ABAP Select data from SAP table ICALENDARDATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICALENDARDATE
*  INTO TABLE @DATA(IT_ICALENDARDATE2).
*--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_ICALENDARDATE INDEX 1 INTO DATA(WA_ICALENDARDATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICALENDARDATE>-CALENDARDATE = 1.
<ICALENDARDATE>-CALENDARYEAR = 1.
<ICALENDARDATE>-CALENDARQUARTER = 1.
<ICALENDARDATE>-CALENDARMONTH = 1.
<ICALENDARDATE>-CALENDARWEEK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICALENDARDATE-CALENDARDAY, sy-vline,
  WA_ICALENDARDATE-YEARMONTH, sy-vline,
  WA_ICALENDARDATE-YEARQUARTER, sy-vline,
  WA_ICALENDARDATE-YEARWEEK, sy-vline,
  WA_ICALENDARDATE-WEEKDAY, sy-vline,
  WA_ICALENDARDATE-FIRSTDAYOFWEEKDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICALENDARDATE 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_ICALENDARDATE 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_ICALENDARDATE INTO WA_ICALENDARDATE.


*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_ICALENDARDATE_STR, 
CALENDARDATE TYPE STRING,
CALENDARYEAR TYPE STRING,
CALENDARQUARTER TYPE STRING,
CALENDARMONTH TYPE STRING,
CALENDARWEEK TYPE STRING,
CALENDARDAY TYPE STRING,
YEARMONTH TYPE STRING,
YEARQUARTER TYPE STRING,
YEARWEEK TYPE STRING,
WEEKDAY TYPE STRING,
FIRSTDAYOFWEEKDATE TYPE STRING,
FIRSTDAYOFMONTHDATE TYPE STRING,
CALENDARDAYOFYEAR TYPE STRING,
YEARDAY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICALENDARDATE_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_ICALENDARDATE_STR-CALENDARDATE sy-vline 
WA_ICALENDARDATE_STR-CALENDARYEAR sy-vline 
WA_ICALENDARDATE_STR-CALENDARQUARTER sy-vline 
WA_ICALENDARDATE_STR-CALENDARMONTH sy-vline 
WA_ICALENDARDATE_STR-CALENDARWEEK sy-vline 
WA_ICALENDARDATE_STR-CALENDARDAY sy-vline 
WA_ICALENDARDATE_STR-YEARMONTH sy-vline 
WA_ICALENDARDATE_STR-YEARQUARTER sy-vline 
WA_ICALENDARDATE_STR-YEARWEEK sy-vline 
WA_ICALENDARDATE_STR-WEEKDAY sy-vline 
WA_ICALENDARDATE_STR-FIRSTDAYOFWEEKDATE sy-vline 
WA_ICALENDARDATE_STR-FIRSTDAYOFMONTHDATE sy-vline 
WA_ICALENDARDATE_STR-CALENDARDAYOFYEAR sy-vline 
WA_ICALENDARDATE_STR-YEARDAY sy-vline      INTO ld_text SEPARATED BY SPACE.

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