ABAP Select data from SAP table RJU_KNBU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJU_KNBU
*  INTO TABLE @DATA(IT_RJU_KNBU2).
*--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_RJU_KNBU INDEX 1 INTO DATA(WA_RJU_KNBU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJU_KNBU>-KTRLBLK = 1.
<RJU_KNBU>-KTNRB = 1.
<RJU_KNBU>-BUKRB = 1.
<RJU_KNBU>-RESKEY = 1.
<RJU_KNBU>-ERDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJU_KNBU-ERNAM, sy-vline,
  WA_RJU_KNBU-SGCTL, sy-vline,
  WA_RJU_KNBU-LOEKB, sy-vline,
  WA_RJU_KNBU-LOEVB, sy-vline,
  WA_RJU_KNBU-LAGLZ, sy-vline,
  WA_RJU_KNBU-ZUAWA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJU_KNBU 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_RJU_KNBU 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_RJU_KNBU INTO WA_RJU_KNBU.


*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_RJU_KNBU_STR, 
KTRLBLK TYPE STRING,
KTNRB TYPE STRING,
BUKRB TYPE STRING,
RESKEY TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
SGCTL TYPE STRING,
LOEKB TYPE STRING,
LOEVB TYPE STRING,
LAGLZ TYPE STRING,
ZUAWA TYPE STRING,
VBUND TYPE STRING,
BUSAB TYPE STRING,
AKONT TYPE STRING,
DUMMY1 TYPE STRING,
BEGRU TYPE STRING,
VZSKZ TYPE STRING,
KBVER TYPE STRING,
GBRKZ TYPE STRING,
KNRZE TYPE STRING,
KDLIF TYPE STRING,
KDRCH TYPE STRING,
ZAMIT TYPE STRING,
ZAHLA TYPE STRING,
ZLSCH TYPE STRING,
DUMMY2 TYPE STRING,
ZTERM TYPE STRING,
DUMMY3 TYPE STRING,
PERRN TYPE STRING,
RZAHL TYPE STRING,
SONAB TYPE STRING,
WKOND TYPE STRING,
WAKON TYPE STRING,
DUMMY4 TYPE STRING,
MAHNS TYPE STRING,
MSCHL TYPE STRING,
MANST TYPE STRING,
MANDT TYPE STRING,
MANZL TYPE STRING,
MAHNA TYPE STRING,
DLAUS TYPE STRING,
GMVDT TYPE STRING,
KNRMA TYPE STRING,
DUMMY5 TYPE STRING,
EIKTO TYPE STRING,
ZSABE TYPE STRING,
KVERM TYPE STRING,
DUMMY6 TYPE STRING,
DUMMY7 TYPE STRING,
DUMMY8 TYPE STRING,
DUMMY9 TYPE STRING,
DUMMY10 TYPE STRING,
DUMMY11 TYPE STRING,
DUMMY12 TYPE STRING,
DUMMY13 TYPE STRING,
DUMMY14 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJU_KNBU_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_RJU_KNBU_STR-KTRLBLK sy-vline 
WA_RJU_KNBU_STR-KTNRB sy-vline 
WA_RJU_KNBU_STR-BUKRB sy-vline 
WA_RJU_KNBU_STR-RESKEY sy-vline 
WA_RJU_KNBU_STR-ERDAT sy-vline 
WA_RJU_KNBU_STR-ERNAM sy-vline 
WA_RJU_KNBU_STR-SGCTL sy-vline 
WA_RJU_KNBU_STR-LOEKB sy-vline 
WA_RJU_KNBU_STR-LOEVB sy-vline 
WA_RJU_KNBU_STR-LAGLZ sy-vline 
WA_RJU_KNBU_STR-ZUAWA sy-vline 
WA_RJU_KNBU_STR-VBUND sy-vline 
WA_RJU_KNBU_STR-BUSAB sy-vline 
WA_RJU_KNBU_STR-AKONT sy-vline 
WA_RJU_KNBU_STR-DUMMY1 sy-vline 
WA_RJU_KNBU_STR-BEGRU sy-vline 
WA_RJU_KNBU_STR-VZSKZ sy-vline 
WA_RJU_KNBU_STR-KBVER sy-vline 
WA_RJU_KNBU_STR-GBRKZ sy-vline 
WA_RJU_KNBU_STR-KNRZE sy-vline 
WA_RJU_KNBU_STR-KDLIF sy-vline 
WA_RJU_KNBU_STR-KDRCH sy-vline 
WA_RJU_KNBU_STR-ZAMIT sy-vline 
WA_RJU_KNBU_STR-ZAHLA sy-vline 
WA_RJU_KNBU_STR-ZLSCH sy-vline 
WA_RJU_KNBU_STR-DUMMY2 sy-vline 
WA_RJU_KNBU_STR-ZTERM sy-vline 
WA_RJU_KNBU_STR-DUMMY3 sy-vline 
WA_RJU_KNBU_STR-PERRN sy-vline 
WA_RJU_KNBU_STR-RZAHL sy-vline 
WA_RJU_KNBU_STR-SONAB sy-vline 
WA_RJU_KNBU_STR-WKOND sy-vline 
WA_RJU_KNBU_STR-WAKON sy-vline 
WA_RJU_KNBU_STR-DUMMY4 sy-vline 
WA_RJU_KNBU_STR-MAHNS sy-vline 
WA_RJU_KNBU_STR-MSCHL sy-vline 
WA_RJU_KNBU_STR-MANST sy-vline 
WA_RJU_KNBU_STR-MANDT sy-vline 
WA_RJU_KNBU_STR-MANZL sy-vline 
WA_RJU_KNBU_STR-MAHNA sy-vline 
WA_RJU_KNBU_STR-DLAUS sy-vline 
WA_RJU_KNBU_STR-GMVDT sy-vline 
WA_RJU_KNBU_STR-KNRMA sy-vline 
WA_RJU_KNBU_STR-DUMMY5 sy-vline 
WA_RJU_KNBU_STR-EIKTO sy-vline 
WA_RJU_KNBU_STR-ZSABE sy-vline 
WA_RJU_KNBU_STR-KVERM sy-vline 
WA_RJU_KNBU_STR-DUMMY6 sy-vline 
WA_RJU_KNBU_STR-DUMMY7 sy-vline 
WA_RJU_KNBU_STR-DUMMY8 sy-vline 
WA_RJU_KNBU_STR-DUMMY9 sy-vline 
WA_RJU_KNBU_STR-DUMMY10 sy-vline 
WA_RJU_KNBU_STR-DUMMY11 sy-vline 
WA_RJU_KNBU_STR-DUMMY12 sy-vline 
WA_RJU_KNBU_STR-DUMMY13 sy-vline 
WA_RJU_KNBU_STR-DUMMY14 sy-vline      INTO ld_text SEPARATED BY SPACE.

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