ABAP Select data from SAP table VNWCH90 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VNWCH90 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 VNWCH90. 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 VNWCH90 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_VNWCH90 TYPE STANDARD TABLE OF VNWCH90,
      WA_VNWCH90 TYPE VNWCH90,
      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: <VNWCH90> TYPE VNWCH90.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VNWCH90.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VNWCH90
  INTO TABLE IT_VNWCH90.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWCH90
*  INTO TABLE @DATA(IT_VNWCH902).
*--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_VNWCH90 INDEX 1 INTO DATA(WA_VNWCH902).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VNWCH90 ASSIGNING <VNWCH90>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWCH90>-MANDT = 1.
<VNWCH90>-EINRI = 1.
<VNWCH90>-LFDNR = 1.
<VNWCH90>-FALNR = 1.
<VNWCH90>-LNRLS = 1.

ENDLOOP.

LOOP AT IT_VNWCH90 INTO WA_VNWCH90.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWCH90-ARZT, sy-vline,
  WA_VNWCH90-HONART, sy-vline,
  WA_VNWCH90-HONUGR, sy-vline,
  WA_VNWCH90-ROLLE, sy-vline,
  WA_VNWCH90-BETRAG, sy-vline,
  WA_VNWCH90-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWCH90 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_VNWCH90 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_VNWCH90 INTO WA_VNWCH90.


*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 ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LFDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-LFDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-LFDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ARZT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-ARZT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-ARZT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ROLLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-ROLLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-ROLLE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECHNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-RECHNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-RECHNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERRKTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-VERRKTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-VERRKTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIMIT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH90-LIMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH90-LIMIT.
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_VNWCH90_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
LFDNR TYPE STRING,
FALNR TYPE STRING,
LNRLS TYPE STRING,
ARZT TYPE STRING,
HONART TYPE STRING,
HONUGR TYPE STRING,
ROLLE TYPE STRING,
BETRAG TYPE STRING,
WAERS TYPE STRING,
STATUS TYPE STRING,
AUFTCDE TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
FGUSR TYPE STRING,
UEBDAT TYPE STRING,
BEMERK TYPE STRING,
RECHNR TYPE STRING,
KOSTL TYPE STRING,
ERBDAT TYPE STRING,
SPERRE TYPE STRING,
BUKRS TYPE STRING,
VERRKTO TYPE STRING,
FALAI TYPE STRING,
CLASS TYPE STRING,
LIMIT TYPE STRING,
ABSCHR TYPE STRING,
ABDAT TYPE STRING,
ABUSR TYPE STRING,
UBLDAT TYPE STRING,
UBLUSR TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWCH90_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_VNWCH90_STR-MANDT sy-vline 
WA_VNWCH90_STR-EINRI sy-vline 
WA_VNWCH90_STR-LFDNR sy-vline 
WA_VNWCH90_STR-FALNR sy-vline 
WA_VNWCH90_STR-LNRLS sy-vline 
WA_VNWCH90_STR-ARZT sy-vline 
WA_VNWCH90_STR-HONART sy-vline 
WA_VNWCH90_STR-HONUGR sy-vline 
WA_VNWCH90_STR-ROLLE sy-vline 
WA_VNWCH90_STR-BETRAG sy-vline 
WA_VNWCH90_STR-WAERS sy-vline 
WA_VNWCH90_STR-STATUS sy-vline 
WA_VNWCH90_STR-AUFTCDE sy-vline 
WA_VNWCH90_STR-ERDAT sy-vline 
WA_VNWCH90_STR-ERUSR sy-vline 
WA_VNWCH90_STR-UPDAT sy-vline 
WA_VNWCH90_STR-UPUSR sy-vline 
WA_VNWCH90_STR-FGUSR sy-vline 
WA_VNWCH90_STR-UEBDAT sy-vline 
WA_VNWCH90_STR-BEMERK sy-vline 
WA_VNWCH90_STR-RECHNR sy-vline 
WA_VNWCH90_STR-KOSTL sy-vline 
WA_VNWCH90_STR-ERBDAT sy-vline 
WA_VNWCH90_STR-SPERRE sy-vline 
WA_VNWCH90_STR-BUKRS sy-vline 
WA_VNWCH90_STR-VERRKTO sy-vline 
WA_VNWCH90_STR-FALAI sy-vline 
WA_VNWCH90_STR-CLASS sy-vline 
WA_VNWCH90_STR-LIMIT sy-vline 
WA_VNWCH90_STR-ABSCHR sy-vline 
WA_VNWCH90_STR-ABDAT sy-vline 
WA_VNWCH90_STR-ABUSR sy-vline 
WA_VNWCH90_STR-UBLDAT sy-vline 
WA_VNWCH90_STR-UBLUSR sy-vline 
WA_VNWCH90_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.