ABAP Select data from SAP table VNWATINTENS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWATINTENS
*  INTO TABLE @DATA(IT_VNWATINTENS2).
*--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_VNWATINTENS INDEX 1 INTO DATA(WA_VNWATINTENS2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWATINTENS-AUFART, sy-vline,
  WA_VNWATINTENS-AUFTYP, sy-vline,
  WA_VNWATINTENS-AIDS, sy-vline,
  WA_VNWATINTENS-METAST, sy-vline,
  WA_VNWATINTENS-HAEMAT, sy-vline,
  WA_VNWATINTENS-ENTDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWATINTENS 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_VNWATINTENS 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_VNWATINTENS INTO WA_VNWATINTENS.


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

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWATINTENS-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWATINTENS-FALNR.
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_VNWATINTENS_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
INTNR TYPE STRING,
AUFART TYPE STRING,
AUFTYP TYPE STRING,
AIDS TYPE STRING,
METAST TYPE STRING,
HAEMAT TYPE STRING,
ENTDT TYPE STRING,
ENTZT TYPE STRING,
ENTZUST TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STDAT TYPE STRING,
STUSR TYPE STRING,
MODELL TYPE STRING,
TIMESTAMP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWATINTENS_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_VNWATINTENS_STR-MANDT sy-vline 
WA_VNWATINTENS_STR-EINRI sy-vline 
WA_VNWATINTENS_STR-FALNR sy-vline 
WA_VNWATINTENS_STR-LFDNR sy-vline 
WA_VNWATINTENS_STR-INTNR sy-vline 
WA_VNWATINTENS_STR-AUFART sy-vline 
WA_VNWATINTENS_STR-AUFTYP sy-vline 
WA_VNWATINTENS_STR-AIDS sy-vline 
WA_VNWATINTENS_STR-METAST sy-vline 
WA_VNWATINTENS_STR-HAEMAT sy-vline 
WA_VNWATINTENS_STR-ENTDT sy-vline 
WA_VNWATINTENS_STR-ENTZT sy-vline 
WA_VNWATINTENS_STR-ENTZUST sy-vline 
WA_VNWATINTENS_STR-ERDAT sy-vline 
WA_VNWATINTENS_STR-ERTIM sy-vline 
WA_VNWATINTENS_STR-ERUSR sy-vline 
WA_VNWATINTENS_STR-UPDAT sy-vline 
WA_VNWATINTENS_STR-UPTIM sy-vline 
WA_VNWATINTENS_STR-UPUSR sy-vline 
WA_VNWATINTENS_STR-STORN sy-vline 
WA_VNWATINTENS_STR-STDAT sy-vline 
WA_VNWATINTENS_STR-STUSR sy-vline 
WA_VNWATINTENS_STR-MODELL sy-vline 
WA_VNWATINTENS_STR-TIMESTAMP sy-vline 
WA_VNWATINTENS_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.