ABAP Select data from SAP table V_TWPB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWPB 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_TWPB. 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_TWPB 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_TWPB TYPE STANDARD TABLE OF V_TWPB,
      WA_V_TWPB TYPE V_TWPB,
      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_TWPB> TYPE V_TWPB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWPB
*  INTO TABLE @DATA(IT_V_TWPB2).
*--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_TWPB INDEX 1 INTO DATA(WA_V_TWPB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWPB>-MANDT = 1.
<V_TWPB>-BUKRS = 1.
<V_TWPB>-GSART = 1.
<V_TWPB>-RANTYP = 1.
<V_TWPB>-SANLF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWPB-SKOGRP, sy-vline,
  WA_V_TWPB-LTX, sy-vline,
  WA_V_TWPB-DSART, sy-vline,
  WA_V_TWPB-APLAN, sy-vline,
  WA_V_TWPB-AARCHI, sy-vline,
  WA_V_TWPB-SVERDI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWPB 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_TWPB 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_TWPB INTO WA_V_TWPB.


*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_V_TWPB_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
GSART TYPE STRING,
RANTYP TYPE STRING,
SANLF TYPE STRING,
SKOGRP TYPE STRING,
LTX TYPE STRING,
DSART TYPE STRING,
APLAN TYPE STRING,
AARCHI TYPE STRING,
SVERDI TYPE STRING,
AVERDI TYPE STRING,
SBUHAL TYPE STRING,
ZLSCH TYPE STRING,
SZVDEB TYPE STRING,
SDEBAUT TYPE STRING,
SBUST TYPE STRING,
SZEGEN TYPE STRING,
VVRANLWI1 TYPE STRING,
VVRANLWI2 TYPE STRING,
JAUSWA TYPE STRING,
AUSWA TYPE STRING,
STAXGEN TYPE STRING,
VLTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWPB_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_TWPB_STR-MANDT sy-vline 
WA_V_TWPB_STR-BUKRS sy-vline 
WA_V_TWPB_STR-GSART sy-vline 
WA_V_TWPB_STR-RANTYP sy-vline 
WA_V_TWPB_STR-SANLF sy-vline 
WA_V_TWPB_STR-SKOGRP sy-vline 
WA_V_TWPB_STR-LTX sy-vline 
WA_V_TWPB_STR-DSART sy-vline 
WA_V_TWPB_STR-APLAN sy-vline 
WA_V_TWPB_STR-AARCHI sy-vline 
WA_V_TWPB_STR-SVERDI sy-vline 
WA_V_TWPB_STR-AVERDI sy-vline 
WA_V_TWPB_STR-SBUHAL sy-vline 
WA_V_TWPB_STR-ZLSCH sy-vline 
WA_V_TWPB_STR-SZVDEB sy-vline 
WA_V_TWPB_STR-SDEBAUT sy-vline 
WA_V_TWPB_STR-SBUST sy-vline 
WA_V_TWPB_STR-SZEGEN sy-vline 
WA_V_TWPB_STR-VVRANLWI1 sy-vline 
WA_V_TWPB_STR-VVRANLWI2 sy-vline 
WA_V_TWPB_STR-JAUSWA sy-vline 
WA_V_TWPB_STR-AUSWA sy-vline 
WA_V_TWPB_STR-STAXGEN sy-vline 
WA_V_TWPB_STR-VLTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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