ABAP Select data from SAP table PZA_FORM_WTAX_TXCAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PZA_FORM_WTAX_TXCAL
*  INTO TABLE @DATA(IT_PZA_FORM_WTAX_TXCAL2).
*--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_PZA_FORM_WTAX_TXCAL INDEX 1 INTO DATA(WA_PZA_FORM_WTAX_TXCAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PZA_FORM_WTAX_TXCAL>-CERTI = 1.
<PZA_FORM_WTAX_TXCAL>-BEGDA = 1.
<PZA_FORM_WTAX_TXCAL>-ENDDA = 1.
<PZA_FORM_WTAX_TXCAL>-VOLUN = 1.
<PZA_FORM_WTAX_TXCAL>-TOTPR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PZA_FORM_WTAX_TXCAL-WORPR, sy-vline,
  WA_PZA_FORM_WTAX_TXCAL-FIXED, sy-vline,
  WA_PZA_FORM_WTAX_TXCAL-DIRNO, sy-vline,
  WA_PZA_FORM_WTAX_TXCAL-DIRPC, sy-vline,
  WA_PZA_FORM_WTAX_TXCAL-TAXIN, sy-vline,
  WA_PZA_FORM_WTAX_TXCAL-PAYER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PZA_FORM_WTAX_TXCAL 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_PZA_FORM_WTAX_TXCAL 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_PZA_FORM_WTAX_TXCAL INTO WA_PZA_FORM_WTAX_TXCAL.


*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_PZA_FORM_WTAX_TXCAL_STR, 
CERTI TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
VOLUN TYPE STRING,
TOTPR TYPE STRING,
WORPR TYPE STRING,
FIXED TYPE STRING,
DIRNO TYPE STRING,
DIRPC TYPE STRING,
TAXIN TYPE STRING,
PAYER TYPE STRING,
NAPER TYPE STRING,
PERMO TYPE STRING,
TXPRO TYPE STRING,
FOINC TYPE STRING,
EXFIN TYPE STRING,
INDLG TYPE STRING,
LABRK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PZA_FORM_WTAX_TXCAL_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_PZA_FORM_WTAX_TXCAL_STR-CERTI sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-BEGDA sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-ENDDA sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-VOLUN sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-TOTPR sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-WORPR sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-FIXED sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-DIRNO sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-DIRPC sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-TAXIN sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-PAYER sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-NAPER sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-PERMO sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-TXPRO sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-FOINC sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-EXFIN sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-INDLG sy-vline 
WA_PZA_FORM_WTAX_TXCAL_STR-LABRK sy-vline      INTO ld_text SEPARATED BY SPACE.

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