ABAP Select data from SAP table RCNDAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCNDAT
*  INTO TABLE @DATA(IT_RCNDAT2).
*--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_RCNDAT INDEX 1 INTO DATA(WA_RCNDAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCNDAT>-BUDGET = 1.
<RCNDAT>-ACTUAL = 1.
<RCNDAT>-ESTIMATE = 1.
<RCNDAT>-PLANNED = 1.
<RCNDAT>-BUDGET_LOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCNDAT-BUDGET_HIGH, sy-vline,
  WA_RCNDAT-ACTUAL_LOW, sy-vline,
  WA_RCNDAT-ACTUAL_HIGH, sy-vline,
  WA_RCNDAT-ESTIM_LOW, sy-vline,
  WA_RCNDAT-ESTIM_HIGH, sy-vline,
  WA_RCNDAT-PLANNED_LOW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCNDAT 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_RCNDAT 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_RCNDAT INTO WA_RCNDAT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RCNDAT_STR, 
BUDGET TYPE STRING,
ACTUAL TYPE STRING,
ESTIMATE TYPE STRING,
PLANNED TYPE STRING,
BUDGET_LOW TYPE STRING,
BUDGET_HIGH TYPE STRING,
ACTUAL_LOW TYPE STRING,
ACTUAL_HIGH TYPE STRING,
ESTIM_LOW TYPE STRING,
ESTIM_HIGH TYPE STRING,
PLANNED_LOW TYPE STRING,
PLANNED_HIGH TYPE STRING,
STATUS_LOW TYPE STRING,
STATUS_HIGH TYPE STRING,
ACT_GT_BUDG TYPE STRING,
ACT_GT_PLAN TYPE STRING,
ESTIM_GT_BUDG TYPE STRING,
ESTIM_GT_PLAN TYPE STRING,
SCHED_B TYPE STRING,
SCHED_F TYPE STRING,
DISPLAY_SCHED TYPE STRING,
SCHED_PLAN TYPE STRING,
SCHED_BASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCNDAT_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_RCNDAT_STR-BUDGET sy-vline 
WA_RCNDAT_STR-ACTUAL sy-vline 
WA_RCNDAT_STR-ESTIMATE sy-vline 
WA_RCNDAT_STR-PLANNED sy-vline 
WA_RCNDAT_STR-BUDGET_LOW sy-vline 
WA_RCNDAT_STR-BUDGET_HIGH sy-vline 
WA_RCNDAT_STR-ACTUAL_LOW sy-vline 
WA_RCNDAT_STR-ACTUAL_HIGH sy-vline 
WA_RCNDAT_STR-ESTIM_LOW sy-vline 
WA_RCNDAT_STR-ESTIM_HIGH sy-vline 
WA_RCNDAT_STR-PLANNED_LOW sy-vline 
WA_RCNDAT_STR-PLANNED_HIGH sy-vline 
WA_RCNDAT_STR-STATUS_LOW sy-vline 
WA_RCNDAT_STR-STATUS_HIGH sy-vline 
WA_RCNDAT_STR-ACT_GT_BUDG sy-vline 
WA_RCNDAT_STR-ACT_GT_PLAN sy-vline 
WA_RCNDAT_STR-ESTIM_GT_BUDG sy-vline 
WA_RCNDAT_STR-ESTIM_GT_PLAN sy-vline 
WA_RCNDAT_STR-SCHED_B sy-vline 
WA_RCNDAT_STR-SCHED_F sy-vline 
WA_RCNDAT_STR-DISPLAY_SCHED sy-vline 
WA_RCNDAT_STR-SCHED_PLAN sy-vline 
WA_RCNDAT_STR-SCHED_BASE sy-vline      INTO ld_text SEPARATED BY SPACE.

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