ABAP Select data from SAP table /BEV3/CH_KOMVD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /BEV3/CH_KOMVD 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 /BEV3/CH_KOMVD. 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 /BEV3/CH_KOMVD 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_/BEV3/CH_KOMVD TYPE STANDARD TABLE OF /BEV3/CH_KOMVD,
      WA_/BEV3/CH_KOMVD TYPE /BEV3/CH_KOMVD,
      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: </BEV3/CH_KOMVD> TYPE /BEV3/CH_KOMVD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/BEV3/CH_KOMVD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /BEV3/CH_KOMVD
  INTO TABLE IT_/BEV3/CH_KOMVD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /BEV3/CH_KOMVD
*  INTO TABLE @DATA(IT_/BEV3/CH_KOMVD2).
*--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_/BEV3/CH_KOMVD INDEX 1 INTO DATA(WA_/BEV3/CH_KOMVD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/BEV3/CH_KOMVD ASSIGNING </BEV3/CH_KOMVD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</BEV3/CH_KOMVD>-KPOSN = 1.
</BEV3/CH_KOMVD>-STUNR = 1.
</BEV3/CH_KOMVD>-ZAEHK = 1.
</BEV3/CH_KOMVD>-KAPPL = 1.
</BEV3/CH_KOMVD>-KSCHL = 1.

ENDLOOP.

LOOP AT IT_/BEV3/CH_KOMVD INTO WA_/BEV3/CH_KOMVD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/BEV3/CH_KOMVD-KRECH, sy-vline,
  WA_/BEV3/CH_KOMVD-KAWRT, sy-vline,
  WA_/BEV3/CH_KOMVD-AWEIN, sy-vline,
  WA_/BEV3/CH_KOMVD-AWEI1, sy-vline,
  WA_/BEV3/CH_KOMVD-KBETR, sy-vline,
  WA_/BEV3/CH_KOMVD-KOEIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/BEV3/CH_KOMVD 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_/BEV3/CH_KOMVD 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_/BEV3/CH_KOMVD INTO WA_/BEV3/CH_KOMVD.


*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 EXCRT, internal->external for field KKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_/BEV3/CH_KOMVD-KKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BEV3/CH_KOMVD-KKURS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/BEV3/CH_KOMVD-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BEV3/CH_KOMVD-KMEIN.
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_/BEV3/CH_KOMVD_STR, 
KPOSN TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KRECH TYPE STRING,
KAWRT TYPE STRING,
AWEIN TYPE STRING,
AWEI1 TYPE STRING,
KBETR TYPE STRING,
KOEIN TYPE STRING,
KOEI1 TYPE STRING,
KKURS TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
KUMZA TYPE STRING,
KUMNE TYPE STRING,
KNTYP TYPE STRING,
KSTAT TYPE STRING,
KHERK TYPE STRING,
KWERT TYPE STRING,
KSTEU TYPE STRING,
KINAK TYPE STRING,
KOAID TYPE STRING,
KNUMT TYPE STRING,
DRUKZ TYPE STRING,
VTEXT TYPE STRING,
STUFE TYPE STRING,
WEGXX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/BEV3/CH_KOMVD_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_/BEV3/CH_KOMVD_STR-KPOSN sy-vline 
WA_/BEV3/CH_KOMVD_STR-STUNR sy-vline 
WA_/BEV3/CH_KOMVD_STR-ZAEHK sy-vline 
WA_/BEV3/CH_KOMVD_STR-KAPPL sy-vline 
WA_/BEV3/CH_KOMVD_STR-KSCHL sy-vline 
WA_/BEV3/CH_KOMVD_STR-KRECH sy-vline 
WA_/BEV3/CH_KOMVD_STR-KAWRT sy-vline 
WA_/BEV3/CH_KOMVD_STR-AWEIN sy-vline 
WA_/BEV3/CH_KOMVD_STR-AWEI1 sy-vline 
WA_/BEV3/CH_KOMVD_STR-KBETR sy-vline 
WA_/BEV3/CH_KOMVD_STR-KOEIN sy-vline 
WA_/BEV3/CH_KOMVD_STR-KOEI1 sy-vline 
WA_/BEV3/CH_KOMVD_STR-KKURS sy-vline 
WA_/BEV3/CH_KOMVD_STR-KPEIN sy-vline 
WA_/BEV3/CH_KOMVD_STR-KMEIN sy-vline 
WA_/BEV3/CH_KOMVD_STR-KUMZA sy-vline 
WA_/BEV3/CH_KOMVD_STR-KUMNE sy-vline 
WA_/BEV3/CH_KOMVD_STR-KNTYP sy-vline 
WA_/BEV3/CH_KOMVD_STR-KSTAT sy-vline 
WA_/BEV3/CH_KOMVD_STR-KHERK sy-vline 
WA_/BEV3/CH_KOMVD_STR-KWERT sy-vline 
WA_/BEV3/CH_KOMVD_STR-KSTEU sy-vline 
WA_/BEV3/CH_KOMVD_STR-KINAK sy-vline 
WA_/BEV3/CH_KOMVD_STR-KOAID sy-vline 
WA_/BEV3/CH_KOMVD_STR-KNUMT sy-vline 
WA_/BEV3/CH_KOMVD_STR-DRUKZ sy-vline 
WA_/BEV3/CH_KOMVD_STR-VTEXT sy-vline 
WA_/BEV3/CH_KOMVD_STR-STUFE sy-vline 
WA_/BEV3/CH_KOMVD_STR-WEGXX sy-vline      INTO ld_text SEPARATED BY SPACE.

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