ABAP Select data from SAP table VLCKOMB into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VLCKOMB 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 VLCKOMB. 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 VLCKOMB 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_VLCKOMB TYPE STANDARD TABLE OF VLCKOMB,
      WA_VLCKOMB TYPE VLCKOMB,
      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: <VLCKOMB> TYPE VLCKOMB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VLCKOMB
*  INTO TABLE @DATA(IT_VLCKOMB2).
*--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_VLCKOMB INDEX 1 INTO DATA(WA_VLCKOMB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VLCKOMB>-VHUSG = 1.
<VLCKOMB>-AVAIL = 1.
<VLCKOMB>-CSTRMONTH = 1.
<VLCKOMB>-CSTRYEAR = 1.
<VLCKOMB>-ENDCU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VLCKOMB-EQUNR, sy-vline,
  WA_VLCKOMB-LOCTN, sy-vline,
  WA_VLCKOMB-VBLTY, sy-vline,
  WA_VLCKOMB-VESEA, sy-vline,
  WA_VLCKOMB-VGUID, sy-vline,
  WA_VLCKOMB-VHCEX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VLCKOMB 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_VLCKOMB 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_VLCKOMB INTO WA_VLCKOMB.


*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 GJAHR, internal->external for field CSTRYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_VLCKOMB-CSTRYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCKOMB-CSTRYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENDCU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VLCKOMB-ENDCU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCKOMB-ENDCU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VLCKOMB-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCKOMB-EQUNR.
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_VLCKOMB_STR, 
VHUSG TYPE STRING,
AVAIL TYPE STRING,
CSTRMONTH TYPE STRING,
CSTRYEAR TYPE STRING,
ENDCU TYPE STRING,
EQUNR TYPE STRING,
LOCTN TYPE STRING,
VBLTY TYPE STRING,
VESEA TYPE STRING,
VGUID TYPE STRING,
VHCEX TYPE STRING,
VHCLE TYPE STRING,
VHVIN TYPE STRING,
ACTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VLCKOMB_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_VLCKOMB_STR-VHUSG sy-vline 
WA_VLCKOMB_STR-AVAIL sy-vline 
WA_VLCKOMB_STR-CSTRMONTH sy-vline 
WA_VLCKOMB_STR-CSTRYEAR sy-vline 
WA_VLCKOMB_STR-ENDCU sy-vline 
WA_VLCKOMB_STR-EQUNR sy-vline 
WA_VLCKOMB_STR-LOCTN sy-vline 
WA_VLCKOMB_STR-VBLTY sy-vline 
WA_VLCKOMB_STR-VESEA sy-vline 
WA_VLCKOMB_STR-VGUID sy-vline 
WA_VLCKOMB_STR-VHCEX sy-vline 
WA_VLCKOMB_STR-VHCLE sy-vline 
WA_VLCKOMB_STR-VHVIN sy-vline 
WA_VLCKOMB_STR-ACTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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