ABAP Select data from SAP table VNWCH150 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VNWCH150 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 VNWCH150. 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 VNWCH150 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_VNWCH150 TYPE STANDARD TABLE OF VNWCH150,
      WA_VNWCH150 TYPE VNWCH150,
      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: <VNWCH150> TYPE VNWCH150.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VNWCH150.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VNWCH150
  INTO TABLE IT_VNWCH150.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWCH150
*  INTO TABLE @DATA(IT_VNWCH1502).
*--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_VNWCH150 INDEX 1 INTO DATA(WA_VNWCH1502).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VNWCH150 ASSIGNING <VNWCH150>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWCH150>-MANDT = 1.
<VNWCH150>-EINRI = 1.
<VNWCH150>-FALNR = 1.
<VNWCH150>-LNRLS = 1.
<VNWCH150>-ZMID = 1.

ENDLOOP.

LOOP AT IT_VNWCH150 INTO WA_VNWCH150.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWCH150-LFDNR, sy-vline,
  WA_VNWCH150-ZMDATE, sy-vline,
  WA_VNWCH150-ZMTIME, sy-vline,
  WA_VNWCH150-ERDAT, sy-vline,
  WA_VNWCH150-ERUSR, sy-vline,
  WA_VNWCH150-UPDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWCH150 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_VNWCH150 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_VNWCH150 INTO WA_VNWCH150.


*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_VNWCH150-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH150-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH150-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH150-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCH150-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCH150-LNRLS.
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_VNWCH150_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LNRLS TYPE STRING,
ZMID TYPE STRING,
LFDNR TYPE STRING,
ZMDATE TYPE STRING,
ZMTIME TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWCH150_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_VNWCH150_STR-MANDT sy-vline 
WA_VNWCH150_STR-EINRI sy-vline 
WA_VNWCH150_STR-FALNR sy-vline 
WA_VNWCH150_STR-LNRLS sy-vline 
WA_VNWCH150_STR-ZMID sy-vline 
WA_VNWCH150_STR-LFDNR sy-vline 
WA_VNWCH150_STR-ZMDATE sy-vline 
WA_VNWCH150_STR-ZMTIME sy-vline 
WA_VNWCH150_STR-ERDAT sy-vline 
WA_VNWCH150_STR-ERUSR sy-vline 
WA_VNWCH150_STR-UPDAT sy-vline 
WA_VNWCH150_STR-UPUSR sy-vline 
WA_VNWCH150_STR-STORN sy-vline 
WA_VNWCH150_STR-STUSR sy-vline 
WA_VNWCH150_STR-STDAT sy-vline 
WA_VNWCH150_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.