ABAP Select data from SAP table VVISCSUREL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VVISCSUREL
*  INTO TABLE @DATA(IT_VVISCSUREL2).
*--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_VVISCSUREL INDEX 1 INTO DATA(WA_VVISCSUREL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VVISCSUREL>-MANDT = 1.
<VVISCSUREL>-INTRENOSRC = 1.
<VVISCSUREL>-INTRENOTRG = 1.
<VVISCSUREL>-VALIDFROM = 1.
<VVISCSUREL>-EQUIVNUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VVISCSUREL-VOLWATER, sy-vline,
  WA_VVISCSUREL-TEMPWATER, sy-vline,
  WA_VVISCSUREL-HEATVALUE, sy-vline,
  WA_VVISCSUREL-FUELTYPE, sy-vline,
  WA_VVISCSUREL-GCONSUMP, sy-vline,
  WA_VVISCSUREL-QHEATAMOUNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VVISCSUREL 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_VVISCSUREL 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_VVISCSUREL INTO WA_VVISCSUREL.


*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 MEAS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VVISCSUREL-MEAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VVISCSUREL-MEAS.
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_VVISCSUREL_STR, 
MANDT TYPE STRING,
INTRENOSRC TYPE STRING,
INTRENOTRG TYPE STRING,
VALIDFROM TYPE STRING,
EQUIVNUM TYPE STRING,
VOLWATER TYPE STRING,
TEMPWATER TYPE STRING,
HEATVALUE TYPE STRING,
FUELTYPE TYPE STRING,
GCONSUMP TYPE STRING,
QHEATAMOUNT TYPE STRING,
BCONSUMP TYPE STRING,
WHEATAMOUNT TYPE STRING,
WWPROZ TYPE STRING,
HKVOTYP TYPE STRING,
MEAS TYPE STRING,
METERFROMRO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VVISCSUREL_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_VVISCSUREL_STR-MANDT sy-vline 
WA_VVISCSUREL_STR-INTRENOSRC sy-vline 
WA_VVISCSUREL_STR-INTRENOTRG sy-vline 
WA_VVISCSUREL_STR-VALIDFROM sy-vline 
WA_VVISCSUREL_STR-EQUIVNUM sy-vline 
WA_VVISCSUREL_STR-VOLWATER sy-vline 
WA_VVISCSUREL_STR-TEMPWATER sy-vline 
WA_VVISCSUREL_STR-HEATVALUE sy-vline 
WA_VVISCSUREL_STR-FUELTYPE sy-vline 
WA_VVISCSUREL_STR-GCONSUMP sy-vline 
WA_VVISCSUREL_STR-QHEATAMOUNT sy-vline 
WA_VVISCSUREL_STR-BCONSUMP sy-vline 
WA_VVISCSUREL_STR-WHEATAMOUNT sy-vline 
WA_VVISCSUREL_STR-WWPROZ sy-vline 
WA_VVISCSUREL_STR-HKVOTYP sy-vline 
WA_VVISCSUREL_STR-MEAS sy-vline 
WA_VVISCSUREL_STR-METERFROMRO sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.