ABAP Select data from SAP table BIW_KNB1_S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BIW_KNB1_S 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 BIW_KNB1_S. 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 BIW_KNB1_S 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_BIW_KNB1_S TYPE STANDARD TABLE OF BIW_KNB1_S,
      WA_BIW_KNB1_S TYPE BIW_KNB1_S,
      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: <BIW_KNB1_S> TYPE BIW_KNB1_S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BIW_KNB1_S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BIW_KNB1_S
  INTO TABLE IT_BIW_KNB1_S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_KNB1_S
*  INTO TABLE @DATA(IT_BIW_KNB1_S2).
*--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_BIW_KNB1_S INDEX 1 INTO DATA(WA_BIW_KNB1_S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BIW_KNB1_S ASSIGNING <BIW_KNB1_S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_KNB1_S>-MANDT = 1.
<BIW_KNB1_S>-KUNNR = 1.
<BIW_KNB1_S>-BUKRS = 1.
<BIW_KNB1_S>-PERNR = 1.
<BIW_KNB1_S>-ERDAT = 1.

ENDLOOP.

LOOP AT IT_BIW_KNB1_S INTO WA_BIW_KNB1_S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_KNB1_S-ERNAM, sy-vline,
  WA_BIW_KNB1_S-SPERR, sy-vline,
  WA_BIW_KNB1_S-LOEVM, sy-vline,
  WA_BIW_KNB1_S-ZUAWA, sy-vline,
  WA_BIW_KNB1_S-BUSAB, sy-vline,
  WA_BIW_KNB1_S-AKONT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_KNB1_S 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_BIW_KNB1_S 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_BIW_KNB1_S INTO WA_BIW_KNB1_S.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-AKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-AKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-KNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-KNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-KNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-KNRZB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REMIT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-REMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-REMIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EKVBD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_KNB1_S-EKVBD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_KNB1_S-EKVBD.
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_BIW_KNB1_S_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
BUKRS TYPE STRING,
PERNR TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
SPERR TYPE STRING,
LOEVM TYPE STRING,
ZUAWA TYPE STRING,
BUSAB TYPE STRING,
AKONT TYPE STRING,
BEGRU TYPE STRING,
KNRZE TYPE STRING,
KNRZB TYPE STRING,
ZAMIM TYPE STRING,
ZAMIV TYPE STRING,
ZAMIR TYPE STRING,
ZAMIB TYPE STRING,
ZAMIO TYPE STRING,
ZWELS TYPE STRING,
XVERR TYPE STRING,
ZAHLS TYPE STRING,
ZTERM TYPE STRING,
WAKON TYPE STRING,
VZSKZ TYPE STRING,
EIKTO TYPE STRING,
ZSABE TYPE STRING,
KVERM TYPE STRING,
FDGRV TYPE STRING,
VRBKZ TYPE STRING,
VRSZL TYPE STRING,
VRSPR TYPE STRING,
VRSNR TYPE STRING,
VERDT TYPE STRING,
PERKZ TYPE STRING,
XDEZV TYPE STRING,
XAUSZ TYPE STRING,
REMIT TYPE STRING,
DATLZ TYPE STRING,
XZVER TYPE STRING,
TOGRU TYPE STRING,
KULTG TYPE STRING,
HBKID TYPE STRING,
XPORE TYPE STRING,
BLNKZ 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,
TLFXS TYPE STRING,
INTAD TYPE STRING,
XKNZB TYPE STRING,
GUZTE TYPE STRING,
GRICD TYPE STRING,
GRIDT TYPE STRING,
WBRSL TYPE STRING,
CONFS TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
NODEL TYPE STRING,
TLFNS TYPE STRING,
CESSION_KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BIW_KNB1_S_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_BIW_KNB1_S_STR-MANDT sy-vline 
WA_BIW_KNB1_S_STR-KUNNR sy-vline 
WA_BIW_KNB1_S_STR-BUKRS sy-vline 
WA_BIW_KNB1_S_STR-PERNR sy-vline 
WA_BIW_KNB1_S_STR-ERDAT sy-vline 
WA_BIW_KNB1_S_STR-ERNAM sy-vline 
WA_BIW_KNB1_S_STR-SPERR sy-vline 
WA_BIW_KNB1_S_STR-LOEVM sy-vline 
WA_BIW_KNB1_S_STR-ZUAWA sy-vline 
WA_BIW_KNB1_S_STR-BUSAB sy-vline 
WA_BIW_KNB1_S_STR-AKONT sy-vline 
WA_BIW_KNB1_S_STR-BEGRU sy-vline 
WA_BIW_KNB1_S_STR-KNRZE sy-vline 
WA_BIW_KNB1_S_STR-KNRZB sy-vline 
WA_BIW_KNB1_S_STR-ZAMIM sy-vline 
WA_BIW_KNB1_S_STR-ZAMIV sy-vline 
WA_BIW_KNB1_S_STR-ZAMIR sy-vline 
WA_BIW_KNB1_S_STR-ZAMIB sy-vline 
WA_BIW_KNB1_S_STR-ZAMIO sy-vline 
WA_BIW_KNB1_S_STR-ZWELS sy-vline 
WA_BIW_KNB1_S_STR-XVERR sy-vline 
WA_BIW_KNB1_S_STR-ZAHLS sy-vline 
WA_BIW_KNB1_S_STR-ZTERM sy-vline 
WA_BIW_KNB1_S_STR-WAKON sy-vline 
WA_BIW_KNB1_S_STR-VZSKZ sy-vline 
WA_BIW_KNB1_S_STR-EIKTO sy-vline 
WA_BIW_KNB1_S_STR-ZSABE sy-vline 
WA_BIW_KNB1_S_STR-KVERM sy-vline 
WA_BIW_KNB1_S_STR-FDGRV sy-vline 
WA_BIW_KNB1_S_STR-VRBKZ sy-vline 
WA_BIW_KNB1_S_STR-VRSZL sy-vline 
WA_BIW_KNB1_S_STR-VRSPR sy-vline 
WA_BIW_KNB1_S_STR-VRSNR sy-vline 
WA_BIW_KNB1_S_STR-VERDT sy-vline 
WA_BIW_KNB1_S_STR-PERKZ sy-vline 
WA_BIW_KNB1_S_STR-XDEZV sy-vline 
WA_BIW_KNB1_S_STR-XAUSZ sy-vline 
WA_BIW_KNB1_S_STR-REMIT sy-vline 
WA_BIW_KNB1_S_STR-DATLZ sy-vline 
WA_BIW_KNB1_S_STR-XZVER sy-vline 
WA_BIW_KNB1_S_STR-TOGRU sy-vline 
WA_BIW_KNB1_S_STR-KULTG sy-vline 
WA_BIW_KNB1_S_STR-HBKID sy-vline 
WA_BIW_KNB1_S_STR-XPORE sy-vline 
WA_BIW_KNB1_S_STR-BLNKZ sy-vline 
WA_BIW_KNB1_S_STR-ALTKN sy-vline 
WA_BIW_KNB1_S_STR-ZGRUP sy-vline 
WA_BIW_KNB1_S_STR-URLID sy-vline 
WA_BIW_KNB1_S_STR-MGRUP sy-vline 
WA_BIW_KNB1_S_STR-LOCKB sy-vline 
WA_BIW_KNB1_S_STR-UZAWE sy-vline 
WA_BIW_KNB1_S_STR-EKVBD sy-vline 
WA_BIW_KNB1_S_STR-SREGL sy-vline 
WA_BIW_KNB1_S_STR-XEDIP sy-vline 
WA_BIW_KNB1_S_STR-FRGRP sy-vline 
WA_BIW_KNB1_S_STR-VRSDG sy-vline 
WA_BIW_KNB1_S_STR-TLFXS sy-vline 
WA_BIW_KNB1_S_STR-INTAD sy-vline 
WA_BIW_KNB1_S_STR-XKNZB sy-vline 
WA_BIW_KNB1_S_STR-GUZTE sy-vline 
WA_BIW_KNB1_S_STR-GRICD sy-vline 
WA_BIW_KNB1_S_STR-GRIDT sy-vline 
WA_BIW_KNB1_S_STR-WBRSL sy-vline 
WA_BIW_KNB1_S_STR-CONFS sy-vline 
WA_BIW_KNB1_S_STR-UPDAT sy-vline 
WA_BIW_KNB1_S_STR-UPTIM sy-vline 
WA_BIW_KNB1_S_STR-NODEL sy-vline 
WA_BIW_KNB1_S_STR-TLFNS sy-vline 
WA_BIW_KNB1_S_STR-CESSION_KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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