ABAP Select data from SAP table BKNVK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BKNVK
*  INTO TABLE @DATA(IT_BKNVK2).
*--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_BKNVK INDEX 1 INTO DATA(WA_BKNVK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BKNVK>-STYPE = 1.
<BKNVK>-TBNAM = 1.
<BKNVK>-XDELE = 1.
<BKNVK>-PARNR = 1.
<BKNVK>-NAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BKNVK-TELF1, sy-vline,
  WA_BKNVK-ABTNR, sy-vline,
  WA_BKNVK-NAMEV, sy-vline,
  WA_BKNVK-ANRED, sy-vline,
  WA_BKNVK-PAFKT, sy-vline,
  WA_BKNVK-SORTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BKNVK 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_BKNVK 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_BKNVK INTO WA_BKNVK.


*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 ISOLA, internal->external for field PARLA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_BKNVK-PARLA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNVK-PARLA.
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_BKNVK_STR, 
STYPE TYPE STRING,
TBNAM TYPE STRING,
XDELE TYPE STRING,
PARNR TYPE STRING,
NAME1 TYPE STRING,
TELF1 TYPE STRING,
ABTNR TYPE STRING,
NAMEV TYPE STRING,
ANRED TYPE STRING,
PAFKT TYPE STRING,
SORTL TYPE STRING,
PARLA TYPE STRING,
PARGE TYPE STRING,
FAMST TYPE STRING,
GBDAT TYPE STRING,
ABTPA TYPE STRING,
PAVIP TYPE STRING,
PARVO TYPE STRING,
NMAIL TYPE STRING,
UEPAR TYPE STRING,
VRTNR TYPE STRING,
BRYTH TYPE STRING,
AKVER TYPE STRING,
PARAU TYPE STRING,
PARH1 TYPE STRING,
PARH2 TYPE STRING,
PARH3 TYPE STRING,
PARH4 TYPE STRING,
PARH5 TYPE STRING,
PAKN1 TYPE STRING,
PAKN2 TYPE STRING,
PAKN3 TYPE STRING,
PAKN4 TYPE STRING,
PAKN5 TYPE STRING,
MOAB1 TYPE STRING,
MOBI1 TYPE STRING,
MOAB2 TYPE STRING,
MOBI2 TYPE STRING,
DIAB1 TYPE STRING,
DIBI1 TYPE STRING,
DIAB2 TYPE STRING,
DIBI2 TYPE STRING,
MIAB1 TYPE STRING,
MIBI1 TYPE STRING,
MIAB2 TYPE STRING,
MIBI2 TYPE STRING,
DOAB1 TYPE STRING,
DOBI1 TYPE STRING,
DOAB2 TYPE STRING,
DOBI2 TYPE STRING,
FRAB1 TYPE STRING,
FRBI1 TYPE STRING,
FRAB2 TYPE STRING,
FRBI2 TYPE STRING,
SAAB1 TYPE STRING,
SABI1 TYPE STRING,
SAAB2 TYPE STRING,
SABI2 TYPE STRING,
SOAB1 TYPE STRING,
SOBI1 TYPE STRING,
SOAB2 TYPE STRING,
SOBI2 TYPE STRING,
SPNAM TYPE STRING,
TITEL_AP TYPE STRING,
SENDE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BKNVK_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_BKNVK_STR-STYPE sy-vline 
WA_BKNVK_STR-TBNAM sy-vline 
WA_BKNVK_STR-XDELE sy-vline 
WA_BKNVK_STR-PARNR sy-vline 
WA_BKNVK_STR-NAME1 sy-vline 
WA_BKNVK_STR-TELF1 sy-vline 
WA_BKNVK_STR-ABTNR sy-vline 
WA_BKNVK_STR-NAMEV sy-vline 
WA_BKNVK_STR-ANRED sy-vline 
WA_BKNVK_STR-PAFKT sy-vline 
WA_BKNVK_STR-SORTL sy-vline 
WA_BKNVK_STR-PARLA sy-vline 
WA_BKNVK_STR-PARGE sy-vline 
WA_BKNVK_STR-FAMST sy-vline 
WA_BKNVK_STR-GBDAT sy-vline 
WA_BKNVK_STR-ABTPA sy-vline 
WA_BKNVK_STR-PAVIP sy-vline 
WA_BKNVK_STR-PARVO sy-vline 
WA_BKNVK_STR-NMAIL sy-vline 
WA_BKNVK_STR-UEPAR sy-vline 
WA_BKNVK_STR-VRTNR sy-vline 
WA_BKNVK_STR-BRYTH sy-vline 
WA_BKNVK_STR-AKVER sy-vline 
WA_BKNVK_STR-PARAU sy-vline 
WA_BKNVK_STR-PARH1 sy-vline 
WA_BKNVK_STR-PARH2 sy-vline 
WA_BKNVK_STR-PARH3 sy-vline 
WA_BKNVK_STR-PARH4 sy-vline 
WA_BKNVK_STR-PARH5 sy-vline 
WA_BKNVK_STR-PAKN1 sy-vline 
WA_BKNVK_STR-PAKN2 sy-vline 
WA_BKNVK_STR-PAKN3 sy-vline 
WA_BKNVK_STR-PAKN4 sy-vline 
WA_BKNVK_STR-PAKN5 sy-vline 
WA_BKNVK_STR-MOAB1 sy-vline 
WA_BKNVK_STR-MOBI1 sy-vline 
WA_BKNVK_STR-MOAB2 sy-vline 
WA_BKNVK_STR-MOBI2 sy-vline 
WA_BKNVK_STR-DIAB1 sy-vline 
WA_BKNVK_STR-DIBI1 sy-vline 
WA_BKNVK_STR-DIAB2 sy-vline 
WA_BKNVK_STR-DIBI2 sy-vline 
WA_BKNVK_STR-MIAB1 sy-vline 
WA_BKNVK_STR-MIBI1 sy-vline 
WA_BKNVK_STR-MIAB2 sy-vline 
WA_BKNVK_STR-MIBI2 sy-vline 
WA_BKNVK_STR-DOAB1 sy-vline 
WA_BKNVK_STR-DOBI1 sy-vline 
WA_BKNVK_STR-DOAB2 sy-vline 
WA_BKNVK_STR-DOBI2 sy-vline 
WA_BKNVK_STR-FRAB1 sy-vline 
WA_BKNVK_STR-FRBI1 sy-vline 
WA_BKNVK_STR-FRAB2 sy-vline 
WA_BKNVK_STR-FRBI2 sy-vline 
WA_BKNVK_STR-SAAB1 sy-vline 
WA_BKNVK_STR-SABI1 sy-vline 
WA_BKNVK_STR-SAAB2 sy-vline 
WA_BKNVK_STR-SABI2 sy-vline 
WA_BKNVK_STR-SOAB1 sy-vline 
WA_BKNVK_STR-SOBI1 sy-vline 
WA_BKNVK_STR-SOAB2 sy-vline 
WA_BKNVK_STR-SOBI2 sy-vline 
WA_BKNVK_STR-SPNAM sy-vline 
WA_BKNVK_STR-TITEL_AP sy-vline 
WA_BKNVK_STR-SENDE sy-vline      INTO ld_text SEPARATED BY SPACE.

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