ABAP Select data from SAP table VAKEVBNR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VAKEVBNR
*  INTO TABLE @DATA(IT_VAKEVBNR2).
*--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_VAKEVBNR INDEX 1 INTO DATA(WA_VAKEVBNR2).


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

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

ENDLOOP.

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

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


*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_VAKEVBNR-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKEVBNR-KOTABNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNUMA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKEVBNR-KNUMA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKEVBNR-KNUMA.
WRITE:/ 'New Value:', ld_input.

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

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