ABAP Select data from SAP table COMW_EXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP COMW_EXT 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_EXT. 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_EXT 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_EXT TYPE STANDARD TABLE OF COMW_EXT,
      WA_COMW_EXT TYPE COMW_EXT,
      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_EXT> TYPE COMW_EXT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMW_EXT
*  INTO TABLE @DATA(IT_COMW_EXT2).
*--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_EXT INDEX 1 INTO DATA(WA_COMW_EXT2).


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

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

ENDLOOP.

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

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


*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_EXT-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMW_EXT-ATINN.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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