ABAP Select data from SAP table RNC301DY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNC301DY 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 RNC301DY. 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 RNC301DY 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_RNC301DY TYPE STANDARD TABLE OF RNC301DY,
      WA_RNC301DY TYPE RNC301DY,
      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: <RNC301DY> TYPE RNC301DY.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNC301DY.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNC301DY
  INTO TABLE IT_RNC301DY.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNC301DY
*  INTO TABLE @DATA(IT_RNC301DY2).
*--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_RNC301DY INDEX 1 INTO DATA(WA_RNC301DY2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNC301DY ASSIGNING <RNC301DY>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNC301DY>-MANDT = 1.
<RNC301DY>-EINRI = 1.
<RNC301DY>-LF301 = 1.
<RNC301DY>-DAS301 = 1.
<RNC301DY>-INSIGN = 1.

ENDLOOP.

LOOP AT IT_RNC301DY INTO WA_RNC301DY.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNC301DY-OUTSIGN, sy-vline,
  WA_RNC301DY-LF301M, sy-vline,
  WA_RNC301DY-LF301D, sy-vline,
  WA_RNC301DY-NOINFILE, sy-vline,
  WA_RNC301DY-ERDATFROM, sy-vline,
  WA_RNC301DY-ERDATTO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNC301DY 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_RNC301DY 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_RNC301DY INTO WA_RNC301DY.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LF301
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-LF301
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-LF301.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LF301D
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-LF301D
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-LF301D.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NOINFILE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-NOINFILE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-NOINFILE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXTAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNC301DY-EXTAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNC301DY-EXTAUFNR.
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_RNC301DY_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
LF301 TYPE STRING,
DAS301 TYPE STRING,
INSIGN TYPE STRING,
OUTSIGN TYPE STRING,
LF301M TYPE STRING,
LF301D TYPE STRING,
NOINFILE TYPE STRING,
ERDATFROM TYPE STRING,
ERDATTO TYPE STRING,
FALNR TYPE STRING,
FZIFF TYPE STRING,
EDIPROC TYPE STRING,
REG301CD TYPE STRING,
EXTAUFNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNC301DY_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_RNC301DY_STR-MANDT sy-vline 
WA_RNC301DY_STR-EINRI sy-vline 
WA_RNC301DY_STR-LF301 sy-vline 
WA_RNC301DY_STR-DAS301 sy-vline 
WA_RNC301DY_STR-INSIGN sy-vline 
WA_RNC301DY_STR-OUTSIGN sy-vline 
WA_RNC301DY_STR-LF301M sy-vline 
WA_RNC301DY_STR-LF301D sy-vline 
WA_RNC301DY_STR-NOINFILE sy-vline 
WA_RNC301DY_STR-ERDATFROM sy-vline 
WA_RNC301DY_STR-ERDATTO sy-vline 
WA_RNC301DY_STR-FALNR sy-vline 
WA_RNC301DY_STR-FZIFF sy-vline 
WA_RNC301DY_STR-EDIPROC sy-vline 
WA_RNC301DY_STR-REG301CD sy-vline 
WA_RNC301DY_STR-EXTAUFNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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