ABAP Select data from SAP table KNB1_MEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNB1_MEM 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 KNB1_MEM. 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 KNB1_MEM 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_KNB1_MEM TYPE STANDARD TABLE OF KNB1_MEM,
      WA_KNB1_MEM TYPE KNB1_MEM,
      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: <KNB1_MEM> TYPE KNB1_MEM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KNB1_MEM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KNB1_MEM
  INTO TABLE IT_KNB1_MEM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNB1_MEM
*  INTO TABLE @DATA(IT_KNB1_MEM2).
*--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_KNB1_MEM INDEX 1 INTO DATA(WA_KNB1_MEM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KNB1_MEM ASSIGNING <KNB1_MEM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNB1_MEM>-MANDT = 1.
<KNB1_MEM>-KUNNR = 1.
<KNB1_MEM>-BUKRS = 1.
<KNB1_MEM>-PERNR = 1.
<KNB1_MEM>-KNB1_EEW_CC = 1.

ENDLOOP.

LOOP AT IT_KNB1_MEM INTO WA_KNB1_MEM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNB1_MEM-ERDAT, sy-vline,
  WA_KNB1_MEM-ERNAM, sy-vline,
  WA_KNB1_MEM-SPERR, sy-vline,
  WA_KNB1_MEM-LOEVM, sy-vline,
  WA_KNB1_MEM-ZUAWA, sy-vline,
  WA_KNB1_MEM-BUSAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNB1_MEM 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_KNB1_MEM 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_KNB1_MEM INTO WA_KNB1_MEM.


*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_KNB1_MEM-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-AKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-AKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-KNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-KNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-KNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-KNRZB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REMIT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-REMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-REMIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EKVBD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNB1_MEM-EKVBD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNB1_MEM-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_KNB1_MEM_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
BUKRS TYPE STRING,
PERNR TYPE STRING,
KNB1_EEW_CC 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,
ZINDT TYPE STRING,
ZINRT TYPE STRING,
EIKTO TYPE STRING,
ZSABE TYPE STRING,
KVERM TYPE STRING,
FDGRV TYPE STRING,
VRBKZ TYPE STRING,
VLIBB TYPE STRING,
VRSZL TYPE STRING,
VRSPR TYPE STRING,
VRSNR TYPE STRING,
VERDT TYPE STRING,
PERKZ TYPE STRING,
XDEZV TYPE STRING,
XAUSZ TYPE STRING,
WEBTR 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,
AVSND TYPE STRING,
AD_HASH TYPE STRING,
QLAND TYPE STRING,
CVP_XBLCK_B TYPE STRING,
CIIUCODE TYPE STRING,
PAYMENTCLEARINGGRPID TYPE STRING,
PAYTRSN TYPE STRING,
GMVKZD TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNB1_MEM_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_KNB1_MEM_STR-MANDT sy-vline 
WA_KNB1_MEM_STR-KUNNR sy-vline 
WA_KNB1_MEM_STR-BUKRS sy-vline 
WA_KNB1_MEM_STR-PERNR sy-vline 
WA_KNB1_MEM_STR-KNB1_EEW_CC sy-vline 
WA_KNB1_MEM_STR-ERDAT sy-vline 
WA_KNB1_MEM_STR-ERNAM sy-vline 
WA_KNB1_MEM_STR-SPERR sy-vline 
WA_KNB1_MEM_STR-LOEVM sy-vline 
WA_KNB1_MEM_STR-ZUAWA sy-vline 
WA_KNB1_MEM_STR-BUSAB sy-vline 
WA_KNB1_MEM_STR-AKONT sy-vline 
WA_KNB1_MEM_STR-BEGRU sy-vline 
WA_KNB1_MEM_STR-KNRZE sy-vline 
WA_KNB1_MEM_STR-KNRZB sy-vline 
WA_KNB1_MEM_STR-ZAMIM sy-vline 
WA_KNB1_MEM_STR-ZAMIV sy-vline 
WA_KNB1_MEM_STR-ZAMIR sy-vline 
WA_KNB1_MEM_STR-ZAMIB sy-vline 
WA_KNB1_MEM_STR-ZAMIO sy-vline 
WA_KNB1_MEM_STR-ZWELS sy-vline 
WA_KNB1_MEM_STR-XVERR sy-vline 
WA_KNB1_MEM_STR-ZAHLS sy-vline 
WA_KNB1_MEM_STR-ZTERM sy-vline 
WA_KNB1_MEM_STR-WAKON sy-vline 
WA_KNB1_MEM_STR-VZSKZ sy-vline 
WA_KNB1_MEM_STR-ZINDT sy-vline 
WA_KNB1_MEM_STR-ZINRT sy-vline 
WA_KNB1_MEM_STR-EIKTO sy-vline 
WA_KNB1_MEM_STR-ZSABE sy-vline 
WA_KNB1_MEM_STR-KVERM sy-vline 
WA_KNB1_MEM_STR-FDGRV sy-vline 
WA_KNB1_MEM_STR-VRBKZ sy-vline 
WA_KNB1_MEM_STR-VLIBB sy-vline 
WA_KNB1_MEM_STR-VRSZL sy-vline 
WA_KNB1_MEM_STR-VRSPR sy-vline 
WA_KNB1_MEM_STR-VRSNR sy-vline 
WA_KNB1_MEM_STR-VERDT sy-vline 
WA_KNB1_MEM_STR-PERKZ sy-vline 
WA_KNB1_MEM_STR-XDEZV sy-vline 
WA_KNB1_MEM_STR-XAUSZ sy-vline 
WA_KNB1_MEM_STR-WEBTR sy-vline 
WA_KNB1_MEM_STR-REMIT sy-vline 
WA_KNB1_MEM_STR-DATLZ sy-vline 
WA_KNB1_MEM_STR-XZVER sy-vline 
WA_KNB1_MEM_STR-TOGRU sy-vline 
WA_KNB1_MEM_STR-KULTG sy-vline 
WA_KNB1_MEM_STR-HBKID sy-vline 
WA_KNB1_MEM_STR-XPORE sy-vline 
WA_KNB1_MEM_STR-BLNKZ sy-vline 
WA_KNB1_MEM_STR-ALTKN sy-vline 
WA_KNB1_MEM_STR-ZGRUP sy-vline 
WA_KNB1_MEM_STR-URLID sy-vline 
WA_KNB1_MEM_STR-MGRUP sy-vline 
WA_KNB1_MEM_STR-LOCKB sy-vline 
WA_KNB1_MEM_STR-UZAWE sy-vline 
WA_KNB1_MEM_STR-EKVBD sy-vline 
WA_KNB1_MEM_STR-SREGL sy-vline 
WA_KNB1_MEM_STR-XEDIP sy-vline 
WA_KNB1_MEM_STR-FRGRP sy-vline 
WA_KNB1_MEM_STR-VRSDG sy-vline 
WA_KNB1_MEM_STR-TLFXS sy-vline 
WA_KNB1_MEM_STR-INTAD sy-vline 
WA_KNB1_MEM_STR-XKNZB sy-vline 
WA_KNB1_MEM_STR-GUZTE sy-vline 
WA_KNB1_MEM_STR-GRICD sy-vline 
WA_KNB1_MEM_STR-GRIDT sy-vline 
WA_KNB1_MEM_STR-WBRSL sy-vline 
WA_KNB1_MEM_STR-CONFS sy-vline 
WA_KNB1_MEM_STR-UPDAT sy-vline 
WA_KNB1_MEM_STR-UPTIM sy-vline 
WA_KNB1_MEM_STR-NODEL sy-vline 
WA_KNB1_MEM_STR-TLFNS sy-vline 
WA_KNB1_MEM_STR-CESSION_KZ sy-vline 
WA_KNB1_MEM_STR-AVSND sy-vline 
WA_KNB1_MEM_STR-AD_HASH sy-vline 
WA_KNB1_MEM_STR-QLAND sy-vline 
WA_KNB1_MEM_STR-CVP_XBLCK_B sy-vline 
WA_KNB1_MEM_STR-CIIUCODE sy-vline 
WA_KNB1_MEM_STR-PAYMENTCLEARINGGRPID sy-vline 
WA_KNB1_MEM_STR-PAYTRSN sy-vline 
WA_KNB1_MEM_STR-GMVKZD sy-vline 
WA_KNB1_MEM_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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