ABAP Select data from SAP table BKNB1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BKNB1 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 BKNB1. 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 BKNB1 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_BKNB1 TYPE STANDARD TABLE OF BKNB1,
      WA_BKNB1 TYPE BKNB1,
      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: <BKNB1> TYPE BKNB1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BKNB1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BKNB1
  INTO TABLE IT_BKNB1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BKNB1
*  INTO TABLE @DATA(IT_BKNB12).
*--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_BKNB1 INDEX 1 INTO DATA(WA_BKNB12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BKNB1 ASSIGNING <BKNB1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BKNB1>-STYPE = 1.
<BKNB1>-TBNAM = 1.
<BKNB1>-AKONT = 1.
<BKNB1>-ZUAWA = 1.
<BKNB1>-KNRZE = 1.

ENDLOOP.

LOOP AT IT_BKNB1 INTO WA_BKNB1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BKNB1-BLNKZ, sy-vline,
  WA_BKNB1-XDEZV, sy-vline,
  WA_BKNB1-FDGRV, sy-vline,
  WA_BKNB1-BEGRU, sy-vline,
  WA_BKNB1-VZSKZ, sy-vline,
  WA_BKNB1-ZINDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BKNB1 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_BKNB1 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_BKNB1 INTO WA_BKNB1.


*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 AKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-AKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-AKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-KNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-KNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-KNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-KNRZB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REMIT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-REMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-REMIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EKVBD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-EKVBD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-EKVBD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SXIDN, internal->external for field SMTP_ADDR
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_BKNB1-SMTP_ADDR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BKNB1-SMTP_ADDR.
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_BKNB1_STR, 
STYPE TYPE STRING,
TBNAM TYPE STRING,
AKONT TYPE STRING,
ZUAWA TYPE STRING,
KNRZE TYPE STRING,
BLNKZ TYPE STRING,
XDEZV TYPE STRING,
FDGRV TYPE STRING,
BEGRU TYPE STRING,
VZSKZ TYPE STRING,
ZINDT TYPE STRING,
ZINRT TYPE STRING,
DATLZ TYPE STRING,
ZTERM TYPE STRING,
TOGRU TYPE STRING,
WAKON TYPE STRING,
XZVER TYPE STRING,
KULTG TYPE STRING,
ZWELS TYPE STRING,
ZAHLS TYPE STRING,
KNRZB TYPE STRING,
HBKID TYPE STRING,
XPORE TYPE STRING,
WEBTR TYPE STRING,
XVERR TYPE STRING,
REMIT TYPE STRING,
BUSAB TYPE STRING,
XAUSZ TYPE STRING,
EIKTO TYPE STRING,
PERKZ TYPE STRING,
ZSABE TYPE STRING,
KVERM TYPE STRING,
ZAMIM TYPE STRING,
ZAMIV TYPE STRING,
ZAMIO TYPE STRING,
ZAMIB TYPE STRING,
ZAMIR TYPE STRING,
VRSNR TYPE STRING,
VRBKZ TYPE STRING,
VLIBB TYPE STRING,
VERDT TYPE STRING,
VRSZL TYPE STRING,
VRSPR TYPE STRING,
LOEVM TYPE STRING,
SPERR TYPE STRING,
ALTKN TYPE STRING,
ZGRUP TYPE STRING,
URLID TYPE STRING,
MGRUP TYPE STRING,
LOCKB TYPE STRING,
UZAWE TYPE STRING,
EKVBD TYPE STRING,
SREGL TYPE STRING,
XEDIP TYPE STRING,
FRGRP TYPE STRING,
VRSDG TYPE STRING,
PERNR TYPE STRING,
TLFXS TYPE STRING,
INTAD TYPE STRING,
GUZTE TYPE STRING,
GRICD TYPE STRING,
GRIDT TYPE STRING,
WBRSL TYPE STRING,
NODEL TYPE STRING,
TLFNS TYPE STRING,
CESSION_KZ TYPE STRING,
GMVKZD TYPE STRING,
QLAND TYPE STRING,
AVSND TYPE STRING,
SMTP_ADDR TYPE STRING,
CIIUCODE TYPE STRING,
SENDE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BKNB1_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_BKNB1_STR-STYPE sy-vline 
WA_BKNB1_STR-TBNAM sy-vline 
WA_BKNB1_STR-AKONT sy-vline 
WA_BKNB1_STR-ZUAWA sy-vline 
WA_BKNB1_STR-KNRZE sy-vline 
WA_BKNB1_STR-BLNKZ sy-vline 
WA_BKNB1_STR-XDEZV sy-vline 
WA_BKNB1_STR-FDGRV sy-vline 
WA_BKNB1_STR-BEGRU sy-vline 
WA_BKNB1_STR-VZSKZ sy-vline 
WA_BKNB1_STR-ZINDT sy-vline 
WA_BKNB1_STR-ZINRT sy-vline 
WA_BKNB1_STR-DATLZ sy-vline 
WA_BKNB1_STR-ZTERM sy-vline 
WA_BKNB1_STR-TOGRU sy-vline 
WA_BKNB1_STR-WAKON sy-vline 
WA_BKNB1_STR-XZVER sy-vline 
WA_BKNB1_STR-KULTG sy-vline 
WA_BKNB1_STR-ZWELS sy-vline 
WA_BKNB1_STR-ZAHLS sy-vline 
WA_BKNB1_STR-KNRZB sy-vline 
WA_BKNB1_STR-HBKID sy-vline 
WA_BKNB1_STR-XPORE sy-vline 
WA_BKNB1_STR-WEBTR sy-vline 
WA_BKNB1_STR-XVERR sy-vline 
WA_BKNB1_STR-REMIT sy-vline 
WA_BKNB1_STR-BUSAB sy-vline 
WA_BKNB1_STR-XAUSZ sy-vline 
WA_BKNB1_STR-EIKTO sy-vline 
WA_BKNB1_STR-PERKZ sy-vline 
WA_BKNB1_STR-ZSABE sy-vline 
WA_BKNB1_STR-KVERM sy-vline 
WA_BKNB1_STR-ZAMIM sy-vline 
WA_BKNB1_STR-ZAMIV sy-vline 
WA_BKNB1_STR-ZAMIO sy-vline 
WA_BKNB1_STR-ZAMIB sy-vline 
WA_BKNB1_STR-ZAMIR sy-vline 
WA_BKNB1_STR-VRSNR sy-vline 
WA_BKNB1_STR-VRBKZ sy-vline 
WA_BKNB1_STR-VLIBB sy-vline 
WA_BKNB1_STR-VERDT sy-vline 
WA_BKNB1_STR-VRSZL sy-vline 
WA_BKNB1_STR-VRSPR sy-vline 
WA_BKNB1_STR-LOEVM sy-vline 
WA_BKNB1_STR-SPERR sy-vline 
WA_BKNB1_STR-ALTKN sy-vline 
WA_BKNB1_STR-ZGRUP sy-vline 
WA_BKNB1_STR-URLID sy-vline 
WA_BKNB1_STR-MGRUP sy-vline 
WA_BKNB1_STR-LOCKB sy-vline 
WA_BKNB1_STR-UZAWE sy-vline 
WA_BKNB1_STR-EKVBD sy-vline 
WA_BKNB1_STR-SREGL sy-vline 
WA_BKNB1_STR-XEDIP sy-vline 
WA_BKNB1_STR-FRGRP sy-vline 
WA_BKNB1_STR-VRSDG sy-vline 
WA_BKNB1_STR-PERNR sy-vline 
WA_BKNB1_STR-TLFXS sy-vline 
WA_BKNB1_STR-INTAD sy-vline 
WA_BKNB1_STR-GUZTE sy-vline 
WA_BKNB1_STR-GRICD sy-vline 
WA_BKNB1_STR-GRIDT sy-vline 
WA_BKNB1_STR-WBRSL sy-vline 
WA_BKNB1_STR-NODEL sy-vline 
WA_BKNB1_STR-TLFNS sy-vline 
WA_BKNB1_STR-CESSION_KZ sy-vline 
WA_BKNB1_STR-GMVKZD sy-vline 
WA_BKNB1_STR-QLAND sy-vline 
WA_BKNB1_STR-AVSND sy-vline 
WA_BKNB1_STR-SMTP_ADDR sy-vline 
WA_BKNB1_STR-CIIUCODE sy-vline 
WA_BKNB1_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.