ABAP Select data from SAP table RJKWBZ_KNAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJKWBZ_KNAT
*  INTO TABLE @DATA(IT_RJKWBZ_KNAT2).
*--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_RJKWBZ_KNAT INDEX 1 INTO DATA(WA_RJKWBZ_KNAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJKWBZ_KNAT>-WBZSATZART = 1.
<RJKWBZ_KNAT>-VERLAGSNR = 1.
<RJKWBZ_KNAT>-WBZKUNNR = 1.
<RJKWBZ_KNAT>-VERTRKENNZ = 1.
<RJKWBZ_KNAT>-RECHZENTNR_NEU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJKWBZ_KNAT-WBZVORGART, sy-vline,
  WA_RJKWBZ_KNAT-ABONR, sy-vline,
  WA_RJKWBZ_KNAT-FILLER_8, sy-vline,
  WA_RJKWBZ_KNAT-PLZ, sy-vline,
  WA_RJKWBZ_KNAT-FILLER_9A, sy-vline,
  WA_RJKWBZ_KNAT-LAND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJKWBZ_KNAT 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_RJKWBZ_KNAT 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_RJKWBZ_KNAT INTO WA_RJKWBZ_KNAT.


*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 JKWBZ, internal->external for field VERLAGSNR
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-VERLAGSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-VERLAGSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field WBZKUNNR
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-WBZKUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-WBZKUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field VERTRKENNZ
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-VERTRKENNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-VERTRKENNZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field RECHZENTNR_NEU
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-RECHZENTNR_NEU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-RECHZENTNR_NEU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field ABONR
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-ABONR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-ABONR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field WBZKUNNR_NEU
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-WBZKUNNR_NEU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-WBZKUNNR_NEU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field VERTRKENNZ_NEU
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-VERTRKENNZ_NEU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-VERTRKENNZ_NEU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field ABONR_NEU
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-ABONR_NEU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-ABONR_NEU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field WBZABOKUNR_NEU
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-WBZABOKUNR_NEU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-WBZABOKUNR_NEU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit JKWBZ, internal->external for field WBZABOKUNR
CALL FUNCTION 'CONVERSION_EXIT_JKWBZ_OUTPUT'
  EXPORTING
    input =                      WA_RJKWBZ_KNAT-WBZABOKUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKWBZ_KNAT-WBZABOKUNR.
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_RJKWBZ_KNAT_STR, 
WBZSATZART TYPE STRING,
VERLAGSNR TYPE STRING,
WBZKUNNR TYPE STRING,
VERTRKENNZ TYPE STRING,
RECHZENTNR_NEU TYPE STRING,
WBZVORGART TYPE STRING,
ABONR TYPE STRING,
FILLER_8 TYPE STRING,
PLZ TYPE STRING,
FILLER_9A TYPE STRING,
LAND TYPE STRING,
ANREDE TYPE STRING,
NAME TYPE STRING,
ANSCHZUS TYPE STRING,
ANSCHZUSKZ TYPE STRING,
STRASSE TYPE STRING,
ORT TYPE STRING,
WBZKUNNR_NEU TYPE STRING,
VERTRKENNZ_NEU TYPE STRING,
ABONR_NEU TYPE STRING,
WBZABOKUNR_NEU TYPE STRING,
FILLER_20 TYPE STRING,
WBZABOKUNR TYPE STRING,
FILLER_22 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJKWBZ_KNAT_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_RJKWBZ_KNAT_STR-WBZSATZART sy-vline 
WA_RJKWBZ_KNAT_STR-VERLAGSNR sy-vline 
WA_RJKWBZ_KNAT_STR-WBZKUNNR sy-vline 
WA_RJKWBZ_KNAT_STR-VERTRKENNZ sy-vline 
WA_RJKWBZ_KNAT_STR-RECHZENTNR_NEU sy-vline 
WA_RJKWBZ_KNAT_STR-WBZVORGART sy-vline 
WA_RJKWBZ_KNAT_STR-ABONR sy-vline 
WA_RJKWBZ_KNAT_STR-FILLER_8 sy-vline 
WA_RJKWBZ_KNAT_STR-PLZ sy-vline 
WA_RJKWBZ_KNAT_STR-FILLER_9A sy-vline 
WA_RJKWBZ_KNAT_STR-LAND sy-vline 
WA_RJKWBZ_KNAT_STR-ANREDE sy-vline 
WA_RJKWBZ_KNAT_STR-NAME sy-vline 
WA_RJKWBZ_KNAT_STR-ANSCHZUS sy-vline 
WA_RJKWBZ_KNAT_STR-ANSCHZUSKZ sy-vline 
WA_RJKWBZ_KNAT_STR-STRASSE sy-vline 
WA_RJKWBZ_KNAT_STR-ORT sy-vline 
WA_RJKWBZ_KNAT_STR-WBZKUNNR_NEU sy-vline 
WA_RJKWBZ_KNAT_STR-VERTRKENNZ_NEU sy-vline 
WA_RJKWBZ_KNAT_STR-ABONR_NEU sy-vline 
WA_RJKWBZ_KNAT_STR-WBZABOKUNR_NEU sy-vline 
WA_RJKWBZ_KNAT_STR-FILLER_20 sy-vline 
WA_RJKWBZ_KNAT_STR-WBZABOKUNR sy-vline 
WA_RJKWBZ_KNAT_STR-FILLER_22 sy-vline      INTO ld_text SEPARATED BY SPACE.

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