ABAP Select data from SAP table MMIV_SI_S_TAX_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMIV_SI_S_TAX_DATA
*  INTO TABLE @DATA(IT_MMIV_SI_S_TAX_DATA2).
*--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_MMIV_SI_S_TAX_DATA INDEX 1 INTO DATA(WA_MMIV_SI_S_TAX_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMIV_SI_S_TAX_DATA>-MWSKZ = 1.
<MMIV_SI_S_TAX_DATA>-SHKZG = 1.
<MMIV_SI_S_TAX_DATA>-BUZEI = 1.
<MMIV_SI_S_TAX_DATA>-WMWST = 1.
<MMIV_SI_S_TAX_DATA>-ARKUEN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMIV_SI_S_TAX_DATA-ARKUEMW, sy-vline,
  WA_MMIV_SI_S_TAX_DATA-FWBAS, sy-vline,
  WA_MMIV_SI_S_TAX_DATA-HWSTE, sy-vline,
  WA_MMIV_SI_S_TAX_DATA-HWBAS, sy-vline,
  WA_MMIV_SI_S_TAX_DATA-TXMOD, sy-vline,
  WA_MMIV_SI_S_TAX_DATA-TXJCD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMIV_SI_S_TAX_DATA 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_MMIV_SI_S_TAX_DATA 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_MMIV_SI_S_TAX_DATA INTO WA_MMIV_SI_S_TAX_DATA.


*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_MMIV_SI_S_TAX_DATA_STR, 
MWSKZ TYPE STRING,
SHKZG TYPE STRING,
BUZEI TYPE STRING,
WMWST TYPE STRING,
ARKUEN TYPE STRING,
ARKUEMW TYPE STRING,
FWBAS TYPE STRING,
HWSTE TYPE STRING,
HWBAS TYPE STRING,
TXMOD TYPE STRING,
TXJCD TYPE STRING,
TXJDP TYPE STRING,
KSCHL TYPE STRING,
TAXPS TYPE STRING,
TXDAT TYPE STRING,
TXDAT_FROM TYPE STRING,
TAX_COUNTRY TYPE STRING,
UX_FC_MWSKZ TYPE STRING,
UX_FC_WMWST TYPE STRING,
UX_FC_FWBAS TYPE STRING,
UX_FC_TXJCD TYPE STRING,
UX_FC_HWBAS TYPE STRING,
UX_FC_HWSTE TYPE STRING,
UX_FC_TAX_COUNTRY TYPE STRING,
UX_FC_SHKZG TYPE STRING,
UX_DELETE TYPE STRING,
CREA_DATE_TIME TYPE STRING,
CREA_UNAME TYPE STRING,
LCHG_DATE_TIME TYPE STRING,
LCHG_UNAME TYPE STRING,
HWSTE_ENTERED TYPE STRING,
HWBAS_ENTERED TYPE STRING,
TAX_BASE_ENTERED TYPE STRING,
TAXCODE_TXT TYPE STRING,
TAXITEM_IS_FROM_EXTERNAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMIV_SI_S_TAX_DATA_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_MMIV_SI_S_TAX_DATA_STR-MWSKZ sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-SHKZG sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-BUZEI sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-WMWST sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-ARKUEN sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-ARKUEMW sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-FWBAS sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-HWSTE sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-HWBAS sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TXMOD sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TXJCD sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TXJDP sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-KSCHL sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TAXPS sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TXDAT sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TXDAT_FROM sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TAX_COUNTRY sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_MWSKZ sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_WMWST sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_FWBAS sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_TXJCD sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_HWBAS sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_HWSTE sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_TAX_COUNTRY sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_FC_SHKZG sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-UX_DELETE sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-CREA_DATE_TIME sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-CREA_UNAME sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-LCHG_DATE_TIME sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-LCHG_UNAME sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-HWSTE_ENTERED sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-HWBAS_ENTERED sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TAX_BASE_ENTERED sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TAXCODE_TXT sy-vline 
WA_MMIV_SI_S_TAX_DATA_STR-TAXITEM_IS_FROM_EXTERNAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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