ABAP Select data from SAP table V_T300 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_T300 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_T300. 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_T300 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_T300 TYPE STANDARD TABLE OF V_T300,
      WA_V_T300 TYPE V_T300,
      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_T300> TYPE V_T300.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_T300.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_T300
  INTO TABLE IT_V_T300.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_T300
*  INTO TABLE @DATA(IT_V_T3002).
*--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_T300 INDEX 1 INTO DATA(WA_V_T3002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_T300 ASSIGNING <V_T300>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_T300>-MANDT = 1.
<V_T300>-LGNUM = 1.
<V_T300>-REGKZ = 1.
<V_T300>-LNUMT = 1.
<V_T300>-VOME1 = 1.

ENDLOOP.

LOOP AT IT_V_T300 INTO WA_V_T300.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_T300-VOME2, sy-vline,
  WA_V_T300-MTBPS, sy-vline,
  WA_V_T300-MINPS, sy-vline,
  WA_V_T300-NUKQU, sy-vline,
  WA_V_T300-NUKTA, sy-vline,
  WA_V_T300-NUKTB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_T300 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_T300 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_T300 INTO WA_V_T300.


*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 CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_T300-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_T300-GEWEI.
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_T300_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
REGKZ TYPE STRING,
LNUMT TYPE STRING,
VOME1 TYPE STRING,
VOME2 TYPE STRING,
MTBPS TYPE STRING,
MINPS TYPE STRING,
NUKQU TYPE STRING,
NUKTA TYPE STRING,
NUKTB TYPE STRING,
NUKIV TYPE STRING,
GEWEI TYPE STRING,
NAKAP TYPE STRING,
MFCHA TYPE STRING,
NUKUB TYPE STRING,
KOMTK TYPE STRING,
REPID TYPE STRING,
TEILV TYPE STRING,
NUKIT TYPE STRING,
BWPLU TYPE STRING,
BWMIN TYPE STRING,
NUKRF TYPE STRING,
KAPPC TYPE STRING,
REGKT TYPE STRING,
LENVW TYPE STRING,
NUKLE TYPE STRING,
VERLE TYPE STRING,
LVSDZ TYPE STRING,
ENQUE TYPE STRING,
WMPPI TYPE STRING,
TEILS TYPE STRING,
CHSWM TYPE STRING,
MHDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_T300_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_T300_STR-MANDT sy-vline 
WA_V_T300_STR-LGNUM sy-vline 
WA_V_T300_STR-REGKZ sy-vline 
WA_V_T300_STR-LNUMT sy-vline 
WA_V_T300_STR-VOME1 sy-vline 
WA_V_T300_STR-VOME2 sy-vline 
WA_V_T300_STR-MTBPS sy-vline 
WA_V_T300_STR-MINPS sy-vline 
WA_V_T300_STR-NUKQU sy-vline 
WA_V_T300_STR-NUKTA sy-vline 
WA_V_T300_STR-NUKTB sy-vline 
WA_V_T300_STR-NUKIV sy-vline 
WA_V_T300_STR-GEWEI sy-vline 
WA_V_T300_STR-NAKAP sy-vline 
WA_V_T300_STR-MFCHA sy-vline 
WA_V_T300_STR-NUKUB sy-vline 
WA_V_T300_STR-KOMTK sy-vline 
WA_V_T300_STR-REPID sy-vline 
WA_V_T300_STR-TEILV sy-vline 
WA_V_T300_STR-NUKIT sy-vline 
WA_V_T300_STR-BWPLU sy-vline 
WA_V_T300_STR-BWMIN sy-vline 
WA_V_T300_STR-NUKRF sy-vline 
WA_V_T300_STR-KAPPC sy-vline 
WA_V_T300_STR-REGKT sy-vline 
WA_V_T300_STR-LENVW sy-vline 
WA_V_T300_STR-NUKLE sy-vline 
WA_V_T300_STR-VERLE sy-vline 
WA_V_T300_STR-LVSDZ sy-vline 
WA_V_T300_STR-ENQUE sy-vline 
WA_V_T300_STR-WMPPI sy-vline 
WA_V_T300_STR-TEILS sy-vline 
WA_V_T300_STR-CHSWM sy-vline 
WA_V_T300_STR-MHDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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