ABAP Select data from SAP table PZA_FORM_WTAX 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 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. 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 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 TYPE STANDARD TABLE OF PZA_FORM_WTAX,
      WA_PZA_FORM_WTAX TYPE PZA_FORM_WTAX,
      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> TYPE PZA_FORM_WTAX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PZA_FORM_WTAX
*  INTO TABLE @DATA(IT_PZA_FORM_WTAX2).
*--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 INDEX 1 INTO DATA(WA_PZA_FORM_WTAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PZA_FORM_WTAX>-INCOME = 1.
<PZA_FORM_WTAX>-GROSS = 1.
<PZA_FORM_WTAX>-DEDUCTIONS = 1.
<PZA_FORM_WTAX>-EMPLOYER_CONTR = 1.
<PZA_FORM_WTAX>-EMPLOYEE_CONTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PZA_FORM_WTAX-EMPLR, sy-vline,
  WA_PZA_FORM_WTAX-DIPIN, sy-vline,
  WA_PZA_FORM_WTAX-LINE0, sy-vline,
  WA_PZA_FORM_WTAX-LINE1, sy-vline,
  WA_PZA_FORM_WTAX-LINE2, sy-vline,
  WA_PZA_FORM_WTAX-LINE3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PZA_FORM_WTAX 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 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 INTO WA_PZA_FORM_WTAX.


*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 PDATE, internal->external for field GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_PZA_FORM_WTAX-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PZA_FORM_WTAX-GBDAT.
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_PZA_FORM_WTAX_STR, 
INCOME TYPE STRING,
GROSS TYPE STRING,
DEDUCTIONS TYPE STRING,
EMPLOYER_CONTR TYPE STRING,
EMPLOYEE_CONTR TYPE STRING,
EMPLR TYPE STRING,
DIPIN TYPE STRING,
LINE0 TYPE STRING,
LINE1 TYPE STRING,
LINE2 TYPE STRING,
LINE3 TYPE STRING,
LINE4 TYPE STRING,
PSTLZ TYPE STRING,
RECRD TYPE STRING,
REFNO TYPE STRING,
TAXYR TYPE STRING,
TXCER TYPE STRING,
SIC TYPE STRING,
EMPLE TYPE STRING,
NAPER TYPE STRING,
NAME TYPE STRING,
IT3RS TYPE STRING,
IT3RD TYPE STRING,
CTYPE TYPE STRING,
PAGEN TYPE STRING,
CERTN TYPE STRING,
LABRK TYPE STRING,
VORNA TYPE STRING,
INITS TYPE STRING,
PERID TYPE STRING,
GBDAT TYPE STRING,
PERNR TYPE STRING,
STRAS TYPE STRING,
LOCAT TYPE STRING,
ORT02 TYPE STRING,
ORT01 TYPE STRING,
PSTL TYPE STRING,
ICNUM TYPE STRING,
REGNO TYPE STRING,
REFNO TYPE STRING,
ETI TYPE STRING,
SIC TYPE STRING,
TXCAL TYPE STRING,
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,
WTAX_FLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PZA_FORM_WTAX_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_STR-INCOME sy-vline 
WA_PZA_FORM_WTAX_STR-GROSS sy-vline 
WA_PZA_FORM_WTAX_STR-DEDUCTIONS sy-vline 
WA_PZA_FORM_WTAX_STR-EMPLOYER_CONTR sy-vline 
WA_PZA_FORM_WTAX_STR-EMPLOYEE_CONTR sy-vline 
WA_PZA_FORM_WTAX_STR-EMPLR sy-vline 
WA_PZA_FORM_WTAX_STR-DIPIN sy-vline 
WA_PZA_FORM_WTAX_STR-LINE0 sy-vline 
WA_PZA_FORM_WTAX_STR-LINE1 sy-vline 
WA_PZA_FORM_WTAX_STR-LINE2 sy-vline 
WA_PZA_FORM_WTAX_STR-LINE3 sy-vline 
WA_PZA_FORM_WTAX_STR-LINE4 sy-vline 
WA_PZA_FORM_WTAX_STR-PSTLZ sy-vline 
WA_PZA_FORM_WTAX_STR-RECRD sy-vline 
WA_PZA_FORM_WTAX_STR-REFNO sy-vline 
WA_PZA_FORM_WTAX_STR-TAXYR sy-vline 
WA_PZA_FORM_WTAX_STR-TXCER sy-vline 
WA_PZA_FORM_WTAX_STR-SIC sy-vline 
WA_PZA_FORM_WTAX_STR-EMPLE sy-vline 
WA_PZA_FORM_WTAX_STR-NAPER sy-vline 
WA_PZA_FORM_WTAX_STR-NAME sy-vline 
WA_PZA_FORM_WTAX_STR-IT3RS sy-vline 
WA_PZA_FORM_WTAX_STR-IT3RD sy-vline 
WA_PZA_FORM_WTAX_STR-CTYPE sy-vline 
WA_PZA_FORM_WTAX_STR-PAGEN sy-vline 
WA_PZA_FORM_WTAX_STR-CERTN sy-vline 
WA_PZA_FORM_WTAX_STR-LABRK sy-vline 
WA_PZA_FORM_WTAX_STR-VORNA sy-vline 
WA_PZA_FORM_WTAX_STR-INITS sy-vline 
WA_PZA_FORM_WTAX_STR-PERID sy-vline 
WA_PZA_FORM_WTAX_STR-GBDAT sy-vline 
WA_PZA_FORM_WTAX_STR-PERNR sy-vline 
WA_PZA_FORM_WTAX_STR-STRAS sy-vline 
WA_PZA_FORM_WTAX_STR-LOCAT sy-vline 
WA_PZA_FORM_WTAX_STR-ORT02 sy-vline 
WA_PZA_FORM_WTAX_STR-ORT01 sy-vline 
WA_PZA_FORM_WTAX_STR-PSTL sy-vline 
WA_PZA_FORM_WTAX_STR-ICNUM sy-vline 
WA_PZA_FORM_WTAX_STR-REGNO sy-vline 
WA_PZA_FORM_WTAX_STR-REFNO sy-vline 
WA_PZA_FORM_WTAX_STR-ETI sy-vline 
WA_PZA_FORM_WTAX_STR-SIC sy-vline 
WA_PZA_FORM_WTAX_STR-TXCAL sy-vline 
WA_PZA_FORM_WTAX_STR-CERTI sy-vline 
WA_PZA_FORM_WTAX_STR-BEGDA sy-vline 
WA_PZA_FORM_WTAX_STR-ENDDA sy-vline 
WA_PZA_FORM_WTAX_STR-VOLUN sy-vline 
WA_PZA_FORM_WTAX_STR-TOTPR sy-vline 
WA_PZA_FORM_WTAX_STR-WORPR sy-vline 
WA_PZA_FORM_WTAX_STR-FIXED sy-vline 
WA_PZA_FORM_WTAX_STR-DIRNO sy-vline 
WA_PZA_FORM_WTAX_STR-DIRPC sy-vline 
WA_PZA_FORM_WTAX_STR-TAXIN sy-vline 
WA_PZA_FORM_WTAX_STR-PAYER sy-vline 
WA_PZA_FORM_WTAX_STR-NAPER sy-vline 
WA_PZA_FORM_WTAX_STR-PERMO sy-vline 
WA_PZA_FORM_WTAX_STR-TXPRO sy-vline 
WA_PZA_FORM_WTAX_STR-FOINC sy-vline 
WA_PZA_FORM_WTAX_STR-EXFIN sy-vline 
WA_PZA_FORM_WTAX_STR-INDLG sy-vline 
WA_PZA_FORM_WTAX_STR-LABRK sy-vline 
WA_PZA_FORM_WTAX_STR-WTAX_FLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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