ABAP Select data from SAP table VALUE_COMB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VALUE_COMB
*  INTO TABLE @DATA(IT_VALUE_COMB2).
*--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_VALUE_COMB INDEX 1 INTO DATA(WA_VALUE_COMB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VALUE_COMB>-YINDEX = 1.
<VALUE_COMB>-XINDEX = 1.
<VALUE_COMB>-STATU = 1.
<VALUE_COMB>-EMENGE = 1.
<VALUE_COMB>-AMENGE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VALUE_COMB-EPREIS, sy-vline,
  WA_VALUE_COMB-APREIS, sy-vline,
  WA_VALUE_COMB-EEWAHR, sy-vline,
  WA_VALUE_COMB-AEWAHR, sy-vline,
  WA_VALUE_COMB-CUOBJ, sy-vline,
  WA_VALUE_COMB-NTROBJ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VALUE_COMB 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_VALUE_COMB 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_VALUE_COMB INTO WA_VALUE_COMB.


*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_VALUE_COMB_STR, 
YINDEX TYPE STRING,
XINDEX TYPE STRING,
STATU TYPE STRING,
EMENGE TYPE STRING,
AMENGE TYPE STRING,
EPREIS TYPE STRING,
APREIS TYPE STRING,
EEWAHR TYPE STRING,
AEWAHR TYPE STRING,
CUOBJ TYPE STRING,
NTROBJ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VALUE_COMB_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_VALUE_COMB_STR-YINDEX sy-vline 
WA_VALUE_COMB_STR-XINDEX sy-vline 
WA_VALUE_COMB_STR-STATU sy-vline 
WA_VALUE_COMB_STR-EMENGE sy-vline 
WA_VALUE_COMB_STR-AMENGE sy-vline 
WA_VALUE_COMB_STR-EPREIS sy-vline 
WA_VALUE_COMB_STR-APREIS sy-vline 
WA_VALUE_COMB_STR-EEWAHR sy-vline 
WA_VALUE_COMB_STR-AEWAHR sy-vline 
WA_VALUE_COMB_STR-CUOBJ sy-vline 
WA_VALUE_COMB_STR-NTROBJ sy-vline      INTO ld_text SEPARATED BY SPACE.

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