ABAP Select data from SAP table BAPIKNA1_KNVH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BAPIKNA1_KNVH 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 BAPIKNA1_KNVH. 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 BAPIKNA1_KNVH 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_BAPIKNA1_KNVH TYPE STANDARD TABLE OF BAPIKNA1_KNVH,
      WA_BAPIKNA1_KNVH TYPE BAPIKNA1_KNVH,
      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: <BAPIKNA1_KNVH> TYPE BAPIKNA1_KNVH.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BAPIKNA1_KNVH.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BAPIKNA1_KNVH
  INTO TABLE IT_BAPIKNA1_KNVH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPIKNA1_KNVH
*  INTO TABLE @DATA(IT_BAPIKNA1_KNVH2).
*--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_BAPIKNA1_KNVH INDEX 1 INTO DATA(WA_BAPIKNA1_KNVH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BAPIKNA1_KNVH ASSIGNING <BAPIKNA1_KNVH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPIKNA1_KNVH>-CUSTOMER = 1.
<BAPIKNA1_KNVH>-SALES_ORG = 1.
<BAPIKNA1_KNVH>-DISTR_CHAN = 1.
<BAPIKNA1_KNVH>-DIVISION = 1.
<BAPIKNA1_KNVH>-VALID_FROM = 1.

ENDLOOP.

LOOP AT IT_BAPIKNA1_KNVH INTO WA_BAPIKNA1_KNVH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPIKNA1_KNVH-CUSTHITYP, sy-vline,
  WA_BAPIKNA1_KNVH-PARENT_CUSTOMER, sy-vline,
  WA_BAPIKNA1_KNVH-PARENT_SALES_ORG, sy-vline,
  WA_BAPIKNA1_KNVH-PARENT_DISTR_CHAN, sy-vline,
  WA_BAPIKNA1_KNVH-PARENT_DIVISION, sy-vline,
  WA_BAPIKNA1_KNVH-BROTHER_CUSTOMER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPIKNA1_KNVH 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_BAPIKNA1_KNVH 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_BAPIKNA1_KNVH INTO WA_BAPIKNA1_KNVH.


*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 CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPIKNA1_KNVH-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIKNA1_KNVH-CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARENT_CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPIKNA1_KNVH-PARENT_CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIKNA1_KNVH-PARENT_CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BROTHER_CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPIKNA1_KNVH-BROTHER_CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIKNA1_KNVH-BROTHER_CUSTOMER.
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_BAPIKNA1_KNVH_STR, 
CUSTOMER TYPE STRING,
SALES_ORG TYPE STRING,
DISTR_CHAN TYPE STRING,
DIVISION TYPE STRING,
VALID_FROM TYPE STRING,
CUSTHITYP TYPE STRING,
PARENT_CUSTOMER TYPE STRING,
PARENT_SALES_ORG TYPE STRING,
PARENT_DISTR_CHAN TYPE STRING,
PARENT_DIVISION TYPE STRING,
BROTHER_CUSTOMER TYPE STRING,
BROTHER_SALES_ORG TYPE STRING,
BROTHER_DISTR_CHAN TYPE STRING,
BROTHER_DIVISION TYPE STRING,
NODE_LEVEL TYPE STRING,
VALID_TO TYPE STRING,
ROUTINE TYPE STRING,
REBATE_REL TYPE STRING,
PRIC_REL TYPE STRING,
ASSIGN_HI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPIKNA1_KNVH_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_BAPIKNA1_KNVH_STR-CUSTOMER sy-vline 
WA_BAPIKNA1_KNVH_STR-SALES_ORG sy-vline 
WA_BAPIKNA1_KNVH_STR-DISTR_CHAN sy-vline 
WA_BAPIKNA1_KNVH_STR-DIVISION sy-vline 
WA_BAPIKNA1_KNVH_STR-VALID_FROM sy-vline 
WA_BAPIKNA1_KNVH_STR-CUSTHITYP sy-vline 
WA_BAPIKNA1_KNVH_STR-PARENT_CUSTOMER sy-vline 
WA_BAPIKNA1_KNVH_STR-PARENT_SALES_ORG sy-vline 
WA_BAPIKNA1_KNVH_STR-PARENT_DISTR_CHAN sy-vline 
WA_BAPIKNA1_KNVH_STR-PARENT_DIVISION sy-vline 
WA_BAPIKNA1_KNVH_STR-BROTHER_CUSTOMER sy-vline 
WA_BAPIKNA1_KNVH_STR-BROTHER_SALES_ORG sy-vline 
WA_BAPIKNA1_KNVH_STR-BROTHER_DISTR_CHAN sy-vline 
WA_BAPIKNA1_KNVH_STR-BROTHER_DIVISION sy-vline 
WA_BAPIKNA1_KNVH_STR-NODE_LEVEL sy-vline 
WA_BAPIKNA1_KNVH_STR-VALID_TO sy-vline 
WA_BAPIKNA1_KNVH_STR-ROUTINE sy-vline 
WA_BAPIKNA1_KNVH_STR-REBATE_REL sy-vline 
WA_BAPIKNA1_KNVH_STR-PRIC_REL sy-vline 
WA_BAPIKNA1_KNVH_STR-ASSIGN_HI sy-vline      INTO ld_text SEPARATED BY SPACE.

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