ABAP Select data from SAP table V_CNVPACK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_CNVPACK 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_CNVPACK. 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_CNVPACK 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_CNVPACK TYPE STANDARD TABLE OF V_CNVPACK,
      WA_V_CNVPACK TYPE V_CNVPACK,
      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_CNVPACK> TYPE V_CNVPACK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_CNVPACK
*  INTO TABLE @DATA(IT_V_CNVPACK2).
*--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_CNVPACK INDEX 1 INTO DATA(WA_V_CNVPACK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_CNVPACK>-MANDT = 1.
<V_CNVPACK>-PACKID = 1.
<V_CNVPACK>-DESCRIPT = 1.
<V_CNVPACK>-TYPE = 1.
<V_CNVPACK>-SAPRELMIN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_CNVPACK-SAPRELMAX, sy-vline,
  WA_V_CNVPACK-DEVCLASS, sy-vline,
  WA_V_CNVPACK-KEYCHVIEWS, sy-vline,
  WA_V_CNVPACK-ORGDEPENDENT, sy-vline,
  WA_V_CNVPACK-DERIVATIONTYPE, sy-vline,
  WA_V_CNVPACK-MATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_CNVPACK 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_CNVPACK 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_CNVPACK INTO WA_V_CNVPACK.


*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_CNVPACK_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
DESCRIPT TYPE STRING,
TYPE TYPE STRING,
SAPRELMIN TYPE STRING,
SAPRELMAX TYPE STRING,
DEVCLASS TYPE STRING,
KEYCHVIEWS TYPE STRING,
ORGDEPENDENT TYPE STRING,
DERIVATIONTYPE TYPE STRING,
MATNR TYPE STRING,
DELTAPACKID TYPE STRING,
USECLTECH TYPE STRING,
USEDROPINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_CNVPACK_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_CNVPACK_STR-MANDT sy-vline 
WA_V_CNVPACK_STR-PACKID sy-vline 
WA_V_CNVPACK_STR-DESCRIPT sy-vline 
WA_V_CNVPACK_STR-TYPE sy-vline 
WA_V_CNVPACK_STR-SAPRELMIN sy-vline 
WA_V_CNVPACK_STR-SAPRELMAX sy-vline 
WA_V_CNVPACK_STR-DEVCLASS sy-vline 
WA_V_CNVPACK_STR-KEYCHVIEWS sy-vline 
WA_V_CNVPACK_STR-ORGDEPENDENT sy-vline 
WA_V_CNVPACK_STR-DERIVATIONTYPE sy-vline 
WA_V_CNVPACK_STR-MATNR sy-vline 
WA_V_CNVPACK_STR-DELTAPACKID sy-vline 
WA_V_CNVPACK_STR-USECLTECH sy-vline 
WA_V_CNVPACK_STR-USEDROPINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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