A_STR-BATNR sy-vline 
WA_DTAXNL1A_STR-AUFNA sy-vline 
WA_DTAXNL1A_STR-AUFAD sy-vline 
WA_DTAXNL1A_STR-AUFOR sy-vline 
WA_DTAXNL1A_STR-AUFLA sy-vline 
WA_DTAXNL1A_STR-BEDTA sy-vline 
WA_DTAXNL1A_STR-GEWDT sy-vline 
WA_DTAXNL1A_STR-RESERVE20 sy-vline      INTO ld_text SEPARATED BY SPACE.

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