ABAP Select data from SAP table FAC_DZCUSTWTAX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FAC_DZCUSTWTAX
*  INTO TABLE @DATA(IT_FAC_DZCUSTWTAX2).
*--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_FAC_DZCUSTWTAX INDEX 1 INTO DATA(WA_FAC_DZCUSTWTAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FAC_DZCUSTWTAX>-MANDT = 1.
<FAC_DZCUSTWTAX>-COMPANYCODE = 1.
<FAC_DZCUSTWTAX>-CUSTOMER = 1.
<FAC_DZCUSTWTAX>-WITHHOLDINGTAXTYPE = 1.
<FAC_DZCUSTWTAX>-BUSINESSPARTNER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FAC_DZCUSTWTAX-SYSTEMCLIENT, sy-vline,
  WA_FAC_DZCUSTWTAX-WITHHOLDINGTAXCERTIFICATE, sy-vline,
  WA_FAC_DZCUSTWTAX-EXEMPTIONDATEBEGIN, sy-vline,
  WA_FAC_DZCUSTWTAX-EXEMPTIONDATEEND, sy-vline,
  WA_FAC_DZCUSTWTAX-WITHHOLDINGTAXCODE, sy-vline,
  WA_FAC_DZCUSTWTAX-COUNTRYCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FAC_DZCUSTWTAX 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_FAC_DZCUSTWTAX 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_FAC_DZCUSTWTAX INTO WA_FAC_DZCUSTWTAX.


*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 CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FAC_DZCUSTWTAX-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FAC_DZCUSTWTAX-CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BUSINESSPARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FAC_DZCUSTWTAX-BUSINESSPARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FAC_DZCUSTWTAX-BUSINESSPARTNER.
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_FAC_DZCUSTWTAX_STR, 
MANDT TYPE STRING,
COMPANYCODE TYPE STRING,
CUSTOMER TYPE STRING,
WITHHOLDINGTAXTYPE TYPE STRING,
BUSINESSPARTNER TYPE STRING,
SYSTEMCLIENT TYPE STRING,
WITHHOLDINGTAXCERTIFICATE TYPE STRING,
EXEMPTIONDATEBEGIN TYPE STRING,
EXEMPTIONDATEEND TYPE STRING,
WITHHOLDINGTAXCODE TYPE STRING,
COUNTRYCODE TYPE STRING,
WITHHOLDINGTAXAGENT TYPE STRING,
OBLIGATIONDATEBEGIN TYPE STRING,
OBLIGATIONDATEEND TYPE STRING,
WITHHOLDINGTAXNUMBER TYPE STRING,
WITHHOLDINGTAXEXMPTPERCENT TYPE STRING,
EXEMPTIONREASON TYPE STRING,
WHLDGTAXCODENAME TYPE STRING,
WITHHOLDINGTAXTYPENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FAC_DZCUSTWTAX_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_FAC_DZCUSTWTAX_STR-MANDT sy-vline 
WA_FAC_DZCUSTWTAX_STR-COMPANYCODE sy-vline 
WA_FAC_DZCUSTWTAX_STR-CUSTOMER sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXTYPE sy-vline 
WA_FAC_DZCUSTWTAX_STR-BUSINESSPARTNER sy-vline 
WA_FAC_DZCUSTWTAX_STR-SYSTEMCLIENT sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXCERTIFICATE sy-vline 
WA_FAC_DZCUSTWTAX_STR-EXEMPTIONDATEBEGIN sy-vline 
WA_FAC_DZCUSTWTAX_STR-EXEMPTIONDATEEND sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXCODE sy-vline 
WA_FAC_DZCUSTWTAX_STR-COUNTRYCODE sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXAGENT sy-vline 
WA_FAC_DZCUSTWTAX_STR-OBLIGATIONDATEBEGIN sy-vline 
WA_FAC_DZCUSTWTAX_STR-OBLIGATIONDATEEND sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXNUMBER sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXEXMPTPERCENT sy-vline 
WA_FAC_DZCUSTWTAX_STR-EXEMPTIONREASON sy-vline 
WA_FAC_DZCUSTWTAX_STR-WHLDGTAXCODENAME sy-vline 
WA_FAC_DZCUSTWTAX_STR-WITHHOLDINGTAXTYPENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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