ABAP Select data from SAP table RCN10 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCN10 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 RCN10. 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 RCN10 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_RCN10 TYPE STANDARD TABLE OF RCN10,
      WA_RCN10 TYPE RCN10,
      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: <RCN10> TYPE RCN10.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RCN10.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RCN10
  INTO TABLE IT_RCN10.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCN10
*  INTO TABLE @DATA(IT_RCN102).
*--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_RCN10 INDEX 1 INTO DATA(WA_RCN102).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RCN10 ASSIGNING <RCN10>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCN10>-STDNR = 1.
<RCN10>-STDAL = 1.
<RCN10>-KTEXT = 1.
<RCN10>-OPR_START = 1.
<RCN10>-OPR_END = 1.

ENDLOOP.

LOOP AT IT_RCN10 INTO WA_RCN10.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCN10-INDX_START, sy-vline,
  WA_RCN10-INDX_END, sy-vline,
  WA_RCN10-VORNR, sy-vline,
  WA_RCN10-ELMNR, sy-vline,
  WA_RCN10-LTXA1, sy-vline,
  WA_RCN10-FLG_INT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCN10 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_RCN10 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_RCN10 INTO WA_RCN10.


*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 STDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-STDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-STDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STDAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-STDAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-STDAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field OPR_START
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-OPR_START
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-OPR_START.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field OPR_END
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-OPR_END
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-OPR_END.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field ELMNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-ELMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-ELMNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VRGNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-VRGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-VRGNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field UVORN
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-UVORN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-UVORN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field PVZNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-PVZNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-PVZNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STEP_VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCN10-STEP_VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCN10-STEP_VORNR.
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_RCN10_STR, 
STDNR TYPE STRING,
STDAL TYPE STRING,
KTEXT TYPE STRING,
OPR_START TYPE STRING,
OPR_END TYPE STRING,
INDX_START TYPE STRING,
INDX_END TYPE STRING,
VORNR TYPE STRING,
ELMNR TYPE STRING,
LTXA1 TYPE STRING,
FLG_INT TYPE STRING,
FLG_EXT TYPE STRING,
FLG_COST TYPE STRING,
SUMNR TYPE STRING,
MODIF TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
VRGNR TYPE STRING,
UVORN TYPE STRING,
PVZNR TYPE STRING,
PHFLG TYPE STRING,
PVZKN TYPE STRING,
PHSEQ TYPE STRING,
WERKS TYPE STRING,
STEP_VORNR TYPE STRING,
FLG_SERV TYPE STRING,
PLNKN TYPE STRING,
FLG_ACTY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCN10_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_RCN10_STR-STDNR sy-vline 
WA_RCN10_STR-STDAL sy-vline 
WA_RCN10_STR-KTEXT sy-vline 
WA_RCN10_STR-OPR_START sy-vline 
WA_RCN10_STR-OPR_END sy-vline 
WA_RCN10_STR-INDX_START sy-vline 
WA_RCN10_STR-INDX_END sy-vline 
WA_RCN10_STR-VORNR sy-vline 
WA_RCN10_STR-ELMNR sy-vline 
WA_RCN10_STR-LTXA1 sy-vline 
WA_RCN10_STR-FLG_INT sy-vline 
WA_RCN10_STR-FLG_EXT sy-vline 
WA_RCN10_STR-FLG_COST sy-vline 
WA_RCN10_STR-SUMNR sy-vline 
WA_RCN10_STR-MODIF sy-vline 
WA_RCN10_STR-PLNNR sy-vline 
WA_RCN10_STR-PLNAL sy-vline 
WA_RCN10_STR-VRGNR sy-vline 
WA_RCN10_STR-UVORN sy-vline 
WA_RCN10_STR-PVZNR sy-vline 
WA_RCN10_STR-PHFLG sy-vline 
WA_RCN10_STR-PVZKN sy-vline 
WA_RCN10_STR-PHSEQ sy-vline 
WA_RCN10_STR-WERKS sy-vline 
WA_RCN10_STR-STEP_VORNR sy-vline 
WA_RCN10_STR-FLG_SERV sy-vline 
WA_RCN10_STR-PLNKN sy-vline 
WA_RCN10_STR-FLG_ACTY sy-vline      INTO ld_text SEPARATED BY SPACE.

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