ABAP Select data from SAP table VNWATTRISS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWATTRISS
*  INTO TABLE @DATA(IT_VNWATTRISS2).
*--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_VNWATTRISS INDEX 1 INTO DATA(WA_VNWATTRISS2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWATTRISS-ACTINTNR, sy-vline,
  WA_VNWATTRISS-ABDOMEN, sy-vline,
  WA_VNWATTRISS-EXTERN, sy-vline,
  WA_VNWATTRISS-EXTREMIT, sy-vline,
  WA_VNWATTRISS-GESICHT, sy-vline,
  WA_VNWATTRISS-HALSKOPF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWATTRISS 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_VNWATTRISS 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_VNWATTRISS INTO WA_VNWATTRISS.


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

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWATTRISS-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWATTRISS-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_VNWATTRISS_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
INTNR TYPE STRING,
ACTINTNR TYPE STRING,
ABDOMEN TYPE STRING,
EXTERN TYPE STRING,
EXTREMIT TYPE STRING,
GESICHT TYPE STRING,
HALSKOPF TYPE STRING,
THORAX TYPE STRING,
TYP TYPE STRING,
MOTOREAK TYPE STRING,
VERBALE TYPE STRING,
VISUELLE TYPE STRING,
SYSTOL TYPE STRING,
SYSTOL_I TYPE STRING,
ATEMFRE 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,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWATTRISS_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_VNWATTRISS_STR-MANDT sy-vline 
WA_VNWATTRISS_STR-EINRI sy-vline 
WA_VNWATTRISS_STR-FALNR sy-vline 
WA_VNWATTRISS_STR-LFDNR sy-vline 
WA_VNWATTRISS_STR-INTNR sy-vline 
WA_VNWATTRISS_STR-ACTINTNR sy-vline 
WA_VNWATTRISS_STR-ABDOMEN sy-vline 
WA_VNWATTRISS_STR-EXTERN sy-vline 
WA_VNWATTRISS_STR-EXTREMIT sy-vline 
WA_VNWATTRISS_STR-GESICHT sy-vline 
WA_VNWATTRISS_STR-HALSKOPF sy-vline 
WA_VNWATTRISS_STR-THORAX sy-vline 
WA_VNWATTRISS_STR-TYP sy-vline 
WA_VNWATTRISS_STR-MOTOREAK sy-vline 
WA_VNWATTRISS_STR-VERBALE sy-vline 
WA_VNWATTRISS_STR-VISUELLE sy-vline 
WA_VNWATTRISS_STR-SYSTOL sy-vline 
WA_VNWATTRISS_STR-SYSTOL_I sy-vline 
WA_VNWATTRISS_STR-ATEMFRE sy-vline 
WA_VNWATTRISS_STR-ERDAT sy-vline 
WA_VNWATTRISS_STR-ERTIM sy-vline 
WA_VNWATTRISS_STR-ERUSR sy-vline 
WA_VNWATTRISS_STR-UPDAT sy-vline 
WA_VNWATTRISS_STR-UPTIM sy-vline 
WA_VNWATTRISS_STR-UPUSR sy-vline 
WA_VNWATTRISS_STR-STORN sy-vline 
WA_VNWATTRISS_STR-STDAT sy-vline 
WA_VNWATTRISS_STR-STUSR sy-vline 
WA_VNWATTRISS_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.