ABAP Select data from SAP table WVFI_PI_CREATE_DOC_IF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVFI_PI_CREATE_DOC_IF
*  INTO TABLE @DATA(IT_WVFI_PI_CREATE_DOC_IF2).
*--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_WVFI_PI_CREATE_DOC_IF INDEX 1 INTO DATA(WA_WVFI_PI_CREATE_DOC_IF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WVFI_PI_CREATE_DOC_IF>-R_WERKS = 1.
<WVFI_PI_CREATE_DOC_IF>-R_LGORT = 1.
<WVFI_PI_CREATE_DOC_IF>-R_MATKL = 1.
<WVFI_PI_CREATE_DOC_IF>-XONUL = 1.
<WVFI_PI_CREATE_DOC_IF>-XIMAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVFI_PI_CREATE_DOC_IF-GIDAT, sy-vline,
  WA_WVFI_PI_CREATE_DOC_IF-INVNU, sy-vline,
  WA_WVFI_PI_CREATE_DOC_IF-XBLNI, sy-vline,
  WA_WVFI_PI_CREATE_DOC_IF-XBUFI, sy-vline,
  WA_WVFI_PI_CREATE_DOC_IF-SPERR, sy-vline,
  WA_WVFI_PI_CREATE_DOC_IF-MAXPO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVFI_PI_CREATE_DOC_IF 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_WVFI_PI_CREATE_DOC_IF 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_WVFI_PI_CREATE_DOC_IF INTO WA_WVFI_PI_CREATE_DOC_IF.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WVFI_PI_CREATE_DOC_IF_STR, 
R_WERKS TYPE STRING,
R_LGORT TYPE STRING,
R_MATKL TYPE STRING,
XONUL TYPE STRING,
XIMAT TYPE STRING,
GIDAT TYPE STRING,
INVNU TYPE STRING,
XBLNI TYPE STRING,
XBUFI TYPE STRING,
SPERR TYPE STRING,
MAXPO TYPE STRING,
XDELE TYPE STRING,
MIXSAVEG TYPE STRING,
XPROT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVFI_PI_CREATE_DOC_IF_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_WVFI_PI_CREATE_DOC_IF_STR-R_WERKS sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-R_LGORT sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-R_MATKL sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XONUL sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XIMAT sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-GIDAT sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-INVNU sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XBLNI sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XBUFI sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-SPERR sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-MAXPO sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XDELE sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-MIXSAVEG sy-vline 
WA_WVFI_PI_CREATE_DOC_IF_STR-XPROT sy-vline      INTO ld_text SEPARATED BY SPACE.

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