ABAP Select data from SAP table KNA1_BF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNA1_BF 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 KNA1_BF. 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 KNA1_BF 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_KNA1_BF TYPE STANDARD TABLE OF KNA1_BF,
      WA_KNA1_BF TYPE KNA1_BF,
      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: <KNA1_BF> TYPE KNA1_BF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KNA1_BF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KNA1_BF
  INTO TABLE IT_KNA1_BF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNA1_BF
*  INTO TABLE @DATA(IT_KNA1_BF2).
*--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_KNA1_BF INDEX 1 INTO DATA(WA_KNA1_BF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KNA1_BF ASSIGNING <KNA1_BF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNA1_BF>-BBBNR = 1.
<KNA1_BF>-BBSNR = 1.
<KNA1_BF>-BUBKZ = 1.
<KNA1_BF>-LAND1 = 1.
<KNA1_BF>-PFACH = 1.

ENDLOOP.

LOOP AT IT_KNA1_BF INTO WA_KNA1_BF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNA1_BF-PSTLZ, sy-vline,
  WA_KNA1_BF-PSTL2, sy-vline,
  WA_KNA1_BF-REGIO, sy-vline,
  WA_KNA1_BF-STKZN, sy-vline,
  WA_KNA1_BF-STKZU, sy-vline,
  WA_KNA1_BF-STCD1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNA1_BF 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_KNA1_BF 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_KNA1_BF INTO WA_KNA1_BF.


*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_KNA1_BF_STR, 
BBBNR TYPE STRING,
BBSNR TYPE STRING,
BUBKZ TYPE STRING,
LAND1 TYPE STRING,
PFACH TYPE STRING,
PSTLZ TYPE STRING,
PSTL2 TYPE STRING,
REGIO TYPE STRING,
STKZN TYPE STRING,
STKZU TYPE STRING,
STCD1 TYPE STRING,
STCD2 TYPE STRING,
STCEG TYPE STRING,
STCD_TYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNA1_BF_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_KNA1_BF_STR-BBBNR sy-vline 
WA_KNA1_BF_STR-BBSNR sy-vline 
WA_KNA1_BF_STR-BUBKZ sy-vline 
WA_KNA1_BF_STR-LAND1 sy-vline 
WA_KNA1_BF_STR-PFACH sy-vline 
WA_KNA1_BF_STR-PSTLZ sy-vline 
WA_KNA1_BF_STR-PSTL2 sy-vline 
WA_KNA1_BF_STR-REGIO sy-vline 
WA_KNA1_BF_STR-STKZN sy-vline 
WA_KNA1_BF_STR-STKZU sy-vline 
WA_KNA1_BF_STR-STCD1 sy-vline 
WA_KNA1_BF_STR-STCD2 sy-vline 
WA_KNA1_BF_STR-STCEG sy-vline 
WA_KNA1_BF_STR-STCD_TYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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