ABAP Select data from SAP table RN1CANCEL_TREE_FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1CANCEL_TREE_FIELDS 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 RN1CANCEL_TREE_FIELDS. 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 RN1CANCEL_TREE_FIELDS 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_RN1CANCEL_TREE_FIELDS TYPE STANDARD TABLE OF RN1CANCEL_TREE_FIELDS,
      WA_RN1CANCEL_TREE_FIELDS TYPE RN1CANCEL_TREE_FIELDS,
      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: <RN1CANCEL_TREE_FIELDS> TYPE RN1CANCEL_TREE_FIELDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1CANCEL_TREE_FIELDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1CANCEL_TREE_FIELDS
  INTO TABLE IT_RN1CANCEL_TREE_FIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1CANCEL_TREE_FIELDS
*  INTO TABLE @DATA(IT_RN1CANCEL_TREE_FIELDS2).
*--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_RN1CANCEL_TREE_FIELDS INDEX 1 INTO DATA(WA_RN1CANCEL_TREE_FIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1CANCEL_TREE_FIELDS ASSIGNING <RN1CANCEL_TREE_FIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1CANCEL_TREE_FIELDS>-OBJECT = 1.
<RN1CANCEL_TREE_FIELDS>-EINRI = 1.
<RN1CANCEL_TREE_FIELDS>-FALNR = 1.
<RN1CANCEL_TREE_FIELDS>-LNRLS = 1.
<RN1CANCEL_TREE_FIELDS>-LFDBEW = 1.

ENDLOOP.

LOOP AT IT_RN1CANCEL_TREE_FIELDS INTO WA_RN1CANCEL_TREE_FIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1CANCEL_TREE_FIELDS-DATATYPE, sy-vline,
  WA_RN1CANCEL_TREE_FIELDS-LINE_KEY, sy-vline,
  WA_RN1CANCEL_TREE_FIELDS-PATNR, sy-vline,
  WA_RN1CANCEL_TREE_FIELDS-PAPID, sy-vline,
  WA_RN1CANCEL_TREE_FIELDS-GROUP_NR, sy-vline,
  WA_RN1CANCEL_TREE_FIELDS-DEPENDENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1CANCEL_TREE_FIELDS 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_RN1CANCEL_TREE_FIELDS 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_RN1CANCEL_TREE_FIELDS INTO WA_RN1CANCEL_TREE_FIELDS.


*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_RN1CANCEL_TREE_FIELDS-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1CANCEL_TREE_FIELDS-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1CANCEL_TREE_FIELDS-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1CANCEL_TREE_FIELDS-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PAPID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1CANCEL_TREE_FIELDS-PAPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-PAPID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CAOU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1CANCEL_TREE_FIELDS-CAOU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1CANCEL_TREE_FIELDS-CAOU.
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_RN1CANCEL_TREE_FIELDS_STR, 
OBJECT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LNRLS TYPE STRING,
LFDBEW TYPE STRING,
DATATYPE TYPE STRING,
LINE_KEY TYPE STRING,
PATNR TYPE STRING,
PAPID TYPE STRING,
GROUP_NR TYPE STRING,
DEPENDENT TYPE STRING,
TYPE TYPE STRING,
MARK TYPE STRING,
ICON TYPE STRING,
NODE_KEY TYPE STRING,
PATNAME TYPE STRING,
CATEXT TYPE STRING,
CADATE TYPE STRING,
CATIME TYPE STRING,
CAOU TYPE STRING,
CAGPART TYPE STRING,
CASTATE TYPE STRING,
CACLASS TYPE STRING,
CAKEY TYPE STRING,
CACOTEXT TYPE STRING,
CACOICON TYPE STRING,
CAUSECHNG TYPE STRING,
CAUSEICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1CANCEL_TREE_FIELDS_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_RN1CANCEL_TREE_FIELDS_STR-OBJECT sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-EINRI sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-FALNR sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-LNRLS sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-LFDBEW sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-DATATYPE sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-LINE_KEY sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-PATNR sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-PAPID sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-GROUP_NR sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-DEPENDENT sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-TYPE sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-MARK sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-ICON sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-NODE_KEY sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-PATNAME sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CATEXT sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CADATE sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CATIME sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CAOU sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CAGPART sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CASTATE sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CACLASS sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CAKEY sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CACOTEXT sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CACOICON sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CAUSECHNG sy-vline 
WA_RN1CANCEL_TREE_FIELDS_STR-CAUSEICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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