ABAP Select data from SAP table COMV_PR_CAT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP COMV_PR_CAT 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 COMV_PR_CAT. 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 COMV_PR_CAT 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_COMV_PR_CAT TYPE STANDARD TABLE OF COMV_PR_CAT,
      WA_COMV_PR_CAT TYPE COMV_PR_CAT,
      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: <COMV_PR_CAT> TYPE COMV_PR_CAT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMV_PR_CAT
*  INTO TABLE @DATA(IT_COMV_PR_CAT2).
*--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_COMV_PR_CAT INDEX 1 INTO DATA(WA_COMV_PR_CAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMV_PR_CAT>-CLIENT = 1.
<COMV_PR_CAT>-PRODUCT_GUID = 1.
<COMV_PR_CAT>-CATEGORY_GUID = 1.
<COMV_PR_CAT>-CATEGORY_ID = 1.
<COMV_PR_CAT>-HIERARCHY_GUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMV_PR_CAT-HIERARCHY_ID, sy-vline,
  WA_COMV_PR_CAT-LANGU, sy-vline,
  WA_COMV_PR_CAT-SHTEXT_LARGE, sy-vline,
  WA_COMV_PR_CAT-SHORT_TEXT, sy-vline,
  WA_COMV_PR_CAT-PRODUCT_ID, sy-vline,
  WA_COMV_PR_CAT-PRODUCT_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMV_PR_CAT 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_COMV_PR_CAT 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_COMV_PR_CAT INTO WA_COMV_PR_CAT.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_COMV_PR_CAT-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMV_PR_CAT-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PRID1, internal->external for field PRODUCT_ID
CALL FUNCTION 'CONVERSION_EXIT_PRID1_OUTPUT'
  EXPORTING
    input =                      WA_COMV_PR_CAT-PRODUCT_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMV_PR_CAT-PRODUCT_ID.
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_COMV_PR_CAT_STR, 
CLIENT TYPE STRING,
PRODUCT_GUID TYPE STRING,
CATEGORY_GUID TYPE STRING,
CATEGORY_ID TYPE STRING,
HIERARCHY_GUID TYPE STRING,
HIERARCHY_ID TYPE STRING,
LANGU TYPE STRING,
SHTEXT_LARGE TYPE STRING,
SHORT_TEXT TYPE STRING,
PRODUCT_ID TYPE STRING,
PRODUCT_TYPE TYPE STRING,
CONFIG TYPE STRING,
XNOSEARCH TYPE STRING,
OBJECT_FAMILY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMV_PR_CAT_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_COMV_PR_CAT_STR-CLIENT sy-vline 
WA_COMV_PR_CAT_STR-PRODUCT_GUID sy-vline 
WA_COMV_PR_CAT_STR-CATEGORY_GUID sy-vline 
WA_COMV_PR_CAT_STR-CATEGORY_ID sy-vline 
WA_COMV_PR_CAT_STR-HIERARCHY_GUID sy-vline 
WA_COMV_PR_CAT_STR-HIERARCHY_ID sy-vline 
WA_COMV_PR_CAT_STR-LANGU sy-vline 
WA_COMV_PR_CAT_STR-SHTEXT_LARGE sy-vline 
WA_COMV_PR_CAT_STR-SHORT_TEXT sy-vline 
WA_COMV_PR_CAT_STR-PRODUCT_ID sy-vline 
WA_COMV_PR_CAT_STR-PRODUCT_TYPE sy-vline 
WA_COMV_PR_CAT_STR-CONFIG sy-vline 
WA_COMV_PR_CAT_STR-XNOSEARCH sy-vline 
WA_COMV_PR_CAT_STR-OBJECT_FAMILY sy-vline      INTO ld_text SEPARATED BY SPACE.

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