ABAP Select data from SAP table WVFB_KOND_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVFB_KOND_HEAD
*  INTO TABLE @DATA(IT_WVFB_KOND_HEAD2).
*--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_WVFB_KOND_HEAD INDEX 1 INTO DATA(WA_WVFB_KOND_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WVFB_KOND_HEAD>-WGSREQN = 1.
<WVFB_KOND_HEAD>-WGSREQP = 1.
<WVFB_KOND_HEAD>-I_BELNR = 1.
<WVFB_KOND_HEAD>-I_POSNR = 1.
<WVFB_KOND_HEAD>-NR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVFB_KOND_HEAD-STATUS, sy-vline,
  WA_WVFB_KOND_HEAD-ALCKZ, sy-vline,
  WA_WVFB_KOND_HEAD-KSCHL, sy-vline,
  WA_WVFB_KOND_HEAD-KOTXT, sy-vline,
  WA_WVFB_KOND_HEAD-BETRG, sy-vline,
  WA_WVFB_KOND_HEAD-KPERC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVFB_KOND_HEAD 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_WVFB_KOND_HEAD 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_WVFB_KOND_HEAD INTO WA_WVFB_KOND_HEAD.


*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 WGSREQN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFB_KOND_HEAD-WGSREQN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFB_KOND_HEAD-WGSREQN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field I_BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVFB_KOND_HEAD-I_BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVFB_KOND_HEAD-I_BELNR.
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_WVFB_KOND_HEAD_STR, 
WGSREQN TYPE STRING,
WGSREQP TYPE STRING,
I_BELNR TYPE STRING,
I_POSNR TYPE STRING,
NR TYPE STRING,
STATUS TYPE STRING,
ALCKZ TYPE STRING,
KSCHL TYPE STRING,
KOTXT TYPE STRING,
BETRG TYPE STRING,
KPERC TYPE STRING,
KRATE TYPE STRING,
UPRBS TYPE STRING,
MEAUN TYPE STRING,
KOBTR TYPE STRING,
MENGE TYPE STRING,
PREIS TYPE STRING,
MWSKZ TYPE STRING,
MSATZ TYPE STRING,
KOEIN TYPE STRING,
CURTP TYPE STRING,
KOBAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVFB_KOND_HEAD_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_WVFB_KOND_HEAD_STR-WGSREQN sy-vline 
WA_WVFB_KOND_HEAD_STR-WGSREQP sy-vline 
WA_WVFB_KOND_HEAD_STR-I_BELNR sy-vline 
WA_WVFB_KOND_HEAD_STR-I_POSNR sy-vline 
WA_WVFB_KOND_HEAD_STR-NR sy-vline 
WA_WVFB_KOND_HEAD_STR-STATUS sy-vline 
WA_WVFB_KOND_HEAD_STR-ALCKZ sy-vline 
WA_WVFB_KOND_HEAD_STR-KSCHL sy-vline 
WA_WVFB_KOND_HEAD_STR-KOTXT sy-vline 
WA_WVFB_KOND_HEAD_STR-BETRG sy-vline 
WA_WVFB_KOND_HEAD_STR-KPERC sy-vline 
WA_WVFB_KOND_HEAD_STR-KRATE sy-vline 
WA_WVFB_KOND_HEAD_STR-UPRBS sy-vline 
WA_WVFB_KOND_HEAD_STR-MEAUN sy-vline 
WA_WVFB_KOND_HEAD_STR-KOBTR sy-vline 
WA_WVFB_KOND_HEAD_STR-MENGE sy-vline 
WA_WVFB_KOND_HEAD_STR-PREIS sy-vline 
WA_WVFB_KOND_HEAD_STR-MWSKZ sy-vline 
WA_WVFB_KOND_HEAD_STR-MSATZ sy-vline 
WA_WVFB_KOND_HEAD_STR-KOEIN sy-vline 
WA_WVFB_KOND_HEAD_STR-CURTP sy-vline 
WA_WVFB_KOND_HEAD_STR-KOBAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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