ABAP Select data from SAP table IDGT_S_VATI_WRITE_BACK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDGT_S_VATI_WRITE_BACK
*  INTO TABLE @DATA(IT_IDGT_S_VATI_WRITE_BACK2).
*--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_IDGT_S_VATI_WRITE_BACK INDEX 1 INTO DATA(WA_IDGT_S_VATI_WRITE_BACK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDGT_S_VATI_WRITE_BACK>-VBELN_VAT = 1.
<IDGT_S_VATI_WRITE_BACK>-TYPCODE = 1.
<IDGT_S_VATI_WRITE_BACK>-DISIND = 1.
<IDGT_S_VATI_WRITE_BACK>-MATNR = 1.
<IDGT_S_VATI_WRITE_BACK>-MAKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDGT_S_VATI_WRITE_BACK-MSPEC, sy-vline,
  WA_IDGT_S_VATI_WRITE_BACK-MEINS, sy-vline,
  WA_IDGT_S_VATI_WRITE_BACK-UOMDESC, sy-vline,
  WA_IDGT_S_VATI_WRITE_BACK-FKIMG, sy-vline,
  WA_IDGT_S_VATI_WRITE_BACK-NETWR, sy-vline,
  WA_IDGT_S_VATI_WRITE_BACK-TAXAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDGT_S_VATI_WRITE_BACK 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_IDGT_S_VATI_WRITE_BACK 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_IDGT_S_VATI_WRITE_BACK INTO WA_IDGT_S_VATI_WRITE_BACK.


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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_IDGT_S_VATI_WRITE_BACK-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDGT_S_VATI_WRITE_BACK-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IDGT_S_VATI_WRITE_BACK-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDGT_S_VATI_WRITE_BACK-MEINS.
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_IDGT_S_VATI_WRITE_BACK_STR, 
VBELN_VAT TYPE STRING,
TYPCODE TYPE STRING,
DISIND TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
MSPEC TYPE STRING,
MEINS TYPE STRING,
UOMDESC TYPE STRING,
FKIMG TYPE STRING,
NETWR TYPE STRING,
TAXAMT TYPE STRING,
UNITPE TYPE STRING,
TAXCOD TYPE STRING,
ADDITION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDGT_S_VATI_WRITE_BACK_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_IDGT_S_VATI_WRITE_BACK_STR-VBELN_VAT sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-TYPCODE sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-DISIND sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-MATNR sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-MAKTX sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-MSPEC sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-MEINS sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-UOMDESC sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-FKIMG sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-NETWR sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-TAXAMT sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-UNITPE sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-TAXCOD sy-vline 
WA_IDGT_S_VATI_WRITE_BACK_STR-ADDITION sy-vline      INTO ld_text SEPARATED BY SPACE.

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