ABAP Select data from SAP table V_TWPIO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWPIO
*  INTO TABLE @DATA(IT_V_TWPIO2).
*--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_V_TWPIO INDEX 1 INTO DATA(WA_V_TWPIO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWPIO>-MANDT = 1.
<V_TWPIO>-INPRO = 1.
<V_TWPIO>-BTYPV = 1.
<V_TWPIO>-DEFLFART = 1.
<V_TWPIO>-MEFIND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWPIO-WARNLEVEL, sy-vline,
  WA_V_TWPIO-DEFKA, sy-vline,
  WA_V_TWPIO-DEFBA, sy-vline,
  WA_V_TWPIO-SUBSTNB, sy-vline,
  WA_V_TWPIO-SUBSTUB, sy-vline,
  WA_V_TWPIO-GPONZU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWPIO 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_V_TWPIO 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_V_TWPIO INTO WA_V_TWPIO.


*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 AUART, internal->external for field DEFKA
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_V_TWPIO-DEFKA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TWPIO-DEFKA.
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_V_TWPIO_STR, 
MANDT TYPE STRING,
INPRO TYPE STRING,
BTYPV TYPE STRING,
DEFLFART TYPE STRING,
MEFIND TYPE STRING,
WARNLEVEL TYPE STRING,
DEFKA TYPE STRING,
DEFBA TYPE STRING,
SUBSTNB TYPE STRING,
SUBSTUB TYPE STRING,
GPONZU TYPE STRING,
CHKDO TYPE STRING,
ANTWORTART TYPE STRING,
BELEGFLUSS TYPE STRING,
BZQFNOCHKR TYPE STRING,
BZQFCHEAP TYPE STRING,
TWOSTEP TYPE STRING,
CHKODISPOV TYPE STRING,
BTYPVNEX TYPE STRING,
BTYPVNIN TYPE STRING,
BTYPVFEX TYPE STRING,
BTYPVFIN TYPE STRING,
FAWFSET TYPE STRING,
FAWFPAT TYPE STRING,
KONSUCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWPIO_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_V_TWPIO_STR-MANDT sy-vline 
WA_V_TWPIO_STR-INPRO sy-vline 
WA_V_TWPIO_STR-BTYPV sy-vline 
WA_V_TWPIO_STR-DEFLFART sy-vline 
WA_V_TWPIO_STR-MEFIND sy-vline 
WA_V_TWPIO_STR-WARNLEVEL sy-vline 
WA_V_TWPIO_STR-DEFKA sy-vline 
WA_V_TWPIO_STR-DEFBA sy-vline 
WA_V_TWPIO_STR-SUBSTNB sy-vline 
WA_V_TWPIO_STR-SUBSTUB sy-vline 
WA_V_TWPIO_STR-GPONZU sy-vline 
WA_V_TWPIO_STR-CHKDO sy-vline 
WA_V_TWPIO_STR-ANTWORTART sy-vline 
WA_V_TWPIO_STR-BELEGFLUSS sy-vline 
WA_V_TWPIO_STR-BZQFNOCHKR sy-vline 
WA_V_TWPIO_STR-BZQFCHEAP sy-vline 
WA_V_TWPIO_STR-TWOSTEP sy-vline 
WA_V_TWPIO_STR-CHKODISPOV sy-vline 
WA_V_TWPIO_STR-BTYPVNEX sy-vline 
WA_V_TWPIO_STR-BTYPVNIN sy-vline 
WA_V_TWPIO_STR-BTYPVFEX sy-vline 
WA_V_TWPIO_STR-BTYPVFIN sy-vline 
WA_V_TWPIO_STR-FAWFSET sy-vline 
WA_V_TWPIO_STR-FAWFPAT sy-vline 
WA_V_TWPIO_STR-KONSUCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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