ABAP Select data from SAP table KNBK_SRC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNBK_SRC
*  INTO TABLE @DATA(IT_KNBK_SRC2).
*--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_KNBK_SRC INDEX 1 INTO DATA(WA_KNBK_SRC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNBK_SRC>-MANDT = 1.
<KNBK_SRC>-SOURCE_SYSTEM = 1.
<KNBK_SRC>-SOURCE_ID = 1.
<KNBK_SRC>-BANKS = 1.
<KNBK_SRC>-BANKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNBK_SRC-BANKN, sy-vline,
  WA_KNBK_SRC-BKONT, sy-vline,
  WA_KNBK_SRC-BVTYP, sy-vline,
  WA_KNBK_SRC-XEZER, sy-vline,
  WA_KNBK_SRC-BKREF, sy-vline,
  WA_KNBK_SRC-KOINH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNBK_SRC 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_KNBK_SRC 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_KNBK_SRC INTO WA_KNBK_SRC.


*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_KNBK_SRC_STR, 
MANDT TYPE STRING,
SOURCE_SYSTEM TYPE STRING,
SOURCE_ID TYPE STRING,
BANKS TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
BKONT TYPE STRING,
BVTYP TYPE STRING,
XEZER TYPE STRING,
BKREF TYPE STRING,
KOINH TYPE STRING,
IBAN TYPE STRING,
SOURCE_RECENCY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNBK_SRC_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_KNBK_SRC_STR-MANDT sy-vline 
WA_KNBK_SRC_STR-SOURCE_SYSTEM sy-vline 
WA_KNBK_SRC_STR-SOURCE_ID sy-vline 
WA_KNBK_SRC_STR-BANKS sy-vline 
WA_KNBK_SRC_STR-BANKL sy-vline 
WA_KNBK_SRC_STR-BANKN sy-vline 
WA_KNBK_SRC_STR-BKONT sy-vline 
WA_KNBK_SRC_STR-BVTYP sy-vline 
WA_KNBK_SRC_STR-XEZER sy-vline 
WA_KNBK_SRC_STR-BKREF sy-vline 
WA_KNBK_SRC_STR-KOINH sy-vline 
WA_KNBK_SRC_STR-IBAN sy-vline 
WA_KNBK_SRC_STR-SOURCE_RECENCY sy-vline      INTO ld_text SEPARATED BY SPACE.

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