ABAP Select data from SAP table RPTWTAX_ALV2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RPTWTAX_ALV2 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 RPTWTAX_ALV2. 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 RPTWTAX_ALV2 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_RPTWTAX_ALV2 TYPE STANDARD TABLE OF RPTWTAX_ALV2,
      WA_RPTWTAX_ALV2 TYPE RPTWTAX_ALV2,
      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: <RPTWTAX_ALV2> TYPE RPTWTAX_ALV2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RPTWTAX_ALV2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RPTWTAX_ALV2
  INTO TABLE IT_RPTWTAX_ALV2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPTWTAX_ALV2
*  INTO TABLE @DATA(IT_RPTWTAX_ALV22).
*--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_RPTWTAX_ALV2 INDEX 1 INTO DATA(WA_RPTWTAX_ALV22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RPTWTAX_ALV2 ASSIGNING <RPTWTAX_ALV2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPTWTAX_ALV2>-STAT2 = 1.
<RPTWTAX_ALV2>-ORGEH = 1.
<RPTWTAX_ALV2>-NATIO = 1.
<RPTWTAX_ALV2>-PERNR = 1.
<RPTWTAX_ALV2>-NAME = 1.

ENDLOOP.

LOOP AT IT_RPTWTAX_ALV2 INTO WA_RPTWTAX_ALV2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPTWTAX_ALV2-TAXID, sy-vline,
  WA_RPTWTAX_ALV2-GROSS, sy-vline,
  WA_RPTWTAX_ALV2-TAX, sy-vline,
  WA_RPTWTAX_ALV2-NET, sy-vline,
  WA_RPTWTAX_ALV2-TFORM, sy-vline,
  WA_RPTWTAX_ALV2-ADDRESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPTWTAX_ALV2 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_RPTWTAX_ALV2 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_RPTWTAX_ALV2 INTO WA_RPTWTAX_ALV2.


*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_RPTWTAX_ALV2_STR, 
STAT2 TYPE STRING,
ORGEH TYPE STRING,
NATIO TYPE STRING,
PERNR TYPE STRING,
NAME TYPE STRING,
TAXID TYPE STRING,
GROSS TYPE STRING,
TAX TYPE STRING,
NET TYPE STRING,
TFORM TYPE STRING,
ADDRESS TYPE STRING,
PTW_YEAR TYPE STRING,
PTW_FROM TYPE STRING,
PTW_TO TYPE STRING,
ENTBD TYPE STRING,
ENTID TYPE STRING,
ENTAU TYPE STRING,
ENTXM TYPE STRING,
PENSION_AMOUNT TYPE STRING,
REMAK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPTWTAX_ALV2_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_RPTWTAX_ALV2_STR-STAT2 sy-vline 
WA_RPTWTAX_ALV2_STR-ORGEH sy-vline 
WA_RPTWTAX_ALV2_STR-NATIO sy-vline 
WA_RPTWTAX_ALV2_STR-PERNR sy-vline 
WA_RPTWTAX_ALV2_STR-NAME sy-vline 
WA_RPTWTAX_ALV2_STR-TAXID sy-vline 
WA_RPTWTAX_ALV2_STR-GROSS sy-vline 
WA_RPTWTAX_ALV2_STR-TAX sy-vline 
WA_RPTWTAX_ALV2_STR-NET sy-vline 
WA_RPTWTAX_ALV2_STR-TFORM sy-vline 
WA_RPTWTAX_ALV2_STR-ADDRESS sy-vline 
WA_RPTWTAX_ALV2_STR-PTW_YEAR sy-vline 
WA_RPTWTAX_ALV2_STR-PTW_FROM sy-vline 
WA_RPTWTAX_ALV2_STR-PTW_TO sy-vline 
WA_RPTWTAX_ALV2_STR-ENTBD sy-vline 
WA_RPTWTAX_ALV2_STR-ENTID sy-vline 
WA_RPTWTAX_ALV2_STR-ENTAU sy-vline 
WA_RPTWTAX_ALV2_STR-ENTXM sy-vline 
WA_RPTWTAX_ALV2_STR-PENSION_AMOUNT sy-vline 
WA_RPTWTAX_ALV2_STR-REMAK sy-vline      INTO ld_text SEPARATED BY SPACE.

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