ABAP Select data from SAP table VNWATTISS28 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VNWATTISS28 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 VNWATTISS28. 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 VNWATTISS28 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_VNWATTISS28 TYPE STANDARD TABLE OF VNWATTISS28,
      WA_VNWATTISS28 TYPE VNWATTISS28,
      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: <VNWATTISS28> TYPE VNWATTISS28.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VNWATTISS28.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VNWATTISS28
  INTO TABLE IT_VNWATTISS28.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWATTISS28
*  INTO TABLE @DATA(IT_VNWATTISS282).
*--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_VNWATTISS28 INDEX 1 INTO DATA(WA_VNWATTISS282).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VNWATTISS28 ASSIGNING <VNWATTISS28>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWATTISS28>-MANDT = 1.
<VNWATTISS28>-EINRI = 1.
<VNWATTISS28>-FALNR = 1.
<VNWATTISS28>-LFDNR = 1.
<VNWATTISS28>-INTNR = 1.

ENDLOOP.

LOOP AT IT_VNWATTISS28 INTO WA_VNWATTISS28.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWATTISS28-ACTINTNR, sy-vline,
  WA_VNWATTISS28-ERHDT, sy-vline,
  WA_VNWATTISS28-STANMON, sy-vline,
  WA_VNWATTISS28-LABOR, sy-vline,
  WA_VNWATTISS28-MEDIKE, sy-vline,
  WA_VNWATTISS28-MEDIKM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWATTISS28 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_VNWATTISS28 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_VNWATTISS28 INTO WA_VNWATTISS28.


*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_VNWATTISS28-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWATTISS28-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWATTISS28-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWATTISS28-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_VNWATTISS28_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
INTNR TYPE STRING,
ACTINTNR TYPE STRING,
ERHDT TYPE STRING,
STANMON TYPE STRING,
LABOR TYPE STRING,
MEDIKE TYPE STRING,
MEDIKM TYPE STRING,
VERBANDR TYPE STRING,
VERBANDH TYPE STRING,
DRAINAG TYPE STRING,
ATMUNGM TYPE STRING,
ATMUNGU TYPE STRING,
TUBSTOM TYPE STRING,
ATEMTHER TYPE STRING,
VASOMEDIE TYPE STRING,
VASOMEDIM TYPE STRING,
MASFL TYPE STRING,
ARTHKATH TYPE STRING,
PULMONAL TYPE STRING,
ZENKATH TYPE STRING,
KARDIO TYPE STRING,
NIERERS TYPE STRING,
HARNBIL TYPE STRING,
AKTDIU TYPE STRING,
HIRNDR TYPE STRING,
METABENT TYPE STRING,
ERNENT TYPE STRING,
ERNPAR TYPE STRING,
INTEREIN TYPE STRING,
INTERME TYPE STRING,
DIAGTHER 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,
MEDIKA TYPE STRING,
VERBANDW TYPE STRING,
ATMMOD TYPE STRING,
ATEMWEG TYPE STRING,
MEDIVASO TYPE STRING,
MONHAEMO TYPE STRING,
INTERVEN TYPE STRING,
AGIDELI TYPE STRING,
ASSKARDI TYPE STRING,
ASSPULMO TYPE STRING,
HYPOTHERA TYPE STRING,
LEBERSUP TYPE STRING,
INTRAVTH TYPE STRING,
TIMESTAMP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWATTISS28_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_VNWATTISS28_STR-MANDT sy-vline 
WA_VNWATTISS28_STR-EINRI sy-vline 
WA_VNWATTISS28_STR-FALNR sy-vline 
WA_VNWATTISS28_STR-LFDNR sy-vline 
WA_VNWATTISS28_STR-INTNR sy-vline 
WA_VNWATTISS28_STR-ACTINTNR sy-vline 
WA_VNWATTISS28_STR-ERHDT sy-vline 
WA_VNWATTISS28_STR-STANMON sy-vline 
WA_VNWATTISS28_STR-LABOR sy-vline 
WA_VNWATTISS28_STR-MEDIKE sy-vline 
WA_VNWATTISS28_STR-MEDIKM sy-vline 
WA_VNWATTISS28_STR-VERBANDR sy-vline 
WA_VNWATTISS28_STR-VERBANDH sy-vline 
WA_VNWATTISS28_STR-DRAINAG sy-vline 
WA_VNWATTISS28_STR-ATMUNGM sy-vline 
WA_VNWATTISS28_STR-ATMUNGU sy-vline 
WA_VNWATTISS28_STR-TUBSTOM sy-vline 
WA_VNWATTISS28_STR-ATEMTHER sy-vline 
WA_VNWATTISS28_STR-VASOMEDIE sy-vline 
WA_VNWATTISS28_STR-VASOMEDIM sy-vline 
WA_VNWATTISS28_STR-MASFL sy-vline 
WA_VNWATTISS28_STR-ARTHKATH sy-vline 
WA_VNWATTISS28_STR-PULMONAL sy-vline 
WA_VNWATTISS28_STR-ZENKATH sy-vline 
WA_VNWATTISS28_STR-KARDIO sy-vline 
WA_VNWATTISS28_STR-NIERERS sy-vline 
WA_VNWATTISS28_STR-HARNBIL sy-vline 
WA_VNWATTISS28_STR-AKTDIU sy-vline 
WA_VNWATTISS28_STR-HIRNDR sy-vline 
WA_VNWATTISS28_STR-METABENT sy-vline 
WA_VNWATTISS28_STR-ERNENT sy-vline 
WA_VNWATTISS28_STR-ERNPAR sy-vline 
WA_VNWATTISS28_STR-INTEREIN sy-vline 
WA_VNWATTISS28_STR-INTERME sy-vline 
WA_VNWATTISS28_STR-DIAGTHER sy-vline 
WA_VNWATTISS28_STR-ERDAT sy-vline 
WA_VNWATTISS28_STR-ERTIM sy-vline 
WA_VNWATTISS28_STR-ERUSR sy-vline 
WA_VNWATTISS28_STR-UPDAT sy-vline 
WA_VNWATTISS28_STR-UPTIM sy-vline 
WA_VNWATTISS28_STR-UPUSR sy-vline 
WA_VNWATTISS28_STR-STORN sy-vline 
WA_VNWATTISS28_STR-STDAT sy-vline 
WA_VNWATTISS28_STR-STUSR sy-vline 
WA_VNWATTISS28_STR-MEDIKA sy-vline 
WA_VNWATTISS28_STR-VERBANDW sy-vline 
WA_VNWATTISS28_STR-ATMMOD sy-vline 
WA_VNWATTISS28_STR-ATEMWEG sy-vline 
WA_VNWATTISS28_STR-MEDIVASO sy-vline 
WA_VNWATTISS28_STR-MONHAEMO sy-vline 
WA_VNWATTISS28_STR-INTERVEN sy-vline 
WA_VNWATTISS28_STR-AGIDELI sy-vline 
WA_VNWATTISS28_STR-ASSKARDI sy-vline 
WA_VNWATTISS28_STR-ASSPULMO sy-vline 
WA_VNWATTISS28_STR-HYPOTHERA sy-vline 
WA_VNWATTISS28_STR-LEBERSUP sy-vline 
WA_VNWATTISS28_STR-INTRAVTH sy-vline 
WA_VNWATTISS28_STR-TIMESTAMP sy-vline 
WA_VNWATTISS28_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.