ABAP Select data from SAP table RNCTX_SNAPSHOT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNCTX_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 RNCTX_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 RNCTX_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_RNCTX_SNAPSHOT TYPE STANDARD TABLE OF RNCTX_SNAPSHOT,
      WA_RNCTX_SNAPSHOT TYPE RNCTX_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: <RNCTX_SNAPSHOT> TYPE RNCTX_SNAPSHOT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNCTX_SNAPSHOT
*  INTO TABLE @DATA(IT_RNCTX_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_RNCTX_SNAPSHOT INDEX 1 INTO DATA(WA_RNCTX_SNAPSHOT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNCTX_SNAPSHOT>-KEY = 1.
<RNCTX_SNAPSHOT>-ACTIVE = 1.
<RNCTX_SNAPSHOT>-MODE = 1.
<RNCTX_SNAPSHOT>-NCTX = 1.
<RNCTX_SNAPSHOT>-MANDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNCTX_SNAPSHOT-CXID, sy-vline,
  WA_RNCTX_SNAPSHOT-CXTYP, sy-vline,
  WA_RNCTX_SNAPSHOT-STDEF, sy-vline,
  WA_RNCTX_SNAPSHOT-CXSTA, sy-vline,
  WA_RNCTX_SNAPSHOT-CXVALD, sy-vline,
  WA_RNCTX_SNAPSHOT-CXRSP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNCTX_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_RNCTX_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_RNCTX_SNAPSHOT INTO WA_RNCTX_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 CXRSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNCTX_SNAPSHOT-CXRSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNCTX_SNAPSHOT-CXRSP.
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_RNCTX_SNAPSHOT_STR, 
KEY TYPE STRING,
ACTIVE TYPE STRING,
MODE TYPE STRING,
NCTX TYPE STRING,
MANDT TYPE STRING,
CXID TYPE STRING,
CXTYP TYPE STRING,
STDEF TYPE STRING,
CXSTA TYPE STRING,
CXVALD TYPE STRING,
CXRSP TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
RELATIONS TYPE STRING,
SNAPKEY_OBJCENTRAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNCTX_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_RNCTX_SNAPSHOT_STR-KEY sy-vline 
WA_RNCTX_SNAPSHOT_STR-ACTIVE sy-vline 
WA_RNCTX_SNAPSHOT_STR-MODE sy-vline 
WA_RNCTX_SNAPSHOT_STR-NCTX sy-vline 
WA_RNCTX_SNAPSHOT_STR-MANDT sy-vline 
WA_RNCTX_SNAPSHOT_STR-CXID sy-vline 
WA_RNCTX_SNAPSHOT_STR-CXTYP sy-vline 
WA_RNCTX_SNAPSHOT_STR-STDEF sy-vline 
WA_RNCTX_SNAPSHOT_STR-CXSTA sy-vline 
WA_RNCTX_SNAPSHOT_STR-CXVALD sy-vline 
WA_RNCTX_SNAPSHOT_STR-CXRSP sy-vline 
WA_RNCTX_SNAPSHOT_STR-ERDAT sy-vline 
WA_RNCTX_SNAPSHOT_STR-ERUSR sy-vline 
WA_RNCTX_SNAPSHOT_STR-UPDAT sy-vline 
WA_RNCTX_SNAPSHOT_STR-UPUSR sy-vline 
WA_RNCTX_SNAPSHOT_STR-STORN sy-vline 
WA_RNCTX_SNAPSHOT_STR-STUSR sy-vline 
WA_RNCTX_SNAPSHOT_STR-STDAT sy-vline 
WA_RNCTX_SNAPSHOT_STR-RELATIONS sy-vline 
WA_RNCTX_SNAPSHOT_STR-SNAPKEY_OBJCENTRAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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