ABAP Select data from SAP table BKK621 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BKK621 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 BKK621. 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 BKK621 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_BKK621 TYPE STANDARD TABLE OF BKK621,
      WA_BKK621 TYPE BKK621,
      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: <BKK621> TYPE BKK621.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BKK621.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BKK621
  INTO TABLE IT_BKK621.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BKK621
*  INTO TABLE @DATA(IT_BKK6212).
*--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_BKK621 INDEX 1 INTO DATA(WA_BKK6212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BKK621 ASSIGNING <BKK621>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BKK621>-CLIENT = 1.
<BKK621>-DATE_CR = 1.
<BKK621>-BKKRS = 1.
<BKK621>-ACCOUNT = 1.
<BKK621>-CURRENCY = 1.

ENDLOOP.

LOOP AT IT_BKK621 INTO WA_BKK621.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BKK621-CLMINBLNCE, sy-vline,
  WA_BKK621-CLMAXBLNCE, sy-vline,
  WA_BKK621-CLMINTRANS, sy-vline,
  WA_BKK621-CLPAYNOTE, sy-vline,
  WA_BKK621-CLPAYNOTE1, sy-vline,
  WA_BKK621-CURR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BKK621 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_BKK621 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_BKK621 INTO WA_BKK621.


*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 ACCOUNT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKK621-ACCOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKK621-ACCOUNT.
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_BKK621_STR, 
CLIENT TYPE STRING,
DATE_CR TYPE STRING,
BKKRS TYPE STRING,
ACCOUNT TYPE STRING,
CURRENCY TYPE STRING,
CLMINBLNCE TYPE STRING,
CLMAXBLNCE TYPE STRING,
CLMINTRANS TYPE STRING,
CLPAYNOTE TYPE STRING,
CLPAYNOTE1 TYPE STRING,
CURR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BKK621_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_BKK621_STR-CLIENT sy-vline 
WA_BKK621_STR-DATE_CR sy-vline 
WA_BKK621_STR-BKKRS sy-vline 
WA_BKK621_STR-ACCOUNT sy-vline 
WA_BKK621_STR-CURRENCY sy-vline 
WA_BKK621_STR-CLMINBLNCE sy-vline 
WA_BKK621_STR-CLMAXBLNCE sy-vline 
WA_BKK621_STR-CLMINTRANS sy-vline 
WA_BKK621_STR-CLPAYNOTE sy-vline 
WA_BKK621_STR-CLPAYNOTE1 sy-vline 
WA_BKK621_STR-CURR sy-vline      INTO ld_text SEPARATED BY SPACE.

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