ABAP Select data from SAP table ILASTMONTHDATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ILASTMONTHDATE
*  INTO TABLE @DATA(IT_ILASTMONTHDATE2).
*--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_ILASTMONTHDATE INDEX 1 INTO DATA(WA_ILASTMONTHDATE2).


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

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

ENDLOOP.

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

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


*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_ILASTMONTHDATE_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,
LASTMONTHSTARTDATEYEARMONTH TYPE STRING,
LASTMONTHSTARTDATE TYPE STRING,
LASTMONTHSTARTDATETIME TYPE STRING,
CALENDARDATEENDDATETIME TYPE STRING,
ABAPMINIMUMDATETIME TYPE STRING,
ABAPMAXIMUMDATETIME TYPE STRING,
ABAPMINIMUMDATE TYPE STRING,
ABAPMAXIMUMDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ILASTMONTHDATE_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_ILASTMONTHDATE_STR-CALENDARDATE sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARYEAR sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARQUARTER sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARMONTH sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARWEEK sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARDAY sy-vline 
WA_ILASTMONTHDATE_STR-YEARMONTH sy-vline 
WA_ILASTMONTHDATE_STR-YEARQUARTER sy-vline 
WA_ILASTMONTHDATE_STR-YEARWEEK sy-vline 
WA_ILASTMONTHDATE_STR-WEEKDAY sy-vline 
WA_ILASTMONTHDATE_STR-FIRSTDAYOFWEEKDATE sy-vline 
WA_ILASTMONTHDATE_STR-FIRSTDAYOFMONTHDATE sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARDAYOFYEAR sy-vline 
WA_ILASTMONTHDATE_STR-YEARDAY sy-vline 
WA_ILASTMONTHDATE_STR-LASTMONTHSTARTDATEYEARMONTH sy-vline 
WA_ILASTMONTHDATE_STR-LASTMONTHSTARTDATE sy-vline 
WA_ILASTMONTHDATE_STR-LASTMONTHSTARTDATETIME sy-vline 
WA_ILASTMONTHDATE_STR-CALENDARDATEENDDATETIME sy-vline 
WA_ILASTMONTHDATE_STR-ABAPMINIMUMDATETIME sy-vline 
WA_ILASTMONTHDATE_STR-ABAPMAXIMUMDATETIME sy-vline 
WA_ILASTMONTHDATE_STR-ABAPMINIMUMDATE sy-vline 
WA_ILASTMONTHDATE_STR-ABAPMAXIMUMDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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