ABAP Select data from SAP table COMW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMW
*  INTO TABLE @DATA(IT_COMW2).
*--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_COMW INDEX 1 INTO DATA(WA_COMW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMW>-ATINN = 1.
<COMW>-ATZHL = 1.
<COMW>-ATWRT = 1.
<COMW>-ATFLV = 1.
<COMW>-ATAWE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMW-ATFLB, sy-vline,
  WA_COMW-ATAW1, sy-vline,
  WA_COMW-ATCOD, sy-vline,
  WA_COMW-ATTLV, sy-vline,
  WA_COMW-ATTLB, sy-vline,
  WA_COMW-ATPRZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMW 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_COMW 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_COMW INTO WA_COMW.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_COMW-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMW-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ATAWE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COMW-ATAWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMW-ATAWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ATAW1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COMW-ATAW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMW-ATAW1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ATINN, internal->external for field ATIMB
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_COMW-ATIMB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMW-ATIMB.
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_COMW_STR, 
ATINN TYPE STRING,
ATZHL TYPE STRING,
ATWRT TYPE STRING,
ATFLV TYPE STRING,
ATAWE TYPE STRING,
ATFLB TYPE STRING,
ATAW1 TYPE STRING,
ATCOD TYPE STRING,
ATTLV TYPE STRING,
ATTLB TYPE STRING,
ATPRZ TYPE STRING,
ATINC TYPE STRING,
ATAUT TYPE STRING,
STATU TYPE STRING,
ATFOR TYPE STRING,
SLWRT TYPE STRING,
SLFLV TYPE STRING,
SLFLB TYPE STRING,
SLCOD TYPE STRING,
ATTAB TYPE STRING,
ATFEL TYPE STRING,
KZRED TYPE STRING,
OMADD TYPE STRING,
MMERB TYPE STRING,
ATEIN TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
CATWRT TYPE STRING,
CATFLV TYPE STRING,
ATIMB TYPE STRING,
ATZIS TYPE STRING,
ATSRT TYPE STRING,
ATVGLART TYPE STRING,
ADZHL TYPE STRING,
EST_ATWRT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMW_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_COMW_STR-ATINN sy-vline 
WA_COMW_STR-ATZHL sy-vline 
WA_COMW_STR-ATWRT sy-vline 
WA_COMW_STR-ATFLV sy-vline 
WA_COMW_STR-ATAWE sy-vline 
WA_COMW_STR-ATFLB sy-vline 
WA_COMW_STR-ATAW1 sy-vline 
WA_COMW_STR-ATCOD sy-vline 
WA_COMW_STR-ATTLV sy-vline 
WA_COMW_STR-ATTLB sy-vline 
WA_COMW_STR-ATPRZ sy-vline 
WA_COMW_STR-ATINC sy-vline 
WA_COMW_STR-ATAUT sy-vline 
WA_COMW_STR-STATU sy-vline 
WA_COMW_STR-ATFOR sy-vline 
WA_COMW_STR-SLWRT sy-vline 
WA_COMW_STR-SLFLV sy-vline 
WA_COMW_STR-SLFLB sy-vline 
WA_COMW_STR-SLCOD sy-vline 
WA_COMW_STR-ATTAB sy-vline 
WA_COMW_STR-ATFEL sy-vline 
WA_COMW_STR-KZRED sy-vline 
WA_COMW_STR-OMADD sy-vline 
WA_COMW_STR-MMERB sy-vline 
WA_COMW_STR-ATEIN sy-vline 
WA_COMW_STR-AENNR sy-vline 
WA_COMW_STR-DATUV sy-vline 
WA_COMW_STR-CATWRT sy-vline 
WA_COMW_STR-CATFLV sy-vline 
WA_COMW_STR-ATIMB sy-vline 
WA_COMW_STR-ATZIS sy-vline 
WA_COMW_STR-ATSRT sy-vline 
WA_COMW_STR-ATVGLART sy-vline 
WA_COMW_STR-ADZHL sy-vline 
WA_COMW_STR-EST_ATWRT sy-vline      INTO ld_text SEPARATED BY SPACE.

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