ABAP Select data from SAP table REXCAT_RAB_TAX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXCAT_RAB_TAX
*  INTO TABLE @DATA(IT_REXCAT_RAB_TAX2).
*--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_REXCAT_RAB_TAX INDEX 1 INTO DATA(WA_REXCAT_RAB_TAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXCAT_RAB_TAX>-VAT = 1.
<REXCAT_RAB_TAX>-ITEMS = 1.
<REXCAT_RAB_TAX>-TAX_EXEMPTION = 1.
<REXCAT_RAB_TAX>-OTHER_TAX = 1.
<REXCAT_RAB_TAX>-EXTENSION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXCAT_RAB_TAX-SV_EXTENSION, sy-vline,
  WA_REXCAT_RAB_TAX-CUSTOM, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_REXCAT_RAB_TAX 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_REXCAT_RAB_TAX 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_REXCAT_RAB_TAX INTO WA_REXCAT_RAB_TAX.


*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_REXCAT_RAB_TAX_STR, 
VAT TYPE STRING,
ITEMS TYPE STRING,
TAX_EXEMPTION TYPE STRING,
OTHER_TAX TYPE STRING,
EXTENSION TYPE STRING,
SV_EXTENSION TYPE STRING,
CUSTOM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXCAT_RAB_TAX_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_REXCAT_RAB_TAX_STR-VAT sy-vline 
WA_REXCAT_RAB_TAX_STR-ITEMS sy-vline 
WA_REXCAT_RAB_TAX_STR-TAX_EXEMPTION sy-vline 
WA_REXCAT_RAB_TAX_STR-OTHER_TAX sy-vline 
WA_REXCAT_RAB_TAX_STR-EXTENSION sy-vline 
WA_REXCAT_RAB_TAX_STR-SV_EXTENSION sy-vline 
WA_REXCAT_RAB_TAX_STR-CUSTOM sy-vline      INTO ld_text SEPARATED BY SPACE.

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