ABAP Select data from SAP table V_TWCP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWCP 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_TWCP. 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_TWCP 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_TWCP TYPE STANDARD TABLE OF V_TWCP,
      WA_V_TWCP TYPE V_TWCP,
      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_TWCP> TYPE V_TWCP.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWCP
*  INTO TABLE @DATA(IT_V_TWCP2).
*--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_TWCP INDEX 1 INTO DATA(WA_V_TWCP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWCP>-MANDT = 1.
<V_TWCP>-CNPRO = 1.
<V_TWCP>-DESCR = 1.
<V_TWCP>-SHARE1 = 1.
<V_TWCP>-SHARE2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWCP-SHARE3, sy-vline,
  WA_V_TWCP-CONDTYPE1, sy-vline,
  WA_V_TWCP-CONDTYPE2, sy-vline,
  WA_V_TWCP-CONDTYPE3, sy-vline,
  WA_V_TWCP-ACCKEY1, sy-vline,
  WA_V_TWCP-ACCKEY2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWCP 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_TWCP 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_TWCP INTO WA_V_TWCP.


*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_TWCP_STR, 
MANDT TYPE STRING,
CNPRO TYPE STRING,
DESCR TYPE STRING,
SHARE1 TYPE STRING,
SHARE2 TYPE STRING,
SHARE3 TYPE STRING,
CONDTYPE1 TYPE STRING,
CONDTYPE2 TYPE STRING,
CONDTYPE3 TYPE STRING,
ACCKEY1 TYPE STRING,
ACCKEY2 TYPE STRING,
ACCKEY3 TYPE STRING,
MARGEFF1 TYPE STRING,
MARGEFF2 TYPE STRING,
MARGEFF3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWCP_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_TWCP_STR-MANDT sy-vline 
WA_V_TWCP_STR-CNPRO sy-vline 
WA_V_TWCP_STR-DESCR sy-vline 
WA_V_TWCP_STR-SHARE1 sy-vline 
WA_V_TWCP_STR-SHARE2 sy-vline 
WA_V_TWCP_STR-SHARE3 sy-vline 
WA_V_TWCP_STR-CONDTYPE1 sy-vline 
WA_V_TWCP_STR-CONDTYPE2 sy-vline 
WA_V_TWCP_STR-CONDTYPE3 sy-vline 
WA_V_TWCP_STR-ACCKEY1 sy-vline 
WA_V_TWCP_STR-ACCKEY2 sy-vline 
WA_V_TWCP_STR-ACCKEY3 sy-vline 
WA_V_TWCP_STR-MARGEFF1 sy-vline 
WA_V_TWCP_STR-MARGEFF2 sy-vline 
WA_V_TWCP_STR-MARGEFF3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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