ABAP Select data from SAP table V_TWPCTYPE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWPCTYPE 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_TWPCTYPE. 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_TWPCTYPE 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_TWPCTYPE TYPE STANDARD TABLE OF V_TWPCTYPE,
      WA_V_TWPCTYPE TYPE V_TWPCTYPE,
      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_TWPCTYPE> TYPE V_TWPCTYPE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWPCTYPE
*  INTO TABLE @DATA(IT_V_TWPCTYPE2).
*--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_TWPCTYPE INDEX 1 INTO DATA(WA_V_TWPCTYPE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWPCTYPE>-MANDT = 1.
<V_TWPCTYPE>-PCTYP = 1.
<V_TWPCTYPE>-DESCR = 1.
<V_TWPCTYPE>-ONUSE = 1.
<V_TWPCTYPE>-CCOBL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWPCTYPE-CCREP, sy-vline,
  WA_V_TWPCTYPE-CCNRA, sy-vline,
  WA_V_TWPCTYPE-PROM, sy-vline,
  WA_V_TWPCTYPE-TCOPY, sy-vline,
  WA_V_TWPCTYPE-LCOPY, sy-vline,
  WA_V_TWPCTYPE-ONFMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWPCTYPE 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_TWPCTYPE 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_TWPCTYPE INTO WA_V_TWPCTYPE.


*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_TWPCTYPE_STR, 
MANDT TYPE STRING,
PCTYP TYPE STRING,
DESCR TYPE STRING,
ONUSE TYPE STRING,
CCOBL TYPE STRING,
CCREP TYPE STRING,
CCNRA TYPE STRING,
PROM TYPE STRING,
TCOPY TYPE STRING,
LCOPY TYPE STRING,
ONFMT TYPE STRING,
ONSEP TYPE STRING,
ONCHG TYPE STRING,
GAWOV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWPCTYPE_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_TWPCTYPE_STR-MANDT sy-vline 
WA_V_TWPCTYPE_STR-PCTYP sy-vline 
WA_V_TWPCTYPE_STR-DESCR sy-vline 
WA_V_TWPCTYPE_STR-ONUSE sy-vline 
WA_V_TWPCTYPE_STR-CCOBL sy-vline 
WA_V_TWPCTYPE_STR-CCREP sy-vline 
WA_V_TWPCTYPE_STR-CCNRA sy-vline 
WA_V_TWPCTYPE_STR-PROM sy-vline 
WA_V_TWPCTYPE_STR-TCOPY sy-vline 
WA_V_TWPCTYPE_STR-LCOPY sy-vline 
WA_V_TWPCTYPE_STR-ONFMT sy-vline 
WA_V_TWPCTYPE_STR-ONSEP sy-vline 
WA_V_TWPCTYPE_STR-ONCHG sy-vline 
WA_V_TWPCTYPE_STR-GAWOV sy-vline      INTO ld_text SEPARATED BY SPACE.

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