ABAP Select data from SAP table VAKEVB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VAKEVB
*  INTO TABLE @DATA(IT_VAKEVB2).
*--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_VAKEVB INDEX 1 INTO DATA(WA_VAKEVB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VAKEVB>-KVEWE = 1.
<VAKEVB>-KOTABNR = 1.
<VAKEVB>-KAPPL = 1.
<VAKEVB>-KSCHL = 1.
<VAKEVB>-VAKEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VAKEVB-DATBI, sy-vline,
  WA_VAKEVB-DATAB, sy-vline,
  WA_VAKEVB-KNUMH, sy-vline,
  WA_VAKEVB-KNUMA, sy-vline,
  WA_VAKEVB-VADAT, sy-vline,
  WA_VAKEVB-TABIX1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VAKEVB 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_VAKEVB 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_VAKEVB INTO WA_VAKEVB.


*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 KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_VAKEVB-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKEVB-KOTABNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNUMA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKEVB-KNUMA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKEVB-KNUMA.
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_VAKEVB_STR, 
KVEWE TYPE STRING,
KOTABNR TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
VAKEY TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KNUMH TYPE STRING,
KNUMA TYPE STRING,
VADAT TYPE STRING,
TABIX1 TYPE STRING,
TABIX2 TYPE STRING,
TABIX3 TYPE STRING,
NUMBER TYPE STRING,
PERKON TYPE STRING,
UPDKZ TYPE STRING,
NOUPD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VAKEVB_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_VAKEVB_STR-KVEWE sy-vline 
WA_VAKEVB_STR-KOTABNR sy-vline 
WA_VAKEVB_STR-KAPPL sy-vline 
WA_VAKEVB_STR-KSCHL sy-vline 
WA_VAKEVB_STR-VAKEY sy-vline 
WA_VAKEVB_STR-DATBI sy-vline 
WA_VAKEVB_STR-DATAB sy-vline 
WA_VAKEVB_STR-KNUMH sy-vline 
WA_VAKEVB_STR-KNUMA sy-vline 
WA_VAKEVB_STR-VADAT sy-vline 
WA_VAKEVB_STR-TABIX1 sy-vline 
WA_VAKEVB_STR-TABIX2 sy-vline 
WA_VAKEVB_STR-TABIX3 sy-vline 
WA_VAKEVB_STR-NUMBER sy-vline 
WA_VAKEVB_STR-PERKON sy-vline 
WA_VAKEVB_STR-UPDKZ sy-vline 
WA_VAKEVB_STR-NOUPD sy-vline      INTO ld_text SEPARATED BY SPACE.

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