ABAP Select data from SAP table VCAWN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VCAWN
*  INTO TABLE @DATA(IT_VCAWN2).
*--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_VCAWN INDEX 1 INTO DATA(WA_VCAWN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VCAWN>-MANDT = 1.
<VCAWN>-ATINN = 1.
<VCAWN>-ATZHL = 1.
<VCAWN>-ADZHL = 1.
<VCAWN>-ATWRT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VCAWN-ATFLV, sy-vline,
  WA_VCAWN-ATFLB, sy-vline,
  WA_VCAWN-ATCOD, sy-vline,
  WA_VCAWN-ATSTD, sy-vline,
  WA_VCAWN-ATAWE, sy-vline,
  WA_VCAWN-ATAW1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VCAWN 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_VCAWN 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_VCAWN INTO WA_VCAWN.


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

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

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

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_VCAWN-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VCAWN-SPRAS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VCAWN-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VCAWN-DOKNR.
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_VCAWN_STR, 
MANDT TYPE STRING,
ATINN TYPE STRING,
ATZHL TYPE STRING,
ADZHL TYPE STRING,
ATWRT TYPE STRING,
ATFLV TYPE STRING,
ATFLB TYPE STRING,
ATCOD TYPE STRING,
ATSTD TYPE STRING,
ATAWE TYPE STRING,
ATAW1 TYPE STRING,
ATIDN TYPE STRING,
SPRAS TYPE STRING,
TXTNR TYPE STRING,
DATUV TYPE STRING,
TECHV TYPE STRING,
AENNR TYPE STRING,
LKENZ TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
ATZHH TYPE STRING,
KNOBJ TYPE STRING,
ATWHI TYPE STRING,
ATTLV TYPE STRING,
ATTLB TYPE STRING,
ATPRZ TYPE STRING,
ATINC TYPE STRING,
ATVPL TYPE STRING,
DATUB TYPE STRING,
DEC_FROM TYPE STRING,
DEC_TO TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
TIME_FROM TYPE STRING,
TIME_TO TYPE STRING,
CURR_FROM TYPE STRING,
CURR_TO TYPE STRING,
CURRENCY TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VCAWN_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_VCAWN_STR-MANDT sy-vline 
WA_VCAWN_STR-ATINN sy-vline 
WA_VCAWN_STR-ATZHL sy-vline 
WA_VCAWN_STR-ADZHL sy-vline 
WA_VCAWN_STR-ATWRT sy-vline 
WA_VCAWN_STR-ATFLV sy-vline 
WA_VCAWN_STR-ATFLB sy-vline 
WA_VCAWN_STR-ATCOD sy-vline 
WA_VCAWN_STR-ATSTD sy-vline 
WA_VCAWN_STR-ATAWE sy-vline 
WA_VCAWN_STR-ATAW1 sy-vline 
WA_VCAWN_STR-ATIDN sy-vline 
WA_VCAWN_STR-SPRAS sy-vline 
WA_VCAWN_STR-TXTNR sy-vline 
WA_VCAWN_STR-DATUV sy-vline 
WA_VCAWN_STR-TECHV sy-vline 
WA_VCAWN_STR-AENNR sy-vline 
WA_VCAWN_STR-LKENZ sy-vline 
WA_VCAWN_STR-DOKAR sy-vline 
WA_VCAWN_STR-DOKNR sy-vline 
WA_VCAWN_STR-DOKVR sy-vline 
WA_VCAWN_STR-DOKTL sy-vline 
WA_VCAWN_STR-ATZHH sy-vline 
WA_VCAWN_STR-KNOBJ sy-vline 
WA_VCAWN_STR-ATWHI sy-vline 
WA_VCAWN_STR-ATTLV sy-vline 
WA_VCAWN_STR-ATTLB sy-vline 
WA_VCAWN_STR-ATPRZ sy-vline 
WA_VCAWN_STR-ATINC sy-vline 
WA_VCAWN_STR-ATVPL sy-vline 
WA_VCAWN_STR-DATUB sy-vline 
WA_VCAWN_STR-DEC_FROM sy-vline 
WA_VCAWN_STR-DEC_TO sy-vline 
WA_VCAWN_STR-DATE_FROM sy-vline 
WA_VCAWN_STR-DATE_TO sy-vline 
WA_VCAWN_STR-TIME_FROM sy-vline 
WA_VCAWN_STR-TIME_TO sy-vline 
WA_VCAWN_STR-CURR_FROM sy-vline 
WA_VCAWN_STR-CURR_TO sy-vline 
WA_VCAWN_STR-CURRENCY sy-vline 
WA_VCAWN_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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