ABAP Select data from SAP table BTXTAX into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BTXTAX 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 BTXTAX. 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 BTXTAX 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_BTXTAX TYPE STANDARD TABLE OF BTXTAX,
      WA_BTXTAX TYPE BTXTAX,
      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: <BTXTAX> TYPE BTXTAX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BTXTAX
*  INTO TABLE @DATA(IT_BTXTAX2).
*--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_BTXTAX INDEX 1 INTO DATA(WA_BTXTAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BTXTAX>-BSIAUTH = 1.
<BTXTAX>-TAXTYPE = 1.
<BTXTAX>-EFFECTIVE = 1.
<BTXTAX>-RESCIND = 1.
<BTXTAX>-COTERM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BTXTAX-REGULAR, sy-vline,
  WA_BTXTAX-SUPPLEMENT, sy-vline,
  WA_BTXTAX-VACATION, sy-vline,
  WA_BTXTAX-CUMULATIVE, sy-vline,
  WA_BTXTAX-DFACTOR, sy-vline,
  WA_BTXTAX-ADDTAX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BTXTAX 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_BTXTAX 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_BTXTAX INTO WA_BTXTAX.


*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 TXTYP, internal->external for field TAXTYPE
CALL FUNCTION 'CONVERSION_EXIT_TXTYP_OUTPUT'
  EXPORTING
    input =                      WA_BTXTAX-TAXTYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BTXTAX-TAXTYPE.
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_BTXTAX_STR, 
BSIAUTH TYPE STRING,
TAXTYPE TYPE STRING,
EFFECTIVE TYPE STRING,
RESCIND TYPE STRING,
COTERM TYPE STRING,
REGULAR TYPE STRING,
SUPPLEMENT TYPE STRING,
VACATION TYPE STRING,
CUMULATIVE TYPE STRING,
DFACTOR TYPE STRING,
ADDTAX TYPE STRING,
DISPOS TYPE STRING,
MAINTDATE TYPE STRING,
MAINTTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BTXTAX_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_BTXTAX_STR-BSIAUTH sy-vline 
WA_BTXTAX_STR-TAXTYPE sy-vline 
WA_BTXTAX_STR-EFFECTIVE sy-vline 
WA_BTXTAX_STR-RESCIND sy-vline 
WA_BTXTAX_STR-COTERM sy-vline 
WA_BTXTAX_STR-REGULAR sy-vline 
WA_BTXTAX_STR-SUPPLEMENT sy-vline 
WA_BTXTAX_STR-VACATION sy-vline 
WA_BTXTAX_STR-CUMULATIVE sy-vline 
WA_BTXTAX_STR-DFACTOR sy-vline 
WA_BTXTAX_STR-ADDTAX sy-vline 
WA_BTXTAX_STR-DISPOS sy-vline 
WA_BTXTAX_STR-MAINTDATE sy-vline 
WA_BTXTAX_STR-MAINTTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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