ABAP Select data from SAP table RN1_CANCEL_SNAPSHOT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1_CANCEL_SNAPSHOT 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 RN1_CANCEL_SNAPSHOT. 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 RN1_CANCEL_SNAPSHOT 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_RN1_CANCEL_SNAPSHOT TYPE STANDARD TABLE OF RN1_CANCEL_SNAPSHOT,
      WA_RN1_CANCEL_SNAPSHOT TYPE RN1_CANCEL_SNAPSHOT,
      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: <RN1_CANCEL_SNAPSHOT> TYPE RN1_CANCEL_SNAPSHOT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1_CANCEL_SNAPSHOT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1_CANCEL_SNAPSHOT
  INTO TABLE IT_RN1_CANCEL_SNAPSHOT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1_CANCEL_SNAPSHOT
*  INTO TABLE @DATA(IT_RN1_CANCEL_SNAPSHOT2).
*--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_RN1_CANCEL_SNAPSHOT INDEX 1 INTO DATA(WA_RN1_CANCEL_SNAPSHOT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1_CANCEL_SNAPSHOT ASSIGNING <RN1_CANCEL_SNAPSHOT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1_CANCEL_SNAPSHOT>-KEY = 1.
<RN1_CANCEL_SNAPSHOT>-T_OBJECT = 1.
<RN1_CANCEL_SNAPSHOT>-T_CANCEL_DATA = 1.
<RN1_CANCEL_SNAPSHOT>-T_CANCEL_HIERARCHY = 1.
<RN1_CANCEL_SNAPSHOT>-T_EXCL_DATA = 1.

ENDLOOP.

LOOP AT IT_RN1_CANCEL_SNAPSHOT INTO WA_RN1_CANCEL_SNAPSHOT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1_CANCEL_SNAPSHOT-T_MARK, sy-vline,
  WA_RN1_CANCEL_SNAPSHOT-CANCEL_STATIC, sy-vline,
  WA_RN1_CANCEL_SNAPSHOT-ENVIRONMENT, sy-vline,
  WA_RN1_CANCEL_SNAPSHOT-CANCEL_FLAGS, sy-vline,
  WA_RN1_CANCEL_SNAPSHOT-CANCEL_APPMNT, sy-vline,
  WA_RN1_CANCEL_SNAPSHOT-CANCEL_APPMNT_X, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1_CANCEL_SNAPSHOT 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_RN1_CANCEL_SNAPSHOT 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_RN1_CANCEL_SNAPSHOT INTO WA_RN1_CANCEL_SNAPSHOT.


*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 RESP_EMPLOYEE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1_CANCEL_SNAPSHOT-RESP_EMPLOYEE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1_CANCEL_SNAPSHOT-RESP_EMPLOYEE.
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_RN1_CANCEL_SNAPSHOT_STR, 
KEY TYPE STRING,
T_OBJECT TYPE STRING,
T_CANCEL_DATA TYPE STRING,
T_CANCEL_HIERARCHY TYPE STRING,
T_EXCL_DATA TYPE STRING,
T_MARK TYPE STRING,
CANCEL_STATIC TYPE STRING,
ENVIRONMENT TYPE STRING,
CANCEL_FLAGS TYPE STRING,
CANCEL_APPMNT TYPE STRING,
CANCEL_APPMNT_X TYPE STRING,
CANCEL_SERVICE TYPE STRING,
CANCEL_SERVICE_X TYPE STRING,
CANCEL_PREREG TYPE STRING,
CANCEL_PREREG_X TYPE STRING,
CANCEL_NMATV TYPE STRING,
CANCEL_NMATV_X TYPE STRING,
CANCEL_REQUEST TYPE STRING,
CANCEL_REQUEST_X TYPE STRING,
CANCEL_SURGERY TYPE STRING,
CANCEL_SURGERY_X TYPE STRING,
CANCEL_PROV_PAT TYPE STRING,
CANCEL_PROV_PAT_X TYPE STRING,
CANCEL_MOVEMENT TYPE STRING,
CANCEL_MOVEMENT_X TYPE STRING,
CAN_SRV_WITH_APP TYPE STRING,
CAN_SRV_WITH_APP_X TYPE STRING,
CAN_DOC_WITH_REQ TYPE STRING,
CAN_DOC_WITH_REQ_X TYPE STRING,
CAN_FOL_MVMT TYPE STRING,
CAN_FOL_MVMT_X TYPE STRING,
CUT_DATA_FROM_MVMT TYPE STRING,
CUT_DATA_FROM_MVMT_X TYPE STRING,
CANCEL_CASE TYPE STRING,
CANCEL_CASE_X TYPE STRING,
CANCEL_COMPLICATION TYPE STRING,
CANCEL_COMPLICATION_X TYPE STRING,
CANCEL_TIMESTAMPS TYPE STRING,
CANCEL_TIMESTAMPS_X TYPE STRING,
CANCEL_CORDER TYPE STRING,
CANCEL_CORDER_X TYPE STRING,
CASE_REVISION TYPE STRING,
CASE_REVISION_X TYPE STRING,
CANCEL_CYSRVTPL TYPE STRING,
CANCEL_CYSRVTPL_X TYPE STRING,
CANCEL_REASON TYPE STRING,
RESP_EMPLOYEE TYPE STRING,
SET_DEFAULT_MARKS TYPE STRING,
USE_DEFAULT_CAUSE_CHANGE TYPE STRING,
CAUSE TYPE STRING,
CAUSEID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1_CANCEL_SNAPSHOT_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_RN1_CANCEL_SNAPSHOT_STR-KEY sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-T_OBJECT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-T_CANCEL_DATA sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-T_CANCEL_HIERARCHY sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-T_EXCL_DATA sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-T_MARK sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_STATIC sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-ENVIRONMENT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_FLAGS sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_APPMNT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_APPMNT_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_SERVICE sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_SERVICE_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_PREREG sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_PREREG_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_NMATV sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_NMATV_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_REQUEST sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_REQUEST_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_SURGERY sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_SURGERY_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_PROV_PAT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_PROV_PAT_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_MOVEMENT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_MOVEMENT_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_SRV_WITH_APP sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_SRV_WITH_APP_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_DOC_WITH_REQ sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_DOC_WITH_REQ_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_FOL_MVMT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAN_FOL_MVMT_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CUT_DATA_FROM_MVMT sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CUT_DATA_FROM_MVMT_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CASE sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CASE_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_COMPLICATION sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_COMPLICATION_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_TIMESTAMPS sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_TIMESTAMPS_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CORDER sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CORDER_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CASE_REVISION sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CASE_REVISION_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CYSRVTPL sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_CYSRVTPL_X sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CANCEL_REASON sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-RESP_EMPLOYEE sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-SET_DEFAULT_MARKS sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-USE_DEFAULT_CAUSE_CHANGE sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAUSE sy-vline 
WA_RN1_CANCEL_SNAPSHOT_STR-CAUSEID sy-vline      INTO ld_text SEPARATED BY SPACE.

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