ABAP Select data from SAP table VNWCHPSY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWCHPSY
*  INTO TABLE @DATA(IT_VNWCHPSY2).
*--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_VNWCHPSY INDEX 1 INTO DATA(WA_VNWCHPSY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWCHPSY>-MANDT = 1.
<VNWCHPSY>-EINRI = 1.
<VNWCHPSY>-FALNR = 1.
<VNWCHPSY>-PATNR = 1.
<VNWCHPSY>-TLERW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWCHPSY-VOERW, sy-vline,
  WA_VNWCHPSY-NIERW, sy-vline,
  WA_VNWCHPSY-HAUSH, sy-vline,
  WA_VNWCHPSY-AUSBI, sy-vline,
  WA_VNWCHPSY-REHAB, sy-vline,
  WA_VNWCHPSY-RENTE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWCHPSY 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_VNWCHPSY 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_VNWCHPSY INTO WA_VNWCHPSY.


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

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

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWCHPSY-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWCHPSY-PATNR.
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_VNWCHPSY_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
PATNR TYPE STRING,
TLERW TYPE STRING,
VOERW TYPE STRING,
NIERW TYPE STRING,
HAUSH TYPE STRING,
AUSBI TYPE STRING,
REHAB TYPE STRING,
RENTE TYPE STRING,
SCHUZ TYPE STRING,
UNERW TYPE STRING,
SCHUL TYPE STRING,
FREIW TYPE STRING,
FREIH TYPE STRING,
BHAND TYPE STRING,
NEURO TYPE STRING,
DEPOT TYPE STRING,
ADEPR TYPE STRING,
TRNQU TYPE STRING,
HYPNO TYPE STRING,
AEPIL TYPE STRING,
LITHM TYPE STRING,
SUBST TYPE STRING,
AVERS TYPE STRING,
APARK TYPE STRING,
APHRM TYPE STRING,
MEDKL TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
ERTIM TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
UPTIM TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWCHPSY_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_VNWCHPSY_STR-MANDT sy-vline 
WA_VNWCHPSY_STR-EINRI sy-vline 
WA_VNWCHPSY_STR-FALNR sy-vline 
WA_VNWCHPSY_STR-PATNR sy-vline 
WA_VNWCHPSY_STR-TLERW sy-vline 
WA_VNWCHPSY_STR-VOERW sy-vline 
WA_VNWCHPSY_STR-NIERW sy-vline 
WA_VNWCHPSY_STR-HAUSH sy-vline 
WA_VNWCHPSY_STR-AUSBI sy-vline 
WA_VNWCHPSY_STR-REHAB sy-vline 
WA_VNWCHPSY_STR-RENTE sy-vline 
WA_VNWCHPSY_STR-SCHUZ sy-vline 
WA_VNWCHPSY_STR-UNERW sy-vline 
WA_VNWCHPSY_STR-SCHUL sy-vline 
WA_VNWCHPSY_STR-FREIW sy-vline 
WA_VNWCHPSY_STR-FREIH sy-vline 
WA_VNWCHPSY_STR-BHAND sy-vline 
WA_VNWCHPSY_STR-NEURO sy-vline 
WA_VNWCHPSY_STR-DEPOT sy-vline 
WA_VNWCHPSY_STR-ADEPR sy-vline 
WA_VNWCHPSY_STR-TRNQU sy-vline 
WA_VNWCHPSY_STR-HYPNO sy-vline 
WA_VNWCHPSY_STR-AEPIL sy-vline 
WA_VNWCHPSY_STR-LITHM sy-vline 
WA_VNWCHPSY_STR-SUBST sy-vline 
WA_VNWCHPSY_STR-AVERS sy-vline 
WA_VNWCHPSY_STR-APARK sy-vline 
WA_VNWCHPSY_STR-APHRM sy-vline 
WA_VNWCHPSY_STR-MEDKL sy-vline 
WA_VNWCHPSY_STR-ERDAT sy-vline 
WA_VNWCHPSY_STR-ERUSR sy-vline 
WA_VNWCHPSY_STR-ERTIM sy-vline 
WA_VNWCHPSY_STR-UPDAT sy-vline 
WA_VNWCHPSY_STR-UPUSR sy-vline 
WA_VNWCHPSY_STR-UPTIM sy-vline 
WA_VNWCHPSY_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.