ABAP Select data from SAP table RKCTNOV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKCTNOV
*  INTO TABLE @DATA(IT_RKCTNOV2).
*--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_RKCTNOV INDEX 1 INTO DATA(WA_RKCTNOV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKCTNOV>-VERSIO = 1.
<RKCTNOV>-PLACTI = 1.
<RKCTNOV>-YEARB = 1.
<RKCTNOV>-PERDE = 1.
<RKCTNOV>-BUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKCTNOV-BUPTR, sy-vline,
  WA_RKCTNOV-CGPER, sy-vline,
  WA_RKCTNOV-CGYEA, sy-vline,
  WA_RKCTNOV-CONGR, sy-vline,
  WA_RKCTNOV-DIMEN, sy-vline,
  WA_RKCTNOV-DOCTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKCTNOV 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_RKCTNOV 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_RKCTNOV INTO WA_RKCTNOV.


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

*Conversion exit GJAHR, internal->external for field YEARB
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-YEARB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-YEARB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AFIMC, internal->external for field BUNIT
CALL FUNCTION 'CONVERSION_EXIT_AFIMC_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-BUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-BUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AFIMC, internal->external for field BUPTR
CALL FUNCTION 'CONVERSION_EXIT_AFIMC_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-BUPTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-BUPTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field CGYEA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-CGYEA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-CGYEA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AFIMC, internal->external for field CONGR
CALL FUNCTION 'CONVERSION_EXIT_AFIMC_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-CONGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-CONGR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit BFIMC, internal->external for field ITEM
CALL FUNCTION 'CONVERSION_EXIT_BFIMC_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-ITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-ITEM.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit INVGJ, internal->external for field RYEAR
CALL FUNCTION 'CONVERSION_EXIT_INVGJ_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-RYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-RYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field HB3GC
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RKCTNOV-HB3GC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKCTNOV-HB3GC.
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_RKCTNOV_STR, 
VERSIO TYPE STRING,
PLACTI TYPE STRING,
YEARB TYPE STRING,
PERDE TYPE STRING,
BUNIT TYPE STRING,
BUPTR TYPE STRING,
CGPER TYPE STRING,
CGYEA TYPE STRING,
CONGR TYPE STRING,
DIMEN TYPE STRING,
DOCTY TYPE STRING,
ITCLG TYPE STRING,
ITEM TYPE STRING,
RVERS TYPE STRING,
SITEM TYPE STRING,
SITYP TYPE STRING,
COUNTR TYPE STRING,
RYEAR TYPE STRING,
PLEVL TYPE STRING,
TF164_CURR TYPE STRING,
HB3GC TYPE STRING,
HB2LC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKCTNOV_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_RKCTNOV_STR-VERSIO sy-vline 
WA_RKCTNOV_STR-PLACTI sy-vline 
WA_RKCTNOV_STR-YEARB sy-vline 
WA_RKCTNOV_STR-PERDE sy-vline 
WA_RKCTNOV_STR-BUNIT sy-vline 
WA_RKCTNOV_STR-BUPTR sy-vline 
WA_RKCTNOV_STR-CGPER sy-vline 
WA_RKCTNOV_STR-CGYEA sy-vline 
WA_RKCTNOV_STR-CONGR sy-vline 
WA_RKCTNOV_STR-DIMEN sy-vline 
WA_RKCTNOV_STR-DOCTY sy-vline 
WA_RKCTNOV_STR-ITCLG sy-vline 
WA_RKCTNOV_STR-ITEM sy-vline 
WA_RKCTNOV_STR-RVERS sy-vline 
WA_RKCTNOV_STR-SITEM sy-vline 
WA_RKCTNOV_STR-SITYP sy-vline 
WA_RKCTNOV_STR-COUNTR sy-vline 
WA_RKCTNOV_STR-RYEAR sy-vline 
WA_RKCTNOV_STR-PLEVL sy-vline 
WA_RKCTNOV_STR-TF164_CURR sy-vline 
WA_RKCTNOV_STR-HB3GC sy-vline 
WA_RKCTNOV_STR-HB2LC sy-vline      INTO ld_text SEPARATED BY SPACE.

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