ABAP Select data from SAP table V_CWTYVS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_CWTYVS 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_CWTYVS. 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_CWTYVS 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_CWTYVS TYPE STANDARD TABLE OF V_CWTYVS,
      WA_V_CWTYVS TYPE V_CWTYVS,
      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_CWTYVS> TYPE V_CWTYVS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_CWTYVS
*  INTO TABLE @DATA(IT_V_CWTYVS2).
*--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_CWTYVS INDEX 1 INTO DATA(WA_V_CWTYVS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_CWTYVS>-MANDT = 1.
<V_CWTYVS>-BUKRS = 1.
<V_CWTYVS>-APPLIC = 1.
<V_CWTYVS>-EVENT = 1.
<V_CWTYVS>-BOOLCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_CWTYVS-VALID, sy-vline,
  WA_V_CWTYVS-SUBID, sy-vline,
  WA_V_CWTYVS-DATFROM, sy-vline,
  WA_V_CWTYVS-DATTO, sy-vline,
  WA_V_CWTYVS-SEQUENCE, sy-vline,
  WA_V_CWTYVS-ACTIV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_CWTYVS 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_CWTYVS 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_CWTYVS INTO WA_V_CWTYVS.


*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 ALPHA, internal->external for field BOOLCLASS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_CWTYVS-BOOLCLASS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_CWTYVS-BOOLCLASS.
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_CWTYVS_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
APPLIC TYPE STRING,
EVENT TYPE STRING,
BOOLCLASS TYPE STRING,
VALID TYPE STRING,
SUBID TYPE STRING,
DATFROM TYPE STRING,
DATTO TYPE STRING,
SEQUENCE TYPE STRING,
ACTIV TYPE STRING,
VALTXT TYPE STRING,
SUBTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_CWTYVS_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_CWTYVS_STR-MANDT sy-vline 
WA_V_CWTYVS_STR-BUKRS sy-vline 
WA_V_CWTYVS_STR-APPLIC sy-vline 
WA_V_CWTYVS_STR-EVENT sy-vline 
WA_V_CWTYVS_STR-BOOLCLASS sy-vline 
WA_V_CWTYVS_STR-VALID sy-vline 
WA_V_CWTYVS_STR-SUBID sy-vline 
WA_V_CWTYVS_STR-DATFROM sy-vline 
WA_V_CWTYVS_STR-DATTO sy-vline 
WA_V_CWTYVS_STR-SEQUENCE sy-vline 
WA_V_CWTYVS_STR-ACTIV sy-vline 
WA_V_CWTYVS_STR-VALTXT sy-vline 
WA_V_CWTYVS_STR-SUBTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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