ABAP Select data from SAP table BKNEX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BKNEX
*  INTO TABLE @DATA(IT_BKNEX2).
*--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_BKNEX INDEX 1 INTO DATA(WA_BKNEX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BKNEX>-STYPE = 1.
<BKNEX>-TBNAM = 1.
<BKNEX>-XDELE = 1.
<BKNEX>-LNDEX = 1.
<BKNEX>-TDOCO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BKNEX-TDODA, sy-vline,
  WA_BKNEX-SDNCO, sy-vline,
  WA_BKNEX-SDNDA, sy-vline,
  WA_BKNEX-DHRCO, sy-vline,
  WA_BKNEX-DHRDA, sy-vline,
  WA_BKNEX-SENDE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BKNEX 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_BKNEX 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_BKNEX INTO WA_BKNEX.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_BKNEX_STR, 
STYPE TYPE STRING,
TBNAM TYPE STRING,
XDELE TYPE STRING,
LNDEX TYPE STRING,
TDOCO TYPE STRING,
TDODA TYPE STRING,
SDNCO TYPE STRING,
SDNDA TYPE STRING,
DHRCO TYPE STRING,
DHRDA TYPE STRING,
SENDE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BKNEX_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_BKNEX_STR-STYPE sy-vline 
WA_BKNEX_STR-TBNAM sy-vline 
WA_BKNEX_STR-XDELE sy-vline 
WA_BKNEX_STR-LNDEX sy-vline 
WA_BKNEX_STR-TDOCO sy-vline 
WA_BKNEX_STR-TDODA sy-vline 
WA_BKNEX_STR-SDNCO sy-vline 
WA_BKNEX_STR-SDNDA sy-vline 
WA_BKNEX_STR-DHRCO sy-vline 
WA_BKNEX_STR-DHRDA sy-vline 
WA_BKNEX_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.