ABAP Select data from SAP table BKNBK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BKNBK
*  INTO TABLE @DATA(IT_BKNBK2).
*--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_BKNBK INDEX 1 INTO DATA(WA_BKNBK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BKNBK>-STYPE = 1.
<BKNBK>-TBNAM = 1.
<BKNBK>-XDELE = 1.
<BKNBK>-BANKS = 1.
<BKNBK>-BANKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BKNBK-BANKN, sy-vline,
  WA_BKNBK-BKONT, sy-vline,
  WA_BKNBK-BVTYP, sy-vline,
  WA_BKNBK-XEZER, sy-vline,
  WA_BKNBK-BANKA, sy-vline,
  WA_BKNBK-DUMMY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BKNBK 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_BKNBK 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_BKNBK INTO WA_BKNBK.


*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_BKNBK_STR, 
STYPE TYPE STRING,
TBNAM TYPE STRING,
XDELE TYPE STRING,
BANKS TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
BKONT TYPE STRING,
BVTYP TYPE STRING,
XEZER TYPE STRING,
BANKA TYPE STRING,
DUMMY TYPE STRING,
STRAS TYPE STRING,
ORT01 TYPE STRING,
SWIFT TYPE STRING,
BGRUP TYPE STRING,
XPGRO TYPE STRING,
BNKLZ TYPE STRING,
PSKTO TYPE STRING,
BKREF TYPE STRING,
BRNCH TYPE STRING,
PROVZ TYPE STRING,
KOINH TYPE STRING,
KOVON TYPE STRING,
KOBIS TYPE STRING,
IBAN TYPE STRING,
VALID_FROM TYPE STRING,
SENDE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BKNBK_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_BKNBK_STR-STYPE sy-vline 
WA_BKNBK_STR-TBNAM sy-vline 
WA_BKNBK_STR-XDELE sy-vline 
WA_BKNBK_STR-BANKS sy-vline 
WA_BKNBK_STR-BANKL sy-vline 
WA_BKNBK_STR-BANKN sy-vline 
WA_BKNBK_STR-BKONT sy-vline 
WA_BKNBK_STR-BVTYP sy-vline 
WA_BKNBK_STR-XEZER sy-vline 
WA_BKNBK_STR-BANKA sy-vline 
WA_BKNBK_STR-DUMMY sy-vline 
WA_BKNBK_STR-STRAS sy-vline 
WA_BKNBK_STR-ORT01 sy-vline 
WA_BKNBK_STR-SWIFT sy-vline 
WA_BKNBK_STR-BGRUP sy-vline 
WA_BKNBK_STR-XPGRO sy-vline 
WA_BKNBK_STR-BNKLZ sy-vline 
WA_BKNBK_STR-PSKTO sy-vline 
WA_BKNBK_STR-BKREF sy-vline 
WA_BKNBK_STR-BRNCH sy-vline 
WA_BKNBK_STR-PROVZ sy-vline 
WA_BKNBK_STR-KOINH sy-vline 
WA_BKNBK_STR-KOVON sy-vline 
WA_BKNBK_STR-KOBIS sy-vline 
WA_BKNBK_STR-IBAN sy-vline 
WA_BKNBK_STR-VALID_FROM sy-vline 
WA_BKNBK_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.